CN115493178A - User heat exchange device of single-pipe heat supply system - Google Patents

User heat exchange device of single-pipe heat supply system Download PDF

Info

Publication number
CN115493178A
CN115493178A CN202211256758.2A CN202211256758A CN115493178A CN 115493178 A CN115493178 A CN 115493178A CN 202211256758 A CN202211256758 A CN 202211256758A CN 115493178 A CN115493178 A CN 115493178A
Authority
CN
China
Prior art keywords
water
pipe
distribution
outlet end
inlet end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211256758.2A
Other languages
Chinese (zh)
Inventor
刘雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202211256758.2A priority Critical patent/CN115493178A/en
Publication of CN115493178A publication Critical patent/CN115493178A/en
Priority to CN202322543853.7U priority patent/CN221146617U/en
Priority to CN202311198491.0A priority patent/CN117232035A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/12—Heat pump
    • F24D2200/123—Compression type heat pumps

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)

Abstract

The invention discloses a user heat exchange device of a single-pipe heat supply system, which comprises a distribution water supply pipe, a distribution water return pipe, a circulation pipe, a confluence three-way flow regulating valve and at least one water source heat pump, wherein the distribution water return pipe is connected with the circulation pipe; the inlet end of the distribution water supply pipe is connected with the circulating pipe; the outlet end of the distribution water return pipe is also connected with the circulating pipe; the water source heat pump is arranged on a water path between the outlet end of the distribution water supply pipe and the inlet end of the distribution water return pipe in series, the outlet end of the distribution water supply pipe is connected with the water side inlet end of the evaporator of the water source heat pump, and the inlet end of the distribution water return pipe is connected with the water side outlet end of the evaporator of the water source heat pump; the direct-current inlet of the confluence three-way flow regulating valve is connected with the circulating pipe through the inlet end of the distribution water supply pipe, and the bypass inlet of the confluence three-way flow regulating valve is connected with the distribution water return pipe through the bypass pipe; the method is characterized in that: the single-pipe heat supply system can realize large-temperature-difference heat supply, avoid hydraulic imbalance among heat users, reduce the investment of an outdoor pipe network and reduce the operation and debugging workload of the heat supply system.

Description

User heat exchange device of single-pipe heat supply system
Technical Field
The invention relates to a user heat exchange device of a single-pipe heat supply system, and belongs to the technical field of central heating.
Background
With the development of society and the improvement of living standard of people, the application of a central heating system to heating buildings or building districts in winter in cities is more and more extensive, and the currently commonly used central heating system is a double-pipe hot water heating system, as shown in fig. 9; as can be seen from fig. 9: the outlet end of the heat source 1 of the double-pipe hot water heating system is connected with a water supply pipe 40; the inlet end of the heat source 1 is connected with a water return pipe 30; all the hot users 3 are connected in parallel between the water supply pipe 40 and the water return pipe 30; namely: the inlet end of the user heat exchange device 50 of the hot user 3 is connected with the water supply pipe 40 through the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water supply pipe 6 in sequence; the outlet end of the user heat exchange device 50 of the hot user 3 is connected with the water return pipe 30 through the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 in sequence. Because each heat user 3 in the double-pipe hot water heating system is in parallel connection, when the flow of any one heat user 3 in the double-pipe hot water heating system is changed in the operation process, the flow of other heat users 3 is affected. When no dynamic regulating valve is arranged in the user heat exchange device 50, the flow of other heat users 3 deviates from the design value, namely, hydraulic imbalance is generated, so that the heat supply of some heat users 3 is insufficient, the heat supply of some heat users 3 is excessive, the room temperature of each heat user cannot meet the requirement, and the heat imbalance is generated when the room temperature is higher. On one hand, the heat supply quality is influenced by the heat imbalance; on the other hand, the operation energy consumption of the heating system is increased, and energy is not saved.
When the user heat exchange device 50 of each heat user 3 of the double-pipe hot water heating system is provided with the regulating valve, although the influence on the flow of other heat users 3 can be weakened or eliminated by the regulating function of the regulating valve when the flow of any heat user 3 in the double-pipe hot water heating system is changed, the regulating valve still has mutual influence in the regulating process because each heat user 3 is in parallel connection; therefore, whether the regulating valve can correctly play a role in the actual operation of the double-pipe hot water heating system depends on the correct design of designers and the fine installation and debugging of installers and operators.
In addition, aiming at the debugging of the regulating valve, the regulating valve is not debugged once and for all, and in any new heating season, when a new heat user is added to the double-pipe hot water heating system, or an old heat user changes the operation parameters, or a pressure water pump is added, operation and maintenance personnel must debug the regulating valve of the double-pipe hot water heating system again; therefore, the operation and maintenance of the dual-pipe hot water heating system become heavy and complicated no matter whether the regulating and controlling valves are arranged in the user heat exchange devices 50 of the heat users 3 or not, and the effect is difficult to meet the requirements due to the mutual influence generated by the parallel connection relationship among the heat users 3.
In addition, the double-pipe hot water heating system has disadvantages in that: the return water temperature in the return pipe 30 is difficult to be greatly reduced, so that the temperature difference between the water supply temperature in the water supply pipe 40 and the return water temperature in the return pipe 30 is small, and the heat conveying capacity of the water supply pipe 40 and the return pipe 30 is weak, so that the pipe diameters of the water supply pipe 40 and the return pipe 30 are larger under the condition of conveying the same heat, on one hand, the initial investment is increased, and on the other hand, when the water is laid in an urban block, a larger laying pipe position is required, and the difficulty in laying, construction and installation is caused. As can be seen from fig. 9, the return water coming out of the hot user 3 flows back to the return pipe 30 via the distribution return pipe 7; when the water supplied into the heat consumer 3 from the distribution water supply pipe 6 directly enters each indoor heat dissipation terminal 20 of the heat consumer 3 to supply heat to a room, the mixed water temperature at the outlet of each indoor heat dissipation terminal 20 is the return water temperature in the distribution return pipe 7. When the user heat exchange device 50 is provided with a water-water type heat exchanger, the water supply entering the heat user 3 from the distribution water supply pipe 6 is subjected to indirect heat exchange with the return water of the indoor heat dissipation tail end 20 of the heat user 3 through the water-water type heat exchanger, and then when the room is heated, the temperature of the outlet water at the high-temperature side of the water-water type heat exchanger is the return water temperature in the distribution return water pipe 7; because of the heat transfer temperature difference in the water-water type heat exchanger, the water temperature at the outlet of the high-temperature side of the water-water type heat exchanger is higher than the mixed water temperature at the outlet of each indoor heat dissipation tail end 20; so that the return water temperature in the distribution return pipe 7 is higher.
The water supply and return temperature of each indoor heat dissipation terminal 20 depends on the selected room terminal type and the design scheme of a designer, and the most common indoor heat dissipation terminals 20 are radiators, floor heating and fan coils at present; in the central heating system of northern cities in China, the return water temperature in most return pipes 30 is about 50 ℃, and large-temperature-difference heating cannot be realized.
Disclosure of Invention
The invention aims to provide a user heat exchange device of a single-pipe heat supply system, which can overcome hydraulic imbalance of a double-pipe hot water heat supply system, avoid mutual influence between water flow distribution of each heat user, improve heat supply quality and reduce operation debugging workload of the heat supply system; meanwhile, the heat supply system can realize large temperature difference heat supply, heat sources of the heat supply system to heat users and heat supply pipeline diameters among the heat users are reduced, and the floor area of the outdoor heat supply pipeline during laying is reduced, so that the manufacturing cost of an outdoor pipe network is reduced.
In order to overcome the problems of the prior art, the technical scheme for solving the technical problems is as follows:
1. the utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), at least one water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a resistance valve (16); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of the evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the resistance valve (16) is arranged on the circulating pipe (4) between the inlet end of the distribution water supply pipe (6) and the outlet end of the distribution water return pipe (7).
2. The utility model provides a single tube heating system's user heat transfer device, is including distribution delivery pipe (6), distribution wet return (7), an at least water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a flow regulating valve; the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of the evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the flow regulating valve is arranged on the distribution water supply pipe (6) or the distribution water return pipe (7) and is used for controlling the actual hot water flow at the outlet end of the distribution water supply pipe (6) to be a set expected value.
3. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), at least one water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a differential pressure sensor; the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of an evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the high-pressure measuring point of the differential pressure sensor is connected with a distribution water supply pipe (6) at the water side inlet end of an evaporator (10) of a water source heat pump (9); the low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe (7) at the water side outlet end of an evaporator (10) of a water source heat pump (9).
4. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), at least one water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a preheater (19); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of an evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the inlet end of the high-temperature side of the preheater (19) is connected with the circulating pipe (4) through the inlet end of a distribution water supply pipe (6), and the outlet end of the high-temperature side of the preheater (19) is connected with the inlet end of the water side of the evaporator (10) of the water source heat pump (9) through the outlet end of the distribution water supply pipe (6); the outlet end of the low-temperature side of the preheater (19) is connected with the inlet end of the water side of a condenser (11) of the water source heat pump (9).
5. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a confluence three-way flow regulating valve (17); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the direct current inlet of the confluence three-way flow regulating valve (17) is connected with the circulating pipe (4) through the inlet end of the distribution water supply pipe (6), and the bypass current inlet of the confluence three-way flow regulating valve (17) is connected with the distribution water return pipe (7) through the outlet end of the bypass pipe (23) and the inlet end of the bypass pipe (23) in sequence; the outlet of the confluence three-way flow regulating valve (17) is connected with the outlet end of the distribution water supply pipe (6).
6. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a shunt three-way flow regulating valve (18); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the direct-flow outlet of the shunt three-way flow regulating valve (18) is connected with the circulating pipe (4) through the outlet end of the distribution water return pipe (7), and the bypass outlet of the shunt three-way flow regulating valve (18) is connected with the distribution water supply pipe (6) through the inlet end of the bypass pipe (23) and the outlet end of the bypass pipe (23) in sequence; the inlet of the flow dividing three-way flow regulating valve (18) is connected with the inlet end of the distribution water return pipe (7).
7. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), at least one water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a confluence three-way flow regulating valve (17); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of an evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the direct current inlet of the confluence three-way flow regulating valve (17) is connected with the circulating pipe (4) through the inlet end of the distribution water supply pipe (6), the bypass inlet of the confluence three-way flow regulating valve (17) is connected with the distribution water return pipe (7) through the outlet end of the bypass pipe (23) and the inlet end of the bypass pipe (23) in sequence, and the outlet of the confluence three-way flow regulating valve (17) is connected with the water side inlet end of the evaporator (10) of the water source heat pump (9) through the outlet end of the distribution water supply pipe (6).
8. The utility model provides a single tube heating system's user heat transfer device, is including distribution delivery pipe (6), distribution wet return (7), an at least water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a flow regulating valve (18) of a shunting tee joint; the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of an evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the direct-current outlet of the shunt three-way flow regulating valve (18) is connected with the circulating pipe (4) through the outlet end of the distribution water return pipe (7), the bypass outlet of the shunt three-way flow regulating valve (18) is connected with the distribution water supply pipe (6) through the inlet end of the bypass pipe (23) and the outlet end of the bypass pipe (23) in sequence, and the inlet of the shunt three-way flow regulating valve (18) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9) through the inlet end of the distribution water return pipe (7).
Compared with the prior art, the invention has the beneficial effects that:
1. the hydraulic imbalance of a double-pipe hot water heating system can be overcome, and the mutual influence of water flow distribution of each heat user is avoided;
2. the operation debugging workload of the single-pipe heat supply system can be reduced;
3. the single-pipe heat supply system can realize large-temperature-difference heat supply, reduce the heat source to heat users and the pipe diameter of a heat supply pipeline between the heat users, and reduce the cost of an outdoor pipe network;
4. the invention is suitable for industrial and civil large-temperature-difference single-tube heating systems, and is particularly suitable for occasions of waste heat recovery and renewable energy source heating.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of embodiment 2 of the present invention;
FIG. 3 is a schematic structural view of embodiment 3 of the present invention;
FIG. 4 is a schematic structural view of embodiment 4 of the present invention;
FIG. 5 is a schematic structural view of embodiment 5 of the present invention;
FIG. 6 is a schematic structural view of embodiment 6 of the present invention;
FIG. 7 is a schematic structural view of embodiment 7 of the present invention;
FIG. 8 is a schematic structural view of example 8 of the present invention;
fig. 9 is a schematic diagram of a prior art structure.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the present embodiment is a single-pipe heating system, which is used in situations where there is a heating demand. The whole system comprises the following components: heat source station 1, circulation pump 2, 4 heat consumers 3 (shown in figure 1 as a, b, c and d), circulation pipe 4 and return water temperature sensor 22. The connection mode is as follows: the heat source station 1 is connected with the inlet end B of the heat source station 1 and returns to the heat source station 1 sequentially through the outlet end A of the heat source station 1, the inlet end of the circulating pipe 4, the heat consumer 3 shown in a picture a in a picture 1, the heat consumer 3 shown in a picture B in a picture 1, the heat consumer 3 shown in a picture c in a picture 1, the heat consumer 3 shown in a picture d in a picture 1, the suction end of the circulating pump 2, the extrusion end of the circulating pump 2 and the outlet end of the circulating pipe 4.
The heat source station 1 can be any one or more of a boiler, a heat pump unit, a waste heat recovery device, an urban heat supply network heat exchange station, a geothermal well heat exchange station, a heat accumulator and the like. The thermal users 3 are heating systems of a building, or heating systems of different areas of a building, for example: the high-rise building heating system comprises a high-rise heating system and a low-rise heating system. The indoor heat sink end 20 in the heat consumer 3 may be any one of a radiator, a floor heater, or a fan coil, etc. The circulation pump 2 is a variable frequency pump.
The specific composition of the user heat exchange devices 50 for 4 hot users and the connection relationship in the system in this embodiment are as follows.
1) The hot user 3 shown in the diagram a in fig. 1
As shown in fig. 1, a heat consumer 3, a circulation pipe 4 is in direct connection with its indoor heat dissipation end 20; namely: the hot water in the circulation pipe 4 directly enters the indoor heat dissipation terminal 20 to heat the heat consumer 3. The user heat exchange device 50 consists of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7 and a resistance valve 16; the connection mode is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4, the outlet end of the distribution water return pipe 7 is connected with the circulating pipe 4, and a resistance valve 16 is arranged on the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7.
As shown in fig. 1 a, the user heat exchanging device 50 is connected to the inlet end of the indoor heat radiating terminal 20 through the outlet end of the distribution water supply pipe 6 and connected to the outlet end of the indoor heat radiating terminal 20 through the inlet end of the distribution water return pipe 7.
The resistance valve 16 is typically a pressure difference control valve for regulating the actual pressure difference between the distributed water supply pipe 6 and the distributed water return pipe 7 of the user heat exchange device 50 to a set desired value. In the working process, when the flow of the hot water required by the indoor heat dissipation tail end 20 is reduced, the redundant flow of the hot water is bypassed through the resistance valve 16, the variable-flow operation of the indoor heat dissipation tail end 20 is ensured, and the flow distribution of other heat users 3 is not influenced; similarly, when the hot water flow required by the indoor heat dissipation end 20 becomes larger, the resistance valve 16 is automatically closed, so as to reduce the hot water flow bypassed by the resistance valve 16, and the flow distribution of other heat consumers 3 is not affected. The above method of controlling the flow of hot water into the indoor heat sink 20 using the resistance valve 16 is applicable to all solutions of the present invention where the heat consumer 3 is directly connected.
2) The hot user 3 shown in the diagram b in fig. 1
As shown in the diagram b of fig. 1, the circulation pipe 4 is also in direct connection with its indoor heat dissipation end 20 of the heat consumer 3. The user heat exchange device 50 consists of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7 and a distribution water pump 5; the connection mode is as follows: the inlet end of a distribution water supply pipe 6 is connected with the circulating pipe 4, the outlet end of a distribution water return pipe 7 is connected with the circulating pipe 4, and a distribution water pump 5 is arranged on the distribution water supply pipe 6; and the suction end of the distribution water pump 5 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6. As shown in fig. 1 b, the user heat exchanger 50 is connected to the inlet of the indoor heat dissipation end 20 through the outlet of the distribution water supply pipe 6 and the inlet of the distribution water return pipe 7.
In the operation process, the distribution water pump 5 is used for sucking a part of hot water from the circulating pipe 4 and sending the hot water into the indoor heat dissipation tail end 20 for heating rooms, after the hot water is cooled by heat dissipation, the hot water is discharged into the downstream circulating pipe 4 through the outlet end of the distribution water return pipe 7 and is mixed with another part of hot water which does not enter the hot user for heating and still flows into the downstream along the circulating pipe 4; the two are mixed and continue to flow along the circulation loop 4 to the next hot user 3. The distribution water pump 5 can be a fixed frequency pump or a variable frequency pump.
When the distribution water pump 5 is a fixed-frequency pump and the heat consumer 3 is operated at a fixed flow rate, a flow rate regulating valve can be arranged on the distribution water supply pipe 6 or the distribution water return pipe 7 to control the actual hot water flow rate at the outlet end of the distribution water supply pipe 6 to be a set expected value; i.e. to ensure that the flow of hot water into the hot user 3 is constant.
When the heat consumer 3 is in variable flow operation and the distribution water pump 5 is a variable frequency pump, a differential pressure sensor can be arranged between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and in the operation process, the differential pressure sensor is used for measuring the actual differential pressure between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, comparing the actual differential pressure with a preset differential pressure expected value, and regulating and controlling the operation frequency of the distribution water pump 5 according to the comparison result so that the actual differential pressure between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7 is equal to the preset differential pressure expected value, thereby realizing the regulation and control of the hot water flow of the heat consumer 3.
The hot water flow control method for the indoor heat dissipation tail end 20 just changes the hot water flow distribution between the indoor heat dissipation tail end 20 of the heat consumer 3 and the circulating pipe 4, and does not affect the hot water flow of other heat consumers 3.
In addition, the distribution water pump 5 can also be arranged on the distribution water return pipe 7 of the hot user; at this time, the suction end of the distribution water pump 5 is connected with the outlet end of the indoor heat dissipation tail end 20 through the inlet end of the distribution water return pipe 7, and the extrusion end of the distribution water pump 5 is connected with the circulating pipe 4 through the outlet end of the distribution water return pipe 7. In the working process, the hot water flow regulating method for the indoor heat dissipation tail end 20 and the control method for the distribution water pump 5 are the same as those when the distribution water pump 5 is installed on the distribution water supply pipe 6.
The above method of controlling the flow of hot water into the indoor heat dissipation terminal 20 by using the distribution water pump 5 and the distribution water pump 5 in combination with the flow regulating valve is applicable to all the schemes of the present invention in which the heat consumers 3 are directly connected.
3) The hot user 3 shown in the diagram c in fig. 1
As shown in the diagram c of fig. 1, the circulation pipe 4 is indirectly connected to the indoor heat radiation terminal 20 of the heat consumer 3; namely: the hot water in the circulation pipe 4 does not directly enter the indoor heat dissipation terminal 20 to heat the heat consumer 3. The user heat exchange device 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a distribution water pump 5, a water source heat pump 9 and an indoor water pump 21. The water source heat pump 9 is basically composed of: an evaporator 10, a condenser 11, a compressor 12, and a throttle valve 13; the connection mode is as follows: the outlet of the compressor 12 is connected to the inlet of the compressor 12 sequentially through the refrigerant-side inlet of the condenser 11, the refrigerant-side outlet of the condenser 11, the throttle valve 13, the refrigerant-side inlet of the evaporator 10, and the refrigerant-side outlet of the evaporator 10.
The connection mode of the user heat exchange device 50 of the heat user 3 is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution return pipe 7 is also connected with the circulating pipe 4. A water source heat pump 9 is connected in series on the water path between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and the concrete connection mode is as follows: the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the water side of an evaporator 10 of a water source heat pump 9, and the outlet end of the water side of the evaporator 10 of the water source heat pump 9 is connected with the inlet end of a distribution water return pipe 7. A distribution water pump 5 is arranged on the distribution water supply pipe 6; the suction end of the distribution water pump 5 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6, and the extrusion end of the distribution water pump 5 is connected with the water side inlet end of the evaporator 10 of the water source heat pump 9 through the outlet end of the distribution water supply pipe 6; the pressure outlet end of the indoor water pump 21 is connected with the water side inlet end of the condenser 11 of the water source heat pump 9.
The indoor system of the hot user 3 consists of an indoor heat dissipation tail end 20, an indoor water pump 21, an indoor water supply pipe 24, an indoor water return pipe 25 and a condenser 11 of a water source heat pump 9. The connection mode is as follows: the water side outlet end of the condenser 11 of the water source heat pump 9 is connected with the water side inlet end of the condenser 11 of the water source heat pump 9 sequentially through an indoor water supply pipe 24, an indoor heat dissipation tail end 20 inlet end, an indoor heat dissipation tail end 20 outlet end, an indoor water return pipe 25, an indoor water pump 21 suction end and an indoor water pump 21 pressure-out end.
In the working process, the user heat exchange device 50 extracts heat from the hot water in the circulating pipe 4 through the evaporator 10 of the water source heat pump 9, and then heats the indoor system return water through the condenser 11 of the water source heat pump 9 of the user heat exchange device 50, and the water temperature reaches the indoor system water supply requirement and then is sent to the indoor heat dissipation tail end 20 of the heat user 3 to supply heat for the user.
In practical application, in order to ensure that the water source heat pump 9 in the heat exchange device 50 of the user works normally, the minimum flow requirement is generally set for the hot water flow passing through the evaporator 10, and in order to ensure the efficient operation of the water source heat pump 9, a manufacturer usually gives a recommended hot water flow, so that the hot water flow passing through the evaporator 10 is kept stable in the operation process and within the recommended hot water flow range; because the flow rate of the hot water entering the evaporator 10 exceeds the recommended hot water flow rate of a manufacturer, the hot water flow rate is mostly not good, the transitional scouring of the heat exchange tube bundle by the water flow in the evaporator 10 can be caused, and the service life of a unit is influenced; therefore, in the operation process, when the flow of the hot water from the upstream circulating pipe 4 is larger than the flow of the hot water required by the evaporator 10, the distribution water pump 5 is used for absorbing a part of the hot water from the circulating pipe 4, sending the part of the hot water into the evaporator 10 of the water source heat pump 9 through the distribution water supply pipe 6, carrying out indirect heat exchange with the refrigerant, and discharging the hot water into the downstream circulating pipe 4 after the hot water releases heat and cools, and then sequentially passing through the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7; is mixed with another part of hot water which is not radiated in the evaporator 10 of the water source heat pump 9 and still flows into the downstream along the circulating pipe 4; the two portions of hot water are mixed and then continue to flow along the circulation loop 4 to the next hot user 3.
In the operation process, when the flow of the hot water from the upstream circulating pipe 4 is smaller than the flow of the hot water required by the evaporator 10, a part of the hot water discharged into the downstream circulating pipe 4 from the outlet end of the distribution water return pipe 7 returns to the inlet end of the distribution water supply pipe 6, is mixed with the hot water from the upstream circulating pipe 4, and then sequentially passes through the inlet end of the distribution water supply pipe 6, the suction end of the distribution water pump 5, the extrusion end of the distribution water pump 5, the outlet end of the distribution water supply pipe 6 and the water side inlet end of the evaporator 10 to enter the evaporator 10 to exchange heat with the refrigerant; after the hot water emits heat and is cooled, the hot water is discharged into a downstream circulating pipe 4 through a water side outlet end of an evaporator 10, an inlet end of a distribution water return pipe 7 and an outlet end of the distribution water return pipe 7 in sequence and is divided into two parts; a part of the water returns to the inlet end of the distribution water supply pipe 6 through the circulating pipe 4 between the outlet end of the distribution water return pipe 7 of the user heat exchange device 50 and the inlet end of the distribution water supply pipe 6; another part continues along the circulation pipe 4 downstream of the outlet end of the distribution return pipe 7 to the next heat consumer 3.
In the working process, a part of hot water extracted from a circulating pipe 4 by a water distribution pump 5 is used as a low-temperature heat source by a water source heat pump 9 of the user heat exchange device 50, in an evaporator 10 of the water source heat pump 9, a low-temperature and low-pressure refrigerant gas-liquid two-phase mixture is subjected to indirect heat exchange with the part of hot water, the refrigerant is gasified into low-temperature and low-pressure refrigerant gas after absorbing the heat of the hot water, then the low-temperature and low-pressure refrigerant gas enters a compressor 12 and is compressed into high-temperature and high-pressure refrigerant superheated gas, the refrigerant superheated gas enters a condenser 11 to heat indoor system backwater, so that the temperature of the indoor system backwater reaches the water supply temperature requirement, and then the indoor system backwater is sent to an indoor heat dissipation tail end 20 to supply heat for a user; in the condenser 11, the refrigerant superheated gas releases heat and is condensed into liquid, and then enters the throttle valve 13, and is throttled into a low-temperature and low-pressure refrigerant gas-liquid two-phase mixture, and then enters the evaporator 10, so that a heat pump cycle is completed.
In practical application, the distribution water pump 5 can be a fixed-frequency pump or a variable-frequency pump; the method for controlling the flow of hot water entering the evaporator 10 of the water source heat pump 9 of the user heat exchange device 50 to be a desired value during operation is as follows.
(i) When the distribution water pump 5 is a fixed-frequency pump, in order to ensure that the flow of hot water entering the evaporator 10 is stable, a flow regulating valve can be arranged on the distribution water supply pipe 6 or the distribution water return pipe 7 to control the actual flow of hot water at the outlet end of the distribution water supply pipe 6 to be a set expected value; i.e. to ensure that the flow of hot water into the evaporator 10 is at a set desired value.
(ii) When the distribution water pump 5 is a variable frequency pump, in order to ensure the stable flow of the hot water entering the evaporator 10 of the water source heat pump 9 during operation, a pressure difference sensor may be disposed between the outlet end of the distribution water supply pipe 6 of the user heat exchange device 50 and the inlet end of the distribution water return pipe 7 thereof, and during operation, the pressure difference sensor is used to measure the actual pressure difference between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7 (i.e. the actual pressure difference between the water side inlet end of the evaporator 10 of the water source heat pump 9 and the water side outlet end of the evaporator 10 thereof), compare the actual pressure difference with a preset expected pressure difference value, and regulate and control the operation frequency of the distribution water pump 5 according to the comparison result, so that the actual pressure difference between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7 is equal to the preset expected pressure difference value, thereby maintaining the stable flow of the hot water entering the evaporator 10 of the water source heat pump 9. At this time, the differential pressure sensor is connected in the following manner: a high-pressure measuring point of the pressure difference controller is connected with a distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the extrusion end of the distribution water pump 5; and a low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe 7 at the inlet end of the distribution water return pipe 7.
In addition, the distribution water pump 5 of the user heat exchange device 50 can also be arranged on the distribution water return pipe 7; at this time, the suction end of the distribution water pump 5 is connected with the water side outlet end of the evaporator 10 through the inlet end of the distribution water return pipe 7, and the extrusion end of the distribution water pump 5 is connected with the circulation pipe 4 through the outlet end of the distribution water return pipe 7. At this time, in the working process, the regulation and control method for ensuring the stability of the hot water flow of the evaporator 10 of the water source heat pump 9 is the same as that when the distribution water pump 5 is installed on the distribution water supply pipe 6. When the operating frequency of the distribution water pump 5 is controlled by the differential pressure sensor, the connection mode of the differential pressure sensor of the user heat exchange device 50 is as follows: a high-pressure measuring point of the pressure difference controller is connected with a distribution water supply pipe 6 at the outlet end of the distribution water supply pipe 6; and a low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the suction end of the distribution water pump 5.
The regulation and control method for ensuring the stability of the hot water flow of the evaporator 10 of the water source heat pump 9 by utilizing the distribution water pump 5 and combining the distribution water pump 5 with the flow regulating valve is applicable to all schemes of the invention using the distribution water pump 5 and the water source heat pump 9.
In practical application, the indoor water pump 21 can also be arranged on the outlet pipeline of the water side of the condenser 11 of the water source heat pump 9; at this time, the suction side of the indoor water pump 21 is connected to the water side outlet end of the condenser 11, and the discharge side of the indoor water pump 21 is connected to the inlet side of the indoor heat radiating terminal 20 through the indoor water supply pipe 24. In operation, the temperature of the water supply of the indoor system is controlled by the water source heat pump 9.
Since the heat consumer 3 is indirectly connected, in order to supplement water and maintain the pressure for the indoor system of the heat consumer 3, the following scheme can be adopted, and hot water in the circulating pipe 4 is utilized to supplement water and maintain the pressure for the indoor system. i) A water replenishing pump is additionally arranged in the user heat exchange device 50, the pressure outlet end of the water replenishing pump is connected with the water side outlet end or inlet end pipeline of the condenser 11, and the suction end of the water replenishing pump is connected with any one pipeline of a distribution water supply pipe 6, a distribution water return pipe 7 or a circulating pipe 4. ii) a pressure regulating valve is additionally arranged in the user heat exchange device 50, the outlet end of the pressure regulating valve is connected with the outlet end or the inlet end of the water side of the condenser 11, and the inlet end of the pressure regulating valve is connected with any one of the distribution water supply pipe 6, the distribution water return pipe 7 or the circulating pipe 4. The constant pressure water replenishing method of the indoor system is suitable for all the user heat exchange devices 50 of the heat users 3 adopting indirect connection.
4) The hot user 3 shown in the diagram d in fig. 1
As shown in the diagram d of fig. 1, the heat consumer 3 is close to the outlet end of the circulation pipe 4, and the circulation pipe 4 is indirectly connected to the indoor heat dissipation end 20 of the heat consumer 3. The user heat exchange device 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a resistance valve 16, a water source heat pump 9 and an indoor water pump 21. The basic composition, connection and working principle of the water source heat pump 9 in the user heat exchange device 50 are the same as those of the user heat exchange device 50 shown in fig. c in fig. 1.
The connection mode of the user heat exchange device 50 of the heat user 3 is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water return pipe 7 is also connected with the circulating pipe 4; a water source heat pump 9 is connected in series on the water path between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and the concrete connection mode is as follows: the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the water side of an evaporator 10 of a water source heat pump 9, and the outlet end of the water side of the evaporator 10 of the water source heat pump 9 is connected with the inlet end of a distribution water return pipe 7; a resistance valve 16 is arranged on the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the pressure outlet end of the indoor water pump 21 is connected with the water side inlet end of the condenser 11 of the water source heat pump 9.
The basic composition and connection relationship of the indoor system of the hot user 3 are the same as those of the hot user 3 shown in the diagram c in fig. 1. In the working process, the user heat exchange device 50 extracts heat from hot water in the circulating pipe 4 through the evaporator 10 of the water source heat pump 9, then heats indoor system backwater through the condenser 11 of the water source heat pump 9, and sends the water to the indoor heat dissipation tail end 20 for heating after the water temperature meets the water supply requirement of the indoor system. The resistance valve 16 is generally a differential pressure control valve or a self-operated differential pressure control valve, and is used for regulating and controlling the actual differential pressure between the distribution water supply pipe 6 and the distribution water return pipe 7 to be a set expected value; the flow of hot water into the evaporator 10 is kept constant. The control method using the resistance valve 16 to ensure the flow stability of the hot water entering the evaporator 10 is applicable to all the solutions of the present invention using the water source heat pump 9.
In the operation process, under the regulation and control of the resistance valve 16, a part of hot water in the circulating pipe 4 enters the evaporator 10 of the water source heat pump 9 to carry out indirect heat exchange with a refrigerant, and the hot water is discharged into the downstream circulating pipe 4 after being cooled through the heat emitted by the hot water and then sequentially passes through the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7; mixing with another part of the hot water which is not discharged into the evaporator 10 of the user heat exchange device 50 and flows downstream along the circulating pipe 4 through the resistance valve 16; and then continuously enters the circulating pump 2 along the circulating pipe 4 to be pressurized and then returns to the heat source station 1.
When the single-pipe heating system operates in winter, heating is carried out on a heating user 3 shown in a figure a, a figure b, a figure c and a figure d in the figure 1 in sequence through a circulating pipe 4; the large temperature difference operation can be realized, and meanwhile, the mutual influence between the water flow distribution of the heat consumer is avoided.
The workflow of the system shown in fig. 1 is: after the hot water comes out from the outlet end A of the heat source station 1, the hot water is conveyed downstream along the circulating pipe 4 through the inlet end of the circulating pipe 4 and sequentially supplies heat to 4 heat users 3; the first hot user 3 is the hot user shown in fig. 1 a, under the control of the resistance valve 16 of the hot user 3, a part of hot water conveyed by the circulation pipe 4 passes through the inlet end of the distribution water supply pipe 6, the outlet end of the distribution water supply pipe 6 and the inlet end of the indoor heat dissipation terminal 20 of the hot user 3 in sequence, enters the indoor heat dissipation terminal 20 to supply heat to the user, and after the temperature of the hot water is reduced, the hot water passes through the outlet end of the indoor heat dissipation terminal 20, the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 in sequence and returns to the circulation pipe 4 at the downstream of the hot user 3; mixing with another portion of the hot water not entering the heating user for heating and flowing along the circulation pipe 4 downstream of the heating user 3 through the resistance valve 16; the two portions of hot water mix and continue to flow along the circulation loop 4 to the second heat consumer 3, i.e. the heat consumer 3 shown in the diagram b of fig. 1.
When the mixed hot water flows along the circulation pipe 4 to the heat consumer shown in fig. 1 b, the flow of the hot water in the circulation pipe 4 is divided into two parts; a part of hot water sequentially passes through the inlet end of a distribution water supply pipe 6, the suction end of a distribution water pump 5, the extrusion end of the distribution water pump 5, the outlet end of the distribution water supply pipe 6 and the inlet end of an indoor heat dissipation tail end 20 of the heat consumer 3, enters the indoor heat dissipation tail end 20 to supply heat for the heat consumer, and after the temperature of the hot water is reduced, the hot water sequentially passes through the outlet end of the indoor heat dissipation tail end 20, the inlet end of a distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 and returns to a circulating pipe 4 at the downstream of the heat consumer 3; mixing with another portion of hot water not entering the heating user 3 for indoor heating and still flowing downstream of the heating user 3 along the circulation pipe 4; the two portions of hot water mix and continue to flow along the circulation loop 4 to the third heat consumer 3, i.e. the heat consumer shown in figure 1, diagram c.
When the mixed hot water flows along the circulation pipe 4 to the heat consumer 3 shown in the diagram c of fig. 1 and the flow rate of the hot water in the circulation pipe 4 is larger than the flow rate of the hot water requested by the evaporator 10 of the heat consumer 3, the hot water is divided into two parts; part of hot water sequentially passes through the inlet end of a distribution water supply pipe 6, the suction end of a distribution water pump 5, the pressure outlet end of the distribution water pump 5, the outlet end of the distribution water supply pipe 6 and the water side inlet end of an evaporator 10 of a water source heat pump 9 of the heat consumer 3 and enters the evaporator 10 to perform indirect heat exchange with a refrigerant; after the temperature of the heat released by the hot water is reduced, the hot water sequentially passes through the water side outlet end of the evaporator 10, the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 and returns to the circulating pipe 4 at the downstream of the hot user 3; mixing with another part of the hot water which has not entered the evaporator 10 of the hot user 3, has dissipated heat and still flows downstream of the hot user 3 along the circulation pipe 4; the two portions of hot water are mixed and continue to flow along the circulation loop 4 to the fourth heat consumer 3, i.e. the heat consumer 3 shown in figure 1 d.
When the mixed hot water flows to the hot user 3 along the circulation pipe 4 as shown in fig. c of fig. 1, and the hot water flow in the upstream circulation pipe 4 is smaller than the hot water flow required by the evaporator 10 of the hot user 3, a part of the hot water will return to the inlet of the distribution water supply pipe 6 of the hot user 3 from the outlet of the distribution water return pipe 7 of the hot user 3, and after mixing with the hot water from the upstream circulation pipe 4, pass through the inlet of the distribution water supply pipe 6 of the hot user 3, the suction end of the distribution water pump 5, the press-out end of the distribution water pump 5, the outlet of the distribution water supply pipe 6, the water side inlet of the evaporator 10 of the water source heat pump 9, and enter the evaporator 10 to indirectly exchange heat with the refrigerant; after the temperature of the heat released by the hot water is reduced, the hot water sequentially passes through the water side outlet end of the evaporator 10, the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7, returns to the circulating pipe 4 at the downstream of the hot user 3 and is divided into two parts; a part of the water returns to the inlet end of the distribution water supply pipe 6 of the hot user 3 through the circulating pipe 4 between the outlet end of the distribution water return pipe 7 of the hot user 3 and the inlet end of the distribution water supply pipe 6; the other part continues to flow along the circulation pipe 4 downstream of the outlet end of the distribution return pipe 7 of the heat consumer 3 to the fourth heat consumer 3, i.e. the heat consumer shown in fig. 1 d.
When the mixed hot water flows along the circulation pipe 4 to the heat consumer 3 shown in the diagram d of fig. 1, the hot water in the circulation pipe 4 is divided into two parts under the control of the resistance valve 16 of the heat consumer 3; part of hot water enters the evaporator 10 to perform indirect heat exchange with the refrigerant through the inlet end of the distribution water supply pipe 6, the outlet end of the distribution water supply pipe 6 and the water side inlet end of the evaporator 10 of the water source heat pump 9 in sequence; after the temperature of the heat released by the hot water is reduced, the hot water sequentially passes through the water side outlet end of the evaporator 10, the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 and returns to the circulating pipe 4 at the downstream of the hot user 3; mixing with another portion of hot water which has not dissipated in the evaporator 10 and flows downstream of the hot user 3 along the circulation pipe 4 through the resistance valve 16; mixing the two parts of hot water, and then continuously flowing to the circulating pump 2 along the circulating pipe 4; after being pressurized by the circulating pump 2, the heat returns to the heat source station 1 to be heated again.
From the above description it follows that: the two heat users 3 in the diagrams c and d in fig. 1 are close to the outlet end of the circulating pipe 4, heat is extracted from hot water in the circulating pipe 4 through the evaporator 10 of the water source heat pump 9, indoor system return water is heated through the condenser 11 of the same water source heat pump 9, and after the water temperature meets the requirement of the indoor system water supply temperature, the users are heated through the indoor heat dissipation tail end 20. In the working process, in the evaporator 10 of the water source heat pump 9, refrigerant and part of hot water or all hot water from the circulating pipe 4 are subjected to indirect heat exchange; the heat of the hot water is absorbed and evaporated into gas; then enters a compressor 12 of the water source heat pump 9 and is compressed into high-temperature and high-pressure gas; then enters a condenser 11 of the water source heat pump 9 to carry out indirect heat exchange with the return water of the indoor system; the refrigerant emits heat to heat the backwater, the heated backwater is provided for the indoor heat dissipation tail end 20 to supply heat for the user after meeting the water supply temperature requirement of the indoor system, and the refrigerant is condensed into liquid; the refrigerant liquid enters a throttle valve 13 after coming out of the condenser 11 and is throttled into a low-temperature low-pressure gas-liquid two-phase mixture; and then returns to the evaporator 10 of the water source heat pump 9, thus completing one heat pump cycle. In operation, the temperature of the water supply of the indoor system is controlled by the water source heat pump 9.
From the above description of the system operation: in the operation of the system shown in fig. 1, hot water produced by the heat source station 1 supplies heat to 4 heat consumers in sequence during the transportation from the inlet end of the circulation pipe 4 to the outlet end of the circulation pipe 4, and the temperature of the hot water in the circulation pipe 4 decreases in sequence; as is well known, under the current water source heat pump technology in the industry, the temperature of water at the outlet 10 of the evaporator of the water source heat pump 9 can be as low as 2.5 ℃; therefore, in practical engineering, the temperature of the hot water at the outlet end of the circulation pipe 4 can be reduced to at least 5 ℃ by using the system shown in FIG. 1; the temperature of the water is greatly lower than the return water temperature of the traditional double-pipe hot water heating system, so that the pipe diameter of a heating pipeline can be reduced under the condition of conveying the same heat; and the initial investment of the outdoor pipe network is reduced.
From the above description of the system operation: in the operation of the system shown in fig. 1, the user heat exchanging device 50 shown in fig. 1 a and d both rely on the resistance valve 16 to regulate the flow of hot water into the indoor heat sink 20 or the evaporator 10 of the water source heat pump 9, and the flow of hot water by-passed from the resistance valve 16; the resistance valve 16 does not influence the flow distribution of the other hot users 3 during the regulation. The user heat exchanging device 50 shown in fig. 1 b and c is controlled by the distribution water pump 5 to control the flow of hot water into the indoor heat dissipation terminal 20 or the evaporator 10 of the water source heat pump 9, and the flow of hot water by-pass from the circulation pipe 4 of the user heat exchanging device 50; no matter the distribution water pump 5 is a fixed-frequency pump or a variable-frequency pump, by means of the hot water flow regulation and control method introduced in the embodiment, the flow distribution of other hot users 3 cannot be affected during working; therefore, the system shown in fig. 1 of the invention overcomes the hydraulic imbalance of the traditional double-pipe hot water heating system, and avoids the mutual influence between the water flow distribution of each heat user; meanwhile, once the hot water flow control parameters are set, new hot users are not added or other hot users change the operation parameters and need to be debugged again; the operation debugging workload of the heating system is reduced.
Example 2
As shown in fig. 2, this embodiment is also a single-pipe heating system, which is used in the situation where there is a heating demand. The whole system comprises the following components: a heat source station 1, a circulating pump 2, 2 heat consumers 3 (shown in figures a and b of figure 2), a circulating pipe 4 and a backwater temperature sensor 22. The connection mode is as follows: the heat source station 1 is connected with the inlet end B of the heat source station 1 and returns to the heat source station 1 sequentially through the outlet end A of the heat source station 1, the inlet end of the circulating pipe 4, the heat consumer 3 shown in a picture a in figure 2, the heat consumer 3 shown in a picture B in figure 2, the suction end of the circulating pump 2, the extrusion end of the circulating pump 2 and the outlet end of the circulating pipe 4. The circulation pump 2 is a variable frequency pump.
As shown in fig. 2, a, the heat consumer 3, the circulation pipe 4 is in indirect connection with its indoor heat dissipation end 20. The user heat exchange device 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a water source heat pump 9, a preheater 19, an indoor water pump 21 and a resistance valve 16. The connection mode is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water return pipe 7 is also connected with the circulating pipe 4; a water source heat pump 9 is connected in series on the water route between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and the concrete connection mode is as follows: the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the water side of an evaporator 10 of a water source heat pump 9, and the outlet end of the water side of the evaporator 10 of the water source heat pump 9 is connected with the inlet end of a distribution water return pipe 7; the resistance valve 16 is arranged on the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the preheater 19 is provided on the distribution water supply pipe 6; the inlet end of the high temperature side of the preheater 19 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6, and the outlet end of the high temperature side of the preheater 19 is connected with the inlet end of the water side of the evaporator 10 of the water source heat pump 9 through the outlet end of the distribution water supply pipe 6; the outlet end of the low-temperature side of the preheater 19 is connected with the inlet end of the water side of the condenser 11 of the water source heat pump 9 through the suction end of an indoor water pump 21 and the pressure outlet end of the indoor water pump 21 in sequence; the inlet end of the low-temperature side of the preheater 19 is connected to an indoor return pipe 25.
The preheater 19 functions in operation as: the hot water in the circulating pipe 4 from the upstream is used for preheating the indoor system backwater so as to reduce the operation energy consumption of the water source heat pump 9. During operation, under the regulation and control of the resistance valve 16, a part of hot water in the circulating pipe 4 sequentially passes through the inlet end of the distribution water supply pipe 6 and the inlet end of the high-temperature side of the preheater 19 and enters the preheater 19; indirectly exchanging heat with indoor system return water from the outlet end of the indoor heat dissipation tail end 20 and also entering the preheater 19 through the inlet end of the low-temperature side of the preheater 19; the hot water emits heat to preheat the return water of the indoor system, after the temperature of the hot water is reduced, the hot water sequentially passes through the outlet end at the high-temperature side of the preheater 19, the outlet end of the distribution water supply pipe 6 and the inlet end at the water side of the evaporator 10 of the water source heat pump 9, enters the evaporator 10 of the water source heat pump 9, and carries out indirect heat exchange with the refrigerant, and after the hot water emits heat again and is cooled, the hot water sequentially passes through the outlet end at the water side of the evaporator 10 of the water source heat pump 9, the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 and is discharged into the downstream circulating pipe 4; mixing with another part of hot water which is not fed into the preheater 19 and the evaporator 10 of the water source heat pump 9 for heat dissipation and flows downstream along the circulating pipe 4 through the resistance valve 16; the two parts of hot water mix and continue to flow along the circulation loop 4 to the second heat consumer 3, i.e. the heat consumer 3 shown in the diagram b in fig. 2.
The indoor system backwater of the hot user 3 is preheated by the preheater 19, then sequentially passes through the outlet end at the low temperature side of the preheater 19, the suction end of the indoor water pump 21, the pressure outlet end of the indoor water pump 21 and the inlet end at the water side of the condenser 11 of the water source heat pump 9, enters the condenser 11 of the water source heat pump 9, and indirectly exchanges heat with the refrigerant superheated gas from the compressor 12, the preheated indoor system backwater is reheated, and after the temperature reaches the water supply requirement of the indoor system, sequentially passes through the outlet end at the water side of the condenser 11 of the water source heat pump 9, the indoor water supply pipe 24 and the inlet end of the indoor heat dissipation tail end 20, and enters the indoor heat dissipation tail end 20 to supply heat for the user. In operation, the heat pump cycle of the waterhead heat pump 9 is the same as in example 1. The resistance valve 16 is a differential pressure control valve or a self-operated differential pressure control valve, and the control method thereof is the same as that of the user heat exchange device 50 shown in fig. 1 d of embodiment 1.
The indoor water pump 21 in the user heat exchange device 50 can also be arranged on the water side outlet end pipeline of the condenser 11 of the water source heat pump 9; at this time, the connection mode of the user heat exchange device 50 is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water return pipe 7 is also connected with the circulating pipe 4; a water source heat pump 9 is connected in series on the water path between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and the concrete connection mode is as follows: the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the water side of an evaporator 10 of a water source heat pump 9, and the outlet end of the water side of the evaporator 10 of the water source heat pump 9 is connected with the inlet end of a distribution water return pipe 7; the resistance valve 16 is arranged on the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the preheater 19 is arranged on the distribution water supply pipe 6; the inlet end at the high temperature side of the preheater 19 is connected with the inlet end of the circulating pipe 4 through the inlet end of the distribution water supply pipe 6, and the outlet end at the high temperature side of the preheater 19 is connected with the inlet end at the water side of the evaporator 10 of the water source heat pump 9 through the outlet end of the distribution water supply pipe 6; the outlet end of the low-temperature side of the preheater 19 is connected with the inlet end of the water side of a condenser 11 of the water source heat pump 9; the inlet end of the low-temperature side of the preheater 19 is connected with an indoor return water pipe 25; the suction end of the indoor water pump 21 is connected with the water side outlet end of the condenser 11, and the pressure end of the indoor water pump 21 is connected with an indoor water supply pipe 24.
As shown in the diagram b of fig. 2, the circulation pipe 4 is also indirectly connected to the indoor heat radiation end 20 of the heat consumer 3. As shown in fig. 2, the difference between the user heat exchange device 50 shown in fig. b of fig. 2 and the user heat exchange device 50 shown in fig. a of fig. 2 of the present embodiment is: the resistance valve 16 in the latter system is replaced by a dispensing water pump 5. The distribution water pump 5 can be installed in the user heat exchange device 50 at the following three places: i) Is installed on the distribution water return pipe 7 (as shown in the diagram b in fig. 2); ii) a distribution water supply pipe 6 installed between the inlet end of the high temperature side of the preheater 19 and the inlet end of the distribution water supply pipe 6; iii) Is installed on the distribution water supply pipe 6 between the outlet end of the high temperature side of the preheater 19 and the outlet end of the distribution water supply pipe 6.
Take the example that the distribution water pump 5 is installed on the distribution water return pipe 7 (as shown in fig. 2 b). When the flow rate of hot water from the upstream circulating pipe 4 is larger than the flow rate of hot water required by the evaporator 10 of the water source heat pump 9, under the action of the distribution water pump 5, a part of hot water in the circulating pipe 4 sequentially passes through the inlet end of the distribution water supply pipe 6 and the inlet end of the high-temperature side of the preheater 19 and enters the preheater 19; indirect heat exchange is carried out with indoor system return water which comes from the outlet end of the indoor heat dissipation tail end 20 and also enters the preheater 19 through the indoor return water pipe 25 and the inlet end at the low temperature side of the preheater 19 in sequence; the hot water emits heat to preheat the return water of the indoor system, after the temperature of the hot water is reduced, the hot water sequentially passes through the outlet end at the high-temperature side of the preheater 19, the outlet end of the distribution water supply pipe 6 and the inlet end at the water side of the evaporator 10 of the water source heat pump 9, enters the evaporator 10 of the water source heat pump 9, and carries out indirect heat exchange with the refrigerant, and after the hot water emits heat again and is cooled, the hot water sequentially passes through the outlet end at the water side of the evaporator 10 of the water source heat pump 9, the inlet end of the distribution water return pipe 7, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5 and the outlet end of the distribution water return pipe 7 and is discharged into the downstream circulating pipe 4; mixing with another part of hot water which does not enter a preheater 19 and is radiated in an evaporator 10 of a water source heat pump 9 and continuously flows into the downstream along a circulating pipe 4; the two parts of hot water are mixed and then continuously flow to the circulating pump 2 along the circulating pipe 4; after being pressurized by the circulating pump 2, the mixture sequentially passes through the outlet end of the circulating pipe 4 and the inlet end B of the heat source station 1 and returns to the heat source station 1 to be heated again.
In the operation process, when the flow of the hot water from the upstream circulating pipe 4 is smaller than the flow of the hot water required by the evaporator 10, a part of the hot water discharged into the downstream circulating pipe 4 from the outlet end of the distribution water return pipe 7 returns to the inlet end of the distribution water supply pipe 6, is mixed with the hot water from the upstream circulating pipe 4, and then sequentially enters the preheater 19 through the inlet end of the distribution water supply pipe 6 and the inlet end of the high-temperature side of the preheater 19; the indoor system return water which comes from the outlet end of the indoor heat dissipation tail end 20 and also enters the preheater 19 through the indoor return water pipe 25 and the inlet end of the low-temperature side of the preheater 19 in sequence carries out indirect heat exchange; the hot water emits heat to preheat the return water, after the temperature of the hot water is reduced, the hot water sequentially passes through the outlet end at the high-temperature side of a preheater 19, the outlet end of a distribution water supply pipe 6 and the inlet end at the water side of an evaporator 10 of a water source heat pump 9, enters the evaporator 10 of the water source heat pump 9, is subjected to indirect heat exchange with a refrigerant, and after the hot water emits heat again and is cooled, the hot water sequentially passes through the outlet end at the water side of the evaporator 10 of the water source heat pump 9, the inlet end of a distribution water return pipe 7, the suction end of a distribution water pump 5, the pressure outlet end of the distribution water pump 5 and the outlet end of the distribution water return pipe 7, and is discharged into a circulating pipe 4 to be divided into two parts; a part of the hot water returns to the inlet end of the distribution water supply pipe 6 through the circulating pipe 4 between the outlet end of the distribution water return pipe 7 and the inlet end of the distribution water supply pipe 6; the other part of the hot water continuously flows to the circulating pump 2 along the circulating pipe 4 at the downstream of the outlet end of the distribution water return pipe 7; the hot water is pressurized by the circulating pump 2 and then returns to the heat source station 1 to be heated again.
In order to ensure that the flow of hot water entering the evaporator 10 is stable during operation, the method of regulating the user heat exchange device 50 shown in fig. 1 and c of embodiment 1 can also be adopted. When the user heat exchanging device 50 uses the flow regulating valve to stabilize the flow of the hot water into the evaporator 10 regardless of whether the distribution water pump 5 is installed on the distribution water supply pipe 6 or the distribution water return pipe 7, the flow regulating valve may be installed on the distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the high temperature side outlet end of the preheater 19, or on the distribution water supply pipe 6 at the high temperature side inlet end of the preheater 19, in addition to the distribution water return pipe 7.
When this user heat transfer device 50's distribution water pump 5 adopts the frequency conversion mode to stabilize the hot water flow who gets into evaporimeter 10, and distribution water pump 5 installs on distribution wet return 7, and distribution water pump 5 is pressed the end and is linked to each other with distribution wet return 7 exit end, this user heat transfer device 50's differential pressure sensor connected mode is: the high-pressure measuring point of the pressure difference controller is connected with a distribution water supply pipe 6 at the water side inlet end of the evaporator 10 or connected with the distribution water supply pipe 6 at the high-temperature side inlet end of the preheater 19; and a low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the suction end of the distribution water pump 5.
When the distribution water pump 5 is arranged on the distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the high temperature side outlet end of the preheater 19; and the suction end of the distribution water pump 5 is connected with the outlet end of the high-temperature side of the preheater 19; the connection mode of the differential pressure sensor of the user heat exchange device 50 is as follows: the high-pressure measuring point of the pressure difference controller is connected with a distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the extrusion end of the distribution water pump 5, and the low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe 7 at the water side outlet end of the evaporator 10.
The distribution water pump 5 of the user heat exchange device 50 can also be arranged on the distribution water supply pipe 6 at the inlet end of the high-temperature side of the preheater 19, and the suction end of the distribution water pump 5 is connected with the inlet end of the distribution water supply pipe 6; the connection mode of the differential pressure sensor of the user heat exchange device 50 is as follows: the high-pressure measuring point of the pressure difference controller is connected with a distribution water supply pipe 6 at the water side inlet end of the evaporator 10 or connected with the distribution water supply pipe 6 between the high-temperature side inlet end of the preheater 19 and the extrusion end of the distribution water pump 5, and the low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe 7 at the water side outlet end of the evaporator 10.
Example 3
As shown in fig. 3, this embodiment is also a single-pipe heating system, and is used in situations where there is a heating demand. The heat source station 1 in this embodiment is an urban heat network heat exchange station, which comprises: a city heat supply network water supply pipe 101, a city heat supply network water return pipe 100, a plate type heat exchanger 55 and an electric regulating valve 32; during operation, the electric control valve 32 regulates and controls the hot water temperature at the outlet end of the low-temperature side of the plate heat exchanger 55 according to the climate compensation curve set in the controller of the heat source station 1 and the outdoor air temperature, namely: hot water outlet temperature at outlet end a of heat source station 1. The whole single-pipe heat supply system comprises the following components: heat source station 1, circulation pump 2, 2 heat consumers 3 (as shown in fig. 3, a and b), circulation pipe 4, return water temperature sensor 22, and pressurizing station 14. The connection mode is as follows: the heat source station 1 is connected with the inlet end B of the heat source station 1 and returns to the heat source station 1 sequentially through the outlet end A of the heat source station 1, the inlet end of the circulating pipe 4, the heat consumer 3 shown in a figure a of figure 3, the pressurizing station 14, the heat consumer 3 shown in a figure B of figure 3, the suction end of the circulating pump 2, the extrusion end of the circulating pump 2 and the outlet end of the circulating pipe 4. The circulation pump 2 is a variable frequency pump, and the booster pump 14 is a constant frequency pump. The function of the pressure pump 14 is: and additional circulating power is provided for the system to make up for the shortage of the circulating pump 2. It can be installed on any section of the circulation pipe 4 between the heat consumers 3, and the above-mentioned installation method is applicable to all embodiments of the present invention.
As shown in the diagram a of fig. 3, the circulation pipe 4 is also indirectly connected to the indoor heat dissipation terminal 20 of the heat consumer 3. The user heat exchange device 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a water-water type heat exchanger 28, an indoor water pump 21 and a resistance valve 16. The connection mode is as follows: the inlet end of the high temperature side of the water-water type heat exchanger 28 is connected with the circulating pipe 4 through the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water supply pipe 6 in sequence; the outlet end of the high-temperature side of the water-water type heat exchanger 28 is connected with the circulating pipe 4 through the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 in sequence; a resistance valve 16 is arranged on the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the inlet end of the low-temperature side of the water-water type heat exchanger 28 is connected with the pressure outlet end of the indoor water pump 21.
As shown in the drawing a of fig. 3, the suction end of the indoor water pump 21 in the user heat exchange device 50 is connected with the outlet end of the indoor heat dissipation terminal 20 through the indoor return pipe 25; the outlet end of the low temperature side of the water-water heat exchanger 28 is connected to the inlet end of the indoor heat rejection end 20 by an indoor water supply pipe 24. The resistance valve 16 is an electrically adjustable valve for regulating the supply water temperature of the indoor system, namely: the temperature of the hot water at the outlet end of the low temperature side of the water-water heat exchanger 28.
When the water-water type heat exchanger works, under the regulation and control of the resistance valve 16, a part of hot water in the circulating pipe 4 sequentially passes through the inlet end of the distribution water supply pipe 6, the outlet end of the distribution water supply pipe 6 and the inlet end of the high-temperature side of the water-water type heat exchanger 28 and enters the water-water type heat exchanger 28; indirectly exchanges heat with indoor system return water which comes from the outlet end of the indoor heat dissipation tail end 20, sequentially passes through an indoor return water pipe 25, the suction end of an indoor water pump 21, the pressure outlet end of the indoor water pump 21 and the inlet end of the low-temperature side of the water-water type heat exchanger 28 and also enters the water-water type heat exchanger 28; the hot water emits heat to heat the return water of the indoor system, so that the temperature of the return water meets the requirement of the water supply temperature of the indoor system, and the return water is discharged into a downstream circulating pipe 4 after the temperature of the return water is reduced and then sequentially passes through the outlet end at the high-temperature side of the water-water type heat exchanger 28, the inlet end of the distribution return pipe 7 and the outlet end of the distribution return pipe 7; mixing with another part of the hot water which has not entered the water-water heat exchanger 28 to dissipate heat and flows downstream along the circulation pipe 4 through the resistance valve 16; the two portions of hot water mix and continue to flow along the circulation loop 4 to the second heat consumer 3, i.e. the heat consumer 3 shown in the diagram b in fig. 3.
In practical application, the indoor water pump 21 in the user heat exchange device 50 can also be installed at the outlet end of the low-temperature side of the water-water type heat exchanger 28. At this time, the connection mode of the user heat exchange device 50 is as follows: the inlet end of the high temperature side of the water-water type heat exchanger 28 is connected with the circulating pipe 4 through the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water supply pipe 6 in sequence; the outlet end of the high-temperature side of the water-water type heat exchanger 28 is connected with the circulating pipe 4 through the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 in sequence; a resistance valve 16 is arranged on the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the outlet end of the low-temperature side of the water-water type heat exchanger 28 is connected with the suction end of the indoor water pump 21.
As shown in the diagram b of fig. 3, the circulation pipe 4 is also in indirect connection with its indoor heat dissipation end 20. The user heat exchange device 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a distribution water pump 5, a water source heat pump 9, an indoor water pump 21 and a flow dividing three-way flow regulating valve 18. The connection mode is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water return pipe 7 is also connected with the circulating pipe 4; a water source heat pump 9 is connected in series on the water path between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and the concrete connection mode is as follows: the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the water side of an evaporator 10 of a water source heat pump 9, and the outlet end of the water side of the evaporator 10 of the water source heat pump 9 is connected with the inlet end of a distribution water return pipe 7; the flow-dividing three-way flow regulating valve 18 is arranged on the distribution water return pipe 7; the straight-flow outlet of the flow dividing three-way flow regulating valve 18 is connected with the circulating pipe 4 through the outlet end of the distribution water return pipe 7; the bypass outlet of the shunt three-way flow control valve 18 is connected with the distribution water supply pipe 6 through the inlet end of the bypass pipe 23 and the outlet end of the bypass pipe 23 in sequence; the inlet of the flow dividing three-way flow regulating valve 18 is connected with the outlet end of the water side of the evaporator 10 of the water source heat pump 9 through the pressure outlet end of the distribution water pump 5, the suction end of the distribution water pump 5 and the inlet end of the distribution water return pipe 7 in sequence; the pressure outlet end of the indoor water pump 21 is connected with the water side inlet end of the condenser 11 of the water source heat pump 9.
The basic composition, connection relationship and working principle of the water source heat pump 9 in the user heat exchange device 50 are the same as those of the user heat exchange device 50 shown in fig. c of fig. 1 in embodiment 1. The indoor water pump 21 of the user heat exchange device 50 can also be arranged at the water side outlet end of the condenser 11 of the water source heat pump 9. At this time, the indoor water pump 21 is connected in the user heat exchange device 50 in the following manner: the suction end of the indoor water pump 21 is connected with the water side outlet end of the condenser 11 of the water source heat pump 9; while the connection relationship of the other components in the user heat exchange device 50 is unchanged. The connection mode of the flow dividing three-way flow regulating valve 18 in the user heat exchange device 50 is suitable for all the heat users 3 simultaneously using the water source heat pump 9 and the distribution water pump 5.
In the actual engineering, besides the requirement of the lowest hot water flow limit, the evaporator 10 of some types of water source heat pumps 9 also has the highest water temperature limit for the temperature of the hot water entering the evaporator 10; when the water temperature exceeds the maximum water temperature limit value, the water source heat pump 9 cannot work normally; therefore, during operation, the shunt three-way flow control valve 18 has the following functions: a part of hot water from the water side outlet end of the evaporator 10 sequentially passes through the inlet end of the distribution water return pipe 7, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5, the inlet of the distribution three-way flow regulating valve 18, the bypass outlet of the distribution three-way flow regulating valve 18, the inlet end of the bypass pipe 23 and the outlet end of the bypass pipe 23 to return to the distribution water supply pipe 6, and is mixed with a part of hot water from the upstream circulating pipe 4 entering the distribution water supply pipe 6 through the inlet end of the distribution water supply pipe 6, so that the temperature of the hot water at the water side inlet end of the evaporator 10 is regulated; the other part of the hot water from the water outlet of the evaporator 10 flows into the downstream circulating pipe 4 through the inlet of the distribution return pipe 7, the suction of the distribution water pump 5, the pressure outlet of the distribution water pump 5, the inlet of the three-way flow control valve 18, the straight outlet of the three-way flow control valve 18 and the outlet of the distribution return pipe 7 in sequence.
The working flow of the scheme is as follows: i) When the temperature of the hot water in the upstream circulating pipe 4 exceeds the maximum water temperature limit requirement of the evaporator 10, a part of the hot water from the upstream circulating pipe 4 enters the distribution water supply pipe 6 through the inlet end of the distribution water supply pipe 6 under the action of the distribution water pump 5; mixing with a part of hot water which is from the water side outlet end of the evaporator 10, sequentially passes through the inlet end of the distribution water return pipe 7, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5, the inlet of the flow dividing three-way flow regulating valve 18, the bypass outlet of the flow dividing three-way flow regulating valve 18, the inlet end of the bypass pipe 23 and the outlet end of the bypass pipe 23 and returns to the distribution water supply pipe 6, and after the mixed water temperature reaches the water temperature requirement of the inlet of the evaporator 10, the mixed water temperature sequentially passes through the outlet end of the distribution water supply pipe 6 and the water side inlet end of the evaporator 10 and enters the evaporator 10 to exchange heat with refrigerant; after the hot water emits heat and is cooled, the hot water enters the flow dividing three-way flow regulating valve 18 to be divided into two paths after passing through the water side outlet end of the evaporator 10, the inlet end of the distribution water return pipe 7, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5 and the inlet of the flow dividing three-way flow regulating valve 18 in sequence; one path of the water returns to the distribution water supply pipe 6 through a bypass outlet of the shunt three-way flow control valve 18 and a bypass pipe 23 in sequence; the other path of the hot water is discharged into the circulating pipe 4 through the straight flow outlet of the flow dividing three-way flow regulating valve 18 and the outlet end of the distribution water return pipe 7 in sequence, is radiated by the evaporator 10 and flows into the other part of the downstream hot water through the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7 to be mixed; the two parts of hot water are mixed and then continuously flow to the circulating pump 2 along the circulating pipe 4; after being pressurized by the circulating pump 2, the hot water sequentially passes through the outlet end of the circulating pipe 4 and the inlet end B of the heat source station 1 and returns to the heat source station 1 to be heated again.
ii) in the running process, when the hot water temperature of the upstream circulating pipe 4 meets the requirement of the maximum water temperature limit value of the evaporator 10, the bypass outlet of the shunting three-way flow regulating valve 18 is closed, and the direct-flow outlet of the shunting three-way flow regulating valve 18 is fully opened; the hot water at the water side outlet end of the evaporator 10 does not return to the distribution water supply pipe 6 through the bypass outlet of the three-way flow control valve 18, but all the hot water flows into the circulating pipe 4 through the straight outlet of the three-way flow control valve 18 and the outlet end of the distribution water return pipe 7 in sequence. At this time, the workflow of this scheme is the same as that of the hot user 3 shown in fig. c of fig. 1 of embodiment 1. The scheme is characterized by comprising an indoor system composition, a connection mode and a working process; and the regulation method in operation for ensuring a steady value of the flow of hot water into the evaporator 10 is the same as that of the heat consumer 3 shown in fig. 1 c of example 1.
At this time, when the distribution water pump 5 is a fixed frequency pump, the connection mode of the flow control valve in the user heat exchange device 50 is as follows: besides being installed on the distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the outlet end of the bypass pipe 23, the distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the suction end of the distribution water pump 5 or the distribution water return pipe 7 between the pressure end of the distribution water pump 5 and the inlet of the flow dividing three-way flow regulating valve 18 can be installed to ensure that the flow of the hot water entering the evaporator 10 is a preset expected value.
When the distribution water pump 5 is a variable frequency pump, the connection mode of the differential pressure sensor of the user heat exchange device 50 is as follows: and a high-pressure measuring point of the differential pressure controller is connected with a distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the outlet end of the bypass pipe 23, and a low-pressure measuring point of the differential pressure controller is connected with a distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the suction end of the distribution water pump 5.
In practical applications, the distribution water pump 5 may be disposed on the distribution water supply pipe 6 between the water-side inlet end of the evaporator 10 and the outlet end of the bypass pipe 23, and the pressure outlet end of the distribution water pump 5 is connected to the water-side inlet end of the evaporator 10 (as shown in fig. 6 b). At this time, the connection mode of the user heat exchange device 50 is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water return pipe 7 is also connected with the circulating pipe 4; a water source heat pump 9 is connected in series on the water path between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and the concrete connection mode is as follows: the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the water side of an evaporator 10 of a water source heat pump 9, and the outlet end of the water side of the evaporator 10 of the water source heat pump 9 is connected with the inlet end of a distribution water return pipe 7; a distribution water pump 5 is arranged on the distribution water supply pipe 6, and the extrusion end of the distribution water pump 5 is connected with the water side inlet end of an evaporator 10 of a water source heat pump 9 through the outlet end of the distribution water supply pipe 6; the flow-dividing three-way flow regulating valve 18 is arranged on the distribution water return pipe 7; the straight-flow outlet of the flow dividing three-way flow regulating valve 18 is connected with the circulating pipe 4 through the outlet end of the distribution water return pipe 7; a bypass outlet of the shunt three-way flow regulating valve 18 is connected with a distribution water supply pipe 6 at the suction end of the distribution water pump 5 through an inlet end of a bypass pipe 23 and an outlet end of the bypass pipe 23 in sequence; the inlet of the flow dividing three-way flow regulating valve 18 is connected with the outlet end of the water side of the evaporator 10 of the water source heat pump 9 through the inlet end of the distribution water return pipe 7; the pressure outlet end of the indoor water pump 21 is connected with the water side inlet end of the condenser 11 of the water source heat pump 9.
Similarly, the indoor water pump 21 of the user heat exchange device 50 can be arranged at the water side outlet end of the condenser 11 of the water source heat pump 9. At this time, the indoor water pump 21 is connected in the user heat exchange device 50 in the following manner: the suction end of the indoor water pump 21 is connected with the water side outlet end of the condenser 11 of the water source heat pump 9.
At this time, when the distribution water pump 5 is a fixed-frequency pump, the connection mode of the flow control valve in the user heat exchange device 50 is as follows: besides being installed on the distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the inlet of the flow dividing three-way flow regulating valve 18, the distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the extrusion end of the distribution water pump 5 or the distribution water supply pipe 6 between the suction end of the distribution water pump 5 and the outlet end of the bypass pipe 23 can be installed to ensure that the flow of the hot water entering the evaporator 10 is a preset expected value. When the distribution water pump 5 is a variable frequency pump, the connection mode of the differential pressure sensor in the user heat exchange device 50 is as follows: the high-pressure measuring point of the pressure difference controller is connected with a distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the extrusion end of the distribution water pump 5, and the low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the inlet of the flow dividing three-way flow regulating valve 18.
Example 4
As shown in fig. 4, this embodiment is also a single-pipe heating system, and is used in situations where there is a heating demand. The heat source station 1 in this embodiment is an urban heat supply network water supply pipe 101 and an urban heat supply network water return pipe 100; the connection mode of the heat source station 1 is as follows: the urban heat supply network water supply pipe 101 is connected with the outlet end A of the heat source station 1, and the urban heat supply network water return pipe 100 is connected with the inlet end B of the heat source station 1. The whole single-pipe heating system comprises the following components: heat source station 1, 2 heat consumers 3 (as shown in figures a and b of figure 4), circulating pipe 4, return water temperature sensor 22, regulating valve 8. The connection mode is as follows: the heat source station 1 is connected with the inlet end B of the heat source station 1 and returns to the heat source station 1 sequentially through the outlet end A of the heat source station 1, the inlet end of the circulating pipe 4, the heat consumer 3 shown in a diagram a in fig. 4, the heat consumer 3 shown in a diagram B in fig. 4, the regulating valve 8 and the outlet end of the circulating pipe 4. The regulating valve 8 is typically an electric two-way valve; can be arranged on any section of the circulating pipe 4 between every two heat users 3; the above-described setting method of the regulating valve 8 is applicable to all embodiments of the present invention. During operation, the regulating valve 8 has the following functions: the flow rate of the hot water in the circulation pipe 4 is regulated by changing the valve opening of the regulating valve 8, so that the actual hot water temperature at the outlet end of the circulation pipe 4 is within a desired range.
As shown in the diagram a of fig. 4, the circulation pipe 4 is also indirectly connected to the indoor heat radiation end 20 of the heat user 3. The user heat exchange device 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a distribution water pump 5, a water-water type heat exchanger 28 and an indoor water pump 21. The connection mode is as follows: the inlet end of the high temperature side of the water-water type heat exchanger 28 is connected with the circulating pipe 4 through the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water supply pipe 6 in sequence; the outlet end of the high-temperature side of the water-water type heat exchanger 28 is connected with the circulating pipe 4 through the inlet end of the distribution water return pipe 7, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5 and the outlet end of the distribution water return pipe 7 in sequence; the inlet end of the low-temperature side of the water-water type heat exchanger 28 is connected with the pressure outlet end of the indoor water pump 21.
The distribution water pump 5 may be installed on the distribution water supply pipe 6, and in this case, the user heat exchanging device 50 may be connected in the following manner: the inlet end of the high temperature side of the water-water type heat exchanger 28 is connected with the circulating pipe 4 through the outlet end of the distribution water supply pipe 6, the pressure outlet end of the distribution water pump 5, the suction end of the distribution water pump 5 and the inlet end of the distribution water supply pipe 6 in sequence; the outlet end of the high-temperature side of the water-water type heat exchanger 28 is connected with the circulating pipe 4 through the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7 in sequence; the inlet end of the low-temperature side of the water-water type heat exchanger 28 is connected with the pressure outlet end of the indoor water pump 21.
The indoor water pumps 21 of the two user heat exchange devices 50 can also be arranged at the outlet ends of the low-temperature sides of the water-water type heat exchangers 28. At this time, the indoor water pump 21 is connected in the user heat exchange device 50 in the following manner: the suction end of the indoor water pump 21 is connected with the outlet end of the low-temperature side of the water-water type heat exchanger 28; the other parts of the user heat exchange device 50 are connected in a constant manner.
In operation, the distribution pump 5 of the user heat exchange device 50 is used for extracting a part of hot water from the upstream circulating pipe 4 and sending the hot water into the water-water type heat exchanger 28 to heat the indoor system backwater; the distribution water pump 5 regulates and controls the water supply temperature of an indoor system in a mode of changing the working frequency, namely: the water-water type heat exchanger 28 has a low temperature side outlet water temperature.
As shown in the diagram b of fig. 4, the circulation pipe 4 is also indirectly connected to the indoor heat radiation end 20 of the heat user 3. The difference between the user heat exchange device 50 shown in fig. 4 b and the user heat exchange device 50 shown in fig. 1 c in embodiment 1 is that: a confluence three-way flow regulating valve 17 is additionally arranged on a distribution water supply pipe 6 of the user heat exchange device 50; therefore, the user heat exchange device 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a distribution water pump 5, a water source heat pump 9, an indoor water pump 21 and a confluence three-way flow regulating valve 17. The connection mode is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water return pipe 7 is also connected with the circulating pipe 4; a water source heat pump 9 is connected in series on the water route between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and the concrete connection mode is as follows: the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the water side of an evaporator 10 of a water source heat pump 9, and the outlet end of the water side of the evaporator 10 of the water source heat pump 9 is connected with the inlet end of a distribution water return pipe 7; the confluence three-way flow regulating valve 17 is arranged on the distribution water supply pipe 6; the direct current inlet of the confluence three-way flow regulating valve 17 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6; a bypass inlet of the confluence three-way flow regulating valve 17 is connected with the distribution water return pipe 7 through an outlet end of a bypass pipe 23 and an inlet end of the bypass pipe 23 in sequence; the outlet of the confluence three-way flow regulating valve 17 is connected with the inlet end of the water side of the evaporator 10 of the water source heat pump 9 through the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5 and the outlet end of the distribution water supply pipe 6 in sequence; the pressure outlet end of the indoor water pump 21 is connected with the water side inlet end of the condenser 11 of the water source heat pump 9.
The basic composition, connection relationship and operation principle of the water source heat pump 9 in the user heat exchange device 50 are the same as those of the user heat exchange device 50 shown in fig. c in fig. 1. The indoor water pump 21 of the user heat exchange device 50 can also be arranged at the water side outlet end of the condenser 11 of the water source heat pump 9. At this time, the indoor water pump 21 is connected in the user heat exchange device 50 in the following manner: the suction end of the indoor water pump 21 is connected with the water side outlet end of a condenser 11 of the water source heat pump 9; while the other parts of the user heat exchange device 50 are connected in the same way. The function of the confluence three-way flow control valve 17 in the user heat exchange device 50 is the same as that of the diversion three-way flow control valve 18 in the user heat exchange device 50 shown in fig. 3 b of embodiment 3.
The working flow of the scheme is as follows: i) When the temperature of the hot water in the upstream circulating pipe 4 exceeds the maximum water temperature limit requirement of the evaporator 10 during operation, a part of the hot water from the upstream circulating pipe 4 sequentially passes through the inlet end of the distribution water supply pipe 6 and the direct-current inlet of the confluence three-way flow regulating valve 17 to enter the confluence three-way flow regulating valve 17 under the action of the distribution water pump 5; the mixed hot water is mixed with a part of hot water which comes from the water side outlet end of the evaporator 10, sequentially passes through the inlet end of the distribution water return pipe 7, the inlet end of the bypass pipe 23, the outlet end of the bypass pipe 23 and the bypass flow inlet of the confluence three-way flow regulating valve 17, returns to the confluence three-way flow regulating valve 17, and after the mixed hot water reaches the water temperature requirement of the inlet of the evaporator 10, the mixed hot water sequentially passes through the outlet of the confluence three-way flow regulating valve 17, the suction end of the distribution water pump 5, the press-out end of the distribution water pump 5, the outlet end of the distribution water supply pipe 6 and the water side inlet end of the evaporator 10 and enters the evaporator 10 to exchange heat with refrigerant; the hot water is discharged heat and cooled, and then is divided into two paths through the water side outlet end of the evaporator 10, the inlet end of the distribution return pipe 7 and the inlet end of the bypass pipe 23 in sequence; one path of the water returns to the distribution water supply pipe 6 through a bypass pipe 23 and a bypass inlet of the confluence three-way flow regulating valve 17 in sequence; the other path is discharged into the circulating pipe 4 through the outlet end of the distribution water return pipe 7, is mixed with the other part of hot water which does not enter the evaporator 10 for heat dissipation and flows into the downstream through the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the two parts of hot water are mixed and then continue to flow to the regulating valve 8 along the circulating pipe 4; then returns to the heat source station 1 after passing through the outlet end of the circulating pipe 4 and the inlet end B of the heat source station 1 in turn.
ii) in the running process, when the hot water temperature of the upstream circulating pipe 4 meets the requirement of the maximum water temperature limit value of the evaporator 10, the bypass inlet of the confluence three-way flow regulating valve 17 is closed, and the direct-current inlet of the confluence three-way flow regulating valve 17 is fully opened; the hot water at the water side outlet end of the evaporator 10 does not return to the distribution water supply pipe 6 through the bypass inlet of the confluence three-way flow control valve 17, but all the hot water flows into the circulation pipe 4 through the outlet end of the distribution water return pipe 7. At this time, the working flow of the scheme is the same as that of the user heat exchange device 50 shown in fig. c of fig. 1 of the embodiment 1.
The indoor system, the water source heat pump 9 in the scheme form, the connection mode and the working process; and the method of regulating the flow of hot water into the evaporator 10 to a predetermined desired value during operation is the same as that of the user heat exchanger 50 shown in fig. 3 b of example 3. At this time, when the distribution water pump 5 is a fixed-frequency pump, the connection mode of the flow control valve in the user heat exchange device 50 is as follows: besides being arranged on the distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the inlet end of the bypass pipe 23, the distribution water return pipe can also be arranged on the distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the extrusion end of the distribution water pump 5, or on the distribution water supply pipe 6 between the suction end of the distribution water pump 5 and the outlet of the confluence three-way flow regulating valve 17, so as to ensure that the flow of hot water entering the evaporator 10 is constant. When the distribution water pump 5 is a variable frequency pump, the connection mode of the differential pressure sensor of the user heat exchange device 50 is as follows: the high-pressure measuring point of the pressure difference controller is connected with a distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the extrusion end of the distribution water pump 5, and the low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the inlet end of the bypass pipe 23.
In practical applications, the distribution water pump 5 may be disposed on the distribution water return pipe 7 between the water-side outlet end of the evaporator 10 and the inlet end of the bypass pipe 23, and the suction end of the distribution water pump 5 is connected to the water-side outlet end of the evaporator 10 (as shown in fig. 5 b). At this time, the connection mode of the user heat exchange device 50 is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water return pipe 7 is also connected with the circulating pipe 4; a water source heat pump 9 is connected in series on the water path between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7, and the concrete connection mode is as follows: the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the water side of an evaporator 10 of a water source heat pump 9, and the outlet end of the water side of the evaporator 10 of the water source heat pump 9 is connected with the inlet end of a distribution water return pipe 7; the confluence three-way flow regulating valve 17 is arranged on the distribution water supply pipe 6; the direct current inlet of the confluence three-way flow regulating valve 17 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6; a bypass inlet of the confluence three-way flow regulating valve 17 is connected with the distribution water return pipe 7 through an outlet end of a bypass pipe 23 and an inlet end of the bypass pipe 23 in sequence; the outlet of the confluence three-way flow regulating valve 17 is connected with the water side inlet end of an evaporator 10 of a water source heat pump 9 through the outlet end of a distribution water supply pipe 6; the distribution water pump 5 is arranged on the distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the inlet end of the bypass pipe 23, and the suction end of the distribution water pump 5 is connected with the water side outlet end of the evaporator 10; the pressure outlet end of the indoor water pump 21 is connected with the water side inlet end of the condenser 11 of the water source heat pump 9.
The basic composition, connection and working principle of the water source heat pump 9 in the user heat exchange device 50 are the same as those of the user heat exchange device 50 shown in fig. c in fig. 1. The indoor water pump 21 in the user heat exchange device 50 can also be arranged at the water side outlet end of the condenser 11 of the water source heat pump 9; at this time, the indoor water pump 21 is connected in the user heat exchange device 50 in the following manner: the suction end of the indoor water pump 21 is connected with the water side outlet end of the condenser 11 of the water source heat pump 9.
In operation, when the distribution water pump 5 in the user heat exchange device 50 is a fixed-frequency pump, the connection mode of the flow control valve in the user heat exchange device 50 is as follows: besides being installed on the distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the outlet of the confluence three-way flow control valve 17, the distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the suction end of the distribution water pump 5 or the distribution water return pipe 7 between the press-out end of the distribution water pump 5 and the inlet end of the bypass pipe 23 can be installed to ensure that the flow of the hot water entering the evaporator 10 is a preset expected value. When the distribution water pump 5 of the user heat exchange device 50 is a variable frequency pump, the connection mode of the differential pressure sensor in the user heat exchange device 50 is as follows: the high-pressure measuring point of the pressure difference controller is connected with a distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the outlet of the confluence three-way flow regulating valve 17, and the low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the suction end of the distribution water pump 5.
The connection mode of the converging three-way flow regulating valve 17 in the system is suitable for all the user heat exchange devices 50 which simultaneously use the water source heat pump 9 and the distribution water pump 5.
Example 5
As shown in fig. 5, this embodiment is also a single-pipe heating system, and is used in situations where there is a heating demand. The heat source station 1 in this embodiment is an urban heat supply network return pipe 100; the connection mode of the heat source station 1 is as follows: the upstream of the urban heat supply network water return pipe 100 is connected with the outlet end A of the heat source station 1, and the downstream of the urban heat supply network water return pipe 100 is connected with the inlet end B of the heat source station 1. As shown in fig. 5, the whole single-pipe heating system comprises the following components: the system comprises a heat source station 1, a circulating pump 2, 2 heat users 3 (shown in figures a and b in figure 5), a circulating pipe 4, a return water temperature sensor 22, a heat supplementing station 15, a regulating valve 8 and a differential pressure control valve 26. The connection mode is as follows: the heat source station 1 returns to the heat source station 1 through an outlet end A of the heat source station 1, an inlet end of a circulating pipe 4, a suction end of a circulating pump 2, a pressure outlet end of the circulating pump 2, a heat consumer 3 shown in a drawing a of fig. 5, a heat replenishing station 15, a heat consumer 3 shown in a drawing B of fig. 5, a regulating valve 8, a differential pressure control valve 26, an outlet end of the circulating pipe 4 and an inlet end B of the heat source station 1 in sequence.
The circulating pump 2 is a fixed-frequency pump; the regulating valve 8 is an electric two-way valve. During operation, the regulating valve 8 has the following functions: the flow rate of the hot water in the circulation pipe 4 is regulated by changing the valve opening of the regulating valve 8, so that the actual hot water temperature at the outlet end of the circulation pipe 4 is within a desired range. The specific control method comprises the following steps: a backwater temperature sensor 22 is arranged on the pipeline at the outlet end of the circulating pipe 4 and is used for detecting the actual temperature of the hot water at the outlet end of the circulating pipe 4. In the working process, the actual hot water temperature at the outlet end of the circulating pipe 4 detected by the backwater temperature sensor 22 is transmitted to the controller of the heat source station 1 and is compared with the expected hot water temperature value at the outlet end of the circulating pipe 4 set in the controller; according to the comparison result, the controller of the heat source station 1 issues a command to regulate the flow rate of the hot water in the circulation pipe 4 by changing the valve opening of the regulating valve 8, so that the actual hot water temperature at the outlet end of the circulation pipe 4 is within a desired range. In actual engineering, in order to make the regulating valve 8 have better flow rate regulating performance, the differential pressure control valve 26 connected in series with the regulating valve 8 is used for controlling the actual differential pressure at the inlet and the outlet of the regulating valve 8 to be a set value. The heat supplementing station 15 can be any one or more of a boiler, a heat pump unit (particularly a transcritical carbon dioxide air source heat pump), a waste heat recovery device, an urban heat supply network heat exchange station, a geothermal well heat exchange station and the like; is used for compensating the shortage of heat supply of the heat source station 1. In the operation process, the addition of the heat compensation station 15 in the system does not affect the flow distribution of each heat user 3, and only improves the heat supply capacity of the system shown in fig. 5. The heat replenishing station 15 may be provided on the circulation pipe 4 between the heat source station 1 and the heat consumer 3; or on the circulation pipe 4 between the thermal users 3. The above-described setting method of the heat-up station 15 is applicable to all embodiments of the present invention. In practical application, the regulating valve 8 and the differential pressure control valve 26 are arranged on the circulating pipe 4 between the heat source station 1 and the heat consumer 3 in series; or on the circulation pipe 4 between the thermal users 3.
As shown in fig. 5 a, the heat consumer 3, the circulation pipe 4 is in direct connection with the indoor heat radiation end 20; the user heat exchange device 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a distribution water pump 5 and a confluence three-way flow regulating valve 17. The connection mode of the user heat exchange device 50 is as follows: the outlet end of the distribution water return pipe 7 is connected with the circulating pipe 4; the direct current inlet of the confluence three-way flow regulating valve 17 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6; a bypass inlet of the confluence three-way flow regulating valve 17 is connected with the distribution water return pipe 7 through an outlet end of a bypass pipe 23 and an inlet end of the bypass pipe 23 in sequence; the outlet of the confluence three-way flow control valve 17 is connected with the outlet end of the distribution water supply pipe 6 through the suction end of the distribution water pump 5 and the pressure outlet end of the distribution water pump 5 in sequence. As shown in fig. 5 a, the outlet end of the distribution water supply pipe 6 of the user heat exchange device 50 is connected with the inlet end of the indoor heat dissipation end 20; the inlet end of the distribution water return pipe 7 is connected with the outlet end of the indoor radiating tail end 20.
The confluence three-way flow control valve 17 has the functions of: part of hot water from the outlet end of the indoor heat dissipation tail end 20 sequentially passes through the inlet end of the distribution return pipe 7, the inlet end of the bypass pipe 23, the outlet end of the bypass pipe 23 and the bypass inlet of the confluence three-way flow regulating valve 17, returns into the confluence three-way flow regulating valve 17, is mixed with part of hot water from the upstream circulating pipe 4, sequentially passes through the inlet end of the distribution water supply pipe 6 and the direct-current inlet of the confluence three-way flow regulating valve 17 and also enters the confluence three-way flow regulating valve 17, and realizes the regulation and control of the temperature of the hot water at the inlet end of the indoor heat dissipation tail end 20 (namely, the indoor system water supply temperature of the hot user 3); the other part of the hot water from the outlet end of the indoor heat radiation tail end 20 passes through the inlet end of the distribution return pipe 7, the inlet end of the bypass pipe 23 and the outlet end of the distribution return pipe 7 in sequence and enters the circulating pipe 4; mixing with another part of hot water which is not introduced into the indoor system of the hot user 3, dissipates heat and flows downstream through the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the two portions of hot water are mixed and then continue to flow along the circulation loop 4 to the next hot user 3.
In operation, in order to realize the regulation and control of the hot water flow of the indoor system of the hot user 3, the following methods are provided: i) When the distribution water pump 5 is a fixed-frequency pump, a flow regulating valve is arranged in the user heat exchange device 50, and the connection mode is as follows: besides being arranged on the distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the inlet end of the bypass pipe 23, the distribution water return pipe can also be arranged on the distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the extrusion end of the distribution water pump 5, or on the distribution water supply pipe 6 between the suction end of the distribution water pump 5 and the outlet of the confluence three-way flow regulating valve 17; to ensure that the flow of hot water at the outlet end of the distribution water supply pipe 6 is a preset expected value; namely: the flow of hot water into the indoor radiating end 20 of the hot user 3 is a fixed value.
ii) when the distribution water pump 5 is a variable frequency pump, in order to control the operation frequency of the distribution water pump 5, a differential pressure sensor is arranged in the user heat exchange device 50 and connected in a manner that: the high-pressure measuring point of the differential pressure controller is connected with a distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the extrusion end of the distribution water pump 5, and the low-pressure measuring point of the differential pressure controller is connected with a distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the inlet end of the bypass pipe 23; to ensure that the actual pressure difference between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7 is a preset expected value.
In practical application, the distribution water pump 5 of the user heat exchange device 50 may be mounted on the distribution water return pipe 7 (as shown in fig. 7, a), and in this case, the connection mode of the user heat exchange device 50 is as follows: the extrusion end of the distribution water pump 5 is connected with the circulating pipe 4 through the outlet end of the distribution water return pipe 7; the direct current inlet of the confluence three-way flow regulating valve 17 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6; a bypass inlet of the confluence three-way flow regulating valve 17 is connected with a distribution water return pipe 7 at the pressure outlet end of the distribution water pump 5 through an outlet end of a bypass pipe 23 and an inlet end of the bypass pipe 23 in sequence; the outlet of the confluence three-way flow regulating valve 17 is connected with the outlet end of the distribution water supply pipe 6.
At this time, when the distribution water pump 5 is a fixed-frequency pump, the flow control valve in the user heat exchange device 50 is connected in the following manner: besides being installed on the distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the outlet of the confluence three-way flow control valve 17, the distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the suction end of the distribution water pump 5 or the distribution water return pipe 7 between the press-out end of the distribution water pump 5 and the inlet end of the bypass pipe 23 can be installed. When the distribution water pump 5 is a variable frequency pump, the connection mode of the differential pressure sensor in the user heat exchange device 50 is as follows: the high-pressure measuring point of the differential pressure controller is connected with the distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the outlet of the confluence three-way flow regulating valve 17, and the low-pressure measuring point of the differential pressure controller is connected with the distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the suction end of the distribution water pump 5.
As shown in fig. 5, the user heat exchange device 50 shown in fig. 5 b is different from the user heat exchange device 50 shown in fig. 4 b in embodiment 4 in that: the distribution water pump 5 of the user heat exchange device 50 is arranged on a distribution water return pipe 7 between the water side outlet end of the evaporator 10 and the inlet end of the bypass pipe 23; a buffer tank 41 is provided on the bypass pipe 23 of the user heat exchanging means 50. In operation, the buffer tank 41 functions to make the converging three-way flow control valve 17 regulate and control the temperature of the hot water at the inlet end of the evaporator 10 on the water side more smoothly. The surge tank 41 may be installed on the distribution return pipe 7 between the outlet end of the evaporator 10 on the water side and the suction end of the distribution water pump 5, or on the distribution return pipe 7 between the press-out end of the distribution water pump 5 and the inlet end of the bypass pipe 23.
When the distribution water pump 5 of the user heat exchanger 50 is provided on the distribution water supply pipe 6 between the water-side inlet end of the evaporator 10 and the outlet of the confluence three-way flow control valve 17 (as shown in fig. 4 b), the surge tank 41 may be provided on the bypass pipe 23, or on the distribution water return pipe 7 between the water-side outlet end of the evaporator 10 and the inlet end of the bypass pipe 23. In operation, the working flow of the user heat exchanging device 50 shown in fig. b of fig. 5 and the method for regulating and controlling the hot water flow of the evaporator 10 are the same as those of the user heat exchanging device 50 shown in fig. b of fig. 4 of the embodiment 4.
Example 6
As shown in fig. 6, this embodiment is also a single-pipe heating system, and is used in situations where there is a heating demand. The heat source station 1 in this embodiment is a waste heat recovery device; the connection mode of the heat source station 1 is as follows: the inlet end of the high-temperature side of the waste heat recovery heat exchanger 36 is connected with a water intake pipe 37, and the outlet end of the high-temperature side of the waste heat recovery heat exchanger 36 is connected with a water discharge pipe 38; the inlet end of the low-temperature side of the waste heat recovery heat exchanger 36 is connected with the inlet end B of the heat source station 1, and the outlet end of the low-temperature side of the waste heat recovery heat exchanger 36 is connected with the outlet end A of the heat source station 1. The whole single-pipe heat supply system comprises the following components: a heat source station 1, a circulating pump 2, 2 heat consumers 3 (shown in figures a and b of figure 6), a circulating pipe 4, a return water temperature sensor 22; the connection mode is as follows: the heat source station 1 returns to the heat source station 1 through an outlet end A of the heat source station 1, an inlet end of a circulating pipe 4, a heat consumer 3 shown in a drawing a in figure 6, a heat consumer 3 shown in a drawing B in figure 6, a suction end of a circulating pump 2, an extrusion end of the circulating pump 2, an outlet end of the circulating pipe 4 and an inlet end B of the heat source station 1 in sequence. The circulation pump 2 is a variable frequency pump.
As shown in the diagram a of fig. 6, the circulation pipe 4 is also in direct connection with its indoor heat radiating end 20. The user heat exchanger 50 is composed of a circulating pipe 4, a distribution water supply pipe 6, a distribution water return pipe 7, a distribution water pump 5 and a shunt three-way flow regulating valve 18. The connection mode of the user heat exchange device 50 is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the straight-flow outlet of the flow dividing three-way flow regulating valve 18 is connected with the circulating pipe 4 through the outlet end of the distribution water return pipe 7; the bypass outlet of the shunt three-way flow control valve 18 is connected with the distribution water supply pipe 6 through the inlet end of the bypass pipe 23 and the outlet end of the bypass pipe 23 in sequence; the inlet of the flow dividing three-way flow control valve 18 is connected with the inlet end of the distribution water return pipe 7 through the pressure outlet end of the distribution water pump 5 and the suction end of the distribution water pump 5 in sequence. As shown in fig. 6 a, the outlet end of the distributed water supply pipe 6 of the user heat exchange device 50 is connected with the inlet end of the indoor heat dissipation end 20; the inlet end of the distribution water return pipe 7 is connected with the outlet end of the indoor heat dissipation tail end 20.
During operation, the shunting three-way flow control valve 18 has the following functions: part of hot water from the outlet end of the indoor heat dissipation tail end 20 sequentially passes through the inlet end of the distribution water return pipe 7, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5, the inlet of the distribution three-way flow regulating valve 18, the bypass outlet of the distribution three-way flow regulating valve 18, the inlet end of the bypass pipe 23 and the outlet end of the bypass pipe 23, returns into the distribution water supply pipe 6, and is mixed with part of hot water which comes from the upstream circulating pipe 4 and also enters the distribution water supply pipe 6 through the inlet end of the distribution water supply pipe 6, so that the temperature of the hot water at the inlet end of the indoor heat dissipation tail end 20 is regulated; the other part of the hot water from the outlet end of the indoor heat dissipation tail end 20 sequentially passes through the inlet end of the distribution water return pipe 7, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5, the inlet of the flow dividing three-way flow regulating valve 18, the straight outlet of the flow dividing three-way flow regulating valve 18 and the outlet end of the distribution water return pipe 7 and enters the circulating pipe 4; mixing with another part of the hot water which is not introduced into the indoor system of the hot consumer 3 and flows downstream through the circulation pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the two portions of hot water are mixed and then continue to flow along the circulation loop 4 to the next hot user 3.
In operation, in order to regulate and control the hot water flow of the indoor system of the hot user 3, the user heat exchange device 50 has the following method: i) When the distribution water pump 5 is a fixed-frequency pump, a flow regulating valve is arranged in the user heat exchange device 50, and the connection mode is as follows: besides being arranged on the distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the outlet end of the bypass pipe 23, the distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the suction end of the distribution water pump 5 or the distribution water return pipe 7 between the extrusion end of the distribution water pump 5 and the inlet of the flow dividing three-way flow regulating valve 18 can be arranged to ensure that the hot water flow at the outlet end of the distribution water supply pipe 6 is a preset expected value; namely: the flow of hot water into the indoor radiating end 20 is a fixed value. ii) when the distribution water pump 5 is a variable frequency pump, in order to control the operation frequency of the distribution water pump 5, a differential pressure sensor is arranged in the user heat exchange device 50, and the connection mode is as follows: the high-pressure measuring point of the differential pressure controller is connected with the distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the outlet end of the bypass pipe 23, and the low-pressure measuring point of the differential pressure controller is connected with the distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the suction end of the distribution water pump 5. To ensure the actual pressure difference between the outlet end of the distribution water supply pipe 6 and the inlet end of the distribution water return pipe 7 to be a preset expected value; ensuring the running of the hot water flow of the indoor heat dissipation terminal 20.
In practical applications, the distribution water pump 5 in the user heat exchange device 50 may also be disposed on the distribution water supply pipe 6 between the inlet end of the indoor heat dissipation end 20 and the outlet end of the bypass pipe 23, and the suction end of the distribution water pump 5 is connected to both the outlet end of the bypass pipe 23 and the inlet end of the distribution water supply pipe 6. At this time, the connection mode of the user heat exchange device 50 is as follows: the pressure outlet end of the distribution water pump 5 is connected with the outlet end of the distribution water supply pipe 6; the suction end of the distribution water pump 5 is connected with the circulating pipe 4 through the inlet end of a distribution water supply pipe 6; the straight-flow outlet of the flow-dividing three-way flow regulating valve 18 is connected with the circulating pipe 4 through the outlet end of the distribution water return pipe 7; a bypass outlet of the shunt three-way flow regulating valve 18 is connected with a distribution water supply pipe 6 between the suction end of the distribution water pump 5 and the inlet end of the distribution water supply pipe 6 through an inlet end of a bypass pipe 23 and an outlet end of the bypass pipe 23 in sequence; the inlet of the flow dividing three-way flow regulating valve 18 is connected with the inlet end of the distribution water return pipe 7. In practical application, the outlet end of the distribution water supply pipe 6 of the user heat exchange device 50 is also connected with the inlet end of the indoor heat dissipation terminal 20; the inlet end of the distribution return pipe 7 is also connected with the outlet end of the indoor heat dissipation tail end 20.
At this time, when the distribution water pump 5 is a fixed-frequency pump, the connection mode of the flow control valve in the user heat exchange device 50 is as follows: besides being installed on the distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the inlet of the flow dividing three-way flow regulating valve 18, the distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the extrusion end of the distribution water pump 5 or the distribution water supply pipe 6 between the suction end of the distribution water pump 5 and the outlet end of the bypass pipe 23 can also be installed. When the distribution water pump 5 is a variable frequency pump, the connection mode of the differential pressure sensor in the user heat exchange device 50 is as follows: the high-pressure measuring point of the differential pressure controller is connected with the distribution water supply pipe 6 between the outlet end of the distribution water supply pipe 6 and the extrusion end of the distribution water pump 5, and the low-pressure measuring point of the differential pressure controller is connected with the distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the inlet of the shunt three-way flow regulating valve 18.
As shown in fig. 6, the user heat exchange device 50 shown in fig. 6 b is different from the user heat exchange device 50 shown in fig. 3 b in embodiment 3 in that: i) The distribution water pump 5 of the user heat exchange device 50 is arranged on the distribution water supply pipe 6 between the water side inlet end of the evaporator 10 and the outlet end of the bypass pipe 23; ii) a buffer water tank 41 is arranged on the distribution water return pipe 7 between the water side outlet end of the evaporator 10 of the user heat exchanging device 50 and the inlet of the flow dividing three-way flow regulating valve 18. In operation, the function of the buffer tank 41 is to make the three-way flow control valve 18 regulate and control the temperature of the hot water at the inlet end of the evaporator 10 on the water side more smoothly. The surge tank 41 may also be mounted on the bypass pipe 23. The above-described method of setting the buffer tank 41 is still applicable when the distribution water pump 5 is provided on the distribution return pipe 7 between the water-side outlet end of the evaporator 10 and the inlet of the three-way flow rate adjustment valve 18 (see fig. 3 b). In operation, the working flow of the user heat exchanging device 50 shown in fig. b of fig. 6 and the method for regulating and controlling the hot water flow of the evaporator 10 are the same as those of the user heat exchanging device 50 shown in fig. b of fig. 3 of the embodiment 3.
Example 7
As shown in fig. 7, this embodiment is also a single-pipe heating system, which is used in the situation where there is a heating demand. The heat source station 1 in this embodiment is a geothermal well heat exchange station; the connection mode of the heat source station 1 is as follows: the inlet end of the high-temperature side of the underground water heat exchanger 34 is connected with a submersible pump 35 in the pumping well 31, and the outlet end of the high-temperature side of the underground water heat exchanger 34 is connected with a recharging well 33; the inlet end of the low-temperature side of the underground water heat exchanger 34 is connected with the inlet end B of the heat source station 1, and the outlet end of the low-temperature side of the underground water heat exchanger 34 is connected with the outlet end A of the heat source station 1. The whole single-pipe heating system comprises the following components: a heat source station 1, a circulating pump 2, 2 heat users 3 (shown in figures a and b of figure 7), a circulating pipe 4 and a return water temperature sensor 22; the connection mode is as follows: the heat source station 1 returns to the heat source station 1 through an outlet end A of the heat source station 1, an inlet end of a circulating pipe 4, a heat consumer 3 shown in a diagram a in FIG. 7, a heat consumer 3 shown in a diagram B in FIG. 7, a suction end of a circulating pump 2, a press-out end of the circulating pump 2, an outlet end of the circulating pipe 4, and an inlet end B of the heat source station 1 in sequence. The circulation pump 2 is a variable frequency pump.
As shown in fig. 7 a, the heat consumer 3, the circulation pipe 4 is in direct connection with the indoor heat radiation end 20; the difference between the user heat exchange device 50 shown in the diagram a in fig. 7 and the user heat exchange device 50 shown in the diagram a in fig. 5 in the embodiment 5 is that: the distribution water pump 5 of the user heat exchange device 50 is installed on the distribution water return pipe 7 between the inlet end of the distribution water return pipe 7 and the inlet end of the bypass pipe 23, and the suction end of the distribution water pump 5 is connected with the inlet end of the distribution water return pipe 7. The user heat exchange device 50 shown in the diagram a in fig. 7 can realize all functions of the user heat exchange device 50 shown in the diagram a in fig. 5 of the embodiment 5, and the working flow and the method for regulating and controlling the hot water flow of the indoor system are detailed in the embodiment 5.
As shown in the diagram b of fig. 7, the circulation pipe 4 is indirectly connected to the indoor heat radiation terminal 20 of the heat consumer 3; the difference between the user heat exchange device 50 shown in the diagram b in fig. 7 and the user heat exchange device 50 shown in the diagram b in fig. 3 in the embodiment 3 is that: a preheater 19 is added to the user heat exchange means 50. The connection mode of the preheater 19 in the user heat exchange device 50 is as follows: the inlet end of the high-temperature side of the preheater 19 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6, and the outlet end of the high-temperature side of the preheater 19 is connected with the outlet end of the by-pass pipe 23; the inlet end of the low-temperature side of the preheater 19 is connected with the outlet end of the indoor heat dissipation tail end 20 through an indoor return pipe 25, and the outlet end of the low-temperature side of the preheater 19 is connected with the inlet end of the water side of the condenser 11 through the suction end of an indoor water pump 21 and the pressure end of the indoor water pump 21 in sequence. In practical applications, when the indoor water pump 21 is disposed on the pipe of the water-side outlet end of the condenser 11 of the user heat exchange device 50, the low-temperature-side outlet end of the preheater 19 is connected to the water-side inlet end of the condenser 11, and the other connection relationship of the preheater 19 is not changed. The preheater 19 functions to: the hot water in the circulating pipe 4 from the upstream is used for preheating the indoor system backwater of the heat user 3 so as to reduce the operation energy consumption of the water source heat pump 9.
In the working process, when the preheater 19 preheats the return water, and the temperature of the hot water at the outlet end of the high-temperature side of the preheater 19 is still larger than the highest limit value of the water temperature at the inlet of the evaporator 10, the bypass outlet of the shunt three-way flow regulating valve 18 is opened, so that part of the hot water from the outlet end of the water side of the evaporator 10 returns to the distribution water supply pipe 6 to be mixed with the hot water at the outlet end of the high-temperature side of the preheater 19, and the inlet water temperature of the evaporator 10 is regulated and controlled by the shunt three-way flow regulating valve 18 to be lower than the highest limit value of the inlet water temperature of the evaporator 10; the other part of the hot water from the water side outlet end of the evaporator 10 sequentially passes through the water side outlet end of the evaporator 10, the inlet end of the distribution water return pipe 7, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5, the inlet of the distribution three-way flow regulating valve 18, the straight outlet of the distribution three-way flow regulating valve 18 and the outlet end of the distribution water return pipe 7, enters the circulating pipe 4, dissipates heat without entering the evaporator 10, and is mixed with the other part of the hot water flowing into the downstream through the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the two portions of hot water are mixed and then continuously returned to the heat source station 1 along the circulating pipe 4.
And when the temperature of the hot water at the outlet end of the high-temperature side of the preheater 19 is less than or equal to the maximum limit value of the water temperature at the inlet of the evaporator 10 after the preheater 19 preheats the return water, the bypass outlet of the shunt three-way flow regulating valve 18 is closed. If the hot water flow from the upstream circulating pipe 4 is larger than the hot water flow required by the evaporator 10, a part of hot water in the circulating pipe 4 enters the evaporator 10 to exchange heat under the action of the distribution water pump 5; another part of the hot water is bypassed into the downstream circulating pipe 4 through the circulating pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7. When the flow of the hot water from the upstream circulating pipe 4 is smaller than the flow of the hot water required by the evaporator 10, under the action of the distribution water pump 5, a part of the hot water at the outlet end of the distribution water return pipe 7 returns to the distribution water supply pipe 6 through the circulating pipe 4 between the outlet end of the distribution water return pipe 7 and the inlet end of the distribution water supply pipe 6, and enters the evaporator 10 for heat exchange after being mixed with the hot water from the upstream circulating pipe 4.
Similar to the user heat exchanger 50 shown in fig. 3 b of embodiment 3, the distribution water pump 5 of the user heat exchanger 50 can also be arranged on the distribution water supply pipe 6 between the water-side inlet end of the evaporator 10 and the outlet end of the bypass pipe 23, and the press-out end of the distribution water pump 5 is connected with the water-side inlet end of the evaporator 10. At this time, the connection mode of the preheater 19 in the user heat exchange device 50 is unchanged; the method of regulating the flow of hot water into the evaporator 10 to maintain a steady value during operation is the same as the user heat exchanger unit 50 of example 3, shown in fig. 3 b.
Similarly, for example 4, the user heat exchange device 50 shown in the diagram b of fig. 4 can be further improved by adding a preheater 19 in the system. In this case, the preheater 19 is connected to the user heat exchanger 50 in the following manner: the inlet end of the high-temperature side of the preheater 19 is connected with the circulating pipe 4 through the inlet end of the distribution water supply pipe 6, and the outlet end of the high-temperature side of the preheater 19 is connected with the direct-current inlet of the confluence three-way flow regulating valve 17; the inlet end of the low temperature side of the preheater 19 is connected with the outlet end of the indoor heat dissipation tail end 20, and the outlet end of the low temperature side of the preheater 19 is connected with the inlet end of the water side of the condenser 11. The indoor water pump 21 of the user heat exchange means 50 may also be provided on the water side inlet pipe of the condenser 11 or on the water side outlet pipe of the condenser 11.
Example 8
As shown in fig. 8, this embodiment is also a single-pipe heating system, and is used in the situation where there is a heating demand. The whole single-pipe heat supply system comprises the following components: a heat source station 1, a circulating pump 2, 2 heat consumers 3 (shown in figures a and b of figure 8), a circulating pipe 4 and a backwater temperature sensor 22. The connection mode is as follows: the heat source station 1 is connected with the inlet end B of the heat source station 1 and returns to the heat source station 1 sequentially through the outlet end A of the heat source station 1, the inlet end of the circulating pipe 4, the heat consumer 3 shown in a figure a of figure 8, the heat consumer 3 shown in a figure B of figure 8, the suction end of the circulating pump 2, the extrusion end of the circulating pump 2 and the outlet end of the circulating pipe 4.
The circulating pump 2 is a fixed-frequency pump; during operation, the heat source station 1 adjusts the outlet temperature of the hot water at the outlet end A of the heat source station 1 through the controller thereof, and controls the temperature of the hot water at the outlet end of the circulating pipe 4 within a desired range. The specific control method comprises the following steps: a backwater temperature sensor 22 is provided on the pipe at the outlet end of the circulation pipe 4 for detecting the actual temperature of the heated water at the outlet end of the circulation pipe 4. During working, the actual hot water temperature at the outlet end of the circulating pipe 4 detected by the backwater temperature sensor 22 is transmitted to the controller of the heat source station 1 and compared with the expected hot water temperature value at the outlet end of the circulating pipe 4 set by the controller; according to the comparison result, the controller of the heat source station 1 gives an instruction to regulate the output heat of the heat source station 1 by changing the hot water outlet temperature of the outlet end a of the heat source station 1, so that the actual hot water temperature of the outlet end of the circulation pipe 4 is within a desired range.
As shown in fig. 8, a, the heat consumer 3, the circulation pipe 4 is also indirectly connected to the indoor heat dissipation terminal 20; the difference between the user heat exchange device 50 shown in fig. a in fig. 8 and the user heat exchange device 50 shown in fig. d in fig. 1 of the embodiment 1 is that: two water source heat pumps 9 are connected in series on a water path between the outlet end of the distribution water supply pipe 6 of the user heat exchange device 50 and the inlet end of the distribution water return pipe 7 of the user heat exchange device. The connection mode of the user heat exchange device 50 is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the distribution water return pipe 7 through the water side inlet end and the water side outlet end of an evaporator 10 of one water source heat pump 9, an evaporator communicating pipe between the two water source heat pumps 9 and the water side inlet end and the water side outlet end of the evaporator 10 of the other water source heat pump 9 in sequence; the outlet end of the distribution water return pipe 7 is connected with the circulating pipe 4; an extrusion end of an indoor water pump 21 is connected with an inlet end of the water side of a condenser 11 of another water source heat pump 9 through an inlet end and an outlet end of the water side of the condenser 11 of one water source heat pump 9 and a condenser communicating pipe between the two water source heat pumps 9 in sequence; a resistance valve 16 is provided on the circulation pipe 4 between the inlet end of the distribution supply pipe 6 and the outlet end of the distribution return pipe 7.
The resistance valve 16 is a differential pressure control valve for controlling the differential pressure between the distribution water supply pipe 6 and the distribution water return pipe 7 to ensure the flow of the hot water passing through the evaporator 10 to be stable. In the operation process, under the regulation and control of the resistance valve 16, a part of hot water in the circulating pipe 4 sequentially passes through the inlet end of the distribution water supply pipe 6, the outlet end of the distribution water supply pipe 6 and the water side inlet end of the evaporator 10 of one water source heat pump 9, enters the evaporator 10 of the water source heat pump 9, is subjected to indirect heat exchange with a refrigerant, is cooled for the first time after heat is released, is discharged from the water side outlet end of the evaporator 10 of the water source heat pump 9, sequentially passes through an evaporator communicating pipe and the water side inlet end of the evaporator 10 of the other water source heat pump 9, enters the evaporator 10 of the water source heat pump 9, is subjected to indirect heat exchange with the refrigerant again, is cooled for the second time after heat is released, and sequentially passes through the outlet end of the evaporator 10 of the water source heat pump 9, the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7, and enters the circulating pipe 4; mixing with another part of hot water which is not discharged into the evaporator 10 of the user heat exchange device 50 and flows downstream through the resistance valve 16; the two portions of hot water mix and continue to flow along the circulation loop 4 to the next hot user 3.
When the indoor heat dissipation heat pump device works, indoor system return water from the outlet end of the indoor heat dissipation tail end 20 enters the indoor water pump 21 through the indoor return water pipe 25 to be pressurized, then sequentially passes through the water side inlet end of the condenser 11 of one water source heat pump 9, enters the condenser 11 of the one water source heat pump 9, and carries out indirect heat exchange with refrigerant, the return water obtains heat and is heated for the first time, the return water is discharged from the water side outlet end of the condenser 11 of the one water source heat pump 9, then sequentially passes through the condenser communicating pipe and the water side inlet end of the condenser 11 of the other water source heat pump 9, enters the condenser 11 of the one water source heat pump 9, carries out indirect heat exchange with the refrigerant again, the return water obtains heat and is heated for the second time, and after the temperature reaches the indoor system water supply temperature requirement, sequentially passes through the water side outlet end of the condenser 11 of the one water source heat pump 9, the indoor water supply pipe 24 and the inlet end of the indoor heat dissipation tail end 20, and enters the indoor heat dissipation tail end 20 to supply heat for a user.
Similarly, the indoor water pump 21 may also be disposed at the outlet end of the condenser 11 of the water source heat pump 9, and in this case, the user heat exchanging device 50 is connected as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the distribution water return pipe 7 through the water side inlet end and the water side outlet end of an evaporator 10 of one water source heat pump 9, an evaporator communicating pipe between the two water source heat pumps 9 and the water side inlet end and the water side outlet end of the evaporator 10 of the other water source heat pump 9 in sequence; the outlet end of the distribution water return pipe 7 is connected with the circulating pipe 4; the outlet end of the condenser 11 of one water source heat pump 9 is communicated with the condenser communicating pipe between the two water source heat pumps 9 in sequence, and the inlet end and the outlet end of the water side of the condenser 11 of the other water source heat pump 9 are connected with the suction end of the indoor water pump 21; a resistance valve 16 is provided on the circulation pipe 4 between the inlet end of the distribution supply pipe 6 and the outlet end of the distribution return pipe 7.
In practical application, a distribution water pump 5 can be used to replace the resistance valve 16 in the user heat exchange device 50. In this case, the distribution water pump 5 may be provided on the distribution water supply pipe 6 or the distribution water return pipe 7; while the other parts of the user heat exchange device 50 are connected in the same manner. When the distribution water pump 5 is arranged on the distribution water supply pipe 6, the suction end of the distribution water pump 5 is connected with the inlet end of the distribution water supply pipe 6; when the distribution water pump 5 is arranged on the distribution water return pipe 7, the pressure outlet end of the distribution water pump is connected with the outlet end of the distribution water return pipe 7.
The user heat exchange device 50 shown in the diagram a in fig. 8 is suitable for a heat user using a radiator for heating, because the temperature difference between the supply water and the return water of an indoor system is usually not lower than 20 ℃ when the radiator is used for heating; the temperature difference of the supply water and the return water of a single water source heat pump 9 is generally not higher than 15 ℃, so in order to enable the water source heat pump 9 to operate efficiently, the indoor system return water of the heat consumer 3 needs to be heated in a serial connection mode of two water source heat pumps 9; and the evaporators 10 of the two water source heat pumps 9 are connected in series at the water side, so that the flow of hot water entering the distribution water supply pipe 6 and the distribution water return pipe 7 of the user heat exchange device 50 can be reduced, and the pipe diameters of the distribution water supply pipe 6 and the distribution water return pipe 7 can be reduced.
As shown in fig. 8, diagram b, the heat consumer 3, the circulation pipe 4 is also in indirect connection with its indoor heat dissipation end 20; the difference between the user heat exchange device 50 shown in the diagram b in fig. 8 and the user heat exchange device 50 shown in the diagram c in fig. 1 in the embodiment 1 is that: two water source heat pumps 9 are connected in series on a water path between the outlet end of the distribution water supply pipe 6 of the user heat exchange device 50 and the inlet end of the distribution water return pipe 7 of the user heat exchange device. The connection mode of the user heat exchange device 50 is as follows: the inlet end of the distribution water supply pipe 6 is connected with the circulating pipe 4; the outlet end of the distribution water supply pipe 6 is connected with the inlet end of the distribution water return pipe 7 through the water side inlet end and the water side outlet end of an evaporator 10 of one water source heat pump 9, an evaporator communicating pipe between the two water source heat pumps 9 and the water side inlet end and the water side outlet end of the evaporator 10 of the other water source heat pump 9 in sequence; the outlet end of the distribution water return pipe 7 is connected with the circulating pipe 4; the distribution water pump 5 is arranged on the distribution water supply pipe 6, and the suction end of the distribution water pump 5 is connected with the inlet end of the distribution water supply pipe 6.
The scheme is suitable for high-rise buildings divided into high and low areas, one water source heat pump 9 of the user heat exchange device 50 supplies heat for the high area, the other water source heat pump 9 supplies heat for the low area, but evaporators 10 of the two water source heat pumps 9 are connected in series at the water side; not only the arrangement is simple, but also the hot water flow entering the distribution water supply pipe 6 and the distribution water return pipe 7 can be reduced, which is beneficial to reducing the pipe diameters of the distribution water supply pipe and the distribution water return pipe.
When the flow of hot water from the upstream circulating pipe 4 is larger than that of hot water required by the evaporator 10, under the regulation and control of the distribution water pump 5, a part of hot water in the circulating pipe 4 sequentially passes through the inlet end of the distribution water supply pipe 6, the suction end of the distribution water pump 5, the pressure outlet end of the distribution water pump 5, the outlet end of the distribution water supply pipe 6, the inlet end of the evaporator 10 of one water source heat pump 9, enters the evaporator 10 of the water source heat pump 9, is subjected to indirect heat exchange with a refrigerant, and is cooled for the first time after releasing heat, and is discharged from the outlet end of the evaporator 10 of the water source heat pump 9, and then sequentially passes through an evaporator communicating pipe, the inlet end of the evaporator 10 of the other water source heat pump 9, enters the evaporator 10 of the water source heat pump 9, is subjected to indirect heat exchange with the refrigerant again, and is cooled for the second time after releasing heat, and sequentially passes through the outlet end of the evaporator 10 of the water source heat pump 9, the inlet end of the distribution water return pipe 7 and the outlet end of the distribution water return pipe 7, and enters the circulating pipe 4; mixing with another part of hot water which is not introduced into the evaporator 10 of the user heat exchange device 50, radiates heat, and flows downstream through the circulation pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7; the two parts of hot water are mixed and then continuously flow to the circulating pump 2 along the circulating pipe 4; after being pressurized by the circulating pump 2, the gas passes through the outlet end of the circulating pipe 4 and the inlet end B of the heat source station 1 in sequence and returns to the heat source station 1 to be heated again.
In the working process, the evaporators 10 of the two water source heat pumps 9 of the user heat exchange device 50 respectively absorb heat from the hot water of the circulating pipe 4, and then the respective condensers 11 of the two water source heat pumps 9 respectively heat the indoor system return water respectively served by the two water source heat pumps 9, so as to supply heat to the high area and the low area of a high-rise building. Similarly, the indoor water pump 21 may be installed at the water side inlet end of the condenser 11 of the water source heat pump 9, or at the water side outlet end of the condenser 11 of the water source heat pump 9.
In the operation process, when the flow of the hot water from the upstream circulating pipe 4 is smaller than the flow of the hot water required by the evaporator 10, a part of the hot water discharged from the outlet end of the distribution water return pipe 7 into the downstream circulating pipe 4 returns to the inlet end of the distribution water supply pipe 6, is mixed with the hot water from the upstream circulating pipe 4, then sequentially passes through the inlet end of the distribution water supply pipe 6, the suction end of the distribution water pump 5, the extrusion end of the distribution water pump 5 and the outlet end of the distribution water supply pipe 6, and sequentially enters the evaporators 10 of the two water source heat pumps 9 for heat dissipation.
In practical application, the distribution water pump 5 of the user heat exchange device 50 can also be arranged on the distribution water return pipe 7, and the pressure outlet end of the distribution water pump 5 is connected with the outlet end of the distribution water return pipe 7; the above work process can be completed. In addition, a resistance valve 16 can be used to replace the distribution pump 5; at this time, the resistance valve 16 is provided on the circulation pipe 4 between the inlet end of the distribution water supply pipe 6 and the outlet end of the distribution water return pipe 7. The resistance valve 16 is a pressure difference control valve for controlling the pressure difference between the distribution water supply pipe 6 and the distribution water return pipe 7, and ensuring that the flow of the hot water passing through the evaporator 10 of the water source heat pump 9 is stable and is a set value.
In operation, when the distribution pump 5 is used in the user heat exchange device 50 to adjust the flow rate of hot water entering the evaporator 10, the control method for ensuring the stability of the flow rate of hot water passing through the evaporator 10 is the same as that of the user heat exchange device 50 shown in fig. 1 of embodiment 1.

Claims (10)

1. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), at least one water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a resistance valve (16); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of the evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the resistance valve (16) is arranged on the circulating pipe (4) between the inlet end of the distribution water supply pipe (6) and the outlet end of the distribution water return pipe (7).
2. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), at least one water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a flow regulating valve; the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of an evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the flow regulating valve is arranged on the distribution water supply pipe (6) or the distribution water return pipe (7) and is used for controlling the actual hot water flow at the outlet end of the distribution water supply pipe (6) to be a set expected value.
3. The utility model provides a single tube heating system's user heat transfer device, is including distribution delivery pipe (6), distribution wet return (7), an at least water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a differential pressure sensor; the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of the evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the high-pressure measuring point of the differential pressure sensor is connected with a distribution water supply pipe (6) at the water side inlet end of an evaporator (10) of the water source heat pump (9); the low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe (7) at the water side outlet end of an evaporator (10) of a water source heat pump (9).
4. The utility model provides a single tube heating system's user heat transfer device, is including distribution delivery pipe (6), distribution wet return (7), an at least water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a preheater (19); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of the evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the inlet end of the high-temperature side of the preheater (19) is connected with the circulating pipe (4) through the inlet end of the distribution water supply pipe (6), and the outlet end of the high-temperature side of the preheater (19) is connected with the inlet end of the water side of the evaporator (10) of the water source heat pump (9) through the outlet end of the distribution water supply pipe (6); the outlet end of the low-temperature side of the preheater (19) is connected with the inlet end of the water side of a condenser (11) of the water source heat pump (9).
5. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a confluence three-way flow regulating valve (17); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the direct current inlet of the confluence three-way flow regulating valve (17) is connected with the circulating pipe (4) through the inlet end of the distribution water supply pipe (6), and the bypass current inlet of the confluence three-way flow regulating valve (17) is connected with the distribution water return pipe (7) through the outlet end of the bypass pipe (23) and the inlet end of the bypass pipe (23) in sequence; the outlet of the confluence three-way flow regulating valve (17) is connected with the outlet end of the distribution water supply pipe (6).
6. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a shunt three-way flow regulating valve (18); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the direct-current outlet of the shunt three-way flow regulating valve (18) is connected with the circulating pipe (4) through the outlet end of the distribution water return pipe (7), and the bypass outlet of the shunt three-way flow regulating valve (18) is connected with the distribution water supply pipe (6) through the inlet end of the bypass pipe (23) and the outlet end of the bypass pipe (23) in sequence; the inlet of the flow dividing three-way flow regulating valve (18) is connected with the inlet end of the distribution water return pipe (7).
7. The utility model provides a single tube heating system's user heat transfer device, is including distribution delivery pipe (6), distribution wet return (7), an at least water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a confluence three-way flow regulating valve (17); the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of the evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the direct current inlet of the confluence three-way flow regulating valve (17) is connected with the circulating pipe (4) through the inlet end of the distribution water supply pipe (6), the bypass inlet of the confluence three-way flow regulating valve (17) is connected with the distribution water return pipe (7) through the outlet end of the bypass pipe (23) and the inlet end of the bypass pipe (23) in sequence, and the outlet of the confluence three-way flow regulating valve (17) is connected with the water side inlet end of the evaporator (10) of the water source heat pump (9) through the outlet end of the distribution water supply pipe (6).
8. The utility model provides a single tube heating system's user heat transfer device, includes distribution delivery pipe (6), distribution wet return (7), at least one water resource heat pump (9), water resource heat pump (9) comprise evaporimeter (10), condenser (11), compressor (12) and choke valve (13), characterized by: the user heat exchange device of the single-pipe heat supply system also comprises a circulating pipe (4) and a flow regulating valve (18) of a shunting tee joint; the inlet end of the distribution water supply pipe (6) is connected with the circulating pipe (4); the outlet end of the distribution water return pipe (7) is also connected with the circulating pipe (4); the water source heat pump (9) is arranged on a water path between the outlet end of the distribution water supply pipe (6) and the inlet end of the distribution water return pipe (7) in series, the outlet end of the distribution water supply pipe (6) is connected with the water side inlet end of an evaporator (10) of the water source heat pump (9), and the inlet end of the distribution water return pipe (7) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9); the direct-current outlet of the shunt three-way flow regulating valve (18) is connected with the circulating pipe (4) through the outlet end of the distribution water return pipe (7), the bypass outlet of the shunt three-way flow regulating valve (18) is connected with the distribution water supply pipe (6) through the inlet end of the bypass pipe (23) and the outlet end of the bypass pipe (23) in sequence, and the inlet of the shunt three-way flow regulating valve (18) is connected with the water side outlet end of the evaporator (10) of the water source heat pump (9) through the inlet end of the distribution water return pipe (7).
9. The user heat exchange device of the single-pipe heating system according to any one of claims 7 or 8, wherein a high-pressure measuring point of a pressure difference controller is connected with a distribution water supply pipe (6) at the water side inlet end of an evaporator (10) of a water source heat (9), and a low-pressure measuring point of the pressure difference controller is connected with a distribution water return pipe (7) at the water side outlet end of the evaporator (10) of the water source heat (9).
10. User heat exchanger arrangement according to any of claims 7 or 8, wherein a flow control valve is arranged on the distribution water supply pipe (6) at the water side inlet of the evaporator (10) of the water source heat (9) or on the distribution water return pipe (7) at the water side outlet of the evaporator (10) of the water source heat (9).
CN202211256758.2A 2022-10-06 2022-10-06 User heat exchange device of single-pipe heat supply system Pending CN115493178A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202211256758.2A CN115493178A (en) 2022-10-06 2022-10-06 User heat exchange device of single-pipe heat supply system
CN202322543853.7U CN221146617U (en) 2022-10-06 2023-09-12 User heat exchange device
CN202311198491.0A CN117232035A (en) 2022-10-06 2023-09-12 User heat exchange device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211256758.2A CN115493178A (en) 2022-10-06 2022-10-06 User heat exchange device of single-pipe heat supply system

Publications (1)

Publication Number Publication Date
CN115493178A true CN115493178A (en) 2022-12-20

Family

ID=84474477

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211256758.2A Pending CN115493178A (en) 2022-10-06 2022-10-06 User heat exchange device of single-pipe heat supply system

Country Status (1)

Country Link
CN (1) CN115493178A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115992965A (en) * 2023-02-20 2023-04-21 呼伦贝尔安泰热电有限责任公司海拉尔热电厂 Dynamic adjustment method and related device for heat exchange unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115992965A (en) * 2023-02-20 2023-04-21 呼伦贝尔安泰热电有限责任公司海拉尔热电厂 Dynamic adjustment method and related device for heat exchange unit

Similar Documents

Publication Publication Date Title
CN106196714B (en) Solar energy-ground source heat pump with double buried nest of tubes couples energy supplying system
CN204438368U (en) A kind of water source heat pump air conditioning system
CN201028893Y (en) Ground source heat pump air conditioning system
WO2005119014A1 (en) Remote-heating plant for urban, civil, industrial and agricultural applications
CN106556157B (en) Solar water and recovery system
CN105674449B (en) One kind being based on energy-saving solar air source heat pump combined supply system
CN115493178A (en) User heat exchange device of single-pipe heat supply system
CN101258364B (en) Control device and method, heat pump and heating system comprising the control device
CN101776352A (en) Ground source heat pump system applying system to recover heat and control method thereof
CN104180459A (en) Air conditioning system
CN100578113C (en) A kind of half cascade type heat pump cold and heat supply method and air-conditioning system
CN105674378A (en) Parallel type multi-heat-source series-connection grid-connected heating device
CN220624140U (en) Large-temperature-difference heat supply system
CN221146617U (en) User heat exchange device
CN115468206A (en) Large-temperature-difference heat supply system and control method
CN115405983A (en) Heat pump system, heat pump control system and control method and heat supply network system
CN104633789A (en) Water source heat pump air conditioner system and control method thereof
CN201662280U (en) Earth source heat pump system using system heat recovery
CN107990463A (en) A kind of multi-type air conditioning system of cooling tower and underground pipe Hybrid connections
KR101016717B1 (en) Triple effect heat pump system
CN201215352Y (en) Heat pump system for heating by radiation of compressed steam
CN205481254U (en) Many heats source of run -in heating device that is incorporated into power networks that establishes ties
CN221324574U (en) Heating system
CN218565566U (en) Water mixing unit for heating equipment
CN218033311U (en) High-efficient clean heating system of big difference in temperature of step utilization sewage low-quality heat

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20221220