CN108645028B - Heat accumulating type air source heat pump system suitable for low-temperature environment - Google Patents
Heat accumulating type air source heat pump system suitable for low-temperature environment Download PDFInfo
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- CN108645028B CN108645028B CN201810536855.4A CN201810536855A CN108645028B CN 108645028 B CN108645028 B CN 108645028B CN 201810536855 A CN201810536855 A CN 201810536855A CN 108645028 B CN108645028 B CN 108645028B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- 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
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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Abstract
The invention relates to the field of heating ventilation air conditioners, in particular to a heat accumulating type air source heat pump system suitable for a low-temperature environment. The system comprises an enhanced vapor injection compressor (1), a first water pump (2), a high-temperature heat storage water tank (3), a first water valve (4), a second water valve (6), a second water pump (8), a third water valve (9), a fourth water valve (11), a condenser (13), a first throttle valve (14), a first electromagnetic valve (16), an economizer (17), a second throttle valve (18), an air-cooled evaporator (19), an intermediate heater (20), a second electromagnetic valve (21), a third electromagnetic valve (23), a gas-liquid separator (25), a fifth water valve (27), a sixth water valve (41) and a seventh water valve (42), and can improve the heating capacity of the system in a low-temperature environment, so that the system is efficient and stable to operate, the heat storage density of hot water can be improved, and the volume of a heat accumulator is reduced.
Description
Technical Field
The invention relates to the field of heating ventilation air conditioners, in particular to a heat accumulating type air source heat pump system suitable for a low-temperature environment.
Background
The heating capacity of the air source heat pump is reduced along with the reduction of the outdoor temperature (generally, the air source heat pump is difficult to operate when the ambient temperature is lower than-5 ℃), and the heat load of a building is increased along with the reduction of the outdoor temperature, so that the application of the air source heat pump in a low-temperature environment is greatly limited, although the conventional double-stage compression (enhanced vapor injection) heat pump system can improve the situation, the energy efficiency ratio of the system is still lower, and the heating capacity is still insufficient. The problem of the air source heat pump is not solved well so far, and researchers are urgently needed to solve the problem.
Disclosure of Invention
In order to solve the problem, the invention provides a heat accumulating type air source heat pump system suitable for a low-temperature environment, which can greatly improve the energy efficiency ratio and the heating capacity of the system in the low-temperature environment and ensure the efficient and stable operation of the system.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a heat accumulating type air source heat pump system suitable for a low-temperature environment comprises an enhanced vapor injection compressor, a first water pump, a high-temperature heat accumulating water tank, a first water valve, a second water pump, a third water valve, a fourth water valve, a condenser, a first throttling valve, a first electromagnetic valve, an economizer, a second throttling valve, an air-cooled evaporator, an intermediate heater, a second electromagnetic valve, a third electromagnetic valve, a gas-liquid separator, a fifth water valve, a sixth water valve and a seventh water valve; an exhaust port of the enhanced vapor injection compressor is communicated with an inlet end of a refrigerant channel in the condenser, an outlet end of the refrigerant channel is communicated with an inlet end of a first throttle valve and an inlet end of a first electromagnetic valve at the same time, an outlet end of the first throttle valve is communicated with an inlet end of a medium-pressure channel in the economizer, an outlet end of the medium-pressure channel is communicated with an inlet end of a refrigerant channel in the intermediate heater, an outlet end of the refrigerant channel is communicated with an inlet end of a second electromagnetic valve and an inlet end of a third electromagnetic valve at the same time, an outlet end of the third electromagnetic valve is communicated with an air jet port of the enhanced vapor injection compressor, an outlet end of the first electromagnetic valve is communicated with an inlet end of a high-pressure channel in the economizer, an outlet end of the high-pressure channel is communicated with an inlet end of a second throttle valve, an outlet end of the second, the outlet end of the gas-liquid separator is communicated with the air suction port of the enhanced vapor injection compressor, hot water in the high-temperature heat storage water tank is respectively communicated with the inlet end of the first water pump and the outlet end of the fifth water valve through five through holes, the inlet end of the first water valve, the outlet end of the second water valve and the inlet end of the sixth water valve are communicated, the outlet end of the first water pump is communicated with the inlet end of a hot water channel in the intermediate heater, the outlet end of the hot water channel is communicated with the inlet end of the fifth water valve, the inlet end of the second water pump is communicated with the outlet end of the first water valve and the outlet end of the third water valve, the inlet end of the third water valve is communicated with a heating room, the outlet end of the second water pump is communicated with the inlet end of the hot water channel in the condenser, the outlet end of the hot water channel is communicated with the inlet end of the second water valve and the inlet end of the fourth water valve through a seventh water valve.
The heat accumulating type air source heat pump system suitable for the low-temperature environment further comprises a medium-temperature heat accumulating water tank, a sixth water valve, a seventh water valve and an eighth water valve; a dividing wall type heat exchanger is arranged in the medium-temperature heat storage water tank and is used for exchanging heat between hot water and a refrigerant, the hot water is respectively communicated with the outlet end of a seventh water valve and the inlet end of an eighth water valve through two through holes, the inlet end of the seventh water valve is communicated with the inlet end of a fifth water valve, and the outlet end of the eighth water valve is communicated with the inlet end of a first water pump; the inlet end of the refrigerant channel is communicated with the outlet end of a high-pressure channel in the economizer, the outlet end of the refrigerant channel is communicated with the inlet end of the second throttling valve, and the sixth water valve is arranged on a pipeline between the inlet end of the first water pump and the through hole corresponding to the high-temperature heat storage water tank.
In conclusion, the heat accumulating type air source heat pump system suitable for the low-temperature environment can greatly improve the heating capacity of the system in the low-temperature environment, enables the system to operate efficiently and stably, can also improve the heat accumulating density of hot water, reduces the volume of a heat accumulator, and has the advantages of good effect, low cost, easiness in popularization and the like.
The foregoing is a summary of the present application and thus contains, by necessity, simplifications, generalizations and omissions of detail; those skilled in the art will appreciate that the summary is illustrative of the application and is not intended to be in any way limiting. Other aspects, features and advantages of the devices and/or methods and/or other subject matter described in this specification will become apparent as the description proceeds. The summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
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The above-described and other features of the present application will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. It is to be understood that these drawings are solely for purposes of illustrating several embodiments of the present application and are not intended as a definition of the limits of the application, for which reference should be made to the appended drawings, wherein the disclosure is to be interpreted in a more complete and detailed manner.
Fig. 1 is a schematic view of a heat accumulating type air source heat pump system suitable for a low temperature environment according to a structural form of the present invention.
Fig. 2 is a schematic view of a second structural form of the heat accumulating type air source heat pump system suitable for the low-temperature environment.
Detailed Description
In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, the same/similar reference numerals generally refer to the same/similar parts unless otherwise specified in the specification. The illustrative embodiments described in the detailed description, drawings, and claims should not be considered limiting of the application. Other embodiments of, and changes to, the present application may be made without departing from the spirit or scope of the subject matter presented in the present application. It should be readily understood that the aspects of the present application, as generally described in the specification and illustrated in the figures herein, could be arranged, substituted, combined, designed in a wide variety of different configurations, and that all such modifications are expressly contemplated and made part of this application.
Example 1:
referring to fig. 1, a heat accumulating type air source heat pump system suitable for a low temperature environment comprises an enhanced vapor injection compressor 1, a condenser 13, a first electronic expansion valve 14, an economizer 17, a second electronic expansion valve 18, an air cooling evaporator 19, a gas-liquid separator 25, an intermediate heater 20, a high temperature heat accumulating water tank 3, a first water pump 2, a second water pump 8, a first refrigerant solenoid valve 16, a second refrigerant solenoid valve 21, a third refrigerant solenoid valve 23, a first water path solenoid valve 4, a second water path solenoid valve 6, a third water path solenoid valve 9, a fourth water path solenoid valve 11, a fifth water path solenoid valve 27, a sixth water path solenoid valve 41, a seventh water path solenoid valve 42, a first refrigerant pipeline 15, a second refrigerant pipeline 22, a third refrigerant pipeline 24, a first hot water pipeline 5, a second hot water pipeline 7, a third hot water pipeline 10, a fourth hot water pipeline 12, A fifth hot water pipeline 26 and a sixth hot water pipeline 40, wherein the exhaust port of the enhanced vapor injection compressor 1 is communicated with the inlet end of a refrigerant channel in the condenser 13, the outlet end of the refrigerant channel is simultaneously communicated with the inlet end of the first electronic expansion valve 14 and the inlet end of the first refrigerant pipeline 15, the outlet end of the first electronic expansion valve 14 is communicated with the inlet end of a medium-pressure channel in the economizer 17, the outlet end of the medium-pressure channel is communicated with the inlet end of the refrigerant channel in the intermediate heater 20, the outlet end of the refrigerant channel is simultaneously communicated with the inlet ends of the second refrigerant pipeline 22 and the third refrigerant pipeline 24, the outlet end of the third refrigerant pipeline 24 is communicated with the gas jet port of the enhanced vapor injection compressor 1, the outlet end of the first refrigerant pipeline 15 is communicated with the inlet end of a high-pressure channel in the economizer 17, and the outlet end of the high-pressure, the outlet end of the second electronic expansion valve 18 is communicated with the inlet end of the air-cooled evaporator 19, the outlet end of the air-cooled evaporator 19 is simultaneously communicated with the outlet end of the second refrigerant pipeline 22 and the inlet end of the gas-liquid separator 25, the outlet end of the gas-liquid separator 25 is communicated with the air suction port of the enhanced vapor injection compressor 1, hot water in the high-temperature heat storage water tank 3 is respectively communicated with the inlet end of the first water pump 2, the outlet end of the fifth hot water pipeline 26, the inlet end of the first hot water pipeline 5, the outlet end of the second hot water pipeline 7 and the inlet end of the sixth hot water pipeline 40 through five through holes, the outlet end of the first water pump 2 is communicated with the inlet end of the hot water channel in the intermediate heater 20, the outlet end of the hot water channel is communicated with the inlet end of the fifth hot water pipeline 26, the inlet end of the second, an inlet end of a third hot water pipeline 10 is communicated with a heating room, an outlet end of a second water pump 8 is communicated with an inlet end of a hot water channel in a condenser 13, an outlet end of the hot water channel is respectively communicated with an inlet end of a second hot water pipeline 7 and an inlet end of a fourth hot water pipeline 12 through a seventh water solenoid valve 42, an outlet end of the fourth hot water pipeline 12 is communicated with the heating room, a first refrigerant solenoid valve 16 is arranged on a first refrigerant pipeline 15, a second refrigerant solenoid valve 21 is arranged on a second refrigerant pipeline 22, a third refrigerant solenoid valve 23 is arranged on a third refrigerant pipeline 24, a first water solenoid valve 4 is arranged on a first hot water pipeline 5, a second water solenoid valve 6 is arranged on the second hot water pipeline 7, a third water solenoid valve 9 is arranged on the third hot water pipeline 10, and a fourth water solenoid valve 11 is arranged on the fourth hot water pipeline 12, a fifth water solenoid valve 27 is provided on the fifth hot water line 26, and a sixth water solenoid valve 41 is provided on the sixth hot water line 40. The high-temperature hot-water storage tank 3 may be a tank having a function of preventing the mixture of cold and hot water.
The working principle of the system is as follows:
1) when the outdoor environment temperature is higher than the first balance point temperature (such as-3 ℃), the working principle of the system consists of a heat supply and storage process and a pure heat supply process, and the working principle specifically comprises the following steps:
1.1) when the temperature of water in the high-temperature heat storage water tank 15 is lower than a set value (such as 60 ℃), starting the heat supply and heat storage process, and controlling the valves as follows: the first refrigerant solenoid valve 16, the first water solenoid valve 4, the second water solenoid valve 6, the third water solenoid valve 9, the fourth water solenoid valve 11 and the seventh water solenoid valve 42 are opened, the first electronic expansion valve 14, the second refrigerant solenoid valve 21, the third refrigerant solenoid valve 23, the fifth water solenoid valve 27 and the sixth water solenoid valve 41 are closed, the second electronic expansion valve 18 is normally operated, and the refrigerant flow is as follows: the air injection enthalpy increasing compressor 1 → the condenser 13 (releasing heat) → the first refrigerant electromagnetic valve 16 → the economizer 17 → the second electronic expansion valve 18 (throttling) → the air cooling evaporator 19 (absorbing heat) → the gas-liquid separator 25 → the air injection enthalpy increasing compressor 1, the heating return water, together with the water in the high temperature heat storage water tank 3, is pressurized by the second water pump 8 and then enters the condenser 13, is heated by the high temperature refrigerant and then returns to the high temperature heat storage water tank 3 and the fourth hot water pipe 12 (enters the heating room), respectively.
1.2) when the water temperature in the high-temperature heat storage water tank 15 reaches a set value, starting a pure heat supply process, and controlling each valve as follows: the first refrigerant electromagnetic valve 16, the third water solenoid valve 9, the fourth water solenoid valve 11 and the seventh water solenoid valve 42 are opened, the first electronic expansion valve 14, the second refrigerant electromagnetic valve 21, the third refrigerant electromagnetic valve 23, the first water solenoid valve 4, the second water solenoid valve 6, the fifth water solenoid valve 27 and the sixth water solenoid valve 41 are closed, the second electronic expansion valve 18 normally operates, the flow of the refrigerant is the same as that in the heat supply and heat storage process, the heating return water is pressurized by the second water pump 8 and then enters the condenser 13, and the heating return water is heated by the high-temperature refrigerant and then returns to the fourth hot water pipeline 12 (enters the heating room).
2) When the outdoor environment temperature is lower than the first balance point temperature, the working principle of the system consists of a high-temperature hot water heat supply process, a medium-temperature hot water enhanced vapor injection heat supply process, a low-temperature hot water source heat pump heat supply process and a common enhanced vapor injection heat supply process in sequence, and the method specifically comprises the following steps:
2.1) during the high-temperature hot water heat supply process, the control of each valve is as follows: the enhanced vapor injection compressor 1 is closed, namely the heat pump unit stops working, namely all the refrigerant electromagnetic valves and the electronic expansion valves are closed, the second water path electromagnetic valve 6, the third water path electromagnetic valve 9, the fourth water path electromagnetic valve 11 and the sixth water path electromagnetic valve 41 are opened, the first water path electromagnetic valve 4, the fifth water path electromagnetic valve 27 and the seventh water path electromagnetic valve 42 are closed, heating backwater enters the high-temperature heat storage water tank 3 through the third water path electromagnetic valve 9, the second water pump 8 and the sixth water path electromagnetic valve 41, and high-temperature hot water coming out of the high-temperature heat storage water tank 3 enters a heating room through the second water path electromagnetic valve 6 and the fourth water path electromagnetic valve 11 to heat the room.
2.2) when the temperature of the water in the high-temperature heat storage water tank 15 is reduced to 40 ℃, starting the injection enthalpy-increasing heat supply process of the medium-temperature hot water, and controlling the valves as follows: the first refrigerant electromagnetic valve 16, the third refrigerant electromagnetic valve 23, the third water path electromagnetic valve 9, the fourth water path electromagnetic valve 11, the fifth water path electromagnetic valve 27 and the seventh water path electromagnetic valve 42 are opened, the second refrigerant electromagnetic valve 21, the first water path electromagnetic valve 4, the second water path electromagnetic valve 6 and the sixth water path electromagnetic valve 41 are closed, the first electronic expansion valve 14 and the second electronic expansion valve 18 normally operate, the refrigerant flow path is based on the heat supply and heat storage process, the refrigerant from the condenser 13 is divided into two paths, one path is throttled by the first electronic expansion valve 14 and then enters the medium pressure coil of the economizer 17 to absorb the heat of the other path of high pressure refrigerant, the refrigerant enters the intermediate heater 20 to absorb the heat from the medium temperature hot water in the high temperature heat storage water tank 3 and then enters the air jet port of the jet increasing enthalpy compressor 1 by the third refrigerant electromagnetic valve 23, the other path of refrigerant exits from the economizer 17 and then throttles by the second electronic expansion valve 18 and enters the air cooling evaporator 19, the heat absorbed by the outdoor air is evaporated into gas, and the gas returns to the air suction port of the enhanced vapor injection compressor 1 through the gas-liquid separator 25; the medium temperature hot water in the high temperature heat storage water tank 3 is pressurized by the first water pump 2 and then enters the intermediate heater 20, and the medium temperature refrigerant is heated and then returns to the high temperature heat storage water tank 3 through the fifth water path electromagnetic valve 27; the heating return water is pressurized by the second water pump 8, then enters the condenser 13, is heated by the high-temperature refrigerant, and then returns to the fourth hot water pipeline 12 (enters the heating room).
2.3) when the temperature of the water in the high-temperature heat storage water tank 3 is reduced to 20 ℃, starting the heat supply process of the low-temperature hot water source heat pump, and compared with the injection enthalpy addition heat supply process of the medium-temperature hot water, the difference of the process is that the second refrigerant electromagnetic valve 21 is opened, the first refrigerant electromagnetic valve 16, the third refrigerant electromagnetic valve 23 and the second electronic expansion valve 18 are closed, and the flow of the refrigerant is as follows: enhanced vapor injection compressor 1 → condenser 13 (discharge heat) → first electronic expansion valve 14 (throttle) → economizer 17 → intermediate heater 20 (absorption heat) → second refrigerant solenoid valve 21 → gas-liquid separator 25 → enhanced vapor injection compressor 1; the low-temperature hot water in the high-temperature heat storage water tank 3 is pressurized by the first water pump 2 and then enters the intermediate heater 20, and the low-temperature refrigerant is heated and then returns to the high-temperature heat storage water tank 3 through the fifth water path electromagnetic valve 27; the heating return water is pressurized by the second water pump 8, then enters the condenser 13, is heated by the high-temperature refrigerant, and then returns to the fourth hot water pipeline 12 (enters the heating room).
2.4) when the temperature of the water in the high-temperature heat storage water tank 15 is reduced to 0 ℃ or slightly frozen, switching to a common enhanced vapor injection heating process, wherein the control of each valve in the process is different from that in the intermediate-temperature hot water enhanced vapor injection heating process in that a fifth water path electromagnetic valve 27 is closed and the flow of the refrigerant is the same; the heating return water is pressurized by the second water pump 8, then enters the condenser 13, is heated by the high-temperature refrigerant, and then returns to the fourth hot water pipeline 12 (enters the heating room).
In the embodiment, cold water in the high-temperature heat storage water tank 3 is used for storing redundant heating quantity when the outdoor environment temperature of the heat pump unit is higher than the first balance point temperature, and after the water temperature is heated to a set value (about 60 ℃), the pure heating process is switched; when the outdoor environment temperature is lower than the first balance point temperature, the hot water in the high-temperature heat storage water tank 3 is subjected to a high-temperature hot water heat supply process, a medium-temperature hot water enhanced vapor injection heat supply process and a low-temperature hot water source heat pump heat supply process in sequence from high to low according to the temperature. According to the embodiment, the hot water in the high-temperature heat storage water tank 3 is utilized in a grading manner from high to low according to the temperature, the energy efficiency ratio of the unit at the low temperature can be greatly improved, the heating capacity can meet the requirement, the heat storage density of the hot water is improved, and the volume of the high-temperature heat storage water tank 3 is reduced.
When the heat pump system is applied to a factory, a market, an office building and the like, which only have heat load in the daytime and no heat load at night, the system can utilize off-peak electricity at night for heat storage, and hot water in the high-temperature heat storage water tank 3 is utilized in a grading manner when the heat load is in the daytime. Compared with the heat supply and heat storage process, the heat storage process utilizing the night off-peak electricity has the difference of valve control that the third water path electromagnetic valve 9 and the fourth water path electromagnetic valve 11 are closed, the flow of the refrigerant is the same, the hot water in the high-temperature heat storage water tank 3 is pressurized by the first water path electromagnetic valve 4 and the second water pump 8 and then enters the condenser 13 to be heated by the high-temperature refrigerant, and the discharged refrigerant returns to the heat storage water tank 3 through the seventh water path electromagnetic valve 42 and the second water path electromagnetic valve 6. An electric heating rod can be arranged in the high-temperature heat storage water tank 3, when the heat pump system heats the water in the high-temperature heat storage water tank 3 to 60 ℃, the electric heating rod is started to continue heating, and when the water temperature reaches 80 ℃, the heating is stopped. Utilize the low ebb electricity at night to drive heat pump system and electric heating rod for heat accumulation water tank 3 heat accumulation, can improve the economic nature of system, make the system more energy-conserving.
Example 2:
referring to fig. 2, in this embodiment, on the basis of embodiment 1, the system further includes a medium temperature heat storage water tank 35, a sixth water path solenoid valve 28, a seventh water path solenoid valve 29, an eighth water path solenoid valve 30, a seventh hot water pipeline 31, and an eighth hot water pipeline 32, a dividing wall type heat exchanger is disposed in the medium temperature heat storage water tank 35 for heat exchange between hot water and refrigerant, hot water in the medium temperature heat storage water tank 35 is respectively communicated with an outlet end of the seventh hot water pipeline 31 and an inlet end of the eighth hot water pipeline 32 through two through holes, an inlet end of the seventh hot water pipeline 31 is communicated with an outlet end of the fifth hot water pipeline 26, an outlet end of the eighth hot water pipeline 32 is communicated with an inlet end of the first water pump 2, an outlet end of a high pressure channel in the economizer 17 is communicated with an inlet end of the second electronic expansion valve 18, an inlet end of a refrigerant channel in the medium temperature, the outlet end of the refrigerant passage in the intermediate temperature hot water storage tank 35 communicates with the inlet end of the refrigerant passage in the intermediate heater 20, a seventh water path solenoid valve 29 is provided on a seventh hot water line 31, an eighth water path solenoid valve 30 is provided on an eighth hot water line 32, and a sixth water path solenoid valve 28 is provided on a line connecting the inlet end of the first water pump 2 and the through hole corresponding to the high temperature hot water storage tank 3.
Compared with the working principle of the system in the embodiment 1, the difference is that:
1) when the heat supply and storage and pure heat supply processes are operated, the seventh water path electromagnetic valve 29 and the eighth water path electromagnetic valve 30 are closed, the refrigerant from the high-pressure channel of the economizer 17 enters the medium-temperature heat storage water tank 35 to heat the hot water in the medium-temperature heat storage water tank, and the super-cooling heat of the refrigerant is stored in the hot water;
2) when the high-temperature hot water heating process is operated, the seventh and eighth water solenoid valves 29 and 30 are closed, and the other operations are the same as those of the high-temperature hot water heating process of embodiment 1;
3) after the high-temperature hot water heat supply process is finished, the working principle of the system sequentially comprises the following operation modes:
3.1) in the first operation mode, the medium-temperature hot water in the medium-temperature heat storage water tank 35 is used as a medium-temperature heat source, the seventh water path electromagnetic valve 29 and the eighth water path electromagnetic valve 30 are opened, the fifth water path electromagnetic valve 27 and the sixth water path electromagnetic valve 28 are closed, the refrigerant flow is the same as that in the embodiment 1, the medium-temperature hot water in the medium-temperature heat storage water tank 35 is pressurized by the eighth water path electromagnetic valve 30 and the first water pump 2 and then enters the intermediate heater 20 to heat the medium-temperature refrigerant, the discharged hot water returns to the medium-temperature heat storage water tank 35 by the seventh water path electromagnetic valve 29, and when the water temperature is reduced to 20 ℃, the operation mode is switched to the second operation mode;
3.2) the second operation mode takes the low-temperature hot water in the medium-temperature heat storage water tank 35 as a low-temperature heat source, the seventh water solenoid valve 29 and the eighth water solenoid valve 30 are opened, the fifth water solenoid valve 27 and the sixth water solenoid valve 28 are closed, the refrigerant flow is the same as that of the embodiment 1, the low-temperature hot water in the medium-temperature heat storage water tank 35 is pressurized by the eighth water solenoid valve 30 and the first water pump 2 and then enters the intermediate heater 20 to heat the low-temperature refrigerant, the discharged hot water returns to the medium-temperature heat storage water tank 35 by the seventh water solenoid valve 29, and when the water temperature is reduced to 5 ℃, the operation mode is switched to the third operation mode;
3.3) the third operation mode uses the medium temperature hot water in the high temperature heat storage water tank 3 as the medium temperature heat source, compared with the process of the embodiment 1, the difference is that the high pressure refrigerant (with the temperature of about 20 ℃) from the economizer 17 enters the medium temperature heat storage water tank 35 to heat the cold water therein, the flow of the refrigerant is the same as that of the embodiment 1, and when the water temperature is reduced to 20 ℃, the operation mode is switched to the fourth operation mode;
3.4) the fourth operation mode takes the low-temperature hot water in the high-temperature heat storage water tank 3 as a low-temperature heat source, the specific process is the same as that in the embodiment 1, and when the temperature of the water is reduced to 5 ℃, the operation mode is switched to the fifth operation mode;
3.5) the fifth operation mode is consistent with the second operation mode, and when the water temperature is reduced to 5 ℃, the normal enhanced vapor injection heating process is switched.
In this embodiment, the medium-temperature heat storage water tank 35 is added on the basis of embodiment 1, and is used for storing the overcooling heat of the refrigerant coming out of the condenser 13, and when the outdoor environment temperature is lower than the first equilibrium point temperature, the heat of the hot water in the medium-temperature heat storage water tank 35 is utilized to heat the heating return water according to the quality.
In conclusion, the invention can greatly improve the heating capacity of the system in a low-temperature environment, enables the system to operate efficiently and stably, can also improve the heat storage density of hot water, reduces the volume of the heat accumulator, and has the advantages of good effect, low cost, easy popularization and the like.
The foregoing has been a detailed description of various embodiments of the apparatus and/or methods of the present application via block diagrams, flowcharts, and/or examples of implementations. When the block diagrams, flowcharts, and/or embodiments include one or more functions and/or operations, it will be understood by those within the art that each function and/or operation within the block diagrams, flowcharts, and/or embodiments can be implemented, individually and/or collectively, by a wide range of hardware, software, firmware, or virtually any combination thereof. However, those skilled in the art will recognize that some aspects of the embodiments described in this specification can be equivalently implemented in whole or in part in integrated circuits, in the form of one or more computer programs running on one or more computers (e.g., in the form of one or more computer programs running on one or more computer systems), in the form of one or more programs running on one or more processors (e.g., in the form of one or more programs running on one or more microprocessors), in the form of firmware, or in virtually any combination thereof, and, it is well within the ability of those skilled in the art to design circuits and/or write code for use in the present application, software and/or firmware, in accordance with the teachings disclosed herein. In addition, those skilled in the art will appreciate that the mechanisms of the subject matter described in this specification are capable of being distributed as a program product in a variety of forms, regardless of the type of signal bearing media used to actually carry out the distribution, and that an illustrative embodiment of the subject matter described in this specification applies. For example, signal bearing media include, but are not limited to, the following: recordable type media such as floppy disks, hard disks, Compact Disks (CDs), Digital Video Disks (DVDs), digital tape, computer memory, etc.; a transmission type medium such as a digital and/or an analog communication medium (e.g., a fiber optic cable, a waveguide, a wired communications link, a wireless communication link, etc.).
Those skilled in the art will recognize that it is common within the art to describe devices and/or methods in the manner described in this specification and then to perform engineering practices to integrate the described devices and/or methods into a data processing system. That is, at least a portion of the devices and/or methods described herein may be integrated into a data processing system through a reasonable amount of experimentation. Those skilled in the art will recognize that a typical data processing system will typically include one or more of the following: a system unit housing, a video display device, memory such as volatile and non-volatile memory, processors such as microprocessors and digital signal processors, computing entities such as operating systems, drivers, graphical user interfaces, and applications, one or more interaction devices such as a touch pad or screen, and/or a control system including feedback loops and control motors (e.g., feedback to detect position and/or velocity; control motors to move and/or adjust components and/or size). A typical data processing system may be implemented using any suitable commercially available components such as those typically found in data computing/communication and/or network computing/communication systems.
With respect to substantially any plural and/or singular terms used in this specification, those skilled in the art may interpret the plural as singular and/or the singular as plural as appropriate from a context and/or application. Various singular/plural combinations may be explicitly stated in this specification for the sake of clarity.
Various aspects and embodiments of the present application are disclosed herein, and other aspects and embodiments of the present application will be apparent to those skilled in the art. The various aspects and embodiments disclosed in this application are presented by way of example only, and not by way of limitation, and the true scope and spirit of the application is to be determined by the following claims.
Claims (2)
1. A heat accumulating type air source heat pump system suitable for a low-temperature environment is characterized by comprising an enhanced vapor injection compressor (1), a first water pump (2), a high-temperature heat accumulating water tank (3), a first water valve (4), a second water valve (6), a second water pump (8), a third water valve (9), a fourth water valve (11), a condenser (13), a first throttle valve (14), a first electromagnetic valve (16), an economizer (17), a second throttle valve (18), an air-cooled evaporator (19), an intermediate heater (20), a second electromagnetic valve (21), a third electromagnetic valve (23), a gas-liquid separator (25), a fifth water valve (27), a sixth water valve (41) and a seventh water valve (42); the exhaust port of the enhanced vapor injection compressor (1) is communicated with the inlet end of a refrigerant channel in a condenser (13), the outlet end of the refrigerant channel is simultaneously communicated with the inlet end of a first throttle valve (14) and the inlet end of a first electromagnetic valve (16), the outlet end of the first throttle valve (14) is communicated with the inlet end of a medium-pressure channel in an economizer (17), the outlet end of the medium-pressure channel is communicated with the inlet end of the refrigerant channel in an intermediate heater (20), the outlet end of the refrigerant channel is simultaneously communicated with the inlet end of a second electromagnetic valve (21) and the inlet end of a third electromagnetic valve (23), the outlet end of the third electromagnetic valve (23) is communicated with the jet orifice of the enhanced vapor injection compressor (1), the outlet end of the first electromagnetic valve (16) is communicated with the inlet end of a high-pressure channel in the economizer (17), and the outlet end of the high-pressure channel is communicated, the outlet end of the second throttle valve (18) is communicated with the inlet end of the air-cooled evaporator (19), the outlet end of the air-cooled evaporator (19) is simultaneously communicated with the outlet end of the second electromagnetic valve (21) and the inlet end of the gas-liquid separator (25), the outlet end of the gas-liquid separator (25) is communicated with the air suction port of the enhanced vapor injection compressor (1), hot water in the high-temperature heat storage water tank (3) is respectively communicated with the inlet end of the first water pump (2), the outlet end of the fifth water valve (27), the inlet end of the first water valve (4), the outlet end of the second water valve (6) and the inlet end of the sixth water valve (41) through five through holes, the outlet end of the first water pump (2) is communicated with the inlet end of a hot water channel in the intermediate heater (20), the outlet end of the hot water channel is communicated with the inlet end of the fifth water valve (27), the inlet end of the second water pump (8) is simultaneously communicated with the outlet end, the inlet end of the third water valve (9) is communicated with a heating room, the outlet end of the second water pump (8) is communicated with the inlet end of a hot water channel in the condenser (13), the outlet end of the hot water channel is respectively communicated with the inlet end of the second water valve (6) and the inlet end of the fourth water valve (11) through a seventh water valve (42), and the outlet end of the fourth water valve (11) is communicated with the heating room.
2. A heat accumulating type air source heat pump system suitable for low temperature environment according to claim 1, characterized in that the system further comprises a medium temperature heat accumulating water tank (35), a sixth water valve (28), a seventh water valve (29), an eighth water valve (30); a dividing wall type heat exchanger is arranged in the medium-temperature heat storage water tank (35) and is used for exchanging heat between hot water and a refrigerant, the hot water is respectively communicated with the outlet end of a seventh water valve (29) and the inlet end of an eighth water valve (30) through two through holes, the inlet end of the seventh water valve (29) is communicated with the inlet end of a fifth water valve (27), and the outlet end of the eighth water valve (30) is communicated with the inlet end of a first water pump (2); the inlet end of the refrigerant channel is communicated with the outlet end of a high-pressure channel in the economizer (17), the outlet end of the refrigerant channel is communicated with the inlet end of a second throttle valve (18), and a sixth water valve (28) is arranged on a pipeline between the inlet end of the first water pump (2) and a through hole corresponding to the high-temperature heat storage water tank (3).
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| CN201810536855.4A CN108645028B (en) | 2018-05-30 | 2018-05-30 | Heat accumulating type air source heat pump system suitable for low-temperature environment |
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| CN201810536855.4A CN108645028B (en) | 2018-05-30 | 2018-05-30 | Heat accumulating type air source heat pump system suitable for low-temperature environment |
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| CN108645028B true CN108645028B (en) | 2020-10-02 |
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| CN109780748B (en) * | 2019-03-14 | 2021-04-06 | 哈尔滨工业大学 | Air-supplementing type ultralow-loop-temperature air source heat pump unit and heating and refrigerating operation method thereof |
| CN109780749B (en) * | 2019-03-14 | 2020-11-10 | 哈尔滨工业大学 | Ultralow-loop-temperature air source heat pump unit for balancing outdoor temperature day difference by utilizing heat storage |
| CN115200223B (en) * | 2022-07-26 | 2023-10-24 | 大同云清科技有限公司 | Ventilation air heat pump system for improving power of compressor |
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| US4452620A (en) * | 1980-03-07 | 1984-06-05 | Rene Dosmond | Installation for central heating and/or for the production of hot water for sanitary or industrial purposes |
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| CN108645028A (en) | 2018-10-12 |
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