CN108131765B - Integral single-stage and double-stage heat pump system and control method thereof - Google Patents

Integral single-stage and double-stage heat pump system and control method thereof Download PDF

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Publication number
CN108131765B
CN108131765B CN201810040088.8A CN201810040088A CN108131765B CN 108131765 B CN108131765 B CN 108131765B CN 201810040088 A CN201810040088 A CN 201810040088A CN 108131765 B CN108131765 B CN 108131765B
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heat
air side
circulation loop
water tank
energy storage
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CN108131765A (en
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朱宁
李继民
姜维权
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Beijing Sijitong Energy Technology Co ltd
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Beijing Sijitong Energy Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0003—Exclusively-fluid systems
    • 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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/201—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply
    • 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
    • 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
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • 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
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2021—Storage heaters
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an integral single-stage and double-stage heat pump system and a control method thereof, wherein the integral single-stage and double-stage heat pump system comprises the following components: the air side evaporator, the air side four-way valve, the air side compressor, the condensation-evaporation heat exchanger, the air side condenser, the air side expansion valve and the air side evaporator are connected to form a first circulation loop; the condensation-evaporation heat exchanger is sequentially connected with the water side compressor, the water side condenser, the water side expansion valve and the condensation-evaporation heat exchanger to form a second circulation loop; the water side condenser is sequentially connected with the second channel, the first pipeline and the energy storage water tank, and the energy storage water tank is connected with the energy utilization tail end through the first valve and the second valve and the energy supply water outlet pipeline; the energy-saving tail end of the water-saving device is connected with a first circulating pump, an energy-saving water return pipeline and a water side condenser to form a third circulating loop; the air side condenser is connected with the second circulating water, the energy storage water tank, the second pipeline and the second channel of the air side condenser to form a fourth circulating loop. The invention can ensure that the heat pump system operates in a high-efficiency energy-saving state.

Description

Integral single-stage and double-stage heat pump system and control method thereof
Technical Field
The invention relates to the field of heat pump application, in particular to an integral single-stage and double-stage heat pump system with heating and refrigerating functions and a control method thereof.
Background
The similar heat pump systems in the market are mainly cascade systems. The existing system has the following problems: 1. when the system is used for heating, the system can only run in two stages, cannot be in a single stage, and has low heating energy efficiency ratio; 2. the system can only heat, can not refrigerate, and has single function; 3. when the system is frosted, the heat at the tail end is absorbed, so that the heating comfort is affected; 4. the heat-insulating room is not needed, the problem of freeze prevention is not thoroughly solved, and the water pump, the water tank and the like need to occupy the indoor space of the building.
Disclosure of Invention
The invention provides an integral single-double-stage heat pump system capable of realizing high-temperature heating and low-temperature refrigeration and a control method thereof, which aim to solve the defects in the prior art.
The technical scheme adopted for solving the technical problems is as follows:
an integrated single-stage and double-stage heat pump system comprises a first circulation loop, a second circulation loop, a third circulation loop, a fourth circulation loop, an air side evaporator and a condensation-evaporation heat exchanger;
the air side evaporator is connected with an air side four-way valve, the air side four-way valve is respectively connected with the air side compressor and a first channel of the condensation-evaporation heat exchanger, and the first channel of the condensation-evaporation heat exchanger is sequentially connected with a first channel of the air side condenser, the air side expansion valve and the air side evaporator to form a first circulation loop;
the second channel of the condensing-evaporating heat exchanger is connected with the first channel of the water side condenser through the water side compressor, and the first channel of the water side condenser is connected with the second channel of the condensing-evaporating heat exchanger through the water side expansion valve to form a second circulation loop;
the second channel of the water side condenser is connected with an energy storage water tank through a first pipeline, the energy storage water tank is respectively connected with an energy supply water outlet pipeline through a first valve and a second valve, and the energy supply water outlet pipeline is used for being connected with an energy utilization tail end; the energy utilization tail end is connected with an energy supply water return pipeline through a first circulating pump, and the energy supply water return pipeline is connected with a second channel of the water side condenser to form a third circulating loop;
the second channel of the air side condenser is connected with the energy storage water tank through a second circulating water pump, and the energy storage water tank is connected with the second channel of the air side condenser through a second pipeline to form a fourth circulating loop.
The air side four-way valve comprises four communication ports, namely a communication port A, a communication port B, a communication port C and a communication port D, wherein an outlet of the air side evaporator is connected with the communication port A, the communication port D is connected with an inlet of the air side compressor, an outlet of the air side compressor is connected with the communication port C, and the communication port B is connected with a first channel of the condensation-evaporation heat exchanger.
The energy storage water tank is a layered water tank, and an electric heater is arranged in the energy storage water tank.
The energy storage water tank comprises a shell, an outer sleeve is arranged in the shell, an inner sleeve is arranged in the outer sleeve, a first through hole is formed in the wall of the outer sleeve, a second through hole is formed in the wall of the inner sleeve, a first pipeline sequentially penetrates through the shell and the outer sleeve and stretches into the inner sleeve, and a second pipeline stretches into the inner sleeve along the length direction of the inner sleeve.
The first through holes are formed in a circle along the circumferential direction of the outer sleeve at intervals, a plurality of rows of first through holes are formed in the circle along the length direction of the outer sleeve at intervals, the second through holes are formed in a circle along the circumferential direction of the inner sleeve at intervals, a plurality of rows of second through holes are formed in the circle along the length direction of the inner sleeve at intervals, and the positions of the first through holes and the second through holes are crossed in the length direction.
The condensing-evaporating heat exchanger adopts a plate heat exchanger; the air side condenser adopts a shell-and-tube heat exchanger.
Further, the heat-insulating box body is also included;
an air side four-way valve, an air side compressor, a condensation-evaporation heat exchanger, an air side expansion valve, an air side condenser, a water side compressor, a water side condenser, a water side expansion valve, an energy storage water tank, a first circulating pump, a second circulating pump, a first valve and a second valve are arranged in the heat preservation box body;
an air side evaporator is arranged outside the heat preservation box body.
The first valve and the second valve are electric valves; a first temperature detector is arranged on a pipeline of the water side condenser connected with the first circulating pump; the heat preservation box is internally provided with a second temperature detector and a control cabinet, a control system is arranged in the control cabinet, and a third temperature detector is arranged outside the heat preservation box.
The invention also provides a control method for heating and refrigerating by using the integral single-stage and double-stage heat pump system, which comprises the following steps:
the method comprises the steps that first temperature information is sent to a control system of a control cabinet through a first temperature detector, and the control system controls starting and stopping of a first circulation loop, a second circulation loop, a third circulation loop and a fourth circulation loop according to the received first temperature information;
the control system judges whether the control system operates in two stages or in a single stage according to the set temperature and the received third temperature information, namely, controls the start and stop of the first circulation loop, the second circulation loop, the third circulation loop and/or the fourth circulation loop;
and sending temperature information to a control system of the control cabinet through a fourth temperature detector, wherein the control system controls the start and stop of the electric heater in the energy storage water tank according to the received fourth temperature information.
Compared with the existing cascade heat pump technology, the invention can realize the efficient operation of heating and refrigerating, when heating, the system intelligently controls the single-stage or double-stage operation of the heat pump according to the temperature of the environment, and when the temperature of the environment is lower than the set temperature, the system is operated in double stages; when the ambient temperature is higher than the set temperature, the system operates in a single stage. The heat pump system can be ensured to operate in a high-efficiency energy-saving state. In a refrigeration state, the heat pump system directly provides a cold source for the energy storage water tank through the air side condenser of the system. A sleeve type temperature layering device is arranged in the energy storage water tank of the system, water entering the energy storage water tank enters the inner side of the sleeve, high-temperature water rapidly rises and low-temperature water rapidly falls by utilizing the chimney effect of the sleeve, and therefore a heat source or a cold source required by heat supply or refrigeration is rapidly provided. Meanwhile, the first valve and the second valve of the system water tank are respectively used as a heat source outlet and a cold source outlet, and corresponding switching is automatically performed according to system setting.
Drawings
Fig. 1 is a schematic structural diagram of an integrated single-stage and double-stage heat pump system according to an embodiment of the present invention;
fig. 2 is a schematic system structure diagram of a two-stage operation mode of a heat pump system according to an embodiment of the present invention;
fig. 3 is a schematic system structure diagram of a single-stage operation heating mode of the heat pump system according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a system structure of a defrosting mode of a heat pump system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a system structure of a heat pump system in a refrigeration mode according to an embodiment of the present invention;
FIG. 6 is a schematic view of the layered sleeve of the present invention;
fig. 7 is a perspective view of the internal structure of fig. 6.
In the figure: 1 an air side evaporator, 2 an air side four-way valve, 3 an air side compressor, 4 a condensation-evaporation heat exchanger, 5 an air side expansion valve, 6 an air side condenser, 7 a water side compressor, 8 a water side condenser, 9 a water side expansion valve, 10 an energy storage water tank, 11 a first circulating pump, the system comprises a first pipeline, a second circulating pump, a first valve, a second valve, a control cabinet, a heat-preserving box, an electric heater, a fourth temperature sensor, a second temperature sensor, a first temperature sensor, a third temperature sensor and a first pipeline, wherein the first pipeline is provided with a first pipeline, the second pipeline is provided with a second circulating pump, a first valve, a second valve, a control cabinet, a heat-preserving box, an electric heater, a fourth temperature sensor, a first temperature sensor, a third temperature sensor and a first valve; 24. a second pipe; 25. a housing; 26. an outer sleeve 27. An inner sleeve; 28. first through hole 29. Second through hole.
Detailed Description
The invention is further described below with reference to the accompanying drawings, which are not intended to limit the invention.
Referring to fig. 1, an integrated single-and-double-stage heat pump system includes a first circulation loop, a second circulation loop, a third circulation loop, a fourth circulation loop, an air side evaporator, and a condensing-evaporating heat exchanger;
the air side evaporator is connected with an air side four-way valve, the air side four-way valve is respectively connected with the air side compressor and a first channel of the condensation-evaporation heat exchanger, and the first channel of the condensation-evaporation heat exchanger is sequentially connected with a first channel of the air side condenser, the air side expansion valve and the air side evaporator to form a first circulation loop;
the second channel of the condensing-evaporating heat exchanger is connected with the first channel of the water side condenser through the water side compressor, and the first channel of the water side condenser is connected with the second channel of the condensing-evaporating heat exchanger through the water side expansion valve to form a second circulation loop;
the second channel of the water side condenser is connected with an energy storage water tank through a first pipeline, the energy storage water tank is respectively connected with an energy supply water outlet pipeline through a first valve and a second valve, and the energy supply water outlet pipeline is used for being connected with an energy utilization tail end; the energy utilization tail end is connected with an energy supply water return pipeline through a first circulating pump, and the energy supply water return pipeline is connected with a second channel of the water side condenser to form a third circulating loop;
the second channel of the air side condenser is connected with the energy storage water tank through a second circulating water pump, and the energy storage water tank is connected with the second channel of the air side condenser through a second pipeline to form a fourth circulating loop.
In the first circulation loop, the condensation-evaporation heat exchanger is used as an air side condenser in a system double-stage operation state to externally release heat absorbed by the air side from the air, the heat is transmitted to the second circulation loop in a heat exchange mode, the air side condenser acts in a system single-stage operation heat supply state and a refrigeration mode, and simultaneously, heat required by defrosting is provided when the air side of the system is defrosted. The condensing-evaporating heat exchanger in the heat pump system is used as an air side condenser to release heat absorbed by the air side and is also used as an evaporator of the water side to absorb heat and supply the heat to the water side when the heat pump system is operated in a double-stage mode. When the heat pump system operates in a single-stage mode, the air side condenser in the system directly releases heat absorbed by the air side and transfers the heat to the energy storage water tank.
In the second circulation loop, under the double-stage operation heat supply mode of the system, one side of the condensing-evaporating heat exchanger absorbs heat released by the air side, the heat density is improved under the pressurizing action of the water side compressor, and the water side condenser releases and heats water flowing through the third circulation loop to heat the water.
In the third circulation loop, the heat released by the water extraction side is transferred to the energy utilization end to achieve the purpose of heat supply or refrigeration.
In the fourth circulation loop, heat or cold generated by the air side of the heat pump system is transmitted to the energy storage water tank for standby in the single-stage heating mode or the refrigerating mode of the system. In addition, when the air side of the heat pump system is defrosted, heat in the energy storage water tank is transferred to the air side of the heat pump as defrosting capacity. Avoiding the influence of indoor heating comfort caused by indoor heat.
The present embodiment is based on the above embodiment, the air-side four-way valve 2 includes four communication ports, which are a communication port a, a communication port B, a communication port C, and a communication port D, respectively, the outlet of the air-side evaporator 1 is connected with the communication port a, the communication port D is connected with the inlet of the air-side compressor 3, the outlet of the air-side compressor 3 is connected with the communication port C, and the communication port B is connected with the first passage of the condensation-evaporation heat exchanger 4.
In this embodiment, based on the above embodiment, the energy storage water tank 10 is a layered water tank, and the electric heater 17 is disposed in the energy storage water tank 10.
Preferably, in this embodiment, the tank 10 includes a housing 25, an outer sleeve 26 is disposed in the housing 25, a first through hole 28 is disposed on a wall of the outer sleeve 26, the first pipe 23 penetrates through the housing 25 and extends into the outer sleeve 26, and the second pipe 24 extends into the outer sleeve 26 along a length direction of the outer sleeve 26.
Referring to fig. 1, 6 and 7, the energy storage water tank 9 includes a housing 25, a layered sleeve is provided in the housing, the layered sleeve includes an outer sleeve 26 and an inner sleeve 27, the outer sleeve 26 is provided in the housing 25, the inner sleeve 27 is provided in the outer sleeve 26, a first through hole 28 is provided in the wall of the outer sleeve 25, a second through hole 29 is provided in the wall of the inner sleeve 27, the first pipe 23 sequentially passes through the housing 25 and the outer sleeve 26, and extends into the inner sleeve 27, and the second pipe 24 extends into the inner sleeve 27 along the length direction of the inner sleeve 27.
The invention may also be provided with only one outer sleeve, the inner sleeve being removed, the first conduit 23 extending through the housing 25 into the outer sleeve 26, the second conduit 24 extending into the outer sleeve 26 along the length of the outer sleeve 26.
Preferably, the first through holes 28 are provided at a distance of one turn along the circumferential direction of the outer sleeve 26 to form a row of first through holes, a plurality of rows of first through holes are provided at a distance of one turn along the longitudinal direction of the outer sleeve 26, the second through holes 29 are provided at a distance of one turn along the circumferential direction of the inner sleeve 27 to form a row of second through holes, a plurality of rows of second through holes are provided at a distance of one turn along the longitudinal direction of the inner sleeve 27, and the positions of the row of first through holes and the row of second through holes are disposed to intersect in the longitudinal direction.
The energy storage water tank is a layered energy storage water tank. The layered structure is arranged in the energy storage water tank, so that the layered distribution of the water temperature from bottom to top can be ensured, and the high-temperature heat supply and the low-temperature cold supply are facilitated. An electric heater is further arranged in the energy storage water tank, so that sufficient heat supply can be ensured when defrosting on the air side, and thorough defrosting can be ensured.
Preferably, the condensing-evaporating heat exchanger 4 is a plate heat exchanger; the air side condenser 6 is a shell-and-tube heat exchanger.
Further, the box body 16 is also included;
an air side four-way valve 2, an air side compressor 3, a condensation-evaporation heat exchanger 4, an air side expansion valve 5, an air side condenser 6, a water side compressor 7, a water side condenser 8, a water side expansion valve 9, an energy storage water tank 10, a first circulating pump 11 and a second circulating pump 12 are arranged in the heat preservation box 16;
an air side evaporator is arranged outside the heat preservation box 16;
for ease of control, the first valve 13 and the second valve 14 are disposed outside the incubator 16.
The air side compressor, the condensation-evaporation heat exchanger, the air side condenser, the air side expansion valve, the water side compressor, the water side condenser, the water side expansion valve, the first circulating pump, the second circulating pump, the energy storage water tank and the control system are all arranged in a heat preservation box body, and the air side evaporator is arranged outside the box body to form a whole. The invention can realize high-temperature heating and low-temperature refrigeration and has the advantage of higher energy efficiency of the system. The heat preservation box body is used as a system equipment room and can also be used as a fixed base of the air side evaporator.
For automatic control, the first valve 13 and the second valve 14 are electric valves; a first temperature detector 20 is arranged on a pipeline of the water side condenser 7 connected with the first circulating pump 11; the heat preservation box 16 is internally provided with a second temperature detector 19 and a control cabinet 15, the control cabinet 15 is internally provided with a control system, the heat preservation box 16 is externally provided with a third temperature detector 21, and the energy storage water tank 10 is internally provided with a fourth temperature detector 18.
The control system of the invention is used as a control center for controlling the operation of the heat pump system to automatically operate according to the set conditions. The control cabinet automatically switches the energy supply pipeline switching valve according to the heating or refrigerating mode selected by a user, so that the heat source water in a heating state is ensured to be discharged from the upper part with the highest water temperature of the energy storage water tank, and the cold source water in a refrigerating state is ensured to be discharged from the lower part of the water tank with the lowest water temperature; the control cabinet automatically starts and stops the energy supply state of the heat pump system according to the energy supply backwater temperature measured by the first temperature sensor 20, and automatically switches the single-stage and double-stage operation mode of the heat pump system according to the ambient temperature measured by the third temperature sensor 21 in the heat supply mode.
Referring to fig. 1, the invention provides a control method for heating and refrigerating by using the integrated single-stage and double-stage heat pump system, which comprises the following steps:
the first temperature information is sent to a control system of the control cabinet through the first temperature detector 20, and the control system controls the start and stop of the first circulation loop, the second circulation loop, the third circulation loop and the fourth circulation loop according to the received first temperature information;
the third temperature detector 21 is used for sending third temperature information to a control system of the control cabinet, and the control system judges whether the control system operates in a two-stage mode or a single-stage mode according to the set temperature and the received third temperature information, namely, the control system controls the start and stop of the first circulation loop, the second circulation loop, the third circulation loop and/or the fourth circulation loop;
the temperature information is sent to a control system of the control cabinet through a fourth temperature detector 18, and the control system controls the start and stop of an electric heater in the energy storage water tank 10 according to the received fourth temperature information;
the second temperature detector 19 is used for giving the control system of the control cabinet 15, and the control system controls and starts the electric heater in the heat preservation room according to the received second temperature information, so that the temperature control in the heat preservation room is realized.
The heat pump system can realize the functions of winter heat supply and summer cold supply; in the system heat supply mode, the heat pump system can automatically adjust the single-stage and double-stage operation mode according to the ambient temperature so as to achieve the most energy-saving effect.
Referring to fig. 2, when the first temperature sensor 20 detects that the pipe temperature is lower than the set temperature during the heating mode operation, the control system automatically starts the first circulation pump 11 to operate the third circulation loop to supply heat to the energy consumption end;
at this time, the third temperature sensor 21 detects the ambient temperature, and when the ambient temperature is lower than the set temperature, the control system automatically starts the first circulation loop and the second circulation loop; the air side heat transfer medium absorbs heat from the air through the air side evaporator 1, enters a communication port of the air side four-way valve 2, is pressurized and warmed through the air side compressor 3, then transfers the heat to a second circulation loop through the condensation-evaporation heat exchanger 4, and the heat-dissipating medium reenters the air side evaporator 1 through the air side expansion valve 5 to absorb the heat; the water side heat transfer medium absorbs heat through the condensation-evaporation heat exchanger 4, is pressurized and warmed by the water side compressor 7, enters the water side condenser 8 and transfers the heat to the third circulation loop to supply heat to the energy utilization end, and the circulation operation is performed in this way; in this circulation state, the first valve 13 is opened and the second valve 14 is closed.
Referring to fig. 3, when the third temperature sensor 21 detects that the ambient temperature is higher than the set temperature, the second circulation pump 12 is operated, and the control system automatically starts the first circulation loop and the fourth circulation loop; the air side heat transfer medium absorbs heat from the air through the air side evaporator 1, enters the air side compressor 3 after being pressurized and heated, and then transfers the heat to the fourth circulation loop through the air side condenser 6, and the heat-dissipating medium reenters the air side evaporator 1 through the air side expansion valve 5 to absorb the heat; the heat transfer medium of the fourth circulation loop absorbs heat through the air side condenser 6 and then enters the energy storage water tank 10, and after heat dissipation, the heat transfer medium is provided for the third circulation loop to supply heat to the energy utilization end, so that the circulation operation is performed; in this circulation state, the first valve 13 is opened and the second valve 14 is closed.
Referring to fig. 4, when the defrosting state is entered, the first circulation loop and the fourth circulation loop are operated; heat is transferred from the energy storage water tank 10 to the air side condenser 6 by the heat transfer medium and is circulated back to the energy storage water tank 10 after being transferred to the heat transfer medium of the first circulation loop, and the heat is continuously circulated; the heat transfer medium passing through the first circulation loop of the air side condenser 6 enters the air side compressor 3 according to a path opposite to the heat supply, is pressurized and heated, and then enters the air side evaporator 1 to dissipate heat so as to absorb heat from frost on the surface of the air side evaporator 1 and eliminate the frost; the heat transfer medium after heat release reenters the air side condenser 6 through the air side expansion valve 5 to absorb heat, and the frost on the surface of the air side evaporator 1 is eliminated continuously in the process;
referring to fig. 5, when the cooling mode is entered, the first, third and fourth circulation circuits are operated, the first valve 13 is closed, and the second valve 14 is opened; when the temperature detected by the first temperature sensor 20 is higher than the set temperature, the first circulating pump 11 of the third circulating loop is started, and the heat transfer medium absorbs heat from the energy-using end and is transferred to the energy storage water tank 10 to dissipate heat and cool and then re-enters the energy-using end to absorb heat; simultaneously starting a second circulating pump 12 of the fourth circulating loop, continuously circulating the heat transfer medium between the energy storage water tank 10 and the air side condenser 6, taking heat from the energy storage water tank 10 to the air side condenser 6 and absorbing cold energy to be transmitted to the energy storage water tank 10; meanwhile, the first circulation loop is started, the heat transfer medium in the first circulation loop absorbs heat from the air side condenser 6, enters the communication port of the air side four-way valve 2, enters the air side compressor 3, is pressurized and heated, then is sent to the air side evaporator 1 to emit heat, and then enters the air side condenser 6 to absorb heat after passing through the air side expansion valve 5; the three circulation loops continuously circulate, and the energy-consumption tail end is supplied with cold and radiates heat to the outside until the temperature detected by the first temperature sensor 20 reaches the set stop temperature, and the system is stopped.
The above embodiment is only one of the preferred embodiments of the present invention, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.

Claims (9)

1. An integral single-double-stage heat pump system is characterized by comprising a first circulation loop, a second circulation loop, a third circulation loop, a fourth circulation loop, an air side evaporator and a condensation-evaporation heat exchanger;
the air side evaporator is connected with an air side four-way valve, the air side four-way valve is respectively connected with the air side compressor and a first channel of the condensation-evaporation heat exchanger, and the first channel of the condensation-evaporation heat exchanger is sequentially connected with a first channel of the air side condenser, the air side expansion valve and the air side evaporator to form a first circulation loop;
the second channel of the condensing-evaporating heat exchanger is connected with the first channel of the water side condenser through the water side compressor, and the first channel of the water side condenser is connected with the second channel of the condensing-evaporating heat exchanger through the water side expansion valve to form a second circulation loop;
the second channel of the water side condenser is connected with an energy storage water tank through a first pipeline, the energy storage water tank is respectively connected with an energy supply water outlet pipeline through a first valve and a second valve, and the energy supply water outlet pipeline is used for being connected with an energy utilization tail end; the energy utilization tail end is connected with an energy supply water return pipeline through a first circulating pump, and the energy supply water return pipeline is connected with a second channel of the water side condenser to form a third circulating loop;
the second channel of the air side condenser is connected with an energy storage water tank through a second circulating water pump, and the energy storage water tank is connected with the second channel of the air side condenser through a second pipeline to form a fourth circulating loop;
an electric heater is arranged in the energy storage water tank;
the heat-insulating box body is also included;
an air side four-way valve, an air side compressor, a condensation-evaporation heat exchanger, an air side expansion valve, an air side condenser, a water side compressor, a water side condenser, a water side expansion valve, an energy storage water tank, a first circulating pump and a second circulating pump are arranged in the heat preservation box body;
an air side evaporator is arranged outside the heat preservation box body;
a first temperature detector is arranged on a pipeline of the water side condenser connected with the first circulating pump; the heat preservation box body is internally provided with a second temperature detector and a control cabinet, a control system is arranged in the control cabinet, a third temperature detector is arranged outside the heat preservation box body, and a fourth temperature detector is arranged in the energy storage water tank;
the control method for heating and refrigerating by the integral single-stage and double-stage heat pump system comprises the following steps:
the method comprises the steps that first temperature information is sent to a control system of a control cabinet through a first temperature detector, and the control system controls starting and stopping of a first circulation loop, a second circulation loop, a third circulation loop and a fourth circulation loop according to the received first temperature information;
the control system judges whether the control system operates in a two-stage mode or a single-stage mode according to the set temperature and the received third temperature information, and controls the start and stop of the first circulation loop, the second circulation loop, the third circulation loop and/or the fourth circulation loop;
and sending temperature information to a control system of the control cabinet through a fourth temperature detector, wherein the control system controls the start and stop of the electric heater in the energy storage water tank according to the received fourth temperature information.
2. The integrated single-and-double-stage heat pump system according to claim 1, wherein the air-side four-way valve comprises four communication ports, namely a communication port a, a communication port B, a communication port C and a communication port D, wherein the outlet of the air-side evaporator is connected with the communication port a, the communication port D is connected with the inlet of the air-side compressor, the outlet of the air-side compressor is connected with the communication port C, and the communication port B is connected with the first passage of the condensing-evaporating heat exchanger.
3. The integrated single and dual stage heat pump system of claim 1, wherein the energy storage water tank is a stratified water tank.
4. The integrated single-double-stage heat pump system according to claim 3, wherein the energy storage water tank comprises a shell, an outer sleeve is arranged in the shell, an inner sleeve is arranged in the outer sleeve, a first through hole is formed in the wall of the outer sleeve, a second through hole is formed in the wall of the inner sleeve, the first pipeline sequentially penetrates through the shell and the outer sleeve and stretches into the inner sleeve, and the second pipeline stretches into the inner sleeve along the length direction of the inner sleeve.
5. The integrated single and dual stage heat pump system of claim 4, wherein the first through holes are circumferentially spaced apart from the outer sleeve by a distance of one revolution to form a row of first through holes, wherein the first through holes are circumferentially spaced apart from the outer sleeve by a distance of one revolution, wherein the second through holes are circumferentially spaced apart from the inner sleeve by a distance of one revolution to form a row of second through holes, wherein the second through holes are circumferentially spaced apart from the inner sleeve by a distance of one revolution, and wherein the first through holes and the second through holes are longitudinally interleaved.
6. The integrated single-and-dual-stage heat pump system according to claim 1, wherein the condensing-evaporating heat exchanger is a plate heat exchanger; the air side condenser adopts a shell-and-tube heat exchanger.
7. The integrated single-stage and double-stage heat pump system according to any of claims 1-6, wherein,
the first valve and the second valve are arranged outside the heat insulation box body.
8. The integrated single and dual stage heat pump system of claim 7, wherein the first valve and the second valve are electrically operated valves.
9. A control method for heating and cooling using the integrated single-stage and double-stage heat pump system according to claim 8, characterized in that:
when the first temperature sensor detects that the temperature of the pipeline is lower than the set temperature in the heating mode operation, the control system automatically starts the first circulating pump to operate the third circulating loop to supply heat to the energy utilization end;
at the moment, the third temperature sensor detects the ambient temperature, and when the ambient temperature is lower than the set temperature, the control system automatically starts the first circulation loop and the second circulation loop; the air side heat transfer medium absorbs heat from the air through the air side evaporator, the air side evaporator heats up through the air side compressor, the heat is transferred to the second circulation loop through the condensation-evaporation heat exchanger, and the heat-dissipating medium reenters the air side evaporator through the air side expansion valve to absorb the heat; the water side heat transfer medium absorbs heat through the condensation-evaporation heat exchanger, is pressurized and heated by the water side compressor, enters the water side condenser, transfers the heat to the third circulation loop to supply heat to the energy utilization end, and circularly operates in the way;
when the third temperature sensor detects that the ambient temperature is higher than the set temperature, the second circulating pump operates, and the control system automatically starts the first circulating loop and the fourth circulating loop; the air side heat transfer medium absorbs heat from the air through the air side evaporator, the air side evaporator heats up through the air side compressor, the air side condenser transfers the heat to the fourth circulation loop, and the heat-dissipating medium reenters the air side evaporator through the air side expansion valve to absorb the heat; the heat transfer medium of the fourth circulation loop absorbs heat through the air side condenser and then enters the energy storage water tank, and after heat dissipation, the heat transfer medium is provided for the third circulation loop to supply heat to the energy utilization end, so that the circulation operation is performed;
when entering a defrosting state, the first circulation loop and the fourth circulation loop operate; heat is transmitted from the energy storage water tank to the air side condenser through the heat transfer medium and is transmitted to the heat transfer medium of the first circulation loop, and then the heat is circulated back to the energy storage water tank and continuously circulated; the heat transfer medium passing through the first circulation loop of the air side condenser enters the air side compressor according to a path opposite to the heat supply, is pressurized and heated, and then enters the air side evaporator to dissipate heat so as to absorb heat of frost on the surface of the air side evaporator and eliminate the frost; the heat transfer medium after heat release reenters the air side condenser through the air side expansion valve to absorb heat, and the frost continuously circulated to the surface of the air side evaporator is completely eliminated in the process;
when entering the refrigeration mode, the first, third and fourth circulation loops operate; when the temperature detected by the first temperature sensor is higher than the set temperature, a first circulating pump of the third circulating loop is started, and the heat transfer medium absorbs heat from the energy utilization end and is transferred to the energy storage water tank to dissipate heat and cool and then re-enters the energy utilization end to absorb heat; simultaneously starting a second circulating pump of the fourth circulating loop, continuously circulating the heat transfer medium between the energy storage water tank and the air side condenser, taking heat from the energy storage water tank to the air side condenser, absorbing cold energy and conveying the cold energy to the energy storage water tank; meanwhile, the first circulation loop is started, heat transfer medium in the first circulation loop absorbs heat from the air side condenser, enters the air side compressor, is pressurized and heated, then is sent to the air side evaporator to release heat, and then enters the air side condenser to absorb heat after passing through the air side expansion valve; the three circulation loops continuously circulate, the tail end of the energy consumption is supplied with cold and radiates heat to the outside until the temperature detected by the first temperature sensor reaches the set stop temperature, and the system is stopped.
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CN111637086A (en) * 2020-06-04 2020-09-08 青岛科技大学 Centrifugal compressor air supply system for gas bearing support

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