CN114484932A - Heat pump system, control method and air conditioner - Google Patents

Heat pump system, control method and air conditioner Download PDF

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Publication number
CN114484932A
CN114484932A CN202210126191.0A CN202210126191A CN114484932A CN 114484932 A CN114484932 A CN 114484932A CN 202210126191 A CN202210126191 A CN 202210126191A CN 114484932 A CN114484932 A CN 114484932A
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China
Prior art keywords
heat
refrigerant
water
pump system
line
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CN202210126191.0A
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Chinese (zh)
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CN114484932B (en
Inventor
方金升
梁祥飞
徐箐
周孙希
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • 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
    • F24F5/0007—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 cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • F24F5/0007—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 cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0017—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 cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
    • F24F5/0021—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 cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice using phase change material [PCM] for storage
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • 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
    • F25B41/40—Fluid line arrangements
    • 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
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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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)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention belongs to the technical field of heat pumps, and relates to a heat pump system, a control method and an air conditioner, wherein the heat pump system comprises an outdoor heat exchanger with a first refrigerant pipeline and a first water pipeline, and a heat storage unit with a second refrigerant pipeline and a second water pipeline, wherein the first water pipeline and the second water pipeline are communicated to form a water circulation loop; the compressor, the first refrigerant line and the indoor heat exchanger form a first refrigerant circulation circuit, and the compressor, the first refrigerant line and the second refrigerant line form a second refrigerant circulation circuit. The heat of condensation in summer is stored in the heat storage unit through the water circulation loop and the first refrigerant circulation loop for providing hot water, so that the heat pollution and energy waste caused by heat discharged into the air are solved; the water circulation loop and the second refrigerant circulation loop store the low-cost valley electricity in winter in the heat storage unit in the form of heat for defrosting of the outdoor heat exchanger, the temperature in the room is not fluctuated during defrosting, and the function of reducing the operation cost can be achieved.

Description

Heat pump system, control method and air conditioner
Technical Field
The invention belongs to the technical field of heat pumps, and particularly relates to a heat pump system, a control method and an air conditioner.
Background
The air source heat pump is an efficient, energy-saving and environment-friendly energy utilization mode and is more and more widely applied; however, in the conventional air source heat pump system, when refrigerating in summer, a large amount of waste heat generated by the outdoor heat exchanger is discharged into the air, so that not only is energy wasted, but also heat pollution is brought to the air; when the temperature is low in winter, the outdoor heat exchanger is easy to frost, defrosting is needed, generally, reverse circulation defrosting is carried out through the four-way valve, a heating cycle is converted into a refrigerating cycle, and the problems of long defrosting time and overlarge indoor temperature fluctuation exist.
Disclosure of Invention
In view of the above, the present invention provides a heat pump system, a control method and an air conditioner, which solve the problems of energy waste and difficulty in defrosting in the conventional method by combining a water circulation circuit, a heat storage unit, a first refrigerant circulation circuit and a second refrigerant circulation circuit.
In order to solve the above-mentioned problems, according to one aspect of the present application, an embodiment of the present invention provides a heat pump system including an outdoor heat exchanger having a first refrigerant line and a first water line, a heat storage unit having a second refrigerant line and a second water line, the first water line and the second water line being communicated to form a water circulation circuit; the air conditioner further comprises a compressor and an indoor heat exchanger, the compressor, the first refrigerant pipeline and the indoor heat exchanger form a first refrigerant circulation loop, and the compressor, the first refrigerant pipeline and the second refrigerant pipeline form a second refrigerant circulation loop.
In some embodiments, the heat storage unit further comprises a heat storage layer surrounding and heat-exchangeable with the second refrigerant line and the second water line.
In some embodiments, the heat storage layer is a phase change heat storage material.
In some embodiments, the phase change temperature range of the phase change heat storage material is: 40-60 ℃.
In some embodiments, the first water circuit comprises a plurality of water tubes, the first refrigerant circuit comprises a plurality of refrigerant tubes, and the number of water tubes is such that: s/10 is more than or equal to M and less than or equal to S/3; wherein M is the number of water tubes, S is the sum of the number of water tubes and the number of refrigerant tubes, and M and S are integers.
In some embodiments, the water circulation circuit further comprises a water circulation pump, one end of the water circulation pump is connected with the first water pipeline, and the other end of the water circulation pump is connected with the second water pipeline.
In some embodiments, the heat pump system further comprises a four-way valve, and the compressor is communicated with the first refrigerant pipeline through one path of the four-way valve, the first end of the other path is communicated with the indoor heat exchanger, and the second end of the other path is communicated with the second refrigerant pipeline.
In some embodiments, the first refrigerant circulation loop is further provided with a first throttle valve, and the compressor, the outdoor heat exchanger, the first throttle valve and the indoor heat exchanger are sequentially connected end to form the first refrigerant circulation loop.
In some embodiments, a second throttling valve is further disposed on the second refrigerant circulation loop, and the compressor, the heat storage unit, the second throttling valve and the outdoor heat exchanger are sequentially connected end to form the second refrigerant circulation loop.
In some embodiments, a first two-way valve is further provided on the first refrigerant circulation circuit, the first two-way valve being located between the four-way valve and the indoor heat exchanger.
In some embodiments, a second two-way valve is also provided on the second refrigerant circulation circuit, the second two-way valve being located between the four-way valve and the second refrigerant line.
According to another aspect of the present application, an embodiment of the present invention provides a control method of a heat pump system, the control method being used for controlling the heat pump system described above, including:
determining the current season, and controlling the working mode of the heat pump system according to the season, specifically:
in summer, the first refrigerant circulation loop and the water circulation loop work, and the first water pipeline absorbs the condensation heat of the first refrigerant pipeline and stores the condensation heat in the heat storage unit through the second water pipeline;
in winter, the second refrigerant circulation circuit is operated by valley electricity, and the heat storage unit stores condensation heat generated by the second refrigerant pipe.
In some embodiments, the control method further comprises:
in summer, the condensation heat stored in the heat storage unit is used to provide domestic hot water.
In some embodiments, the control method further comprises:
in winter, the heat of condensation stored in the heat storage unit is used for defrosting.
According to another aspect of the present application, an embodiment of the present invention also provides an air conditioner including the heat pump system described above.
Compared with the prior art, the heat pump system has at least the following beneficial effects:
firstly, the heat can be transferred and utilized in space and time, and the method specifically comprises the following steps: in summer, the first refrigerant circulation loop and the water circulation loop work, the first water pipeline absorbs condensation heat of the first refrigerant pipeline and stores the condensation heat in the heat storage unit through the second water pipeline, and heat storage is achieved and is used for providing domestic hot water for users; therefore, the problems of heat pollution and energy waste caused by heat discharged into air in summer are solved;
secondly, the invention also has an independent second refrigerant circulation loop, in winter, the loop works by using valley electricity to store heat, and the stored heat can be used for defrosting in peak electricity period; in other words, the water circulation loop and the second refrigerant circulation loop store the low-cost valley electricity in winter in the phase change heat storage material in the form of heat for defrosting of the outdoor heat exchanger, the defrosting does not cause fluctuation to the indoor temperature, and the effects of reducing the operation cost and optimizing the power resource allocation can be achieved.
On the other hand, the control method of the heat pump system provided by the present invention is designed based on the heat pump system, and the beneficial effects of the control method of the heat pump system are referred to the beneficial effects of the heat pump system, which are not described herein again.
On the other hand, the air conditioner provided by the present invention is designed based on the heat pump system, and the beneficial effects thereof refer to the beneficial effects of the heat pump system, which are not described herein again.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an outdoor heat exchanger in a heat pump system according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of a heat pump system according to an embodiment of the present invention.
Wherein:
1. an outdoor heat exchanger; 2. a heat storage unit; 3. a compressor; 4. an indoor heat exchanger; 5. a water circulating pump; 6. a four-way valve; 11. a first refrigerant line; 12. a first water line; 21. a second refrigerant line; 22. a second water line; 23. a heat storage layer; 71. a first throttle valve; 72. a second throttle valve; 81. a first two-way valve; 82. a second two-way valve.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or member to which the present invention is directed must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The present embodiment provides a heat pump system, as shown in fig. 1, the heat pump system includes an outdoor heat exchanger 1 having a first refrigerant line 11 and a first water line 12, a heat storage unit 2 having a second refrigerant line 21 and a second water line 22, the first water line 12 and the second water line 22 are communicated to form a water circulation loop; the air conditioner further comprises a compressor 3 and an indoor heat exchanger 4, wherein the compressor 3, the first refrigerant pipeline 11 and the indoor heat exchanger 4 form a first refrigerant circulating loop, and the compressor 3, the first refrigerant pipeline 11 and the second refrigerant pipeline 21 form a second refrigerant circulating loop.
Specifically, two pipeline systems are respectively arranged in the outdoor heat exchanger 1 and the heat storage unit 2 and respectively used for running refrigerant and water; because the outdoor heat exchanger 1 and the heat storage unit 2 are both provided with two pipeline systems, the heat pump system of the embodiment forms a water circulation loop and two refrigerant circulation loops; the water circulation loop is as follows: a first end of the first water pipeline 12 is connected with a first end of the second water pipeline 22, a second end of the second water pipeline 22 is connected with a second end of the first water pipeline 12 to form a loop, the loop is connected with an external water source for supplementing water, and the loop is also connected with water for a user for providing hot water for the user; the first refrigerant circulation circuit is: a first end of the compressor 3 is connected with a first end of a first refrigerant pipeline 11, a second end of the first refrigerant pipeline 11 is connected with a first end of the indoor heat exchanger 4, and a second end of the indoor heat exchanger 4 is connected with a second end of the compressor 3 to form a loop; the second refrigerant circulation circuit is: a first end of the compressor 3 is connected to a first end of the first refrigerant line 11, a second end of the first refrigerant line 11 is connected to a first end of the second refrigerant line 21, and a second end of the second refrigerant line 21 is connected to a second end of the compressor 3 to form a circuit.
In summer, the first refrigerant circulation circuit and the water circulation circuit both work, and the first water pipe 12 absorbs the condensation heat of the first refrigerant pipe 11 and stores the condensation heat in the heat storage unit 2 through the second water pipe 22, so that the storage of heat for providing domestic hot water for users is realized; in winter, the second refrigerant circulation loop works by utilizing valley electricity, heat generated in the working process is stored, and the stored heat can be used for defrosting in the peak electricity period; that is to say, the water circulation loop and the second refrigerant circulation loop store the low-cost valley electricity in winter in the heat storage unit 2 in the form of heat for defrosting of the outdoor heat exchanger 1, and the defrosting does not cause fluctuation to the indoor temperature, so that the effects of reducing the operation cost and optimizing the power resource allocation can be achieved.
In a specific embodiment:
the heat storage unit 2 further includes a heat storage layer 23, and the heat storage layer 23 wraps the second refrigerant pipe 21 and the second water pipe 22 and can exchange heat with the second refrigerant pipe 21 and the second water pipe 22; that is, the second refrigerant line 21 and the second water line 22 are arranged in parallel in the casing of the heat storage unit 2, the second refrigerant line 21 and the second water line 22 do not contact each other, and a gap between the both and the casing is filled with a heat storage material forming a heat storage layer that can exchange heat with the second refrigerant line 21 to store heat of the second refrigerant line 21, and the heat storage layer can exchange heat with the second water line 22 to store heat of the second water line 22 or extract heat of itself through the second water line 22.
In a specific embodiment: the heat storage layer 23 is a phase-change heat storage material, and the phase-change temperature range of the phase-change heat storage material is as follows: 40-60 ℃.
Phase change heat storage is an energy storage technology based on a phase change heat storage material or a composite phase change heat storage material, and has the advantages of constant temperature and high heat storage density, so that the phase change heat storage is widely researched, is particularly suitable for working conditions of discontinuous heat supply or uncoordinated supply and demand, is one of important ways for improving the energy utilization rate as an effective means for solving the contradiction between energy supply time and space, and can be used for solving the contradiction between heat energy supply and demand mismatch; the embodiment skillfully combines the phase change heat storage technology and the heat pump, and realizes the transfer utilization of heat in time and space.
In a specific embodiment: the first water line 12 includes a plurality of water tubes, the first refrigerant line 11 includes a plurality of refrigerant tubes, and the number of water tubes satisfies: s/10 is more than or equal to M and less than or equal to S/3; wherein M is the number of water tubes, S is the sum of the number of water tubes and the number of refrigerant tubes, and M and S are integers.
Specifically, as shown in fig. 2, the first refrigerant line 11 includes 8 refrigerant tubes, and the first water line 12 includes 4 water tubes (indicated by broken lines in fig. 2), the number of the water tubes satisfying M ═ S/3; thus, when the heat storage unit 2 does not participate in the operation, that is, the heat pump system provided by the embodiment performs the conventional refrigeration and heating, the refrigeration and heating effects are not affected basically because the number of the water pipes is small; when the heat storage unit 2 works, the number of the water pipes satisfies that S/10 is larger than or equal to M and smaller than or equal to S/3, so that the water system and the refrigerant system can work efficiently and normally.
In a specific embodiment: the water circulation loop also comprises a water circulation pump 5, one end of the water circulation pump 5 is connected with the first water pipeline 12, and the other end is connected with the second water pipeline 22; the circulating water pump 5 is for driving circulating water to circulate in the second water line 22 of the heat storage unit 2 and the first water line 12 of the outdoor heat exchanger 1.
In a specific embodiment: the heat pump system also comprises a four-way valve 6, one path of the compressor 3 is communicated with the first refrigerant pipeline 11 through the four-way valve 6, the first end of the other path is communicated with the indoor heat exchanger 4, and the second end is communicated with the second refrigerant pipeline 21; specifically, four ports of the four-way valve 6 are respectively: the positions of the slide valves of the four-way valve 6 are different, and the corresponding loops are different, that is, different working modes of the heat pump system are realized by the four-way valve 6 in the embodiment.
In a specific embodiment: the first refrigerant circulating loop is also provided with a first throttling valve 71, and the compressor 3, the outdoor heat exchanger 1, the first throttling valve 71 and the indoor heat exchanger 4 are sequentially connected end to form a first refrigerant circulating loop; the method specifically comprises the following steps: a first end of the compressor 3 is connected with a first end of the outdoor heat exchanger 1, a second end of the outdoor heat exchanger 1 is connected with a first end of a first throttle valve 71, a second end of the first throttle valve 71 is connected with a first end of the indoor heat exchanger 4, and a second end of the indoor heat exchanger 4 is connected with a second end of the compressor 3 to form a first refrigerant circulation loop.
In a specific embodiment: a second throttling valve 72 is further arranged on the second refrigerant circulating loop, and the compressor 3, the heat storage unit 2, the second throttling valve 72 and the indoor heat exchanger 4 are sequentially connected end to form a second refrigerant circulating loop; the method specifically comprises the following steps: a first end of the compressor 3 is connected to a first end of the heat storage unit 2, a second end of the heat storage unit 2 is connected to a first end of the second throttle valve 72, a second end of the second throttle valve 72 is connected to a first end of the indoor heat exchanger 4, and a second end of the outdoor heat exchanger 1 is connected to a second end of the compressor 3 to form a second refrigerant circulation loop.
The first throttle valve 71 and the second throttle valve 72 have at least the following three functions in the heat pump system provided in the present embodiment: firstly, changing high-temperature high-pressure liquid into low-temperature low-pressure liquid; is the boiling condition of the refrigerant in the evaporator; secondly, automatically adjusting the flow of the system refrigerant, and adjusting the evaporation temperature of the system refrigerant according to the change condition of the system load; and thirdly, the change range of the superheat degree of the outlet of the evaporator is controlled, and the heat exchange efficiency of the evaporator is fully exerted.
In a specific embodiment: the first refrigerant circulation circuit is further provided with a first two-way valve 81, and the first two-way valve 81 is located between the four-way valve 6 and the indoor heat exchanger 4. A second two-way valve 82 is also arranged on the second refrigerant circulating loop, and the second two-way valve 82 is positioned between the four-way valve 6 and the second refrigerant pipeline 21; the first two-way valve 81 and the second two-way valve 82 are opened or closed according to actual conditions, so that the first refrigerant circulation circuit and the second refrigerant circulation circuit are opened and closed, and further, the heat pump system provided by the embodiment selects a corresponding working mode according to user needs.
The heat pump system provided by the embodiment has multiple working modes, specifically:
the first mode is a refrigeration and waste heat recovery mode in summer, and a first refrigerant circulation loop and a water circulation loop work in the mode; the first refrigerant circulation circuit is: a slide valve of the four-way valve 6 moves leftwards, an E port and an S port are communicated, a D port and a C port are communicated, a first two-way valve 81 is opened, a second two-way valve 82 is closed, a second throttle valve 72 is closed, a first throttle valve 71 is opened, the opening degree is controlled according to logic, high-temperature and high-pressure refrigerant gas discharged from the compressor 3 enters a first refrigerant pipeline 11 of the outdoor heat exchanger 1 through the four-way valve 6, the refrigerant is cooled and condensed to be high-pressure and low-temperature liquid, the high-pressure and low-temperature liquid enters the indoor heat exchanger 4 after being throttled and reduced by the first throttle valve 71, the heat in indoor air is absorbed in the high-pressure and low-temperature liquid to be evaporated, and then the high-temperature and high-pressure refrigerant gas enters the compressor 3 through the four-way valve 6 to complete refrigerant circulation; the water circulation loop is as follows: circulating water circularly flows in the second water pipeline 22 of the heat storage unit 2 and the first water pipeline 12 of the outdoor heat exchanger 1 under the driving of the circulating water pump 5, absorbs the condensation waste heat in the first refrigerant pipeline 11 and stores the condensation waste heat in the phase-change heat storage material, and the heat storage process is completed until the temperature of the heat storage material reaches the target temperature; in the mode, the condensation heat generated in the refrigeration process is stored in the phase-change heat storage material, so that the refrigeration and heat storage are realized, the comprehensive utilization rate of energy is improved, and meanwhile, the heat pollution can be reduced.
In the second, winter single heat storage mode, the second refrigerant circulation loop is operated by valley current, the slide valve of the four-way valve 6 is moved to the right, the port E and the port D are conducted, the port S and the port C are conducted, the first two-way valve 81 is closed, the second two-way valve 82 is opened, the first throttle valve 71 is closed, the second throttle valve 72 is opened and the opening degree is controlled according to logic, the high-temperature and high-pressure refrigerant gas discharged from the compressor 3 enters the heat storage unit 2 through the four-way valve 6, the phase change heat storage material packaged therein is heated by using the condensation heat, the refrigerant after giving off heat is changed into high-pressure and low-temperature liquid, enters the outdoor heat exchanger 1 after throttling and pressure reduction through the second throttle valve 72, absorbs the heat in the outdoor air to be evaporated, and then enters the compressor 3 through the four-way valve 6, and the refrigerant cycle is completed; the mode is suitable for the condition that the heat storage unit 2 cannot provide waste heat in the heating process in winter, and the separate heat storage mode is operated by utilizing the valley electricity, so that the heat storage cost can be reduced, and the power resource allocation can be optimized.
And in the defrosting mode, the refrigerant system operates according to a conventional heating mode, and circulating water is driven by the circulating water pump 5 to extract heat from the phase-change heat storage material and supply the heat to the outdoor heat exchanger 1 for defrosting, so that the defrosting efficiency is improved, uninterrupted heat supply and defrosting can be realized, and the thermal comfort is improved.
Of course, the heat pump system provided in the present embodiment also has a normal cooling mode and a normal heating mode, in which the second two-way valve 82 is closed and the second throttle 72 is closed, and normal cooling and normal heating can be realized only through the first refrigerant circulation circuit.
When the heat pump system provided by the embodiment operates in a cooling mode in summer, part of condensation heat generated by the outdoor heat exchanger is transferred to the heat storage unit through circulating water and stored in the heat storage material, and after the heat storage unit is fully stored with heat, the outdoor heat exchanger continues to be cooled through air cooling, so that the purposes of recovering the condensation heat and improving the energy efficiency are achieved; in winter, the low-cost valley electricity in winter is stored in the phase change heat storage material in the form of heat through the water circulation loop and the second refrigerant circulation loop to be used for defrosting of the outdoor heat exchanger, the defrosting does not cause fluctuation to the indoor temperature, and the effects of reducing the operation cost and optimizing the power resource allocation can be achieved; the heat storage unit is charged by the heat pump mode, so that the advantages of valley electricity and the heat pump can be simultaneously utilized to store heat at low cost.
Example 2
The present embodiment provides a control method of a heat pump system, which is used for controlling the heat pump system of embodiment 1, and as shown in fig. 3, the control method includes:
in summer, the first refrigerant circulation circuit and the water circulation circuit are both operated, and the first water line 12 absorbs the condensation heat of the first refrigerant line 11 and stores the condensation heat in the heat storage unit 2 through the second water line 22; and the condensation heat stored in the heat storage unit 2 is used to provide domestic hot water;
in winter, the second refrigerant circulation circuit is operated by valley electricity, and the heat storage unit 2 stores condensation heat generated from the second refrigerant line 21; and the condensation heat stored in the heat storage unit 2 is used for defrosting.
Thus, the embodiment uses the condensation heat in summer to provide domestic hot water for users, thereby solving the problems of heat pollution and energy waste caused by heat discharged into the air in summer; in winter, the second refrigerant circulation loop works by utilizing valley electricity to store heat, the stored heat can be used for defrosting in a peak electricity period, namely the valley electricity which is low in price in winter is stored in the phase change heat storage material in a heat mode through the water circulation loop and the second refrigerant circulation loop for defrosting of the outdoor heat exchanger, the defrosting cannot cause fluctuation to the indoor temperature, and the effects of reducing the operation cost and optimizing the power resource allocation can be achieved.
Example 3
The present embodiment provides an air conditioner including the heat pump system of embodiment 1.
The present invention is not intended to be limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. A heat pump system, characterized in that it comprises an outdoor heat exchanger (1) having a first refrigerant line (11) and a first water line (12), a heat storage unit (2) having a second refrigerant line (21) and a second water line (22), said first (12) and second (22) water lines being in communication to form a water circulation circuit; the air conditioner further comprises a compressor (3) and an indoor heat exchanger (4), the compressor (3), the first refrigerant pipeline (11) and the indoor heat exchanger (4) form a first refrigerant circulating loop, and the compressor (3), the first refrigerant pipeline (11) and the second refrigerant pipeline (21) form a second refrigerant circulating loop.
2. The heat pump system according to claim 1, wherein the heat storage unit (2) further comprises a heat storage layer (23), the heat storage layer (23) wrapping the second refrigerant line (21) and the second water line (22) and being heat-exchangeable with the second refrigerant line (21) and the second water line (22).
3. The heat pump system according to claim 2, wherein the heat storage layer (23) is a phase change heat storage material.
4. The heat pump system of claim 3, wherein the phase change temperature range of the phase change heat storage material is: 40-60 ℃.
5. The heat pump system according to any one of claims 1-4, wherein said first water line (12) comprises a plurality of water tubes, said first refrigerant line (11) comprises a plurality of refrigerant tubes, and said number of water tubes is such that: s/10 is more than or equal to M and less than or equal to S/3; wherein M is the number of the water tubes, S is the sum of the number of the water tubes and the number of the refrigerant tubes, and M and S are integers.
6. Heat pump system according to any one of claims 1-4, characterized in that the water circulation circuit further comprises a circulating water pump (5), one end of the circulating water pump (5) being connected to the first water line (12) and the other end being connected to the second water line (22).
7. The heat pump system according to any one of claims 1 to 4, further comprising a four-way valve (6), wherein the compressor (3) is in communication with the first refrigerant line (11) through the four-way valve (6) in one path, and in communication with the indoor heat exchanger (4) at a first end and in communication with the second refrigerant line (21) at a second end.
8. The heat pump system according to any one of claims 1 to 4, wherein a first throttle valve (71) is further disposed on the first refrigerant circulation circuit, and the compressor (3), the outdoor heat exchanger (1), the first throttle valve (71) and the indoor heat exchanger (4) are sequentially connected end to form the first refrigerant circulation circuit.
9. The heat pump system according to any one of claims 1 to 4, wherein a second throttle valve (72) is further provided on the second refrigerant circulation circuit, and the compressor (3), the heat storage unit (2), the second throttle valve (72), and the outdoor heat exchanger (1) are connected end to end in this order to form the second refrigerant circulation circuit.
10. The heat pump system according to claim 7, wherein a first two-way valve (81) is further provided on the first refrigerant circulation circuit, the first two-way valve (81) being located between the four-way valve (6) and the indoor heat exchanger (4).
11. The heat pump system according to claim 7, wherein a second two-way valve (82) is further provided on said two refrigerant circulation circuit, said second two-way valve (82) being located between said four-way valve (6) and a second refrigerant line (21).
12. A control method of a heat pump system, characterized in that the control method is used for controlling the heat pump system according to any one of claims 1 to 11, and comprises:
in summer, the first refrigerant circulation circuit and the water circulation circuit are both operated, and the first water line (12) absorbs the condensation heat of the first refrigerant line (11) and stores the condensation heat in the heat storage unit (2) through the second water line (22);
in winter, the second refrigerant circulation circuit is operated by valley electricity, and the heat storage unit (2) stores condensation heat generated from the second refrigerant line (21).
13. The control method of the heat pump system according to claim 12, characterized by further comprising:
in summer, the heat of condensation stored in the heat storage unit (2) is used to provide domestic hot water.
14. The control method of the heat pump system according to claim 12 or 13, characterized in that the control method further comprises:
in winter, the heat of condensation stored in the heat storage unit (2) is used for defrosting.
15. An air conditioner characterized in that it comprises a heat pump system according to any one of claims 1 to 11.
CN202210126191.0A 2022-02-10 2022-02-10 Heat pump system, control method and air conditioner Active CN114484932B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207963223U (en) * 2018-01-25 2018-10-12 珠海格力电器股份有限公司 A kind of heat pump air conditioning system
CN109883082A (en) * 2019-03-21 2019-06-14 淄博博一新能源科技发展有限公司 A kind of no frosting air source energy-saving formula heat pump system and its application method
CN210425547U (en) * 2019-09-06 2020-04-28 珠海格力电器股份有限公司 Phase-change heat accumulating type heating system
CN111795517A (en) * 2020-06-17 2020-10-20 同济大学 Air source heat pump based on liquid excess cold and heat recovery defrosting technology

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207963223U (en) * 2018-01-25 2018-10-12 珠海格力电器股份有限公司 A kind of heat pump air conditioning system
CN109883082A (en) * 2019-03-21 2019-06-14 淄博博一新能源科技发展有限公司 A kind of no frosting air source energy-saving formula heat pump system and its application method
CN210425547U (en) * 2019-09-06 2020-04-28 珠海格力电器股份有限公司 Phase-change heat accumulating type heating system
CN111795517A (en) * 2020-06-17 2020-10-20 同济大学 Air source heat pump based on liquid excess cold and heat recovery defrosting technology

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