CN113720036A - Multifunctional double-source heat pump system and control method thereof - Google Patents

Multifunctional double-source heat pump system and control method thereof Download PDF

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Publication number
CN113720036A
CN113720036A CN202111004953.1A CN202111004953A CN113720036A CN 113720036 A CN113720036 A CN 113720036A CN 202111004953 A CN202111004953 A CN 202111004953A CN 113720036 A CN113720036 A CN 113720036A
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valve
way valve
heat exchanger
gas
liquid
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CN113720036B (en
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唐兰
黎清荐
黄韬
覃秋圆
陈海
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Guangzhou University
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Guangzhou University
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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
    • 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
    • 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
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

A multifunctional double-source heat pump system comprises a system component and a pipeline component; the system component comprises a compressor, an indoor heat exchanger, an outdoor air source heat exchanger, a ground water source heat exchanger, a gas-liquid separator, a liquid storage tank, a first electronic expansion valve and a second electronic expansion valve, wherein the ground water source heat exchanger comprises a water pump; the pipeline assembly comprises a four-way valve, a gas-liquid two-way switching valve and a one-way valve. The control method of the multifunctional double-source heat pump system is further provided, and the multifunctional double-source heat pump system is adopted. The invention combines the four-way valve, the gas-liquid two-way switching valve and the air source and ground water source operation, can switch the working modes of the system, realizes defrosting during refrigeration, heating and heating, can reasonably utilize the ground water source and the air source according to the environmental state and the user requirement, has stable operation, is energy-saving and environment-friendly, and belongs to the technical field of heat pumps.

Description

Multifunctional double-source heat pump system and control method thereof
Technical Field
The invention relates to the technical field of heat pumps, in particular to a multifunctional double-source heat pump system and a control method thereof.
Background
The heat pump can obtain low-grade energy from outside air, water, soil and solar energy, and can obtain heat which is several times larger than electric energy by conveying the electric energy to the compressor, so that the heat pump technology is a well-known energy-saving and environment-friendly technology. However, because the environment is an uncontrollable factor, the performance of the single heat source heat pump is affected by the change of weather and seasons, for example, the air source heat pump has low energy efficiency in a low-temperature environment, the pressure ratio is increased, the efficiency is deteriorated, the outdoor unit is easy to frost, and the normal use is affected; the ground source heat pump needs to pile or drill a well, the initial investment is high, and the underground ecological balance is easily influenced; the water source heat pump has strict requirements on regions and is not suitable for wide use; the heat pump utilizing solar energy can generate electricity while heating, but can be idle for a long time at night and in rainy days, and the utilization rate of equipment is low. A plurality of double-heat-source heat pumps are designed and invented by a plurality of people aiming at the advantages of high equipment utilization rate, no time limitation, wide system application range and capability of refrigerating and heating.
CN110686422A of Jingying, Inc., Jinghai electric appliance, discloses energy sources of solar radiation energy, sky long wave radiation energy and air energy, and combines PVT technology, radiation refrigeration technology and heat pump technology to realize the complementary advantages of various energy sources, adopts PVT system to generate electricity and heat in the daytime and adopts a radiation refrigeration device to refrigerate in the night, and can realize the functions of heating, refrigeration, hot water supply and power supply no matter whether the solar energy is sufficient or insufficient in the daytime or at night, thereby improving the utilization rate of equipment and reducing the energy consumption of the system.
The utility model patent CN210980430U of botuo (suzhou) new energy technology limited company in ninna discloses a method for connecting a ground source heat pump unit and an air source heat pump unit in parallel, which can use a ground source heat pump or an air source heat pump alone or simultaneously according to the hot water temperature required by the user side, thereby avoiding the problems of performance reduction of the air source heat pump in low temperature environment and unbalanced heat extraction of the ground source heat pump in winter and summer.
CN110285572A, Zhao Xiao Song et al, of the university of southeast, applies "an air-supplying enthalpy-increasing double-source heat pump water heater system" which uses solar energy and air energy as heat sources, and the solar energy can also provide part of electric energy, and the air can supercool the refrigerant outlet of a condenser, so as to realize indoor water heating; the system also combines the gas-supplementing and enthalpy-increasing technology, so that the stability of the compressor is improved; the multi-stage throttling and gas-liquid separation improve the liquid phase component in the refrigerant, thereby improving the heat exchange performance of the heat exchanger. However, when insufficient solar energy is not considered in winter, the heat exchanger for absorbing heat at the solar end has poor heat exchange performance, and the stability of the compressor is influenced.
The utility model discloses a Shanxi Yang xu new forms of energy science and technology Limited company's wang wenhu's utility model CN210070104U "a double-source heat pump heat recovery hot water air conditioning system" utilizes bathing waste water and air as the heat source, retrieves the heat of bathing waste water and summer air conditioner condensation heat, retrieves condensation heat system hot water in summer, excessive season and the general priority recovery bathing waste water waste heat in winter, when the sewage source energy is not enough, air energy heat pump and the operation of sewage source heat pump coupling also can provide hot water.
The invention patent CN110470075B of Zhang Chunlu et al of Tongji university uses a solar heat storage type water-ground dual heat source heat pump system for temperature control of aquaculture soil pond, and uses idle pond and underground water as heat sources. In winter, water source heating is mainly used, the problem of freezing of an ultralow-temperature water source is avoided, and ground source heating is used as an auxiliary heating; in summer, heat is only extracted from underground water, and the underground heat balance is maintained all the year round. Therefore, the water source is combined with the ground source, the surrounding environment is skillfully applied, the initial investment is reduced, and the heating continuity and the system stability are ensured.
The six technologies adopt double heat sources or even multiple heat sources to improve the utilization rate and the application range of the heat pump, and utilize surrounding environment resources to realize energy conservation and environmental protection, but part of the technologies have the problems that only single heating can be carried out, refrigeration cannot be carried out, or defrosting cannot be carried out on an outdoor unit in winter, and refrigerant is retained in a non-working state due to uncontrollable refrigerant distribution of a system, so that the circulation quantity of the refrigerant is reduced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the multifunctional double-source heat pump system capable of reasonably utilizing the ground source and the air source according to the needs and the control method thereof are provided.
In order to achieve the purpose, the invention adopts the following technical scheme: a multifunctional double-source heat pump system comprises a system component and a pipeline component; the system component comprises a compressor, an indoor heat exchanger, an outdoor air source heat exchanger, a ground water source heat exchanger, a gas-liquid separator, a liquid storage tank, a first electronic expansion valve and a second electronic expansion valve, wherein the ground water source heat exchanger comprises a water pump; the pipeline assembly comprises a four-way valve, a gas-liquid two-way switching valve, a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve, a sixth one-way valve and a seventh one-way valve, and the four-way valve and the gas-liquid two-way switching valve respectively comprise a D end, an S end, an E end and a C end; the air suction port of the compressor is connected with the outlet end of the gas-liquid separator, the air exhaust port of the compressor is connected with the D end of the four-way valve, the C end of the four-way valve is connected with the first end of the ground water source heat exchanger, the S end of the four-way valve is connected with the inlet end of the gas-liquid separator, and the E end of the four-way valve is connected with the first end of the indoor heat exchanger; the second end of the ground water source heat exchanger is connected with the inlet end of a second one-way valve, the outlet end of the second one-way valve is connected with the D end of the gas-liquid two-way switching valve, the S end of the gas-liquid two-way switching valve is connected with the inlet end of the gas-liquid separator, the C end of the gas-liquid two-way switching valve is connected with the first end of the outdoor air source heat exchanger, the second end of the outdoor air source heat exchanger is connected with the inlet end of a sixth one-way valve, and the outlet end of the sixth one-way valve is connected with the inside of the liquid storage tank; the second end of the outdoor air source heat exchanger is also connected with the outlet end of a seventh one-way valve, and the inlet end of the seventh one-way valve is connected with the inside of the liquid storage tank through a second electronic expansion valve; the E end of the gas-liquid two-way switching valve is connected with the inlet end of a fifth one-way valve, and the outlet end of the fifth one-way valve is connected with the inside of the liquid storage tank; the second end of the indoor heat exchanger is connected with the outlet end of a fourth one-way valve, the inlet end of the fourth one-way valve is connected with the inside of the liquid storage tank through a first electronic expansion valve, the second end of the indoor heat exchanger is also connected with the inlet end of the first one-way valve, and the outlet end of the first one-way valve is connected with the D end of the gas-liquid two-way switching valve; the second end of the ground water source heat exchanger is also connected with the outlet end of a third one-way valve, and the inlet end of the third one-way valve is connected with the inside of the liquid storage tank through a first electronic expansion valve.
After the structure is adopted, the system can have a plurality of working modes by controlling the working state of the pipeline assembly. The system has simple structure, can refrigerate and heat, can not cause indoor temperature fluctuation when the outdoor unit defrosts in winter, can adjust the flow distribution of the refrigerant of the system, can recycle the refrigerant to the gas-liquid separator so as to reduce the retention of the refrigerant, can realize the switching of the refrigeration and heating modes through the four-way valve and the gas-liquid two-way switching valve, selectively operates the water source or air source heat exchanger or the two-source heat exchanger by controlling the opening and closing and the opening of the double electronic expansion valve, and controls the distribution and the backflow of the refrigerant.
Preferably, the four-way valve and the gas-liquid two-way switching valve are both in a power-on state and a power-off state; when the four-way valve is in a power-on state, the D end is communicated with the E end, the S end is communicated with the C end, and when the four-way valve is in a power-off state, the D end is communicated with the C end, and the S end is communicated with the E end; when the gas-liquid bidirectional switching valve is in a power-on state, the D end is communicated with the E end, the S end is communicated with the C end, and when the gas-liquid bidirectional switching valve is in a power-off state, the D end is communicated with the C end, and the S end is communicated with the E end. After the structure is adopted, the on-off of the circuit of the four-way valve and the gas-liquid two-way switching valve can be controlled, so that the pipeline communication state in the valve is controlled, and the system is suitable for different working modes of the system.
Preferably, the multifunctional dual-source heat pump system has multiple working modes, wherein the multiple working modes comprise a ground source refrigeration mode, an air source refrigeration mode and a dual-source series refrigeration mode; in a ground source refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in a power-on state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed; in an air source refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is closed, the gas-liquid two-way switching valve is in a power-down state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed; in a double-source series refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is started, the gas-liquid two-way switching valve is in a power-down state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed.
After the structure is adopted, when the system adopts a ground source refrigeration mode, the refrigerant discharged by the compressor sequentially flows through the four-way valve, the ground water source heat exchanger, the second one-way valve, the gas-liquid two-way switching valve, the fifth one-way valve, the liquid storage tank, the first electronic expansion valve, the fourth one-way valve and the indoor heat exchanger, then flows into the gas-liquid separator through the four-way valve, and the separated gaseous refrigerant is sucked and compressed by the compressor; when the system adopts an air source refrigeration mode, the refrigerant discharged by the compressor sequentially flows through the four-way valve, the ground water source heat exchanger, the second one-way valve, the gas-liquid two-way switching valve, the outdoor air source heat exchanger, the sixth one-way valve, the liquid storage tank, the first electronic expansion valve, the fourth one-way valve and the indoor heat exchanger, and then flows into the gas-liquid separator through the four-way valve, the separated gaseous refrigerant is sucked and compressed by the compressor, the water pump does not work in the mode, and the ground water source heat exchanger is only used as a channel; when the system adopts a double-source series refrigeration mode, the circulation path of the refrigerant is the same as that of the air source refrigeration mode, but the ground water source heat exchanger dissipates the heat of the refrigerant flowing through at the moment because the water pump is started.
Preferably, the multifunctional dual-source heat pump system has multiple working modes, wherein the multiple working modes comprise a ground source defrosting mode, a ground source heating mode, an air source heating mode and a dual-source combined heating mode; in the ground source defrosting mode, the four-way valve is in a power-on state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in a power-off state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed; in a ground source heating mode, the four-way valve is in a power-on state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in a power-on state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed; in the air source heating mode, the four-way valve is in an electrified state, a water pump of the ground water source heat exchanger is closed, the gas-liquid two-way switching valve is in an electrified state, the first electronic expansion valve is closed, and the second electronic expansion valve is opened; under the double-source combined heating mode, the four-way valve is in an electrified state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in an electrified state, the first electronic expansion valve is opened, and the second electronic expansion valve is opened.
After the structure is adopted, when the system adopts a ground source defrosting mode, the refrigerant discharged by the compressor sequentially flows through the four-way valve, the indoor heat exchanger, the first one-way valve, the gas-liquid two-way switching valve, the outdoor air source heat exchanger, the sixth one-way valve, the liquid storage tank, the first electronic expansion valve, the third one-way valve and the ground water source heat exchanger, then flows into the gas-liquid separator through the four-way valve, the separated gaseous refrigerant is sucked and compressed by the compressor, and in the process, the frosting on the surface of the outdoor air source heat exchanger is heated by utilizing the supercooling heat of the refrigerant to melt the frosting; when the system adopts a ground source heating mode, the refrigerant discharged by the compressor sequentially flows through the four-way valve, the indoor heat exchanger, the first one-way valve, the gas-liquid two-way switching valve, the fifth one-way valve, the liquid storage tank, the first electronic expansion valve, the third one-way valve and the ground water source heat exchanger, then flows into the gas-liquid separator through the four-way valve, and the separated gaseous refrigerant is sucked and compressed by the compressor; when the system adopts an air source heating mode, the refrigerant discharged by the compressor sequentially flows through the four-way valve, the indoor heat exchanger, the first one-way valve, the gas-liquid two-way switching valve, the fifth one-way valve, the liquid storage tank, the second electronic expansion valve, the seventh one-way valve and the outdoor air source heat exchanger, then flows into the gas-liquid separator through the gas-liquid two-way switching valve, and the separated gaseous refrigerant is sucked and compressed by the compressor; when the system adopts a ground source heating mode, the refrigerant discharged by the compressor sequentially flows through the four-way valve, the indoor heat exchanger, the first one-way valve, the gas-liquid two-way switching valve, the fifth one-way valve, the liquid storage tank, the first electronic expansion valve, the third one-way valve and the ground water source heat exchanger, then flows into the gas-liquid separator through the four-way valve, and the separated gaseous refrigerant is sucked and compressed by the compressor; when the system adopts a double-source combined heating mode, the refrigerant discharged by the compressor sequentially flows through the indoor heat exchanger, the first one-way valve, the gas-liquid two-way switching valve, the fifth one-way valve and the liquid storage tank, the refrigerant flowing out of the liquid storage tank is divided into two paths, one path of the refrigerant passes through the first electronic expansion valve, the third one-way valve and the ground water source heat exchanger and then flows into the gas-liquid separator through the four-way valve, the other path of the refrigerant passes through the second electronic expansion valve, the seventh one-way valve and the outdoor air source heat exchanger and then flows into the gas-liquid separator through the gas-liquid two-way switching valve, and the separated gaseous refrigerant is sucked and compressed by the compressor.
Preferably, the indoor heat exchanger is a water-cooling heat exchanger, and the outdoor air source heat exchanger is an air-cooling heat exchanger.
Preferably, the outdoor air source heat exchanger includes a liquid separator and a fan.
A control method of a multifunctional double-source heat pump system is characterized in that the working mode is freely selected by a user, and the working states of a four-way valve, a gas-liquid two-way switching valve, a water pump, a first electronic expansion valve and a second electronic expansion valve are controlled according to the working mode selected by the user. After the method is adopted, a user can select a working mode according to the outdoor environment condition and the self requirement.
Preferably, when the multifunctional heat pump system is in a ground source refrigeration mode or a dual-source series refrigeration mode, the underground water exchanges heat through the ground water source heat exchanger, and the waste heat of the underground water after heat exchange is recovered. After the method is adopted, the recovered underground water is heated, and the recovered waste heat can be reused, thereby saving energy.
The working process of the multifunctional double-source heat pump system is as follows:
in the ground source refrigeration mode, the four-way valve is powered off, the gas-liquid two-way switching valve is powered on, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the ground water source heat exchanger through the D end and the C end of the four-way valve, a water pump of the ground water source heat exchanger is started, the refrigerant releases heat to a ground water source and then flows out from the second end of the ground water source heat exchanger, then the refrigerant sequentially flows through the second one-way valve and the gas-liquid two-way switching valve, the D end and the E end of the gas-liquid two-way switching valve are communicated in the power-on state, the refrigerant flows into the liquid storage tank through the fifth one-way valve, the refrigerant is throttled and depressurized through the first electronic expansion valve to generate low-temperature low-pressure refrigerant, the low-temperature refrigerant flows into the indoor heat exchanger through the fourth one-way valve, the low-temperature refrigerant can be used for cooling indoor water, so as to prepare cold water, and the refrigerant flows out from the first end of the indoor heat exchanger after absorbing heat exchanger, the refrigerant is conveyed to the inlet end of the gas-liquid separator through the end E and the end D of the four-way valve, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to obtain a gaseous refrigerant, the gaseous refrigerant is further conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and performs circulating refrigeration according to the gaseous refrigerant.
In the air source refrigeration mode, the four-way valve is powered off, the gas-liquid two-way switching valve is powered off, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the ground water source heat exchanger through the D end and the C end of the four-way valve, the water pump of the ground water source heat exchanger is not started at the moment, the gaseous high-temperature high-pressure refrigerant is only used as a channel without heat exchange, the gaseous high-temperature high-pressure refrigerant sequentially flows through the second one-way valve and the gas-liquid two-way switching valve, the D end and the C end of the gas-liquid two-way switching valve are communicated, the high-temperature high-pressure refrigerant is conveyed to the outdoor air source heat exchanger, the high-temperature high-pressure refrigerant is subjected to heat exchange through the outdoor fan, the heat-released refrigerant is conveyed to the liquid storage tank through the sixth one-way valve, the low-temperature low-pressure refrigerant is generated through throttling and pressure reduction of the first electronic expansion valve, the refrigerant flows into the indoor heat exchanger through the fourth one-way valve, the low-temperature-low-pressure refrigerant can be used for cooling indoor water, and cold water is prepared, the refrigerant absorbs heat and flows out from the first end of the indoor heat exchanger, the cold water is conveyed to the inlet end of the gas-liquid separator through the E end and the D end of the four-way valve, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to obtain gaseous refrigerant, the gaseous refrigerant is conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and performs circulating refrigeration according to the gaseous refrigerant.
In a double-source series refrigeration mode, the four-way valve is powered off, the gas-liquid two-way switching valve is powered off, the compressor compresses the refrigerant into gaseous high-temperature and high-pressure refrigerant to be discharged, the gaseous high-temperature and high-pressure refrigerant is conveyed to the ground water source heat exchanger through the D end and the C end of the four-way valve, a water pump of the ground water source heat exchanger is started, the refrigerant with heat released to a ground water source flows out from the second end of the ground water source heat exchanger and sequentially flows through the second one-way valve and the gas-liquid two-way switching valve, the D end and the C end of the gas-liquid two-way switching valve are communicated, the refrigerant passes through the outdoor air source heat exchanger and is cooled and subcooled by an outdoor fan, the generated low-temperature and high-pressure refrigerant flows out from the second end of the outdoor air source heat exchanger and is conveyed to the liquid storage tank through the sixth one-way valve, then is throttled by the first electronic expansion valve to generate low-temperature and low-pressure refrigerant, and flows into the indoor heat exchanger through the fourth one-way valve, and utilizing a low-temperature low-pressure refrigerant to cool indoor water to prepare cold water, enabling the refrigerant to flow out from the first end of the indoor heat exchanger after absorbing heat, conveying the cold water to the inlet end of the gas-liquid separator through the E end and the S end of the four-way valve, carrying out gas-liquid separation on the refrigerant through the gas-liquid separator to obtain a gaseous refrigerant, further conveying the gaseous refrigerant to the suction inlet of the compressor from the outlet end of the gas-liquid separator, compressing the sucked gaseous refrigerant by the compressor, and carrying out circulating refrigeration according to the gaseous refrigerant.
In the ground source defrosting mode, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the indoor heat exchanger through the D end and the E end of the four-way valve, the high-temperature high-pressure refrigerant is utilized, indoor water can be heated by the indoor heat exchanger, the refrigerant after heat release flows out of the second end of the indoor heat exchanger, and sequentially flows through the first one-way valve and the gas-liquid two-way switching valve, at the moment, the gas-liquid two-way switching valve is powered off, the D end and the C end of the gas-liquid two-way switching valve are communicated, the refrigerant flows into the outdoor air source heat exchanger to carry out heat exchange, frosting on the surface of the outdoor air source heat exchanger is melted by utilizing supercooling heat of the refrigerant, low-temperature high-pressure refrigerant flows out of the second end of the outdoor air source heat exchanger, and then the low-temperature high-pressure refrigerant is conveyed to the liquid storage tank through the sixth one-way valve. The low-temperature high-pressure refrigerant in the liquid storage tank is throttled and depressurized through the first electronic expansion valve to generate a low-temperature low-pressure refrigerant, the low-temperature low-pressure refrigerant is further conveyed to the ground water source heat exchanger through the third one-way valve, the low-temperature low-pressure refrigerant flows out of the first end of the ground water source heat exchanger after absorbing the heat of the ground water source, the low-temperature low-pressure refrigerant passes through the C end and the S end of the four-way valve and is conveyed to the inlet end of the gas-liquid separator, the gas-liquid separator is used for carrying out gas-liquid separation on the refrigerant to generate a gaseous refrigerant, the gaseous refrigerant is further conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and circulates according to the cycle.
In the air source heating mode, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the indoor heat exchanger through the D end and the E end of the four-way valve, the indoor water can be heated by the high-temperature high-pressure refrigerant, the refrigerant after heat release flows out of the second end of the indoor heat exchanger, the refrigerant sequentially flows through the first one-way valve and the gas-liquid two-way switching valve, the gas-liquid two-way valve is electrified, the D end and the E end of the gas-liquid two-way switching valve are communicated, the refrigerant flows into the liquid storage tank through the fifth one-way valve, the second electronic expansion valve is opened, the first electronic expansion valve is closed, the refrigerant flows out of the liquid storage tank, is throttled and depressurized through the second electronic expansion valve to form low-temperature low-pressure refrigerant, the low-temperature low-pressure refrigerant is conveyed to the outdoor air source heat exchanger through the seventh one-way valve, and the low-temperature low-pressure refrigerant flows out of the first end of the outdoor air source heat exchanger through the outdoor fan, the refrigerant is conveyed to the inlet end of the gas-liquid separator through the C end and the S end of the gas-liquid two-way valve, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to generate gaseous refrigerant, the gaseous refrigerant is further conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and circulates according to the gaseous refrigerant.
In a ground source heating mode, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the indoor heat exchanger through the D end and the E end of the four-way valve, the indoor water can be heated by the high-temperature high-pressure refrigerant, the refrigerant after heat release flows out of the second end of the indoor heat exchanger and sequentially flows through the first one-way valve and the gas-liquid two-way switching valve, the gas-liquid two-way valve is powered on, the D end and the E end of the gas-liquid two-way switching valve are communicated, the refrigerant flows into the liquid storage tank through the fifth one-way valve, the first electronic expansion valve is opened, the second electronic expansion valve is closed, the refrigerant flows out of the liquid storage tank, forms low-temperature low-pressure refrigerant after throttling and pressure reduction through the first electronic expansion valve, and then is conveyed to the ground water source heat exchanger through the third one-way valve, the heat of the ground water source is absorbed and then flows out of the first end of the ground water source heat exchanger, the refrigerant is conveyed to the inlet end of the gas-liquid separator through the C end and the S end of the four-way valve, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to generate gaseous refrigerant, the gaseous refrigerant is further conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and circulates according to the gaseous refrigerant.
In the double-source combined heating mode, a compressor compresses a refrigerant into a gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to an indoor heat exchanger through a D end and an E end of a four-way valve, the high-temperature high-pressure refrigerant can be used for heating indoor water, the refrigerant after heat release flows out of the second end of the indoor heat exchanger and sequentially flows through a first one-way valve and a gas-liquid two-way switching valve, the gas-liquid two-way valve is powered on, the D end and the E end of the gas-liquid two-way switching valve are communicated, the refrigerant flows into a liquid storage tank through a fifth one-way valve, the first electronic expansion valve and a second electronic expansion valve are both opened, the refrigerant flows out of the liquid storage tank and is throttled and depressurized through a first electronic expansion valve and a second electronic expansion valve to form a first low-temperature low-pressure refrigerant and a second low-temperature low-pressure refrigerant, and the first low-temperature low-pressure refrigerant is conveyed to the ground water source heat exchanger through a third one-way valve, the heat of the ground water source is absorbed and flows out from the first end of the ground water source heat exchanger, the heat of the ground water source heat exchanger passes through the C end and the S end of the four-way valve and is conveyed to the inlet end of the gas-liquid separator, the second low-temperature low-pressure refrigerant is conveyed to the outdoor air source heat exchanger through the seventh one-way valve, the low-temperature low-pressure refrigerant is subjected to heat exchange through the outdoor fan and flows out from the first end of the outdoor air source heat exchanger, the low-temperature low-pressure refrigerant passes through the C end and the S end of the gas-liquid two-way valve and is conveyed to the inlet end of the gas-liquid separator, the first low-temperature low-pressure refrigerant and the second low-temperature low-pressure refrigerant are converged in the gas-liquid separator, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to generate gaseous refrigerant, the gaseous refrigerant is conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, the compressor is used for compressing the sucked gaseous refrigerant, and heating is circulated.
In summary, the present invention has the following advantages:
(1) the geothermal source and the air source are used as cold and heat sources of the heat pump system, the four-way valve is used for switching the heating mode and the refrigerating mode, and a user can select only the geothermal source as the cold and heat source or only the air source as the cold and heat source or perform combined operation of the two sources according to the outdoor environment and the self requirement, so that the application range of the heat pump is expanded.
(2) By adopting the double-source combined operation, the defrosting of the outdoor air source heat exchanger can be realized in winter, heat can be continuously generated during heating, and the fluctuation of indoor temperature cannot be caused.
(3) The adoption of the double electronic expansion valves is beneficial to controlling the distribution of the system refrigerant, and the refrigerant can be recycled to the gas-liquid separator by adjusting the opening of the electronic expansion valves, so that the refrigerant retention is reduced, and the problem caused by the reduction of the refrigerant circulation volume is avoided.
(4) A double-source series connection mode can be adopted during refrigeration, and the problem of refrigerant distribution in a parallel connection mode is avoided.
Drawings
Fig. 1 is a schematic structural diagram of a multifunctional dual-source heat pump system.
The system comprises a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a liquid storage tank 4, a gas-liquid two-way switching valve 5, a ground water source heat exchanger 6, a first electronic expansion valve 701, a second electronic expansion valve 702, an outdoor air source heat exchanger 8, a fan 9, a gas-liquid separator 10, a first one-way valve 1101, a second one-way valve 1102, a second one-way valve 1103, a fourth one-way valve 1104, a fifth one-way valve 1105, a sixth one-way valve 1106 and a seventh one-way valve 1107.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example one
Referring to fig. 1, a multifunctional dual-source heat pump system includes a system component and a piping component; the system component comprises a compressor 1, an indoor heat exchanger 3, an outdoor air source heat exchanger 8, a ground water source heat exchanger 6, a gas-liquid separator 10, a liquid storage tank 4, a first electronic expansion valve 701 and a second electronic expansion valve 702, wherein the ground water source heat exchanger comprises a water pump, the ground water source heat exchanger, the indoor heat exchanger and the outdoor air source heat exchanger all comprise a first end and a second end, and refrigerant exchanges heat between the first end and the second end; the pipeline assembly comprises a four-way valve 2, a gas-liquid two-way switching valve 5, a first one-way valve 1101, a second one-way valve 1102, a third one-way valve 1103, a fourth one-way valve 1104, a fifth one-way valve 1105, a sixth one-way valve 1106 and a seventh one-way valve 1107, and the four-way valve and the gas-liquid two-way switching valve respectively comprise a D end, an S end, an E end and a C end.
The air suction port of the compressor is connected with the outlet end of the gas-liquid separator, the air exhaust port of the compressor is connected with the D end of the four-way valve, the C end of the four-way valve is connected with the first end of the ground water source heat exchanger, the S end of the four-way valve is connected with the inlet end of the gas-liquid separator, and the E end of the four-way valve is connected with the first end of the indoor heat exchanger; the second end of the ground water source heat exchanger is connected with the inlet end of a second one-way valve, the outlet end of the second one-way valve is connected with the D end of the gas-liquid two-way switching valve, the S end of the gas-liquid two-way switching valve is connected with the inlet end of the gas-liquid separator, the C end of the gas-liquid two-way switching valve is connected with the first end of the outdoor air source heat exchanger, the second end of the outdoor air source heat exchanger is connected with the inlet end of a sixth one-way valve, and the outlet end of the sixth one-way valve is connected with the inside of the liquid storage tank; the second end of the outdoor air source heat exchanger is also connected with the outlet end of a seventh one-way valve, and the inlet end of the seventh one-way valve is connected with the inside of the liquid storage tank through a second electronic expansion valve; the E end of the gas-liquid two-way switching valve is connected with the inlet end of a fifth one-way valve, and the outlet end of the fifth one-way valve is connected with the inside of the liquid storage tank; the second end of the indoor heat exchanger is connected with the outlet end of a fourth one-way valve, the inlet end of the fourth one-way valve is connected with the inside of the liquid storage tank through a first electronic expansion valve, the second end of the indoor heat exchanger is also connected with the inlet end of the first one-way valve, and the outlet end of the first one-way valve is connected with the D end of the gas-liquid two-way switching valve; the second end of the ground water source heat exchanger is also connected with the outlet end of a third one-way valve, and the inlet end of the third one-way valve is connected with the inside of the liquid storage tank through a first electronic expansion valve.
The four-way valve and the gas-liquid two-way switching valve are both in a power-on state and a power-off state; when the four-way valve is in a power-on state, the D end is communicated with the E end, the S end is communicated with the C end, and when the four-way valve is in a power-off state, the D end is communicated with the C end, and the S end is communicated with the E end; when the gas-liquid bidirectional switching valve is in a power-on state, the D end is communicated with the E end, the S end is communicated with the C end, and when the gas-liquid bidirectional switching valve is in a power-off state, the D end is communicated with the C end, and the S end is communicated with the E end.
The multifunctional dual-source heat pump system has multiple working modes, wherein the multiple working modes comprise a ground source refrigeration mode, an air source refrigeration mode and a dual-source series refrigeration mode.
In the ground source refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in a power-on state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed.
In the air source refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is closed, the gas-liquid two-way switching valve is in a power-down state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed.
In a double-source series refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is started, the gas-liquid two-way switching valve is in a power-down state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed.
The multifunctional dual-source heat pump system has multiple working modes, wherein the multiple working modes comprise a ground source defrosting mode, a ground source heating mode, an air source heating mode and a dual-source combined heating mode.
In the ground source defrosting mode, the four-way valve is in a power-on state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in a power-off state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed.
In the ground source heating mode, the four-way valve is in an electrified state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in an electrified state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed.
In the air source heating mode, the four-way valve is in an electrified state, a water pump of the ground water source heat exchanger is closed, the gas-liquid two-way switching valve is in an electrified state, the first electronic expansion valve is closed, and the second electronic expansion valve is opened.
Under the double-source combined heating mode, the four-way valve is in an electrified state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in an electrified state, the first electronic expansion valve is opened, and the second electronic expansion valve is opened.
The indoor heat exchanger is a water-cooling heat exchanger, and the outdoor air source heat exchanger is an air-cooling heat exchanger.
The outdoor air source heat exchanger comprises a liquid separator and a fan 9.
The first check valve, the second check valve, the third check valve, the fourth check valve, the fifth check valve, the sixth check valve and the seventh check valve are commercially available check valves, and the flow direction of the fluid is one-way flow from the inlet end to the outlet end through the valve.
The four-way valve is a commercial product.
The four-way valve and the gas-liquid two-way switching valve respectively comprise a main valve and a control valve, the main valve is a pneumatic reversing valve, the control valve is an electromagnetic reversing valve, a valve body of the main valve is provided with a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe, and the D end, the E end, the S end and the C end are respectively pipe orifices of the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe. A valve body of the control valve is provided with a first capillary tube, a second capillary tube, a third capillary tube and a fourth capillary tube, the first capillary tube and the third capillary tube are respectively communicated with an exhaust pipe and an air suction pipe of a compressor, a main valve core is arranged in the main valve body, the second capillary tube and the third capillary tube are respectively connected with spaces at two ends of the main valve core, and the main valve core is pushed to move through the internal fluid pressure difference of the second capillary tube and the third capillary tube.
A first capillary tube of the four-way valve is connected to a first connecting pipe of the four-way valve, a third capillary tube of the four-way valve is connected to a third connecting pipe of the four-way valve, a first capillary tube of the gas-liquid two-way switching valve is connected to an exhaust pipe of the compressor, and a third capillary tube of the gas-liquid two-way switching valve is connected to a gas suction pipe of the compressor.
A control method of the multifunctional double-source heat pump system adopts the multifunctional double-source heat pump system, the working mode of the multifunctional double-source heat pump system is freely selected by a user, and the working states of the four-way valve, the gas-liquid two-way switching valve, the water pump, the first electronic expansion valve and the second electronic expansion valve are controlled according to the working mode selected by the user.
When the multifunctional heat pump system is in a ground source refrigeration mode or a double-source series refrigeration mode, the heat of the underground water is exchanged through the ground water source heat exchanger, and the waste heat of the exchanged underground water is recovered.
When the multifunctional double-source heat pump system is used, the working process is as follows:
when a ground source refrigeration mode is adopted, the four-way valve is powered off, the gas-liquid two-way switching valve is powered on, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the ground water source heat exchanger through the D end and the C end of the four-way valve, the water pump of the ground water source heat exchanger is started, the refrigerant releases heat to a ground water source and then flows out from the second end of the ground water source heat exchanger, then the refrigerant sequentially flows through the second one-way valve and the gas-liquid two-way switching valve, the D end and the E end of the gas-liquid two-way switching valve are communicated in a power-on state, the refrigerant flows into the liquid storage tank through the fifth one-way valve and is throttled and depressurized through the first electronic expansion valve to generate low-temperature low-pressure refrigerant, the low-temperature low-pressure refrigerant flows into the indoor heat exchanger through the fourth one-way valve, the low-temperature low-pressure refrigerant can be used for cooling indoor water, so as to prepare cold water, and the refrigerant flows out from the first end of the indoor heat exchanger after absorbing heat, the refrigerant is conveyed to the inlet end of the gas-liquid separator through the end E and the end D of the four-way valve, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to obtain a gaseous refrigerant, the gaseous refrigerant is further conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and performs circulating refrigeration according to the gaseous refrigerant.
When an air source refrigeration mode is adopted, the four-way valve is powered off, the gas-liquid two-way switching valve is powered off, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the ground water source heat exchanger through the D end and the C end of the four-way valve, the water pump of the ground water source heat exchanger is not started at the moment, the gaseous high-temperature high-pressure refrigerant is only used as a channel without heat exchange, the gaseous high-temperature high-pressure refrigerant sequentially flows through the second one-way valve and the gas-liquid two-way switching valve, the D end and the C end of the gas-liquid two-way switching valve are communicated, the high-temperature high-pressure refrigerant is conveyed to the outdoor air source heat exchanger, the high-temperature high-pressure refrigerant is subjected to heat exchange through the outdoor fan, the heat-released refrigerant is conveyed to the liquid storage tank through the sixth one-way valve, the low-temperature low-pressure refrigerant is generated through throttling and pressure reduction through the first electronic expansion valve, the indoor heat exchanger is flowed into the low-temperature refrigerant for indoor water cooling by utilizing the low-temperature low-temperature refrigerant, and cold water is prepared, the refrigerant absorbs heat and flows out from the first end of the indoor heat exchanger, the cold water is conveyed to the inlet end of the gas-liquid separator through the E end and the D end of the four-way valve, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to obtain gaseous refrigerant, the gaseous refrigerant is conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and performs circulating refrigeration according to the gaseous refrigerant.
When a double-source series refrigeration mode is adopted, the four-way valve is powered off, the gas-liquid two-way switching valve is powered off, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the ground water source heat exchanger through the D end and the C end of the four-way valve, the water pump of the ground water source heat exchanger is started, the refrigerant with heat released to a ground water source flows out from the second end of the ground water source heat exchanger and sequentially flows through the second one-way valve and the gas-liquid two-way switching valve, the D end and the C end of the gas-liquid two-way switching valve are communicated, the refrigerant passes through the outdoor air source heat exchanger and is cooled and supercooled by the outdoor fan, the generated low-temperature high-pressure refrigerant flows out from the second end of the outdoor air source heat exchanger and is conveyed to the liquid storage tank through the sixth one-way valve, then is throttled by the first electronic expansion valve to generate low-temperature low-pressure refrigerant, and flows into the indoor heat exchanger through the fourth one-way valve, and utilizing a low-temperature low-pressure refrigerant to cool indoor water to prepare cold water, enabling the refrigerant to flow out from the first end of the indoor heat exchanger after absorbing heat, conveying the cold water to the inlet end of the gas-liquid separator through the E end and the S end of the four-way valve, carrying out gas-liquid separation on the refrigerant through the gas-liquid separator to obtain a gaseous refrigerant, further conveying the gaseous refrigerant to the suction inlet of the compressor from the outlet end of the gas-liquid separator, compressing the sucked gaseous refrigerant by the compressor, and carrying out circulating refrigeration according to the gaseous refrigerant.
When the ground source defrosting mode is adopted, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the indoor heat exchanger through the D end and the E end of the four-way valve, the high-temperature high-pressure refrigerant is utilized, indoor water can be heated by the indoor heat exchanger, the refrigerant after heat release flows out of the second end of the indoor heat exchanger, sequentially flows through the first one-way valve and the gas-liquid two-way switching valve, the gas-liquid two-way switching valve is powered off, the D end and the C end of the gas-liquid two-way switching valve are communicated, the refrigerant flows into the outdoor air source heat exchanger to carry out heat exchange, frosting on the surface of the outdoor air source heat exchanger is melted by utilizing supercooling heat of the refrigerant, low-temperature high-pressure refrigerant flows out of the second end of the outdoor air source heat exchanger, and then the low-temperature high-pressure refrigerant is conveyed to the liquid storage tank through the sixth one-way valve. The low-temperature high-pressure refrigerant in the liquid storage tank is throttled and depressurized through the first electronic expansion valve to generate a low-temperature low-pressure refrigerant, the low-temperature low-pressure refrigerant is further conveyed to the ground water source heat exchanger through the third one-way valve, the low-temperature low-pressure refrigerant flows out of the first end of the ground water source heat exchanger after absorbing the heat of the ground water source, the low-temperature low-pressure refrigerant passes through the C end and the S end of the four-way valve and is conveyed to the inlet end of the gas-liquid separator, the gas-liquid separator is used for carrying out gas-liquid separation on the refrigerant to generate a gaseous refrigerant, the gaseous refrigerant is further conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and circulates according to the cycle.
When an air source heating mode is adopted, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the indoor heat exchanger through the D end and the E end of the four-way valve, the indoor water can be heated by the high-temperature high-pressure refrigerant, the refrigerant after heat release flows out of the second end of the indoor heat exchanger, the refrigerant sequentially flows through the first one-way valve and the gas-liquid two-way switching valve, the gas-liquid two-way valve is electrified, the D end and the E end of the gas-liquid two-way switching valve are communicated, the refrigerant flows into the liquid storage tank through the fifth one-way valve, the second electronic expansion valve is opened, the first electronic expansion valve is closed, the refrigerant flows out of the liquid storage tank, is throttled and depressurized through the second electronic expansion valve to form low-temperature low-pressure refrigerant, the low-temperature low-pressure refrigerant is conveyed to the outdoor air source heat exchanger through the seventh one-way valve, and the low-temperature low-pressure refrigerant flows out of the first end of the outdoor air source heat exchanger through the outdoor fan, the refrigerant is conveyed to the inlet end of the gas-liquid separator through the C end and the S end of the gas-liquid two-way valve, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to generate gaseous refrigerant, the gaseous refrigerant is further conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and circulates according to the gaseous refrigerant.
When a ground source heating mode is adopted, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the indoor heat exchanger through the D end and the E end of the four-way valve, the indoor water can be heated by the high-temperature high-pressure refrigerant, the refrigerant after heat release flows out of the second end of the indoor heat exchanger and sequentially flows through the first one-way valve and the gas-liquid two-way switching valve, the gas-liquid two-way valve is powered on, the D end and the E end of the gas-liquid two-way switching valve are communicated, the refrigerant flows into the liquid storage tank through the fifth one-way valve, the first electronic expansion valve is opened, the second electronic expansion valve is closed, the refrigerant flows out of the liquid storage tank, forms low-temperature low-pressure refrigerant after throttling and pressure reduction through the first electronic expansion valve, and then is conveyed to the ground water source heat exchanger through the third one-way valve, the heat of a ground water source is absorbed and then flows out of the first end of the ground water source heat exchanger, the refrigerant is conveyed to the inlet end of the gas-liquid separator through the C end and the S end of the four-way valve, the refrigerant is subjected to gas-liquid separation through the gas-liquid separator to generate gaseous refrigerant, the gaseous refrigerant is further conveyed to the suction inlet of the compressor from the outlet end of the gas-liquid separator, and the compressor compresses the sucked gaseous refrigerant and circulates according to the gaseous refrigerant.
When a double-source combined heating mode is adopted, the compressor compresses the refrigerant into gaseous high-temperature high-pressure refrigerant to be discharged, the gaseous high-temperature high-pressure refrigerant is conveyed to the indoor heat exchanger through the D end and the E end of the four-way valve, the high-temperature high-pressure refrigerant can be used for heating indoor water, the refrigerant after heat release flows out of the second end of the indoor heat exchanger and sequentially flows through the first one-way valve and the gas-liquid two-way switching valve, the gas-liquid two-way valve is powered on, the D end and the E end of the gas-liquid two-way switching valve are communicated, the refrigerant flows into the liquid storage tank through the fifth one-way valve, the first electronic expansion valve and the second electronic expansion valve are both opened, the refrigerant flows out of the liquid storage tank and is throttled and depressurized through the first electronic expansion valve and the second electronic expansion valve respectively to form first low-temperature low-pressure refrigerant and second low-pressure refrigerant, and the first low-temperature low-pressure refrigerant is conveyed to the ground water source heat exchanger through the third one-way valve, the first low-temperature low-pressure refrigerant and the second low-temperature low-pressure refrigerant are converged in the gas-liquid separator, gas-liquid separation is carried out on the refrigerants through the gas-liquid separator to generate gaseous refrigerants, the gaseous refrigerants are further conveyed to a suction inlet of the compressor from an outlet end of the gas-liquid separator, the compressor compresses the sucked gaseous refrigerants, and heating is carried out in a circulating mode according to the gaseous refrigerants.
Example two
Before the system is started, the working mode of the system is changed or the working mode of the outdoor heat exchanger is changed, the opening degree of the first electronic expansion valve or the second electronic expansion valve is adjusted to be completely closed, so that the refrigerant is pumped back into the gas-liquid separator, and the problem caused by the fact that the refrigerant is retained in a pipeline under the non-working state and the circulating flow of the refrigerant is reduced is avoided.
The specific operation process is as follows:
when the system is executing a ground source heating mode and a user needs to switch to an air source heating mode, the second electronic expansion valve is opened, and then the first electronic expansion valve is reduced to be fully closed, so that the refrigerant passing through the first electronic expansion valve, the ground water source heat exchanger and the non-working state pipeline of the gas-liquid separator is pumped back into the gas-liquid separator.
When the system is executing the air source heating mode and a user needs to switch to the ground source heating mode, the first electronic expansion valve is opened first, and then the second electronic expansion valve is reduced to be fully closed.
When the system is executing a double-source combined heating mode and a user needs to switch to an air source heating mode, the first electronic expansion valve is reduced to be fully closed.
And when the system is executing a double-source combined heating mode and a user needs to switch to a ground source heating mode, the second electronic expansion valve is reduced to be fully closed.
When the system is executing the defrosting mode of heating water and a user needs to switch to the ground source heating mode, the gas-liquid bidirectional switching valve is electrified firstly, so that the S end and the C end of the gas-liquid bidirectional switching valve are communicated, and then the second electronic expansion valve is reduced to be fully closed.
When the system is executing a ground source defrosting mode and a user needs to switch to an air source heating mode, the gas-liquid bidirectional switching valve is electrified firstly, so that the end D and the end E of the gas-liquid bidirectional switching valve are communicated, the second electronic expansion valve is opened, and then the first electronic expansion valve is reduced to be fully closed.
When the system is executing an air source refrigeration mode or a double-source series refrigeration mode, and a user needs to switch to a ground source heating mode, the four-way valve is powered on, so that the end D and the end E of the four-way valve are communicated, a water pump of the ground water source heat exchanger is opened, the gas-liquid two-way switching valve is powered on, so that the end D and the end E of the gas-liquid two-way switching valve are communicated, and then the second electronic expansion valve is reduced to be fully closed.
When the system is executing a ground source refrigeration mode or a dual-source series refrigeration mode, and a user needs to switch to an air source heating mode, the four-way valve is powered on, so that the end D and the end E of the four-way valve are communicated, a water pump of the ground water source heat exchanger is closed, the gas-liquid two-way switching valve is powered on, so that the end D and the end E of the gas-liquid two-way switching valve are communicated, and then the first electronic expansion valve is reduced to be fully closed.
The system executes a ground source heating mode or a double-source combined heating mode, when a user needs to switch to an air source cooling mode, the four-way valve is powered off, so that the D end and the C end of the four-way valve are communicated, a water pump of the ground water source heat exchanger is closed, the gas-liquid two-way switching valve is powered off, the D end and the C end of the gas-liquid two-way switching valve are communicated, and then the first electronic expansion valve is reduced to be fully closed.
The system is executing an air source heating mode or a double-source combined heating mode, when a user needs to switch to a ground source refrigeration mode, the four-way valve is powered off, the end D and the end C of the four-way valve are communicated, and the second electronic expansion valve is reduced to be fully closed.
The system is executing a double-source series refrigeration mode, when a user needs to switch to an air source refrigeration mode, a water pump of the ground water source heat exchanger is closed, and then the first electronic expansion valve is reduced to be fully closed.
The system is executing a double-source series refrigeration mode, when a user needs to switch to a ground source refrigeration mode, the gas-liquid bidirectional switching valve is electrified, the end D and the end E of the gas-liquid bidirectional switching valve are communicated, and the second electronic expansion valve is reduced to be fully closed.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The above-described methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, particularly in accordance with the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the above-described methods may be implemented in any type of computing platform operatively connected to a suitable connection, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein.
A computer program can be applied to input data to perform the functions described herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In embodiments of the present invention, the transformed data represents physical and tangible objects, including particular visual depictions of the physical and tangible objects produced on the display.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (8)

1. A multi-functional dual-source heat pump system characterized in that: comprises a system component and a pipeline component;
the system component comprises a compressor, an indoor heat exchanger, an outdoor air source heat exchanger, a ground water source heat exchanger, a gas-liquid separator, a liquid storage tank, a first electronic expansion valve and a second electronic expansion valve, wherein the ground water source heat exchanger comprises a water pump;
the pipeline assembly comprises a four-way valve, a gas-liquid two-way switching valve, a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve, a sixth one-way valve and a seventh one-way valve, and the four-way valve and the gas-liquid two-way switching valve respectively comprise a D end, an S end, an E end and a C end;
the air suction port of the compressor is connected with the outlet end of the gas-liquid separator, the air exhaust port of the compressor is connected with the D end of the four-way valve, the C end of the four-way valve is connected with the first end of the ground water source heat exchanger, the S end of the four-way valve is connected with the inlet end of the gas-liquid separator, and the E end of the four-way valve is connected with the first end of the indoor heat exchanger;
the second end of the ground water source heat exchanger is connected with the inlet end of a second one-way valve, the outlet end of the second one-way valve is connected with the D end of the gas-liquid two-way switching valve, the S end of the gas-liquid two-way switching valve is connected with the inlet end of the gas-liquid separator, the C end of the gas-liquid two-way switching valve is connected with the first end of the outdoor air source heat exchanger, the second end of the outdoor air source heat exchanger is connected with the inlet end of a sixth one-way valve, and the outlet end of the sixth one-way valve is connected with the inside of the liquid storage tank;
the second end of the outdoor air source heat exchanger is also connected with the outlet end of a seventh one-way valve, and the inlet end of the seventh one-way valve is connected with the inside of the liquid storage tank through a second electronic expansion valve;
the E end of the gas-liquid two-way switching valve is connected with the inlet end of a fifth one-way valve, and the outlet end of the fifth one-way valve is connected with the inside of the liquid storage tank;
the second end of the indoor heat exchanger is connected with the outlet end of a fourth one-way valve, the inlet end of the fourth one-way valve is connected with the inside of the liquid storage tank through a first electronic expansion valve, the second end of the indoor heat exchanger is also connected with the inlet end of the first one-way valve, and the outlet end of the first one-way valve is connected with the D end of the gas-liquid two-way switching valve;
the second end of the ground water source heat exchanger is also connected with the outlet end of a third one-way valve, and the inlet end of the third one-way valve is connected with the inside of the liquid storage tank through a first electronic expansion valve.
2. A multifunctional dual-source heat pump system as recited in claim 1, wherein: the four-way valve and the gas-liquid two-way switching valve are both in a power-on state and a power-off state;
when the four-way valve is in a power-on state, the D end is communicated with the E end, the S end is communicated with the C end, and when the four-way valve is in a power-off state, the D end is communicated with the C end, and the S end is communicated with the E end;
when the gas-liquid bidirectional switching valve is in a power-on state, the D end is communicated with the E end, the S end is communicated with the C end, and when the gas-liquid bidirectional switching valve is in a power-off state, the D end is communicated with the C end, and the S end is communicated with the E end.
3. A multifunctional dual-source heat pump system as recited in claim 2 wherein: the system has a plurality of working modes, wherein the plurality of working modes comprise a ground source refrigeration mode, an air source refrigeration mode and a double-source series refrigeration mode;
in a ground source refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in a power-on state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed;
in an air source refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is closed, the gas-liquid two-way switching valve is in a power-down state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed;
in a double-source series refrigeration mode, the four-way valve is in a power-down state, a water pump of the ground water source heat exchanger is started, the gas-liquid two-way switching valve is in a power-down state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed.
4. A multifunctional dual-source heat pump system as recited in claim 2 wherein: the system is provided with a plurality of working modes, wherein the plurality of working modes comprise a ground source defrosting mode, a ground source heating mode, an air source heating mode and a double-source combined heating mode;
in the ground source defrosting mode, the four-way valve is in a power-on state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in a power-off state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed;
in a ground source heating mode, the four-way valve is in a power-on state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in a power-on state, the first electronic expansion valve is opened, and the second electronic expansion valve is closed;
in the air source heating mode, the four-way valve is in an electrified state, a water pump of the ground water source heat exchanger is closed, the gas-liquid two-way switching valve is in an electrified state, the first electronic expansion valve is closed, and the second electronic expansion valve is opened;
under the double-source combined heating mode, the four-way valve is in an electrified state, a water pump of the ground water source heat exchanger is started, the gas-liquid bidirectional switching valve is in an electrified state, the first electronic expansion valve is opened, and the second electronic expansion valve is opened.
5. A multi-function, dual-source heat pump system as recited in claim 1 wherein: the indoor heat exchanger is a water-cooling heat exchanger, and the outdoor air source heat exchanger is an air-cooling heat exchanger.
6. A multifunctional dual-source heat pump system as recited in claim 5 wherein: the outdoor air source heat exchanger comprises a liquid separator and a fan.
7. A control method of a multifunctional dual-source heat pump system, which adopts the multifunctional dual-source heat pump system as claimed in any one of claims 3 to 4, characterized in that: the working mode of the multifunctional double-source heat pump system is freely selected by a user, and the working states of the four-way valve, the gas-liquid two-way switching valve, the water pump, the first electronic expansion valve and the second electronic expansion valve are controlled according to the working mode selected by the user.
8. A control method of a multifunctional dual-source heat pump system as set forth in claim 7, wherein: when the multifunctional heat pump system is in a ground source refrigeration mode or a double-source series refrigeration mode, the heat of the underground water is exchanged through the ground water source heat exchanger, and the waste heat of the exchanged underground water is recovered.
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