CN109764436B - Heat pump energy storage system for stabilizing short-term fluctuation of intermittent energy - Google Patents
Heat pump energy storage system for stabilizing short-term fluctuation of intermittent energy Download PDFInfo
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- CN109764436B CN109764436B CN201811596991.9A CN201811596991A CN109764436B CN 109764436 B CN109764436 B CN 109764436B CN 201811596991 A CN201811596991 A CN 201811596991A CN 109764436 B CN109764436 B CN 109764436B
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- 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]
- Y02B30/12—Hot water central heating systems using heat pumps
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- 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]
- Y02B30/56—Heat recovery units
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Abstract
The invention discloses a heat pump energy storage system for stabilizing short-term fluctuation of intermittent energy, which comprises a water tank energy storage-taking unit, wherein the water tank energy storage-taking unit comprises a hot water tank and a cold water tank, the hot water tank is connected with a floor heating hot water unit and a domestic hot water unit, the hot water tank is also connected with a heat recovery condenser unit, the heat recovery condenser unit is connected with a double-evaporator unit through a variable frequency compressor and an expansion valve, the double-evaporator unit is connected with the cold water tank, and the cold water tank is connected with an indoor air conditioning unit; the heat pump energy storage system further comprises a control unit, and the control unit is respectively connected with the indoor air conditioning unit, the water tank energy storage-energy taking unit, the double evaporator unit, the heat recovery condenser unit and the variable frequency compressor. The invention solves the problem of the consumption of short-period intermittent renewable energy fluctuation, and simultaneously improves the refrigeration and heating efficiency of the heat pump system under the fixed working condition.
Description
Technical Field
The invention relates to a heat recovery type heat pump system, in particular to a heat pump energy storage system for stabilizing short-term fluctuation of intermittent energy.
Background
Because the use of traditional energy can cause environmental problems such as greenhouse effect, air pollution and the like, the use amount of clean energy such as photovoltaic power generation and the like is greatly increased. At present, one of the utilization modes is to supply power to electrical appliances such as household appliances in life through photovoltaic power generation.
The heat pump is used as an efficient energy-saving device for fully utilizing low-grade heat energy, can enable heat to flow from a low-temperature object to a high-temperature object in a reverse circulation mode, consumes a small amount of mechanical work, obtains larger heat, and can effectively utilize the low-grade heat energy which is difficult to apply to achieve the purpose of energy conservation.
However, photovoltaic power generation systems have their own problems: the output electric energy is influenced by environmental factors such as illumination intensity, temperature fluctuation and the like, and has larger fluctuation in a short time. At present, some heat pumps adopt a mode of combining photovoltaic power generation and a storage battery for power supply, and when the output power of the photovoltaic power generation is greater than the rated operation power of a compressor, the surplus part is charged into the storage battery. And when the photovoltaic power generation output power is smaller than the rated operation power of the compressor, compensating by using the electricity in the storage battery. Because the storage battery has power loss in the charging and discharging processes, the heat pump system cannot fully utilize the power of photovoltaic power generation, and a large part of waste exists. Therefore, the problem of low utilization rate of photovoltaic power generation power in a short period by the heat pump system needs to be solved.
Furthermore, the common household air conditioner mostly adopts a heat pump type air conditioner without heat recovery, which has certain defects: in summer, the indoor unit of the air conditioner produces cold energy, heat is discharged to the air through the outdoor unit, the condensation heat cannot be effectively utilized, and the heat island effect of the city is aggravated by discharging waste heat to the air. Therefore, it is necessary to solve the problem of low utilization rate of the condensation heat of the general heat pump type air conditioner.
There is also a need in the development to address the balance of refrigeration and heating capacity: in some heat recovery heat pump air conditioners, cooling and heating are always maintained while operating, an evaporator absorbs heat from a water tank, and a condenser releases heat to water in the hot water tank. However, when the requirement of cold and hot water temperature is met, compared with the common heat pump water heater, the evaporation temperature is lower, and compared with the working condition of the common refrigeration air conditioner, the condensation temperature is higher, so that the refrigeration and heating efficiency of the unit is reduced, and the energy consumption is higher.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a heat pump energy storage system for stabilizing short-term fluctuation of intermittent energy, and solves the problems of low utilization rate of photovoltaic power generation power in a short term, low refrigeration and heating efficiency and high energy consumption in the prior art.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
the heat pump energy storage system for stabilizing the short-term fluctuation of the intermittent energy comprises a water tank energy storage-taking unit, wherein the water tank energy storage-taking unit comprises a hot water tank and a cold water tank, the hot water tank is connected with a floor heating hot water unit and a domestic hot water unit, the hot water tank is also connected with a heat recovery condenser unit, the heat recovery condenser unit is connected with a double evaporator unit through a variable frequency compressor and an expansion valve, the double evaporator unit is connected with the cold water tank, and the cold water tank is connected with an indoor air conditioning unit; the heat pump energy storage system further comprises a control unit, and the control unit is respectively connected with the indoor air conditioning unit, the water tank energy storage-energy taking unit, the double evaporator unit, the heat recovery condenser unit and the variable frequency compressor.
Further, the heat pump energy storage system further comprises a first electromagnetic valve and a water pump, the water tank energy storage-energy taking unit further comprises a variable frequency water pump and a variable frequency water pump, the first output end and the first input end of the cold water tank are respectively connected with the indoor air conditioning unit, the second input end of the cold water tank is connected with the double-evaporator unit, the second output end of the cold water tank is connected with the double-evaporator unit through the variable frequency water pump, the first input end of the hot water tank is connected with the heat recovery condenser unit through the variable frequency water pump, the first output end of the hot water tank is connected with the heat recovery condenser unit, the second output end of the hot water tank is respectively connected with the input end of the domestic hot water unit and one end of the first electromagnetic valve, the other end of the first electromagnetic valve is connected with the input end of the floor heating hot water unit.
Further, the double-evaporator unit comprises a plate heat exchanger, a first secondary refrigerant output end of the plate heat exchanger is connected with a second input end of a cold water tank, a first secondary refrigerant input end of the plate heat exchanger is connected with a variable frequency water pump, a first output end and a first input end of the cold water tank are respectively connected with an indoor air conditioning unit, a first refrigerant output end of the plate heat exchanger is respectively connected with an input end of a variable frequency compressor and an output end of an air-cooled fin heat exchanger, a first refrigerant input end of the plate heat exchanger is respectively connected with one end of a third electromagnetic valve and one end of an expansion valve after passing through a second electromagnetic valve, the other end of the third electromagnetic valve is connected with an input end of the air-cooled fin heat exchanger, one side of the air-cooled fin heat.
Further, the heat recovery condenser unit comprises a plate heat exchanger, a second refrigerant input end of the plate heat exchanger is connected with an output end of the variable frequency compressor, a second refrigerant output end of the plate heat exchanger is connected with an input end of the air-cooled fin heat exchanger, an output end of the air-cooled fin heat exchanger is connected with the other end of the expansion valve, a variable frequency fan is arranged on one side of the air-cooled fin heat exchanger, a second secondary refrigerant output end of the plate heat exchanger is connected with a variable frequency water pump, and a second secondary refrigerant input end of the plate heat exchanger is connected with a first output end of.
Further, the indoor air conditioning unit comprises an air-cooled fin heat exchanger, the output end of the air-cooled fin heat exchanger is connected with the first input end of the cold water tank through a variable frequency water pump, the input end of the air-cooled fin heat exchanger is connected with the first output end of the cold water tank, and a variable frequency fan is arranged on one side of the air-cooled fin heat exchanger.
Further, the control unit comprises a controller, a temperature signal probe arranged in indoor air, a temperature signal probe arranged in a cold water tank and a temperature signal probe arranged in a hot water tank, wherein the controller is respectively connected with a third electromagnetic valve, a second electromagnetic valve, a first electromagnetic valve, a variable frequency fan, a variable frequency water pump, a variable frequency compressor.
Further, the control unit controls the second electromagnetic valve to be opened, the third electromagnetic valve and the first electromagnetic valve to be closed in summer, and controls the third electromagnetic valve to be opened, the second electromagnetic valve to be closed and the first electromagnetic valve to be opened in winter.
Has the advantages that: the invention discloses a heat pump energy storage system for stabilizing short-term fluctuation of intermittent energy, which has the following beneficial effects compared with the prior art:
(1) renewable intermittent energy sources such as wind, light and the like are absorbed by the variable frequency compressor, so that the influence caused by fluctuation of the intermittent energy sources in a short period is eliminated, a cold and hot load is provided for a user, and energy consumption is saved;
(2) the output power of photovoltaic power generation is directly used for supplying power to the variable frequency compressor, and compared with the traditional mode of combined power supply of photovoltaic power generation and a storage battery, the utilization rate of the output power of photovoltaic power generation in a short period can be effectively improved, and the electric power loss is reduced;
(3) the waste heat of the traditional air conditioner is recovered and used for heating hot water, so that the energy consumption for heating the hot water is saved, and the urban heat island effect is favorably slowed down;
(4) the refrigerant exchanges heat with water in the hot water tank through the plate heat exchanger to heat the temperature of the water in the hot water tank, and then secondary heat dissipation is carried out through the air-cooled condenser, so that the total refrigerating capacity is improved on the basis of ensuring the total heating capacity;
(5) different heat recovery operation modes are adopted according to whether a user is in a room or not, so that the refrigerating and heating efficiency under a single operation mode is improved.
Drawings
FIG. 1 is a schematic diagram of a system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic illustration of short term photovoltaic fluctuation characteristics in an embodiment of the present invention;
FIG. 3 is a graph showing the change in room temperature according to an embodiment of the present invention;
FIG. 4 is a voltage variation curve of the adjustment speed of the variable frequency fan according to the embodiment of the present invention;
FIG. 5 is a voltage variation curve of the modulation speed of the inverter compressor according to the embodiment of the present invention;
fig. 6 is a water temperature change curve of the cold water tank in the embodiment of the invention.
Detailed Description
The technical solution of the present invention will be further described with reference to the following embodiments.
The specific embodiment discloses a heat pump energy storage system for stabilizing short-term fluctuation of intermittent energy, which comprises a water tank energy storage-taking unit as shown in figure 1, wherein the water tank energy storage-taking unit comprises a hot water tank 17 and a cold water tank 3, the hot water tank 17 is connected with a floor heating hot water unit and a domestic hot water unit, the hot water tank 17 is also connected with a heat recovery condenser unit, the heat recovery condenser unit is connected with a double-evaporator unit through a variable frequency compressor 20 and an expansion valve 11, the double-evaporator unit is connected with the cold water tank 3, and the cold water tank 3 is connected with an indoor air conditioning unit; the heat pump energy storage system further comprises a control unit, and the control unit is respectively connected with the indoor air conditioning unit, the water tank energy storage-energy taking unit, the double evaporator unit, the heat recovery condenser unit and the variable frequency compressor 20.
The heat pump energy storage system further comprises a first electromagnetic valve 14 and a water pump 19, the water tank energy storage-energy taking unit further comprises a variable frequency water pump 16 and a variable frequency water pump 5, the first output end and the first input end of the cold water tank 3 are respectively connected with the indoor air conditioning unit, the second input end of the cold water tank 3 is connected with the double-evaporator unit, the second output end of the cold water tank 3 is connected with the double-evaporator unit through the variable frequency water pump 5, the first input end of the hot water tank 17 is connected with the heat recovery condenser unit through the variable frequency water pump 16, the first output end of the hot water tank 17 is connected with the heat recovery condenser unit, the second output end of the hot water tank 17 is respectively connected with the input end of the domestic hot water unit and one end of the first electromagnetic valve 14, the other end of the first electromagnetic valve 14 is connected with the input end of the floor heating hot water unit.
The double-evaporator unit comprises a plate type heat exchanger 6, a first secondary refrigerant output end of the plate type heat exchanger 6 is connected with a second input end of a cold water tank 3, a first secondary refrigerant input end of the plate type heat exchanger 6 is connected with a variable frequency water pump 5, a first output end and a first input end of the cold water tank 3 are respectively connected with an indoor air conditioning unit, a first refrigerant output end of the plate type heat exchanger 6 is respectively connected with an input end of a variable frequency compressor 20 and an output end of an air-cooled fin heat exchanger 8, a first refrigerant input end of the plate type heat exchanger 6 is respectively connected with one end of a third electromagnetic valve 9 and one end of an expansion valve 11 after passing through a second electromagnetic valve 10, the other end of the third electromagnetic valve 9 is connected with an input end of the air-cooled fin heat exchanger 8, one side of the.
The heat recovery condenser unit comprises a plate heat exchanger 15, a second refrigerant input end of the plate heat exchanger 15 is connected with an output end of a variable frequency compressor 20, a second refrigerant output end of the plate heat exchanger 15 is connected with an input end of an air-cooled fin heat exchanger 13, an output end of the air-cooled fin heat exchanger 13 is connected with the other end of an expansion valve 11, a variable frequency fan 12 is arranged on one side of the air-cooled fin heat exchanger 13, a second secondary refrigerant output end of the plate heat exchanger 15 is connected with a variable frequency water pump 16, and a second secondary refrigerant input end of the plate heat exchanger 15 is connected with a first output end.
The indoor air conditioning unit comprises an air-cooled fin heat exchanger 1, the output end of the air-cooled fin heat exchanger 1 is connected with the first input end of a cold water tank 3 through a variable-frequency water pump 2, the input end of the air-cooled fin heat exchanger 1 is connected with the first output end of the cold water tank 3, and a variable-frequency fan 22 is arranged on one side of the air-cooled fin heat exchanger 1.
The control unit comprises a controller, a temperature signal probe 21 arranged in indoor air, a temperature signal probe 4 arranged in the cold water tank 3 and a temperature signal probe 18 arranged in the hot water tank 17, wherein the controller is respectively connected with the third electromagnetic valve 9, the second electromagnetic valve 10, the first electromagnetic valve 14, the variable frequency fan 22, the variable frequency fan 12, the variable frequency water pump 2, the variable frequency water pump 5, the variable frequency water pump 16 and the variable frequency compressor 20.
The control unit controls the second electromagnetic valve 10 to be opened in summer, the third electromagnetic valve 9 and the first electromagnetic valve 14 to be closed, and controls the third electromagnetic valve 9 to be opened, the second electromagnetic valve 10 to be closed and the first electromagnetic valve 14 to be opened in winter.
Fig. 2 is a schematic diagram depicting short-term fluctuation characteristics of photovoltaic power generation. The output power of the photovoltaic power generation is greatly influenced by weather conditions, the power is high when the illumination is sufficient, and the power is low when the illumination is insufficient, so that the photovoltaic power generation has the characteristic of intermittent fluctuation.
1. The invention automatically controls the air conditioning unit through the control unit, takes a summer operation mode as an example, keeps the indoor temperature at a set temperature of 26 ℃, and adjusts the rotating speed of the variable frequency fan 22 in a negative feedback mode by using a PID controller, wherein the PID controller only uses two terms of proportion and integral, and the parameter is set as KP＝4.615，Ki-0.05722. When the temperature signal probe 4 detects the hot water tank 3When the water temperature is reduced to 12 ℃, the control unit starts the variable frequency fan 22, and adjusts the rotating speed of the variable frequency fan 22 and the rotating speed of the variable frequency water pump 2 according to the temperature at the temperature signal probe 4 in real time, so that the comprehensive effect of the temperature and the wind speed of the wind blown out by the variable frequency fan 22 is in a human body comfort range area. The temperature signal probe 21 delivers the indoor temperature value to the control unit for comparison with the set temperature. When the indoor temperature is higher than the set temperature, the control unit increases the rotation speed of the variable frequency fan 22, and the rotation speed of the variable frequency fan 22 gradually decreases as the difference between the indoor temperature and the set temperature decreases. The rotating speed of the variable frequency fan 22 is adjusted by inputting a 0-5V voltage signal to the variable frequency fan, and the magnitude of the voltage signal reflects the rotating speed of the variable frequency fan 22. When the system reaches a steady state, the room temperature is maintained at 26 ℃, the change curve of the room temperature is shown in fig. 3, and the change curve of the voltage value of the adjusting rotating speed input by the variable frequency fan 22 is shown in fig. 4.
2. The invention changes the rotating speed of the variable frequency compressor 20 through the control unit, stabilizes the short-term fluctuation of photovoltaic power generation and realizes dynamic energy storage. The inverter compressor 20 is powered by photovoltaic power generation, when the power of the photovoltaic power generation is greater than the rated power of the inverter compressor 20, the rotating speed of the inverter compressor 20 is increased, the temperature of the cold water tank 3 is reduced, the total refrigerating capacity of the system is improved at the moment, the rotating speed of the inverter fan 22 is reduced by the control unit, the indoor temperature is kept unchanged, and the energy storage mode is adopted at the moment. When the photovoltaic power generation power is smaller than the rated power of the inverter compressor 20, the input power of the inverter compressor 20 is smaller, and the rotating speed of the inverter compressor 20 is reduced, so that the total refrigerating capacity is reduced, and the energy obtaining mode is adopted at this time. The control unit increases the rotating speed of the variable frequency fan 22, and the cold air in the cold water tank 3 is conveyed to the indoor through the air conditioning unit, so that the requirement of a user is met. The input power curve of the inverter compressor 20 is approximated to a sinusoidal curve reflecting the short-term fluctuation characteristics of photovoltaic power generation, as shown in fig. 5. When the system reaches a steady state, the water temperature of the cold water tank 3 changes as shown in fig. 6, and periodically fluctuates at 5 ℃ or higher to reflect the energy storage capacity.
3. The double-evaporator unit of the invention performs the conversion of the evaporator in summer and winter. In summer, the outdoor temperature is high, the second electromagnetic valve 10 is closed, the third electromagnetic valve 9 is opened, the plate heat exchanger 6 is adopted on the evaporator side, water is used as secondary refrigerant, and dynamic energy storage can be realized. In winter, the third electromagnetic valve 9 is closed, the second electromagnetic valve 10 is opened, the air-cooled fin heat exchanger 8 is adopted on the evaporator side, the constant-speed fan 7 is opened, and the refrigerant absorbs heat from the air, namely, the air source heat pump operation mode is adopted.
4. In summer, the control unit adjusts the rotating speed of the variable-frequency fan 12 of the heat recovery condenser unit according to the user requirement, and the refrigeration efficiency and the heating efficiency under the set working condition are improved under the condition that the total refrigeration quantity and the total heating quantity are met. The specific operation mode is adjusted according to the use state of the user.
When the user leaves the room, the switch of the air conditioning unit is closed, the control unit closes the variable-frequency water pump 2, the variable-frequency fan 22 and the variable-frequency fan 12, and the heat recovery condenser unit performs partial heat recovery, wherein the heat recovery amount is increased compared with the case that the variable-frequency fan 12 is turned on. The supercooling degree of the refrigerant at the output end of the air-cooled fin heat exchanger 13 is reduced, the unit refrigerating capacity in the plate evaporator 6 is reduced, and the temperature drop speed of the cold water tank 3 is reduced. Since the heat dissipation amount of the air-cooled fin heat exchanger 13 is reduced, the recovered heat is used to raise the temperature of water in the hot water tank 17, and the total heating amount is increased compared to when the variable frequency fan 12 is turned on. The temperature signal probe 18 transmits the water temperature in the hot water tank 17 to the control unit, when the water temperature is increased to 50 ℃, the control unit closes the compressor 20, the variable frequency water pump 5 and the variable frequency water pump 16, the system stops running, and heat preservation is carried out.
When a user returns to a room, the switch of the air conditioning unit is turned on, the control unit turns on the variable-frequency compressor 20, the variable-frequency water pump 5, the variable-frequency water pump 16, the variable-frequency water pump 2 and the variable-frequency fan 22, the rotating speed of the variable-frequency fan 12 is adjusted to be maximum, and the heat recovery condenser unit performs partial heat recovery. At this time, the heat dissipation capacity of the air-cooled fin heat exchanger 13 is increased to the maximum, the supercooling degree of the refrigerant at the output end of the air-cooled fin heat exchanger 13 is increased, the unit cooling capacity in the plate heat exchanger 6 is increased, the temperature reduction speed of the cold water tank 3 is increased, the evaporation temperature is reduced, so that the condensation temperature of the plate heat exchanger 15 is reduced, the unit heating capacity is reduced, and the total cooling capacity is improved compared with the total heat recovery mode. The control unit reduces the rotating speed of the variable frequency fan 22 according to the temperature signal of the temperature signal probe 4, so that the indoor temperature is kept constant, and the refrigeration requirement of a user is met. At this time, the hot water tank 17 is heated to a higher temperature in the full heat recovery mode, and can be used by a domestic hot water unit and a floor heating hot water unit, so that the hot water requirement of a user is met.
Claims (6)
1. A heat pump energy storage system for stabilizing short-term fluctuation of intermittent energy is characterized in that: the energy storage and taking unit comprises a hot water tank (17) and a cold water tank (3), wherein the hot water tank (17) is connected with a floor heating hot water unit and a domestic hot water unit, the hot water tank (17) is also connected with a heat recovery condenser unit, the heat recovery condenser unit is connected with a double-evaporator unit through a variable frequency compressor (20) and an expansion valve (11), the double-evaporator unit is connected with the cold water tank (3), and the cold water tank (3) is connected with an indoor air conditioning unit; the heat pump energy storage system also comprises a control unit, wherein the control unit is respectively connected with the indoor air conditioning unit, the water tank energy storage-energy taking unit, the double evaporator unit, the heat recovery condenser unit and the variable frequency compressor (20);
the heat pump energy storage system further comprises a first electromagnetic valve (14) and a water pump (19), the water tank energy storage-energy taking unit further comprises a variable frequency water pump (16) and a variable frequency water pump (5), a first output end and a first input end of the cold water tank (3) are respectively connected with the indoor air conditioning unit, a second input end of the cold water tank (3) is connected with the double-evaporator unit, a second output end of the cold water tank (3) is connected with the double-evaporator unit through the variable frequency water pump (5), a first input end of the hot water tank (17) is connected with the heat recovery condenser unit through the variable frequency water pump (16), a first output end of the hot water tank (17) is connected with the heat recovery condenser unit, a second output end of the hot water tank (17) is respectively connected with an input end of the domestic hot water unit and one end of the first electromagnetic valve (14), and the other end of, the second input end of the hot water tank (17) is connected with the output end of the domestic hot water unit and the output end of the floor heating hot water unit through a water pump (19).
2. The heat pump energy storage system for stabilizing short-term fluctuations in intermittent energy according to claim 1, wherein: the double-evaporator unit comprises a plate type heat exchanger (6), a first secondary refrigerant output end of the plate type heat exchanger (6) is connected with a second input end of a cold water tank (3), a first secondary refrigerant input end of the plate type heat exchanger (6) is connected with a variable frequency water pump (5), a first output end and a first input end of the cold water tank (3) are respectively connected with an indoor air conditioning unit, a first refrigerant output end of the plate type heat exchanger (6) is respectively connected with an input end of a variable frequency compressor (20) and an output end of an air-cooled fin type heat exchanger (8), a first refrigerant input end of the plate type heat exchanger (6) is respectively connected with one end of a third electromagnetic valve (9) and one end of an expansion valve (11) after passing through a second electromagnetic valve (10), the other end of the third electromagnetic valve (9) is connected with an input end of the air-cooled fin type heat exchanger (8), the other end of the expansion valve (11) is connected to a heat recovery condenser unit.
3. The heat pump energy storage system for stabilizing short-term fluctuations in intermittent energy according to claim 2, characterized in that: the heat recovery condenser unit comprises a plate heat exchanger (15), wherein the second refrigerant input end of the plate heat exchanger (15) is connected with the output end of a variable frequency compressor (20), the second refrigerant output end of the plate heat exchanger (15) is connected with the input end of an air-cooled fin heat exchanger (13), the output end of the air-cooled fin heat exchanger (13) is connected with the other end of an expansion valve (11), one side of the air-cooled fin heat exchanger (13) is provided with a variable frequency fan (12), the second secondary refrigerant output end of the plate heat exchanger (15) is connected with a variable frequency water pump (16), and the second secondary refrigerant input end of the plate heat exchanger (15) is connected with the first output end of a hot water tank.
4. The heat pump energy storage system for stabilizing short-term fluctuations in intermittent energy according to claim 3, characterized in that: the indoor air conditioning unit comprises an air-cooled fin heat exchanger (1), the output end of the air-cooled fin heat exchanger (1) is connected with the first input end of a cold water tank (3) through a variable-frequency water pump (2), the input end of the air-cooled fin heat exchanger (1) is connected with the first output end of the cold water tank (3), and a variable-frequency fan (22) is arranged on one side of the air-cooled fin heat exchanger (1).
5. The heat pump energy storage system for stabilizing short-term fluctuations in intermittent energy according to claim 4, characterized in that: the control unit comprises a controller, a temperature signal probe (21) arranged in indoor air, a temperature signal probe (4) arranged in a cold water tank (3) and a temperature signal probe (18) arranged in a hot water tank (17), wherein the controller is respectively connected with a third electromagnetic valve (9), a second electromagnetic valve (10), a first electromagnetic valve (14), a variable frequency fan (22), a variable frequency fan (12), a variable frequency water pump (2), a variable frequency water pump (5), a variable frequency water pump (16) and a variable frequency compressor (20).
6. The heat pump energy storage system for stabilizing short-term fluctuations in intermittent energy according to claim 5, wherein: the control unit controls the second electromagnetic valve (10) to be opened in summer, the third electromagnetic valve (9) and the first electromagnetic valve (14) to be closed, and controls the third electromagnetic valve (9) to be opened, the second electromagnetic valve (10) to be closed and the first electromagnetic valve (14) to be opened in winter.
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