Cross-seasonal energy storage heat supply system and phase change cold storage method

Abstract

The invention relates to the technical field of heat pump heat supply, and discloses a cross-seasonal energy storage heat supply system and a phase change cold storage method.The cross-seasonal energy storage heat supply system comprises a carbon dioxide heat pump working medium circulation path or an environment-friendly working medium circulation path, and further comprises a cold storage working medium circulation path and an air conditioner circulation path; environment-friendly working media such as carbon dioxide or propane are in direct contact with a cold storage working medium for heat exchange, solidification phase change heat of the cold storage working medium is absorbed for heating, the solidified cold storage working medium is stored in a heat preservation and insulation storage tank, and in summer, an air conditioner adopts the solidified cold storage working medium to circularly release cold energy; in the transition season, solar energy, industrial waste heat and the like are adopted to heat a cold storage medium in the storage tank, in the heat supply season, stored heat energy is firstly used for supplying heat, and then a heat pump ice-making heat taking and heating mode is switched into. Compared with a traditional heat pump, the low-temperature end and the high-temperature end of the heat pump are utilized at the same time, composite and dual effects are achieved, and the energy efficiency of a heat pump system is remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat pump heating, and in particular relates to a cross-seasonal energy storage heating system and a phase change cold storage method. Background Art

[0002] Heat pumps have been widely used in heating and air conditioning of buildings. Air source heat pump is a type of heat pump. It absorbs heat from the air through the evaporation and vaporization of refrigerant in the evaporator. The generated refrigerant gas is sucked into the compressor and compressed into a gas with higher pressure and temperature. It enters the condenser to condense and release heat to heat the building. The condensed liquid refrigerant is throttled and depressurized by the throttle valve, and then enters the evaporator again to absorb heat from the ambient air. It becomes steam again and is sucked and compressed by the compressor.

[0003] The disadvantage of air source heat pumps is that when heating in winter, the surface of the outdoor heat exchanger (evaporator) is frosted, affecting the heating effect and heating performance. When the ambient temperature drops, the heating load of the house increases, but the heating performance of the heat pump decreases, which is contrary to the trend of house load demand changes. The lower the temperature, the more serious the performance deterioration, which forms a fundamental contradiction with the heating demand of the house. In the summer air conditioning season, while the heat pump cools the house, it also releases a large amount of waste heat to the environment. Therefore, this current periodic operation mode of the heat pump has a series of deficiencies and needs to be improved.

[0004] Considering that water has a high phase change heat when it changes phase, and its solidification and melting temperatures are mostly within the operating range of heat pumps with high operating efficiency, the phase change of water can be used to provide heat through heat pumps on the one hand, and to store cold by using the phase change of the working fluid at the same time, to meet the needs of buildings in winter and summer. However, the energy consumption of the supercooled water ice making cycle is large, and the coil ice making has a large heat transfer resistance and high cost.

[0005] The invention of CN103712255A, "A cross-season solar energy-phase change energy storage and graded energy release heating system and method", informs: the system mainly includes a solar collector, a phase change storage heat exchanger, a heating module, and a heat exchanger, and each component is connected together through pipes, valves, and a circulating pump. In the non-heating season, solar thermal energy is stored in phase change materials at different temperatures that can achieve stable supercooling, so that it can be left to stand in a supercooled liquid state; in the heating season, two modes can be achieved: direct heat exchange between heat medium water and the collector to provide heat load, and direct heat exchange between heat medium water and the phase change storage heat exchanger to provide heat load. The load levels at different stages trigger the solidification and energy release of phase change material units at different temperatures. The system uses the idea of ​​cross-season phase change heat storage and graded energy release to provide winter heat load, and has the characteristics of large phase change latent heat, relatively stable heat release temperature, and graded adjustment. The system structure is relatively complex, and its performance needs to be improved. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a cross-seasonal energy storage heating system and a phase change cold storage method, which is used to heat the building by raising the temperature of the working fluid through the phase change heat of the heat pump. At the same time, the working fluid after the phase change is used as a cold storage working fluid to store cold energy for use in summer air conditioning, effectively improving the performance of the heat pump air conditioning system.

[0007] In order to solve the above technical problems, the present invention provides a cross-seasonal energy storage heating system, comprising: an environmental protection working medium circulation path and a cold storage working medium circulation path;

[0008] The environmentally friendly working medium circulation path includes: the first compressor is connected to the first compressor in sequence through the third condenser, the drying filter, the second throttle valve, the gas-liquid contactor, the first gas-liquid separator, the first switch valve and the first compressor;

[0009] The cold storage medium circulation path includes: the gas-liquid contactor is connected with the sprayer through the third regulating valve, the second expansion end, the storage tank, the second compression end, the first pump, the second regulating valve in sequence.

[0010] The present invention also provides another cross-season energy storage heating system: comprising a carbon dioxide heat pump circulation path, a cold storage medium circulation path and a conventional heat pump circulation path;

[0011] The carbon dioxide heat pump circulation path includes: the first compressor is divided into two paths after passing through the cooler, respectively passing through the evaporative condenser and the first condenser and then merged into one path, and then connected to the first compressor through the first regulating valve, the first expansion end, the gas-liquid contactor, the first gas-liquid separator, the first compression end, and the first switch valve;

[0012] The cold storage medium circulation path includes: the gas-liquid contactor is connected to the sprayer through the third regulating valve, the second expansion end, the storage tank, the second compression end, the first pump, the second regulating valve in sequence;

[0013] The conventional heat pump circulation path includes: the evaporative condenser is connected to the evaporative condenser after passing through the second gas-liquid separator, the second compressor, the second condenser, the liquid storage tank, the drying filter and the first throttle valve in sequence.

[0014] As another improvement of the cross-seasonal energy storage heating system:

[0015] The storage tank is connected to the auxiliary heating circulation passage: the storage tank is connected to the storage tank after passing through the fifth regulating valve, the third pump, the solar waste heat heater and the fourth regulating valve in sequence.

[0016] As another improvement of the cross-seasonal energy storage heating system:

[0017] The storage tank is connected to the dehumidification solution passage: the storage tank passes through the third switch valve, the fourth pump, the solution storage tank, the fifth pump, and the fourth switch valve in sequence, and is connected to the pipeline between the first pump and the second regulating valve, and merges into the cold storage working medium circulation passage;

[0018] The solution storage tank is also connected to the dehumidification air conditioning circulation passage: the solution storage tank is connected to the solution storage tank after passing through the sixth pump, the fifth switch valve and the dehumidification air conditioning.

[0019] As a further improvement of the cross-seasonal energy storage heating system:

[0020] The storage tank is connected to the air conditioning circulation path: the storage tank is connected to the storage tank through the second switch valve, the second pump, the first air conditioning terminal, the second air conditioning terminal and the storage tank in sequence;

[0021] The cooler and the second condenser are both connected to the heating circuit on the user side;

[0022] The sprayer is located at the top of the inner cavity of the gas-liquid contactor.

[0023] The present invention also provides a phase change cold storage method for a cross-seasonal energy storage heating system:

[0024] S1, heat pump ice making and heating mode

[0025] The environmentally friendly working fluid flows along the environmentally friendly working fluid circulation passage, exchanges heat with the heating working fluid when flowing through the third condenser, the environmentally friendly working fluid releases heat and condenses into liquid, and the heating working fluid absorbs heat and heats up for external heating; when the environmentally friendly working fluid flows through the gas-liquid contactor, it exchanges heat with the cold storage working fluid in the cold storage working fluid circulation passage, and the environmentally friendly working fluid absorbs heat and vaporizes; when flowing through the first compressor, the environmentally friendly working fluid is compressed into high-temperature and high-pressure gas;

[0026] The cold storage medium flows along the cold storage medium circulation passage, flows through the gas-liquid contactor, and is sprayed down from the sprayer, exchanging heat with the environmentally friendly medium in the environmentally friendly medium circulation passage, and the cold storage medium is cooled and solidified into a liquid-solid mixture; the solid matter in the cold storage medium is continuously accumulated at the upper part of the storage tank, and the liquid cold storage medium flows out from the lower part of the storage tank;

[0027] S2, air conditioning cycle mode

[0028] The liquid cold storage medium at the bottom of the storage tank is pressurized by the second pump, and returns to the storage tank from the top after absorbing heat at the first air-conditioning terminal and the second air-conditioning terminal.

[0029] The present invention also provides another phase change cold storage method for a cross-seasonal energy storage heating system:

[0030] S1, heat pump ice making and heating mode

[0031] The carbon dioxide flows along the carbon dioxide heat pump circulation path, exchanges heat with the heating medium when flowing through the cooler, and the carbon dioxide releases heat and condenses into liquid, while the heating medium absorbs heat and heats up for external heating; the carbon dioxide releases heat and condenses into liquid when flowing through the evaporative condenser and the first condenser, and exchanges heat with the cold storage medium in the cold storage medium circulation path when flowing through the gas-liquid contactor, and the carbon dioxide absorbs heat and gasifies; when flowing through the first compressor, it is compressed into high-temperature and high-pressure gas;

[0032] The cold storage medium flows along the cold storage medium circulation passage, flows through the gas-liquid contactor, and is sprayed down from the sprayer, and exchanges heat with the carbon dioxide in the carbon dioxide heat pump circulation passage. The cold storage medium is cooled and solidified into a liquid and solid mixture; the solid cold storage medium is continuously accumulated on the upper part of the storage tank, and the liquid cold storage medium flows out from the lower part of the storage tank;

[0033] The refrigerant flows along the conventional heat pump circulation path, exchanges heat with the carbon dioxide in the carbon dioxide heat pump circulation path when flowing through the evaporative condenser, absorbs heat and then heats up and vaporizes; flows through the second compressor and is compressed into high-temperature and high-pressure gas; flows through the second condenser and exchanges heat with the heating working medium, the refrigerant releases heat and condenses into liquid, and the heating working medium absorbs heat and heats up and is used for external heating;

[0034] S2, air conditioning cycle mode

[0035] The liquid cold storage medium at the bottom of the storage tank is pressurized by the second pump, and returns to the storage tank from the top after absorbing heat at the first air-conditioning terminal and the second air-conditioning terminal.

[0036] As another improvement of the phase change cold storage method of the cross-seasonal energy storage heating system:

[0037] The auxiliary heating mode is operated in the transition season. In winter, the air conditioning heating mode is operated first, and then the heat pump ice making and heating mode is operated; in summer, the air conditioning cooling mode is operated;

[0038] The auxiliary heating mode is mainly as follows: the cold storage medium in the storage tank flows along the auxiliary heating circulation path, flows through the solar waste heat heater, exchanges heat with the external auxiliary heating medium to increase the temperature, and then returns to the storage tank to store heat;

[0039] The main air conditioning heating mode is: the cold storage medium in the storage tank enters the air conditioning system after being pressurized by the second pump, and returns to the storage tank from the top after releasing heat at the first air conditioning terminal and the second air conditioning terminal.

[0040] As another further improvement of the phase change cold storage method of the cross-seasonal energy storage heating system:

[0041] S1, heat pump ice making and heating mode

[0042] The carbon dioxide flows along the carbon dioxide heat pump circulation path, exchanges heat with the heating medium when flowing through the cooler, and the carbon dioxide releases heat and condenses into liquid, while the heating medium absorbs heat and heats up for external heating; the carbon dioxide releases heat and condenses into liquid when flowing through the evaporative condenser and the first condenser, and exchanges heat with the dehumidification solution in the cold storage medium circulation path when flowing through the gas-liquid contactor, and the carbon dioxide absorbs heat and gasifies; the carbon dioxide is compressed into high-temperature and high-pressure gas when flowing through the first compressor;

[0043] The dehumidification solution flows along the cold storage medium circulation passage and the dehumidification solution passage, flows through the gas-liquid contactor and is sprayed down from the sprayer, and exchanges heat with the carbon dioxide in the carbon dioxide heat pump circulation passage. The dehumidification solution releases heat and cools down to become a mixture of ice, concentrated solution, and hydrated salt; the concentrated solution and hydrate with higher density in the mixture gather at the bottom of the storage tank and then enter the dehumidification solution passage, the dilute solution with lower density in the mixture flows out at the lower part of the storage tank and continues to participate in the circulation of the cold storage medium circulation passage, and the solid ice in the mixture gradually accumulates at the upper part of the storage tank; in the solution storage tank, the high-density part further gathers at the lower part of the solution storage tank, and the low-density part flows out from the upper part of the solution storage tank and merges into the cold storage medium circulation passage;

[0044] The refrigerant flows along the conventional heat pump circulation path, exchanges heat with the carbon dioxide in the carbon dioxide heat pump circulation path when flowing through the evaporative condenser, absorbs heat and then heats up to gasify; flows through the second compressor and is compressed into high-temperature and high-pressure gas; flows through the second condenser and exchanges heat with the heating working medium, the refrigerant releases heat and condenses into liquid, and the heating working medium absorbs heat and heats up to be used for external heating;

[0045] S2, dehumidification, air conditioning and cooling mode

[0046] When the concentrated solution and hydrate mixture in the solution storage tank is subjected to dehumidification and air conditioning, it absorbs water vapor in the air, its temperature rises and becomes a dilute solution with lower density, and then returns to the solution storage tank;

[0047] The mixture of dehumidification solution and ice in the lower part of the storage tank is pressurized by the second pump, and returns to the storage tank from the upper part after absorbing heat through the first air-conditioning terminal and the second air-conditioning terminal.

[0048] The beneficial effects of the present invention are mainly reflected in:

[0049] 1. The present invention uses water, aqueous solution, paraffin and other substances as low-temperature heat sources for heat pumps. Through direct contact between the heat pump working fluid and the low-temperature heat source, the sensible heat and latent heat of phase change of the working fluid are extracted to heat the house. After releasing the latent heat, the solidified medium stores potential energy and can be used for air conditioning and cooling of houses in summer. Compared with traditional heat pumps, the low-temperature end and high-temperature end of the heat pump are used simultaneously, with composite and dual functions, which significantly improves the energy efficiency of the heat pump system.

[0050] 2. The present invention adopts environmentally friendly working fluids such as carbon dioxide and propane in the heating season, which are in direct contact with the cold storage working fluid for heat exchange, and absorbs the solidification phase change heat of the cold storage working fluid for heating. The solidified cold storage working fluid is stored in a thermal insulation storage tank for use in summer air conditioning; the heat pump working fluid directly contacts the cold storage working fluid to absorb heat, which reduces the heat transfer temperature difference and further improves the energy efficiency of the heat pump; in the transition season, the system can use solar energy, industrial waste heat, etc. to heat the cold storage medium in the storage tank. In the heating season, the stored thermal energy is first used for heating, and then the heat pump is switched to ice making, heating and heating mode.

[0051] 3. Compared with other ice-making and heat-taking technologies, the present invention adopts working fluids such as carbon dioxide and propane, is environmentally friendly, and makes ice by direct contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0053] Figure 1 It is a schematic diagram of a single-medium phase-change cold storage heat pump system using carbon dioxide as a heat pump working fluid of the present invention;

[0054] Figure 2 A schematic diagram of a single-medium phase-change cold storage heat pump system for solar waste heat auxiliary heating of the present invention;

[0055] Figure 3 It is a schematic diagram of a single-medium phase-change cold storage heat pump system using an environmentally friendly working fluid according to the present invention;

[0056] Figure 4 It is a schematic diagram of a phase change cold storage heat pump system using a dehumidification solution as a cold storage working medium according to the present invention. DETAILED DESCRIPTION

[0057] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto:

[0058] Embodiment 1: A cross-seasonal energy storage heating system, a single-medium phase-change cold storage heat pump system using carbon dioxide as a heat pump working fluid, such as Figure 1 As shown. Considering that water, aqueous solution, paraffin and other substances have high phase change heat during phase changes such as solidification and melting, and the solidification and melting temperatures are mostly within the operating range of high heat pump operation efficiency, carbon dioxide has unique advantages as a heat pump working fluid. This embodiment uses carbon dioxide and water and other working fluids to directly contact each other for phase change heat transfer. On the one hand, heat is supplied by the heat pump in winter, and at the same time, the phase change of the working fluid is used for cold storage. On the other hand, the cold energy of the cold storage working fluid is released in summer to cool the house, so as to meet the needs of house buildings in winter and summer.

[0059] The single-medium phase-change cold storage heat pump system comprises a carbon dioxide heat pump circulation passage, a cold storage working medium circulation passage, a conventional heat pump circulation passage and an air conditioning circulation passage.

[0060] The carbon dioxide heat pump circulation path includes a first compressor 1, a cooler 2, an evaporative condenser 3 and a gas-liquid contactor 27. The first compressor 1 is connected to the inlet of the hot side channel of the cooler 2 through a pipeline, and the high-temperature and high-pressure carbon dioxide gas discharged from the compressor 1 is introduced into the hot side channel of the cooler 2. The cold side channel of the cooler 2 is connected to the heating circuit at the user end. In the cooler 2, the high-temperature and high-pressure carbon dioxide gas exchanges heat with the heating working medium in the heating circuit to heat the heating working medium for heating at the user end.

[0061] The gas-liquid contactor 27 is a sealed container tank with a gas outlet on the top, a heat pump working fluid inlet and a cold storage working fluid inlet on the upper part, the heat pump working fluid inlet is located lower than the cold storage working fluid inlet, a cold storage working fluid outlet is located at the bottom, and the interior is a place for heat exchange between carbon dioxide and the cold storage working fluid.

[0062] The hot side channel outlet of the cooler 2 is connected to the hot side channel inlet of the evaporative condenser 3 and the hot side channel inlet of the first condenser 4 through pipelines. The hot side channel outlet of the evaporative condenser 3 and the hot side channel outlet of the first condenser 4 are combined into one path and then connected to the heat pump working medium inlet of the gas-liquid contactor 27 through the first regulating valve 10 and the first expansion end 91 of the first energy recovery device 9. The gas outlet of the gas-liquid contactor 27 is connected to the first compressor 1 through the first gas-liquid separator 26, the first compression end 92 of the first energy recovery device 9, and the first switch valve 101. The first condenser 4 is an auxiliary condenser, and the cold side channel is connected to the external cooling water, which is used to heat domestic hot water or other purposes, or when the cooling or heating load is low, it is used as an auxiliary condenser to dissipate heat.

[0063] The cold storage medium circulation passage includes a storage tank 15, which is used for heat preservation and storage of the cold storage medium. The storage tank 15 can be a vertical cylindrical shape, welded with stainless steel and low-carbon galvanized plate, and its outer wall is covered with multiple layers of insulation materials for heat preservation. The storage tank 15 can also be a civil structure pool, the pool wall is waterproof and heat-insulated, and the outer surface of the pool is provided with a heat-insulating covering plate. Two cold storage medium inlets are located at the upper part of the storage tank 15, and two cold storage medium outlets are located at the lower part of the storage tank 15. The cold storage medium outlet at the bottom of the gas-liquid contactor 27 is connected to a cold storage medium inlet at the upper part of the storage tank 15 through a pipeline through the third regulating valve 14 and the second expansion end 131 of the second energy recovery device 13. A cold storage medium outlet of the storage tank 15 is connected to the sprayer 111 through a pipeline through the second compression end 132 of the second energy recovery device 13, and then through the first pump 12 and the second regulating valve 11. The sprayer 111 is located at the top of the inner cavity of the gas-liquid contactor 27, and is used to spray the cold storage medium downward, and exchange heat with the carbon dioxide liquid introduced into the circulation path of the carbon dioxide heat pump in the inner cavity of the gas-liquid contactor 27. The carbon dioxide liquid absorbs heat and evaporates into gas and rises, while the cold storage medium cools down, solidifies and falls.

[0064] The conventional heat pump circulation path includes a second condenser 6, the cold side channel of the second condenser 6 is used to pass the heating medium in the user-side heating circuit, and the refrigerant flows in the hot side channel (that is, the refrigerant flows in the conventional heat pump circulation path). The cold side channel outlet of the evaporative condenser 3 passes through the second gas-liquid separator 8, the second compressor 7, the hot side channel of the second condenser 6, the liquid storage tank 61, the drying filter 51 and the first throttle valve 5 in sequence, and is connected to the cold side channel inlet of the evaporative condenser 3. In the evaporative condenser 3, the carbon dioxide in the hot side channel exchanges heat with the refrigerant in the cold side channel, the carbon dioxide releases heat and condenses into liquid, and the refrigerant absorbs the heat released by the carbon dioxide and becomes a gas. In the second condenser 6, the high-temperature refrigerant discharged by the second compressor 7 releases heat to heat the heating medium from the user-side heating circuit, and then cools down and condenses into liquid.

[0065] The air conditioning circulation passage includes a first air conditioning terminal 24 and a second air conditioning terminal 25. The bottom outlet of the storage tank 15 is connected in sequence through the second switch valve 17, the second pump 16, the first air conditioning terminal 24, the second air conditioning terminal 25 and the inlet at the top of the storage tank 15.

[0066] The phase change cold storage method of this embodiment is specifically as follows:

[0067] 1. Heat pump ice making and heating mode

[0068] During heating, the heat pump working fluid (carbon dioxide) discharged from the first compressor 1 first exchanges heat with the heating working fluid from the user-side heating circuit in the cooler 2, so that the heating working fluid is heated and heated for external heating. The carbon dioxide cooled by heat exchange with the heating working fluid is then condensed into liquid after heat exchange with the refrigerant in the evaporative condenser 3, and then heat exchanged with the cold storage working fluid in the gas-liquid contactor 27. The carbon dioxide absorbs the heat of the cold storage working fluid and re-gasifies into gas. The cold storage working fluid is collected in the storage tank 15 for subsequent air conditioning refrigeration cycle. In this embodiment, carbon dioxide is used as the heat pump working fluid, which directly contacts water to absorb heat. Water solidifies and releases latent heat. Liquid carbon dioxide absorbs heat and vaporizes. The generated ice is stored in the storage tank 15 as a cold source for air conditioning in summer. Specifically:

[0069] 1.1. The first switch valve 101, the first regulating valve 10, the second regulating valve 11 and the third regulating valve 14 are opened, and the second switch valve 17 is closed, that is, the carbon dioxide heat pump circulation passage, the cold storage medium circulation passage and the conventional heat pump circulation passage are opened, and the air conditioning circulation passage is closed.

[0070] 1.2. Carbon dioxide circulation heat exchange

[0071] The first compressor 1 introduces high-temperature and high-pressure carbon dioxide gas into the hot side channel of the cooler 2, and the heating working fluid in the external user-end heating circuit enters the cold side channel of the cooler 2. The temperature of the high-temperature and high-pressure carbon dioxide gas decreases after heat exchange with the heating working fluid.

[0072] The carbon dioxide gas with reduced temperature coming out of the cooler 2 is further condensed and released through the evaporative condenser 3 and the first condenser 4 to become liquid carbon dioxide, and then enters the first expansion end 91 through the first regulating valve 10 to expand and reduce pressure, and then enters the gas-liquid contactor 27 after energy recovery; the cold storage medium sprayed from the sprayer 111 and the liquid carbon dioxide are fully contacted and heat exchanged in the inner cavity of the gas-liquid contactor 27, and the carbon dioxide liquid absorbs heat and vaporizes into gas, and enters the first compressor 1 from the gas outlet at the top of the gas-liquid contactor 27 through the first gas-liquid separator 26, the first compression end 92, and the first switch valve 101 to be compressed into high-temperature and high-pressure carbon dioxide gas, and then the high-temperature and high-pressure carbon dioxide gas enters the cooler 2 to realize the circulation of carbon dioxide.

[0073] 1.3. Circulation and heat exchange of cold storage medium

[0074] In the gas-liquid contactor 27, the cold storage medium sprayed and dropped from the sprayer 111 exchanges heat with the liquid carbon dioxide, is cooled, solidified, releases latent heat, and becomes a mixture of water and a small amount of ice. The mixture passes through the third regulating valve 14, and then expands and reduces pressure through the second expansion end 131, recovers energy, and then enters the storage tank 15 along the tangential direction at the upper part of the storage tank 15. Then, in the storage tank 15, the solid cold storage medium ice accumulates continuously at the upper part of the storage tank 15 due to its low density, and the liquid cold storage medium flows out from the lower part of the storage tank 15, is pressurized by the second compression end 132, and then enters the gas-liquid contactor 27 after passing through the first pump 12 and the second regulating valve 11, and is sprayed and dropped from the sprayer 111, thereby realizing the circulation of the cold storage medium.

[0075] When ice making and heat extraction begin, the cold storage medium inside the storage tank 15 is liquid water, or a mixture of water and a small amount of ice. During the ice making and heat extraction process, the cold storage medium in the storage tank 15 continues to solidify. After the ice making and heat extraction is completed, the cold storage medium is a mixture of ice and a small amount of water, which serves as a cold source for the subsequent air-conditioning cycle.

[0076] 1.4. Refrigerant circulation heat exchange

[0077] In the evaporative condenser 3, the carbon dioxide gas in the hot side channel exchanges heat with the refrigerant in the cold side channel, and the refrigerant absorbs the condensation heat of carbon dioxide and then evaporates and gasifies;

[0078] The vaporized refrigerant exits the cold side channel of the evaporative condenser 3, passes through the second gas-liquid separator 8, enters the second compressor 7, is compressed into a high-temperature and high-pressure gas, and then enters the hot side channel of the second condenser 6. After condensation and heat release, it condenses into liquid, while heating the heating medium of the cold side channel on the other side. Then, the refrigerant liquid enters the liquid storage tank 61 and passes through the drying filter 51. It is throttled and reduced in pressure by the first throttle valve 5 and enters the cold side channel of the evaporative condenser 3, thereby realizing the circulation heat exchange of the refrigerant.

[0079] 1.5 Heating

[0080] The heating medium heated in the second condenser 6 is used together with the heating medium heated in the cooler 2 for external heating.

[0081] 2. Air conditioning cooling mode

[0082] When the air conditioner needs to be turned on, the first switch valve 101, the first regulating valve 10, the second regulating valve 11, and the third regulating valve 14 are closed, and the second switch valve 17 is opened, that is, the carbon dioxide heat pump circulation path, the cold storage working medium circulation path and the conventional heat pump circulation path are closed, and the air conditioning circulation path is opened.

[0083] The liquid cold storage medium at the bottom of the storage tank 15 enters the air conditioning system after being pressurized by the second pump 16, and enters the storage tank 15 from the top after absorbing heat and releasing cold energy at the first air conditioning terminal 24 and the second air conditioning terminal 25.

[0084] The cold storage medium in the storage tank 15 is initially a mixture of ice and water, and the cold is released by melting the ice until all the ice melts into water and the water temperature rises to a temperature close to the room temperature of the air-conditioned room.

[0085] Embodiment 2: A cross-seasonal energy storage heating system, using a single-medium phase-change cold storage heat pump system with solar waste heat auxiliary heating, such as Figure 2 shown.

[0086] On the basis of Example 1, the storage tank 15 is connected to the external solar waste heat heater 218, and an auxiliary heating circulation path is added. Specifically, a group of cold storage medium inlets and outlets are added to the storage tank 15, and the cold storage medium outlet is connected to the cold storage medium inlet after passing through the fifth regulating valve 217, the third pump 216, the solar waste heat heater 218 and the fourth regulating valve 219, thereby forming an auxiliary heating circulation path for the cold storage medium. The solar waste heat heater 218 can use an evaporator or a condenser, and is connected to an external solar heating device or a waste heat heating device. In the solar waste heat heater 218, the cold storage medium exchanges heat with the auxiliary heating medium of the solar energy or waste heat heating.

[0087] The carbon dioxide heat pump circulation path, the cold storage medium circulation path, the conventional heat pump circulation path and the air conditioning circulation path are consistent with those in Example 1.

[0088] The phase change cold storage method of this embodiment is:

[0089] In the transition season, the auxiliary heating mode is operated, and the heat stored in the cold storage medium in the storage tank 15 is heated by an external heat source. In winter, the heat energy stored in the storage tank 15 is first used for heating. When the water temperature drops to a level that cannot meet the heating needs, the heat pump ice-making and heating mode is entered. In summer, the air conditioning cooling mode is operated.

[0090] 1. Auxiliary heating mode

[0091] In the transition season, the first switch valve 101, the first regulating valve 10, the second regulating valve 11, the third regulating valve 14 and the second switch valve 17 are closed, and the fifth regulating valve 217 and the fourth regulating valve 219 are opened, that is, the carbon dioxide heat pump circulation passage, the cold storage working medium circulation passage, the conventional heat pump circulation passage and the air conditioning circulation passage are closed, and the auxiliary heating circulation passage is opened.

[0092] The cold storage medium in the storage tank 15 flows through the solar waste heat heater 218 under the action of the third pump 216, exchanges heat with the auxiliary heating medium to increase the temperature, and then is transported back to the storage tank 15 to store heat.

[0093] 2. Air conditioning heating mode

[0094] The first switch valve 101, the first regulating valve 10, the second regulating valve 11, the third regulating valve 14, the fifth regulating valve 217 and the fourth regulating valve 219 are closed, and the second switch valve 17 is opened, that is, the carbon dioxide heat pump circulation passage, the cold storage working medium circulation passage, the conventional heat pump circulation passage and the auxiliary heating circulation passage are closed, and the air conditioning circulation passage is opened.

[0095] The cold storage medium in the storage tank 15 enters the air conditioning system after being pressurized by the second pump 16 , and enters the storage tank 15 from the top after releasing heat at the first air conditioning terminal 24 and the second air conditioning terminal 25 .

[0096] In the air conditioning heating mode and the auxiliary heating mode, the cold storage medium is liquid water.

[0097] 3. When the external heat source is insufficient to provide sufficient heat exchange energy and the temperature of the cold storage medium in the storage tank 15 drops below the set temperature value, the single medium phase change cold storage heat pump operation mode of embodiment 1 is switched. In the late heating period, the fifth regulating valve 217 and the fourth regulating valve 219 are closed to enter the heat pump ice making and heating mode.

[0098] 3.1. The heat pump ice making and heating mode is the same as step 1 of embodiment 1.

[0099] 3.2. The air conditioning cooling mode is the same as step 2 of embodiment 1.

[0100] Embodiment 3: A cross-seasonal energy storage heating system, using a single medium phase change cold storage heat pump system with an environmentally friendly working fluid, such as Figure 3 shown.

[0101] In order to avoid the high cost and other problems caused by the high pressure of carbon dioxide, environmentally friendly working fluids such as propane are used instead, which can simplify the system, such as Figure 3 As shown, on the basis of Example 1, the conventional heat pump circulation path is removed, including the environmental protection working medium circulation path, the cold storage working medium circulation path and the air conditioning circulation path, specifically:

[0102] The environmentally friendly working fluid circulation path includes a first compressor 1 and a third condenser 32. The hot side channel outlet of the third condenser 32 passes through a drying filter 51, a second throttle valve 28, a gas-liquid contactor 27, a first gas-liquid separator 26, a first switch valve 101 and the first compressor 1 in sequence and is connected to the hot side channel inlet of the third condenser 32. The cold side channel of the third condenser 32 is connected to the user-end heating circuit.

[0103] The cold storage medium circulation path and the air conditioning circulation path are consistent with those in Example 1.

[0104] The phase change cold storage method of this embodiment is specifically as follows:

[0105] 1. Heat pump ice making and heating mode

[0106] 1.1. The first switch valve 101, the second regulating valve 11, the second throttle valve 28 and the third regulating valve 14 are opened, and the second switch valve 17 is closed, that is, the environmental protection working medium circulation passage and the cold storage working medium circulation passage are opened, and the air conditioning circulation passage is closed.

[0107] 1.2. Environmentally friendly working fluid circulation heat exchange

[0108] The high-temperature and high-pressure environmentally friendly working fluid (propane gas) discharged from the first compressor 1 is condensed and released into liquid through the third condenser 32, and then throttled into the gas-liquid contactor 27 through the drying filter 51 and the second throttle valve 28, where it fully contacts with the cold storage working fluid to exchange heat and mass. The environmentally friendly working fluid absorbs heat and vaporizes into gas, then enters the first compressor 1 through the first separator 26 and the first switch valve 101 and is recompressed into high-temperature and high-pressure gas, and then enters the third condenser 32 again.

[0109] 1.3. Circulation and heat exchange of cold storage medium

[0110] In the gas-liquid contactor 27, the cold storage medium sprayed and falling from the sprayer 111 exchanges heat with the liquid environmental protection medium, is cooled, solidified, releases latent heat, and becomes a mixture of water and a small amount of ice. After passing through the third regulating valve 14, and then expanding and reducing pressure through the second expansion end 131, and recovering energy, it enters the storage tank 15 along the tangential direction at the upper part of the storage tank 15. Then, in the storage tank 15, the solid cold storage medium ice accumulates continuously at the upper part of the storage tank 15 due to its low density, and the liquid cold storage medium flows out from the lower part of the storage tank 15, is pressurized by the second compression end 132, and then enters the gas-liquid contactor 27 after passing through the first pump 12 and the second regulating valve 11, and sprays and falls from the sprayer 111, thereby realizing the circulation of the cold storage medium.

[0111] When ice making and heat extraction begin, the cold storage medium inside the storage tank 15 is liquid water, or a mixture of water and a small amount of ice. During the ice making and heat extraction process, the cold storage medium in the storage tank 15 continues to solidify. After the ice making and heat extraction is completed, the cold storage medium is a mixture of ice and a small amount of water, which serves as a cold source for the subsequent air-conditioning cycle.

[0112] 1.4 Heating

[0113] The heating medium heated in the third condenser 32 is used for external heating.

[0114] 2. Air conditioning cooling mode

[0115] When the air conditioner is turned on, the first switch valve 101, the second throttle valve 28, the second regulating valve 11, and the third regulating valve 14 are closed, and the second switch valve 17 is opened. The liquid cold storage medium in the lower part of the storage tank 15 enters the air conditioning system after being pressurized by the second pump 16, and enters the storage tank 15 from the top after absorbing heat and releasing cold at the first air-conditioning terminal 24 and the second air-conditioning terminal 25.

[0116] The cold storage medium in the storage tank 15 is initially a mixture of ice and water, and the cold is released by melting the ice until all the ice melts into water and the water temperature rises to a temperature close to the room temperature of the air-conditioned room.

[0117] Embodiment 4: A cross-seasonal energy storage heating system, a phase change cold storage heat pump system using a dehumidification solution as a cold storage medium, such as Figure 4 shown.

[0118] On the basis of Example 1, the carbon dioxide heat pump circulation path, the cold storage medium circulation path, the conventional heat pump circulation path and the air conditioning circulation path are retained, and the storage tank 15 is further increased with a dehumidification solution path and a dehumidification air conditioning circulation path, specifically:

[0119] A dehumidification solution outlet is added at the bottom of the storage tank 15, and a tee is added to the pipeline between the first pump 12 and the second regulating valve 11. The outlet of the tee is connected to the second regulating valve 11, one inlet is connected to the first pump 12, and the other inlet is connected to the dehumidification solution passage. The dehumidification solution passage includes a solution storage tank 151, which is a sealed tank body for storing dehumidification solutions such as lithium bromide. A solution inlet and a solution outlet are provided at the lower part of the tank body, and a solution inlet and a solution outlet are provided at the upper part of the tank body. The dehumidification solution outlet at the bottom of the storage tank 15 is connected to a solution inlet at the lower part of the solution storage tank 151 through the third switch valve 172 and the fourth pump 171 in sequence, and a solution outlet at the upper part of the solution storage tank 151 is connected to the fifth pump 163 and the fourth switch valve 164, and then connected to the second regulating valve 11 through the tee, so that the dehumidification solution passage is connected to the cold storage medium circulation passage.

[0120] The dehumidification and air conditioning circulation path includes a solution outlet at the lower portion of the solution storage tank 151 , which is connected to a solution inlet at the upper portion of the solution storage tank 151 after passing through the sixth pump 161 , the fifth switch valve 162 and the dehumidification and air conditioning 241 .

[0121] The cold storage medium circulation path and the conventional heat pump circulation path are the same as those in Example 1.

[0122] In this embodiment, the dehumidification solution can be a liquid dehumidifier solution such as calcium chloride and lithium bromide, which can reduce the freezing point and further improve the energy storage density; the dehumidification solution is in direct contact with the heat pump working fluid, and after cooling, an ice-water mixture and a salt hydrate are formed, and the hydrate is dissolved into a concentrated solution, which can be used for air dehumidification. The storage tank 15 mainly stores a mixture of ice and a dilute solution, and the solution storage tank 151 stores a high-concentration dehumidification solution.

[0123] The phase change cold storage method of this embodiment is:

[0124] 1. Heat pump ice making and heating mode

[0125] 1.1. The first switch valve 101, the first regulating valve 10, the second regulating valve 11, the third regulating valve 14, the third switch valve 172 and the fourth switch valve 164 are opened, and the fifth switch valve 162 and the second switch valve 17 are closed, that is, the carbon dioxide heat pump circulation passage, the cold storage working medium circulation passage, the conventional heat pump circulation passage, and the dehumidification solution passage are opened, and the air conditioning circulation passage and the dehumidification air conditioning passage are closed.

[0126] 1.2. Carbon dioxide circulation heat exchange

[0127] Except that in the gas-liquid contactor 27, the dehumidification solution is sprayed down from the sprayer 111, and the carbon dioxide contacts the dehumidification solution for heat exchange and is vaporized into gas after absorbing heat. The rest is the same as step 1.2 of Example 1.

[0128] 1.3. Dehumidification solution circulation heat exchange

[0129] (1) In the gas-liquid contactor 27, the dehumidification solution sprayed from the sprayer 111 is fully in contact with carbon dioxide. After the dehumidification solution releases heat and cools down, it becomes a mixture of ice, concentrated solution, and hydrated salt. The mixture passes through the third regulating valve 14 and the expansion end 131 of the energy recovery device 13, and then enters the storage tank 15 from the top. The concentrated solution and hydrate with higher density in the mixture gather at the bottom of the storage tank 15 and enter the dehumidification solution passage, and are sent to the solution storage tank 151 by the pump 171 through the valve 172. The dilute solution with lower density in the mixture is located at the lower part of the storage tank 15. After entering the gas-liquid contactor 27 through the second regulating valve 11, it is sprayed and falls from the sprayer 111 and continues to participate in the circulation of the cold storage working medium circulation passage. The solid ice in the mixture gradually accumulates at the upper part of the storage tank 15 because of its lightest density.

[0130] (2) In the solution storage tank 151, the higher density parts of the concentrated solution and hydrate are further gathered in the lower part of the solution storage tank 151, and the lower density parts are located in the upper part of the solution storage tank 151. After passing through the fifth pump 163 and the fourth switch valve 164, they enter the cold storage medium circulation path, enter the gas-liquid contactor 27 through the second regulating valve 11, and then fall from the sprayer 111 to continue to participate in the circulation of the cold storage medium circulation path.

[0131] When the heat pump ice making, heating and heating mode starts, the storage tank 15 and the solution storage tank 151 contain liquid dehumidification solution. After the heat pump ice making, heating and heating mode ends, the storage tank 15 contains a mixture of dehumidification solution and ice, and the solution storage tank 151 contains a mixture of concentrated solution and hydrate.

[0132] 1.4. The method of refrigerant circulation heat exchange is the same as step 1.4 of Example 1.

[0133] 1.5. Heating, which is the same as step 1.5 of Example 1.

[0134] 2. Dehumidification and cooling mode

[0135] 2.1. The first switch valve 101, the first regulating valve 10, the second regulating valve 11, the third regulating valve 14, the third switch valve 172 and the fourth switch valve 164 are closed, and the fifth switch valve 162 and the second switch valve 17 are opened, that is, the carbon dioxide heat pump circulation passage, the cold storage working medium circulation passage, the conventional heat pump circulation passage, and the dehumidification solution passage are closed, and the air conditioning circulation passage and the dehumidification air conditioning passage are opened.

[0136] 2.2. The concentrated solution and hydrate mixture in the lower part of the solution storage tank 151 are sent to the dehumidification air conditioner 241 through the sixth pump 161 and the fifth switch valve 162. After the air is processed and the water vapor in the air is absorbed in the dehumidification air conditioner 241, the temperature rises and becomes a dilute solution with lower density. The dilute solution returns to the upper part of the solution storage tank 151.

[0137] The mixture of dehumidification solution and ice in the lower part of the storage tank 15 enters the air conditioning system after being pressurized by the second pump 16, and returns to the storage tank 15 from the upper part after absorbing heat and releasing cold energy at the first air conditioning terminal 24 and the second air conditioning terminal 25.

[0138] The heat pump system designed in the present invention can release heat for heating at the high-temperature heat source end, and use the cold storage medium to release heat and store cold at the low-temperature heat source end. As a cold source for summer air conditioning, it has cross-seasonal cooling and heating characteristics. Compared with conventional heat pumps, it realizes the simultaneous utilization of the low-temperature and high-temperature ends of the heat pump, has composite and dual functions, and significantly improves the energy efficiency of the heat pump system.

[0139] In summary, the cross-seasonal energy storage and heating system of the present invention uses environmentally friendly working fluids such as carbon dioxide and propane as heat pump working fluids in the heating season. The heat pump working fluid directly contacts and exchanges heat with the cold storage working fluid, absorbs the solidification phase change heat of the cold storage working fluid for heating, and the solidified cold storage working fluid is stored in a heat-insulating storage tank for summer air conditioning. The heat pump working fluid directly contacts and absorbs heat with the cold storage working fluid, which reduces the heat transfer temperature difference and further improves the energy efficiency of the heat pump.

[0140] In the transition season, the system can use solar energy, industrial waste heat, etc. to heat the cold storage medium in the storage tank. In the heating season, the stored heat energy is first used for heating, and then the heat pump is switched to ice making and heating mode.

[0141] Dehumidification solution is used as the cold storage working fluid. The solution can be concentrated during heating operation to obtain a concentrated solution for summer air conditioning dehumidification, further improving the system's cold storage capacity.

[0142] Finally, it should be noted that the above examples are only some specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A cross-season energy storage heating system, characterized by: It includes an environmental protection working medium circulation path and a cold storage working medium circulation path; The environmentally friendly working medium circulation path comprises: a first compressor (1) connected in sequence through a third condenser (32), a drying filter (51), a second throttle valve (28), a gas-liquid contactor (27), a first gas-liquid separator (26), a first switch valve (101) and the first compressor (1); The cold storage medium circulation path comprises: a gas-liquid contactor (27) connected in sequence to a sprayer (111) via a third regulating valve (14), a second expansion end (131), a storage tank (15), a second compression end (132), a first pump (12), and a second regulating valve (11).

2. A cross-season energy storage heating system, characterized by: It includes a carbon dioxide heat pump circulation path, a cold storage medium circulation path and a conventional heat pump circulation path; The carbon dioxide heat pump circulation path comprises: a first compressor (1) is divided into two paths after passing through a cooler (2), respectively passing through an evaporative condenser (3) and a first condenser (4) and then merged into one path, and then connected to the first compressor (1) through a first regulating valve (10), a first expansion end (91), a gas-liquid contactor (27), a first gas-liquid separator (26), a first compression end (92), and a first switch valve (101); The cold storage medium circulation path comprises: a gas-liquid contactor (27) connected to a sprayer (111) in sequence through a third regulating valve (14), a second expansion end (131), a storage tank (15), a second compression end (132), a first pump (12), and a second regulating valve (11); The conventional heat pump circulation path comprises: an evaporative condenser (3) sequentially passing through a second gas-liquid separator (8), a second compressor (7), a second condenser (6), a liquid storage tank (61), a drying filter (51), and a first throttle valve (5) before being connected to the evaporative condenser (3).

3. The inter-seasonal energy storage heating system according to claim 2 is characterized in that: The storage tank (15) is connected to an auxiliary heating circulation passage: the storage tank (15) is connected to the storage tank (15) after passing through a fifth regulating valve (217), a third pump (216), a solar waste heat heater (218) and a fourth regulating valve (219) in sequence.

4. The inter-seasonal energy storage heating system according to claim 2 is characterized in that: The storage tank (15) is connected to the dehumidification solution passage: the storage tank (15) passes through the third switch valve (172), the fourth pump (171), the solution storage tank (151), the fifth pump (163), and the fourth switch valve (164) in sequence, and is then connected to the pipeline between the first pump (12) and the second regulating valve (11), and flows into the cold storage medium circulation passage; The solution storage tank (151) is also connected to the dehumidification air conditioning circulation path: the solution storage tank (151) is connected to the solution storage tank (151) after passing through the sixth pump (161), the fifth switch valve (162) and the dehumidification air conditioning (241).

5. A cross-seasonal energy storage heating system according to any one of claims 1 to 4, characterized in that: The storage tank (15) is connected to an air conditioning circulation passage: the storage tank (15) is connected in sequence through a second switch valve (17), a second pump (16), a first air conditioning terminal (24), a second air conditioning terminal (25) and the storage tank (15); The cooler (2) and the second condenser (6) are both connected to a heating circuit on the user side; The sprayer (111) is located at the top of the inner cavity of the gas-liquid contactor (27).

6. A phase change cold storage method for a cross-seasonal energy storage heating system according to any one of claims 1 or 5, characterized in that: S1, heat pump ice making and heating mode The environmentally friendly working fluid flows along the environmentally friendly working fluid circulation passage, exchanges heat with the heating working fluid when flowing through the third condenser (32), the environmentally friendly working fluid releases heat and condenses into liquid, and the heating working fluid absorbs heat and heats up for external heating; when the environmentally friendly working fluid flows through the gas-liquid contactor (27), it exchanges heat with the cold storage working fluid in the cold storage working fluid circulation passage, and the environmentally friendly working fluid absorbs heat and vaporizes; when flowing through the first compressor (1), the environmentally friendly working fluid is compressed into high-temperature and high-pressure gas; The cold storage medium flows along the cold storage medium circulation passage, flows through the gas-liquid contactor (27), and is sprayed down from the sprayer (111), exchanging heat with the environmentally friendly medium in the environmentally friendly medium circulation passage. The cold storage medium is cooled and solidified into a liquid-solid mixture. Solid matter in the cold storage medium is continuously accumulated on the upper part of the storage tank (15), and liquid cold storage medium flows out from the lower part of the storage tank (15). S2, air conditioning cycle mode The liquid cold storage medium in the lower part of the storage tank (15) is pressurized by the second pump (16), and then returns to the storage tank (15) from the upper part after absorbing heat through the first air conditioning terminal (24) and the second air conditioning terminal (25).

7. A phase change cold storage method for a cross-seasonal energy storage heating system according to any one of claims 3 or 5, characterized in that: S1, heat pump ice making and heating mode The carbon dioxide flows along the carbon dioxide heat pump circulation path, exchanges heat with the heating medium when flowing through the cooler (2), the carbon dioxide releases heat and condenses into liquid, and the heating medium absorbs heat and heats up for external heating; the carbon dioxide releases heat and condenses into liquid when flowing through the evaporative condenser (3) and the first condenser (4), exchanges heat with the cold storage medium in the cold storage medium circulation path when flowing through the gas-liquid contactor (27), and absorbs heat and gasifies; and is compressed into high-temperature and high-pressure gas when flowing through the first compressor (1); The cold storage medium flows along the cold storage medium circulation passage, flows through the gas-liquid contactor (27), and is sprayed and dropped from the sprayer (111), where it exchanges heat with the carbon dioxide in the carbon dioxide heat pump circulation passage. The cold storage medium is cooled and solidified into a liquid and solid mixture. The solid cold storage medium is continuously accumulated on the upper part of the storage tank (15), and the liquid cold storage medium flows out from the lower part of the storage tank (15). The refrigerant flows along the conventional heat pump circulation path, exchanges heat with the carbon dioxide in the carbon dioxide heat pump circulation path when flowing through the evaporative condenser (3), absorbs heat and then heats up and vaporizes; flows through the second compressor (7) and is compressed into high-temperature and high-pressure gas; flows through the second condenser (6) and exchanges heat with the heating medium, the refrigerant releases heat and condenses into liquid, and the heating medium absorbs heat and heats up and is used for external heating; S2, air conditioning cycle mode The liquid cold storage medium in the lower part of the storage tank (15) is pressurized by the second pump (16), and then returns to the storage tank (15) from the upper part after absorbing heat through the first air conditioning terminal (24) and the second air conditioning terminal (25).

8. The phase change cold storage method of the cross-seasonal energy storage heating system according to claim 7 is characterized in that: The auxiliary heating mode is operated in the transition season. In winter, the air conditioning heating mode is operated first, and then the heat pump ice making and heating mode is operated; in summer, the air conditioning cooling mode is operated; The auxiliary heating mode mainly comprises: the cold storage medium in the storage tank (15) flows along the auxiliary heating circulation path, flows through the solar waste heat heater (218), exchanges heat with the external auxiliary heating medium to increase the temperature, and then returns to the storage tank (15) to store heat; The air conditioning heating mode is mainly as follows: the cold storage medium in the storage tank (15) enters the air conditioning system after being pressurized by the second pump (16), and returns to the storage tank (15) from the top after releasing heat at the first air conditioning terminal (24) and the second air conditioning terminal (25).

9. A phase change cold storage method for a cross-seasonal energy storage heating system according to any one of claims 4-5, characterized in that: S1, heat pump ice making and heating mode The carbon dioxide flows along the carbon dioxide heat pump circulation path, exchanges heat with the heating medium when flowing through the cooler (2), the carbon dioxide releases heat and condenses into liquid, and the heating medium absorbs heat and heats up for external heating; the carbon dioxide releases heat and condenses into liquid when flowing through the evaporative condenser (3) and the first condenser (4), and exchanges heat with the dehumidification solution in the cold storage medium circulation path when flowing through the gas-liquid contactor (27), and the carbon dioxide absorbs heat and gasifies; When the carbon dioxide flows through the first compressor (1), it is compressed into a high-temperature and high-pressure gas; The dehumidification solution flows along the cold storage medium circulation passage and the dehumidification solution passage, flows through the gas-liquid contactor (27), and is sprayed and dropped from the sprayer (111), exchanging heat with the carbon dioxide in the carbon dioxide heat pump circulation passage. The dehumidification solution releases heat and cools down to become a mixture of ice, concentrated solution, and hydrated salt. The concentrated solution and hydrate with higher density in the mixture gather at the bottom of the storage tank (15) and enter the dehumidification solution passage. The dilute solution with lower density in the mixture flows out from the lower part of the storage tank (15) and continues to participate in the circulation of the cold storage medium circulation passage. The solid ice in the mixture gradually accumulates at the upper part of the storage tank (15). In the solution storage tank (151), the high-density part further gathers at the lower part of the solution storage tank (151), and the low-density part flows out from the upper part of the solution storage tank (151) and merges into the cold storage medium circulation passage. The refrigerant flows along the conventional heat pump circulation path, exchanges heat with the carbon dioxide in the carbon dioxide heat pump circulation path when flowing through the evaporative condenser (3), absorbs heat and then heats up and vaporizes; flows through the second compressor (7) and is compressed into high-temperature and high-pressure gas; flows through the second condenser (6) and exchanges heat with the heating medium, the refrigerant releases heat and condenses into liquid, and the heating medium absorbs heat and heats up and is used for external heating; S2, dehumidification, air conditioning and cooling mode When the concentrated solution and the hydrate mixture in the solution storage tank (151) pass through the dehumidification air conditioner (241), the temperature of the concentrated solution and the hydrate mixture increases after absorbing water vapor in the air and becomes a dilute solution with a lower density, and then returns to the solution storage tank (151); The mixture of dehumidifying solution and ice in the lower part of the storage tank (15) is pressurized by the second pump (16), and returns to the storage tank (15) from the upper part after absorbing heat at the first air-conditioning terminal (24) and the second air-conditioning terminal (25).

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