Thermal energy storage system

Abstract

The present application discloses a thermal energy storage system, comprising a compressor, a condenser, an evaporator, a heat-recovery heat exchanger, a domestic water tank, and a first reversing valve. The compressor is used for outputting a coolant. The heat-recovery heat exchanger is used for realizing heat exchange between the coolant and water, and comprises a coolant inlet, a coolant outlet, a water inlet and a water outlet, and the coolant inlet is connected to the outlet of the compressor. The domestic water tank is connected to the water inlet and the water outlet respectively, to form a water loop for thermal energy storage. The first reversing valve comprises a first valve port, a second valve port and a third valve port, the first valve port is connected to the coolant outlet, the second valve port is connected to the condenser, and the third valve port is connected to the evaporator. The water loop for thermal energy storage is used for storing at least part of heat of the coolant in the domestic water tank when the compressor is running. According to the present application, preparation of hot water while cooling or heating and preparation of hot water only can be achieved, thereby realizing full utilization of heat, and improving the flexibility, energy efficiency and stability of the system in different modes.

Description

Thermal energy storage system Technical Field

[0001] The present application relates to the field of heat pump technology, and in particular to a thermal energy storage system. Background Art

[0002] With the continuous advancement of technology, people's requirements for living environments are becoming increasingly higher. Air-source heat pumps, which can partially solve the energy crisis, are becoming increasingly popular among manufacturers and users. However, the domestic hot water module of existing trigeneration air-source heat pump systems uses a bypass line and two solenoid valves to achieve heat recovery. This lacks flexibility, and the increased number of pipes and valves affects system balance. Furthermore, the system is complex, resulting in instability and poor reliability in various aspects. Summary of the Invention

[0003] The technical problem to be solved by the present application is to provide a thermal energy storage system in response to at least one defect of the related technology mentioned in the above background technology: the combination flexibility of the two solenoid valves in heat recovery is poor.

[0004] The technical solution adopted by this application to solve the technical problem is to construct a thermal energy storage system, including:

[0005] Compressor, used to output refrigerant;

[0006] condensers and evaporators;

[0007] a heat recovery heat exchanger for achieving heat exchange between the refrigerant and water, the heat recovery heat exchanger comprising a refrigerant inlet, a refrigerant outlet, a water inlet, and a water outlet, wherein the refrigerant inlet is connected to the outlet of the compressor;

[0008] a domestic water tank, the domestic water tank being connected to the water inlet and the water outlet respectively to form a water circuit for thermal energy storage;

[0009] a first reversing valve, the first reversing valve comprising a first valve port, a second valve port, and a third valve port, the first valve port being connected to the refrigerant outlet, the second valve port being connected to the condenser, and the third valve port being connected to the evaporator;

[0010] The water circuit for heat energy storage is used to store at least part of the heat of the refrigerant in the domestic water tank when the compressor is running.

[0011] In one embodiment, the thermal energy storage system further comprises:

[0012] The second reversing valve includes a fourth valve port, a fifth valve port and a sixth valve port, the fourth valve port is connected to the outlet of the compressor, the fifth valve port is connected to the refrigerant inlet, and the sixth valve port is connected to the condenser.

[0013] In one embodiment, the thermal energy storage system further comprises:

[0014] The third reversing valve includes a seventh valve port, an eighth valve port, a ninth valve port and a tenth valve port, the seventh valve port being connected to the outlet of the compressor and the second valve port respectively, and; the eighth valve port being connected to the condenser or the evaporator, the ninth valve port being connected to the evaporator or the condenser, and the tenth valve port being connected to the inlet of the compressor.

[0015] In one embodiment, the first reversing valve and the second reversing valve are three-way valves, and the third reversing valve is a four-way valve.

[0016] In one embodiment, the thermal energy storage system further comprises:

[0017] An enthalpy increasing module, wherein a first end of the enthalpy increasing module is connected to the condenser, and a second end of the enthalpy increasing module is connected to the evaporator.

[0018] In one embodiment, the enthalpy increase module includes an economizer, an auxiliary refrigerant flow regulating device and a main refrigerant flow regulating device, and the economizer includes a main refrigerant inlet, an auxiliary refrigerant inlet, a main refrigerant outlet and an auxiliary refrigerant outlet;

[0019] Among them, the first end of the enthalpy increase module is divided into two paths, one path is connected to the evaporator after passing through the refrigerant main inlet, the refrigerant main outlet and the main refrigerant flow regulating device in sequence, and the other path is connected to the enthalpy increase port of the compressor after passing through the auxiliary refrigerant flow regulating device, the auxiliary refrigerant inlet and the auxiliary refrigerant outlet in sequence.

[0020] In one embodiment, the thermal energy storage system further comprises:

[0021] The pressure relief module includes a one-way valve, the inlet end of the one-way valve is connected to the main refrigerant flow regulating device, and the outlet end of the one-way valve is connected to the seventh valve port.

[0022] In one embodiment, the thermal energy storage system further comprises:

[0023] A liquid storage container, wherein the output end of the liquid storage container is connected to the first end of the enthalpy increasing module, and the input end of the liquid storage container is respectively connected to the main refrigerant flow regulating device and the third valve port.

[0024] In one embodiment, the first valve port is in communication with the second valve port or the first valve port is in communication with the third valve port;

[0025] When the first valve port is in communication with the second valve port, the refrigerant flows out of the compressor, passes through the refrigerant inlet, the refrigerant outlet, the first valve port, the second valve port, and the condenser to form a cooling refrigerant circuit or a heating refrigerant circuit, and at the same time, at least part of the heat of the refrigerant is stored in the domestic water tank through the water circuit for heat energy storage;

[0026] When the first valve port is connected to the third valve port, the refrigerant flows out of the compressor and passes through the refrigerant inlet, the refrigerant outlet, the first valve port, the third valve port and the evaporator to form a refrigerant circuit of pure hot water.

[0027] In one embodiment, in the cooling refrigerant circuit, the condenser is an outdoor heat exchanger, and the evaporator is an air-conditioning side heat exchanger; in the heating refrigerant circuit, the condenser is an air-conditioning side heat exchanger, and the evaporator is an outdoor heat exchanger; in the pure hot water refrigerant circuit, the evaporator is an outdoor heat exchanger.

[0028] By implementing this application, the following beneficial effects are achieved:

[0029] The present application arranges the heat recovery heat exchanger, the domestic water tank and the first reversing valve between the outlet of the compressor and the condenser, so that the high-temperature and high-pressure refrigerant output from the compressor flows into the heat recovery heat exchanger, thereby preparing hot water while cooling, preparing hot water while heating, and purely preparing hot water, thereby achieving full utilization of heat and improving the flexibility, energy efficiency and stability of the system in different modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present application will be further described below with reference to the accompanying drawings and embodiments, in which:

[0031] FIG1 is a schematic diagram of a thermal energy storage system of the present application;

[0032] FIG2 is a schematic diagram of the flow direction of the first refrigerant in the thermal energy storage system of the present application for preparing hot water in cooling mode;

[0033] FIG3 is a schematic diagram of the flow direction of the second refrigerant in the thermal energy storage system of the present application for preparing hot water in cooling mode;

[0034] FIG4 is a schematic diagram of the flow direction of the first refrigerant in the thermal energy storage system of the present application for preparing hot water in heating mode;

[0035] FIG5 is a schematic diagram of the flow direction of the second refrigerant in the thermal energy storage system of the present application for preparing hot water in heating mode;

[0036] FIG6 is a schematic diagram of the refrigerant flow direction of the thermal energy storage system of the present application in pure hot water mode;

[0037] FIG7 is a schematic diagram of the refrigerant flow direction of the thermal energy storage system of the present application in cooling mode;

[0038] FIG8 is a schematic diagram of the refrigerant flow direction of the thermal energy storage system of the present application in the heating mode. DETAILED DESCRIPTION

[0039] In order to have a clearer understanding of the technical features, purposes and effects of this application, the specific implementation methods of this application are now described in detail with reference to the accompanying drawings.

[0040] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0041] In the description of the application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "located at," and "located at" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or chemical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0043] As shown in Figure 1, one embodiment of the present application discloses a thermal energy storage system, including a compressor 11, a heat recovery heat exchanger 12, a domestic water tank 13, a first reversing valve 14, a condenser, and an evaporator. In cooling mode, the condenser is the outdoor heat exchanger 17, and the evaporator is the air conditioning side heat exchanger 21; in heating mode, the condenser is the air conditioning side heat exchanger 21, and the evaporator is the outdoor heat exchanger 17; or in pure hot water mode, the evaporator is the outdoor heat exchanger 17, as follows:

[0044] The compressor 11 is used to output refrigerant. The heat recovery heat exchanger 12 is used to realize heat exchange between refrigerant and water. The heat recovery heat exchanger 12 includes a refrigerant inlet 121, a refrigerant outlet 122, a water inlet 123 and a water outlet 124. The refrigerant inlet 121 is connected to the outlet of the compressor 11. The domestic water tank 13 is respectively connected to the water inlet 123 and the water outlet 124 to form a water circuit for heat energy storage. The first reversing valve 14 includes a first valve port 141, a second valve port 142 and a third valve port 143. The first valve port 141 is connected to the refrigerant outlet 122, the second valve port 142 is connected to the condenser, and the third valve port 143 is connected to the evaporator. For example, the first reversing valve 14 is a three-way valve, which is not limited here.

[0045] In which, the water circuit for heat energy storage is used to store at least part of the heat of the refrigerant in the domestic water tank 13 when the compressor 11 is running (i.e., in cooling mode, heating mode, or pure hot water mode), that is, at least part of the heat of the refrigerant output by the compressor 11 is heat-exchanged with the water in the domestic water tank 13 in the heat recovery heat exchanger 12 to prepare hot water.

[0046] In this embodiment, the thermal energy storage system further includes a second reversing valve 15, which includes a fourth valve port 151, a fifth valve port 152, and a sixth valve port 153. The fourth valve port 151 is connected to the outlet of the compressor 11, the fifth valve port 152 is connected to the refrigerant inlet 121, and the sixth valve port 153 is connected to the condenser. For example, the second reversing valve 15 is a three-way valve, which is not limited here.

[0047] The thermal energy storage system further includes a third reversing valve 16, which includes a seventh valve port 161, an eighth valve port 162, a ninth valve port 163, and a tenth valve port 164. The seventh valve port 161 is connected to the outlet of the compressor 11 and the second valve port 142, respectively. The eighth valve port 162 is connected to the condenser. The ninth valve port 163 is connected to the evaporator. The tenth valve port 164 is connected to the inlet of the compressor 11. Preferably, the tenth valve port 164 is connected to the inlet of the compressor 11 via a gas-liquid separator 25. Alternatively, the eighth valve port 162 is connected to the evaporator, and the ninth valve port 163 is connected to the condenser. For example, the third reversing valve 16 is a four-way valve, which is not limited here.

[0048] The thermal energy storage system further includes an enthalpy-increasing module, wherein a first end of the enthalpy-increasing module is connected to the condenser, and a second end of the enthalpy-increasing module is connected to the evaporator. The enthalpy-increasing module includes a main refrigerant circuit and a secondary enthalpy-increasing circuit, and the first and second ends of the enthalpy-increasing module serve as the first and second ends of the main refrigerant circuit.

[0049] Specifically, the enthalpy increase module includes an economizer 18 , an auxiliary refrigerant flow regulating device 19 and a main refrigerant flow regulating device 20 . The economizer 18 includes a main refrigerant inlet 181 , an auxiliary refrigerant inlet 182 , a main refrigerant outlet 183 and an auxiliary refrigerant outlet 184 .

[0050] Among them, the first end of the enthalpy increase module is divided into two paths, one path is connected to the evaporator after passing through the refrigerant main inlet 181, the refrigerant main outlet 183 and the main refrigerant flow regulating device 20 in sequence (that is, after passing through the refrigerant main path), and the other path is connected to the enthalpy increase port 111 of the compressor 11 after passing through the auxiliary refrigerant flow regulating device 19, the refrigerant auxiliary inlet 182 and the refrigerant auxiliary outlet 184 in sequence (that is, after passing through the enthalpy increase auxiliary path).

[0051] By adding the economizer 18 and the auxiliary refrigerant flow regulating device 19 at the outlet of the condenser, the refrigerant coming out of the condenser passes through the refrigerant main circuit and the enthalpy increase auxiliary circuit respectively. After the refrigerant in the enthalpy increase auxiliary circuit is throttled and cooled by the auxiliary refrigerant flow regulating device 19, the refrigerant heat from the refrigerant main circuit can be more efficiently absorbed in the economizer 18. After absorbing heat, the refrigerant vaporizes and enters the enthalpy increase port 111 of the compressor 11, thereby further reducing the temperature of the refrigerant in the refrigerant main circuit and improving the refrigeration effect of the terminal 22.

[0052] It is understandable that in other embodiments, if the length and complexity of the pipeline do not need to be considered, the compressor 11 may not be provided with the enthalpy increase port 111, but the refrigerant in the enthalpy increase auxiliary circuit can be directly introduced into the gas-liquid separator 25 and enter the compressor 11.

[0053] Specifically, after the temperature of the refrigerant in the main refrigerant circuit is reduced through heat exchange, the temperature is further reduced through the main refrigerant flow regulating device 20 before entering the evaporator, thereby improving the heat absorption performance of the refrigerant, that is, improving the cooling effect of the system.

[0054] To prevent excessive pipeline pressure, the thermal energy storage system further includes a pressure relief module 23, which includes a one-way valve. The inlet of the one-way valve is connected to the main refrigerant flow regulating device 20, and the outlet of the one-way valve is connected to the seventh valve port 161. In some embodiments, the inlet of the one-way valve is also connected to the outlet of the outdoor heat exchanger 17.

[0055] The thermal energy storage system also includes a liquid storage container 24. The output end of the liquid storage container 24 is connected to the first end of the enthalpy increase module. Specifically, one output end of the liquid storage container 24 is connected to the auxiliary refrigerant flow control device 19, and the other output end is connected to the main refrigerant inlet 181. The input end of the liquid storage container 24 is respectively connected to the main refrigerant flow control device 20 and the third valve port 143. In some embodiments, the input end of the liquid storage container 24 is also connected to the outlet end of the air-conditioning-side heat exchanger 21.

[0056] In this embodiment, the first valve port 141 is connected to the second valve port 142 or the first valve port 141 is connected to the third valve port 143. When the first valve port 141 and the second valve port 142 are connected, the refrigerant exits the compressor 11 and passes through the refrigerant inlet 121, the refrigerant outlet 122, the first valve port 141, the second valve port 142, and the condenser to form a cooling refrigerant circuit or a heating refrigerant circuit. Simultaneously, at least a portion of the heat of the refrigerant is stored in the domestic water tank 13 through the heat energy storage water circuit. Furthermore, in the cooling refrigerant circuit, the condenser is the outdoor heat exchanger 17, and the evaporator is the air conditioning heat exchanger 21. In the heating refrigerant circuit, the condenser is the air conditioning heat exchanger 21, and the evaporator is the outdoor heat exchanger 17.

[0057] When the first valve port 141 and the third valve port 143 are in communication, the refrigerant exiting the compressor 11 passes through the refrigerant inlet 121, the refrigerant outlet 122, the first valve port 141, the third valve port 143, and the evaporator to form a pure hot water refrigerant circuit. Furthermore, in the pure hot water refrigerant circuit, the evaporator is the outdoor heat exchanger 17.

[0058] In different situations, different valve ports will be connected, as follows:

[0059] As shown in FIG2 , in cooling mode, the fourth valve port 151 is connected to the fifth valve port 152, the first valve port 141 is connected to the second valve port 142, the seventh valve port 161 is connected to the eighth valve port 162, and the ninth valve port 163 is connected to the tenth valve port 164. That is, when hot water needs to be prepared in cooling mode, the high-temperature gas output from the outlet of the compressor 11 first passes through the fourth valve port 151 and the fifth valve port 152 of the second reversing valve 15 before entering the refrigerant inlet 121 of the heat recovery heat exchanger 12. The high-temperature gas exchanges heat with the water in the domestic water tank 13 in the heat recovery heat exchanger 12, and becomes medium-temperature gas after preparing hot water. The medium-temperature gas output from the refrigerant outlet 122 of the heat recovery heat exchanger 12 passes through the first valve port 141 and the second valve port 142 of the first reversing valve 14 and the seventh valve port 163 of the third reversing valve 16. 1 and the eighth valve port 162, then enters the first refrigerant interface 171 of the outdoor heat exchanger 17, and the medium-temperature gas condenses and releases heat in the outdoor heat exchanger 17 to become a medium-temperature liquid. The medium-temperature liquid output from the second refrigerant interface 172 of the outdoor heat exchanger 17 passes through the refrigerant main circuit and the enthalpy-increasing auxiliary circuit respectively. The medium-temperature liquid in the enthalpy-increasing auxiliary circuit is throttled and cooled by the auxiliary refrigerant flow regulating device 19 to become a low-temperature liquid. The low-temperature liquid absorbs the refrigerant heat from the refrigerant main circuit in the economizer 18 and becomes a relatively low-temperature gas, and finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid in the main refrigerant circuit is turned into a low-temperature liquid after its temperature is reduced by heat exchange, and is further throttled and cooled by the main refrigerant flow regulating device 20 to become a low-temperature liquid with a lower temperature, and then enters the third refrigerant interface 211 of the air-conditioning side heat exchanger 21. The low-temperature liquid exchanges heat with the circulating water in the terminal 22 in the air-conditioning side heat exchanger 21, and the low-temperature liquid absorbs the heat of the circulating water and evaporates to become a low-temperature gas. The low-temperature gas output from the fourth refrigerant interface 212 of the air-conditioning side heat exchanger 21 passes through the ninth valve port 163 and the tenth valve port 164 of the third reversing valve 16 and then returns to the inlet of the compressor 11, and circulates back and forth. The heat recovery heat exchanger 12 is connected to the domestic water tank 13, so that at least part of the condensation heat originally used for heat exchange with the air in the outdoor heat exchanger 17 can be recovered and utilized during summer cooling, avoiding the waste of all heat in the heat exchange between the outdoor heat exchanger 17 and the air. The recovered heat is exchanged with the water in the domestic water tank 13 in the heat recovery heat exchanger 12 to prepare hot water, thereby improving energy utilization.

[0060] As shown in Figure 3, in the cooling mode, the fourth valve port 151 is connected to the fifth valve port 152 and the sixth valve port 153 respectively, the first valve port 141 is connected to the second valve port 142, the seventh valve port 161 is connected to the eighth valve port 162, and the ninth valve port 163 is connected to the tenth valve port 164. That is, when hot water needs to be prepared in the cooling mode, the high-temperature gas output from the outlet of the compressor 11 passes through the fourth valve port 151 and the fifth valve port 152 of the second reversing valve 15 on one path and enters the refrigerant inlet 121 of the heat recovery heat exchanger 12, and passes through the fourth valve port 151 and the sixth valve port 153 of the second reversing valve 15 and the seventh valve port 161 and the eighth valve port 162 of the third reversing valve 16 on the other path and enters the first refrigerant interface 171 of the outdoor heat exchanger 17. The high-temperature gas exchanges heat with the water in the domestic water tank 13 in the heat recovery heat exchanger 12 and becomes medium-temperature gas after preparing hot water. The medium-temperature gas output from the refrigerant outlet 122 of the heat recovery heat exchanger 12 passes through the The first valve port 141 and the second valve port 142 of the first reversing valve 14 and the seventh valve port 161 and the eighth valve port 162 of the third reversing valve 16 then enter the first refrigerant interface 171 of the outdoor heat exchanger 17. The medium-temperature gas condenses and releases heat in the outdoor heat exchanger 17 and becomes a medium-temperature liquid. The medium-temperature liquid output from the second refrigerant interface 172 of the outdoor heat exchanger 17 passes through the refrigerant main path and the enthalpy increase auxiliary path respectively. The medium-temperature liquid in the enthalpy increase auxiliary path is throttled and cooled by the auxiliary refrigerant flow regulating device 19 to become a low-temperature liquid. The low-temperature liquid absorbs the refrigerant heat from the refrigerant main path in the economizer 18 and becomes a relatively low-temperature gas, and finally enters the enthalpy increase port 111 of the compressor 11. The medium-temperature liquid in the main refrigerant circuit is turned into a low-temperature liquid after its temperature is reduced by heat exchange, and is further throttled and cooled by the main refrigerant flow regulating device 20 to become a low-temperature liquid with a lower temperature, and then enters the third refrigerant interface 211 of the air-conditioning side heat exchanger 21. The low-temperature liquid exchanges heat with the circulating water in the terminal 22 in the air-conditioning side heat exchanger 21, and the low-temperature liquid absorbs the heat of the circulating water and evaporates to become a low-temperature gas. The low-temperature gas output from the fourth refrigerant interface 212 of the air-conditioning side heat exchanger 21 passes through the ninth valve port 163 and the tenth valve port 164 of the third reversing valve 16 and then returns to the inlet of the compressor 11, and circulates back and forth. The heat recovery heat exchanger 12 is connected to the domestic water tank 13, so that at least part of the condensation heat originally used for heat exchange with the air in the outdoor heat exchanger 17 can be recovered and utilized during summer cooling, avoiding the waste of all heat in the heat exchange between the outdoor heat exchanger 17 and the air. The recovered heat is exchanged with the water in the domestic water tank 13 in the heat recovery heat exchanger 12 to prepare hot water, thereby improving energy utilization.

[0061] Specifically, the difference between the embodiments shown in Figures 2 and 3 is that in the embodiment shown in Figure 3, an additional refrigerant path passes through the fourth valve port 151 and the sixth valve port 153 of the second reversing valve 15 and the seventh valve port 161 and the eighth valve port 162 of the third reversing valve 16 and enters the outdoor heat exchanger 17, which can better regulate the amount of refrigerant entering the heat recovery heat exchanger 12.

[0062] As shown in FIG4 , in the heating mode, the fourth valve port 151 is connected to the fifth valve port 152, the first valve port 141 is connected to the second valve port 142, the seventh valve port 161 is connected to the ninth valve port 163, and the eighth valve port 162 is connected to the tenth valve port 164. That is, when hot water needs to be prepared in the heating mode, the high-temperature gas output from the outlet of the compressor 11 first passes through the fourth valve port 151 and the fifth valve port 152 of the second reversing valve 15 before entering the refrigerant inlet 121 of the heat recovery heat exchanger 12. In the heat recovery heat exchanger 12, the high-temperature gas exchanges heat with the water in the domestic water tank 13, and after preparing hot water, it becomes medium-temperature gas. The medium-temperature gas output from the refrigerant outlet 122 of the heat recovery heat exchanger 12 passes through the first valve port 141 and the second valve port 142 of the first reversing valve 14 and the seventh valve port 161 and the ninth valve port 163 of the third reversing valve 16 before entering the refrigerant inlet 121 of the heat recovery heat exchanger 12. At the fourth refrigerant interface 212 of the air-conditioning side heat exchanger 21, the medium-temperature gas is converted into medium-temperature liquid after heat exchange with the circulating water in the terminal 22 in the air-conditioning side heat exchanger 21. The medium-temperature liquid outputted from the third refrigerant interface 211 of the air-conditioning side heat exchanger 21 passes through the liquid storage container 24 and then passes through the refrigerant main path and the enthalpy increase auxiliary path respectively. The medium-temperature liquid in the enthalpy increase auxiliary path is throttled and cooled by the auxiliary refrigerant flow regulating device 19 to become a low-temperature liquid. The low-temperature liquid absorbs the refrigerant heat from the refrigerant main path in the economizer 18 and becomes a relatively low-temperature gas, and finally enters the enthalpy increase port 111 of the compressor 11. The medium-temperature liquid in the main refrigerant circuit is cooled by heat exchange and becomes a low-temperature liquid. It is then throttled and cooled by the main refrigerant flow regulating device 20 to become a low-temperature liquid with a lower temperature. The liquid then enters the second refrigerant interface 172 of the outdoor heat exchanger 17. The low-temperature liquid evaporates and absorbs heat in the outdoor heat exchanger 17 to become a low-temperature gas. The low-temperature gas output by the first refrigerant interface 171 of the outdoor heat exchanger 17 passes through the eighth valve port 162 and the tenth valve port 164 of the third reversing valve 16 and then returns to the inlet of the compressor 11, thus repeating the cycle. The heat recovery heat exchanger 12 is connected to the domestic water tank 13, so that hot water can be prepared while heating in winter, thereby improving energy utilization.

[0063] As shown in Figure 5, in the heating mode, the fourth valve port 151 is connected to the fifth valve port 152 and the sixth valve port 153 respectively, the first valve port 141 is connected to the second valve port 142, the seventh valve port 161 is connected to the ninth valve port 163, and the eighth valve port 162 is connected to the tenth valve port 164. That is, when hot water needs to be prepared in the heating mode, the high-temperature gas output from the outlet of the compressor 11 passes through the fourth valve port 151 and the fifth valve port 152 of the second reversing valve 15 on one path and enters the refrigerant inlet 121 of the heat recovery heat exchanger 12, and passes through the fourth valve port 151 and the sixth valve port 153 of the second reversing valve 15 and the seventh valve port 161 and the ninth valve port 163 of the third reversing valve 16 on the other path and enters the fourth refrigerant interface 212 of the air-conditioning side heat exchanger 21. The high-temperature gas exchanges heat with the water in the domestic water tank 13 in the heat recovery heat exchanger 12 and becomes medium-temperature gas after preparing hot water. The medium-temperature gas output from the refrigerant outlet 122 of the heat recovery heat exchanger 12 passes through the first valve port 14 of the first reversing valve 141 and the second valve port 142 and the seventh valve port 161 and the ninth valve port 163 of the third reversing valve 16 enter the fourth refrigerant interface 212 of the air-conditioning side heat exchanger 21, and the medium-temperature gas is heat-exchanged with the circulating water in the terminal 22 in the air-conditioning side heat exchanger 21 to become a medium-temperature liquid. The medium-temperature liquid output from the third refrigerant interface 211 of the air-conditioning side heat exchanger 21 passes through the liquid storage container 24 and then passes through the refrigerant main path and the enthalpy increase auxiliary path respectively. The medium-temperature liquid in the enthalpy increase auxiliary path is throttled and cooled by the auxiliary refrigerant flow regulating device 19 to become a low-temperature liquid. The low-temperature liquid absorbs the refrigerant heat from the refrigerant main path in the economizer 18 to become a relatively low-temperature gas, and finally enters the enthalpy increase port 111 of the compressor 11. The medium-temperature liquid in the main refrigerant circuit is cooled by heat exchange and becomes a low-temperature liquid. It is then throttled and cooled by the main refrigerant flow regulating device 20 to become a low-temperature liquid with a lower temperature. The liquid then enters the second refrigerant interface 172 of the outdoor heat exchanger 17. The low-temperature liquid evaporates and absorbs heat in the outdoor heat exchanger 17 to become a low-temperature gas. The low-temperature gas output by the first refrigerant interface 171 of the outdoor heat exchanger 17 passes through the eighth valve port 162 and the tenth valve port 164 of the third reversing valve 16 and then returns to the inlet of the compressor 11, thus repeating the cycle. The heat recovery heat exchanger 12 is connected to the domestic water tank 13, so that hot water can be prepared while heating in winter, thereby improving energy utilization.

[0064] Specifically, the difference between the embodiments shown in Figures 4 and 5 is that in the embodiment shown in Figure 5, after passing through the fourth valve port 151 and the sixth valve port 153 of the second reversing valve 15 and the seventh valve port 161 and the ninth valve port 163 of the third reversing valve 16, it enters the air-conditioning side heat exchanger 21, which can better control the amount of refrigerant entering the heat recovery heat exchanger 12.

[0065] As shown in FIG. 6 , in pure hot water mode, the fourth valve port 151 is connected to the fifth valve port 152 , the first valve port 141 is connected to the third valve port 143 , and the eighth valve port 162 is connected to the tenth valve port 164 . That is, when only hot water needs to be prepared, the refrigerant output from the outlet of the compressor 11 passes through the fourth valve port 151 and the fifth valve port 152 of the second reversing valve 15 and then enters the refrigerant inlet 121 of the heat recovery heat exchanger 12. The refrigerant exchanges heat with the water in the domestic water tank 13 in the heat recovery heat exchanger 12 to prepare hot water. The refrigerant output from the refrigerant outlet 122 of the heat recovery heat exchanger 12 passes through the first valve port 141 and the third valve port 143 of the first reversing valve 14 and then enters the liquid storage container 24. The refrigerant output from the liquid storage container 24 passes through the refrigerant main path and the enthalpy increase auxiliary path respectively. The refrigerant in the enthalpy increase auxiliary path is throttled and cooled by the auxiliary refrigerant flow regulating device 19, and then absorbs the refrigerant heat from the refrigerant main path in the economizer 18, and finally enters the enthalpy increase port 111 of the compressor 11. After the refrigerant in the main refrigerant circuit has its temperature lowered by heat exchange, it is further throttled and cooled by the main refrigerant flow regulating device 20 to become the refrigerant with a lower temperature, and then enters the second refrigerant interface 172 of the outdoor heat exchanger 17. After the refrigerant evaporates and absorbs heat in the outdoor heat exchanger 17, the refrigerant output from the first refrigerant interface 171 passes through the eighth valve port 162 and the tenth valve port 164 of the third reversing valve 16 and then returns to the inlet of the compressor 11, thus circulating in a reciprocating manner. The heat recovery heat exchanger 12 is connected to the domestic water tank 13, so that the heat from the compressor 11 can be used alone in the heat recovery heat exchanger 12 for heat exchange with the water in the domestic water tank 13, making targeted use of energy. When making hot water, the refrigerant circuit is shortened and does not need to pass through the air-conditioning side heat exchanger 21, resulting in higher heat exchange efficiency.

[0066] As shown in FIG. 7 , in the cooling mode, the fourth valve port 151 is connected to the sixth valve port 153 , the seventh valve port 161 is connected to the eighth valve port 162 , and the ninth valve port 163 is connected to the tenth valve port 164 . That is, when cooling alone is performed in summer, the high-temperature gas output from the outlet of the compressor 11 passes through the fourth valve port 151 and the sixth valve port 153 of the second reversing valve 15 and the seventh valve port 161 and the eighth valve port 162 of the third reversing valve 16 and then enters the first refrigerant interface 171 of the outdoor heat exchanger 17. The high-temperature gas condenses and releases heat in the outdoor heat exchanger 17 and becomes a medium-temperature liquid. The medium-temperature liquid output from the second refrigerant interface 172 of the outdoor heat exchanger 17 passes through the refrigerant main circuit and the enthalpy increase auxiliary circuit respectively. The medium-temperature liquid in the enthalpy increase auxiliary circuit is throttled and cooled by the auxiliary refrigerant flow regulating device 19 and becomes a low-temperature liquid. The low-temperature liquid absorbs the refrigerant heat from the refrigerant main circuit in the economizer 18 and becomes a relatively low-temperature gas, and finally enters the enthalpy increase port 111 of the compressor 11. The medium-temperature liquid in the main refrigerant circuit is turned into a low-temperature liquid after its temperature is reduced by heat exchange, and is further throttled and cooled by the main refrigerant flow regulating device 20 to become a low-temperature liquid with a lower temperature, and then enters the third refrigerant interface 211 of the air-conditioning side heat exchanger 21. The low-temperature liquid exchanges heat with the circulating water in the terminal 22 in the air-conditioning side heat exchanger 21, and the low-temperature liquid absorbs the heat of the circulating water and evaporates to become a low-temperature gas. The low-temperature gas output from the fourth refrigerant interface 212 of the air-conditioning side heat exchanger 21 passes through the ninth valve port 163 and the tenth valve port 164 of the third reversing valve 16 and then returns to the inlet of the compressor 11, and circulates back and forth.

[0067] As shown in FIG. 8 , in the heating mode, the fourth valve port 151 is connected to the sixth valve port 153 , the seventh valve port 161 is connected to the ninth valve port 163 , and the eighth valve port 162 is connected to the tenth valve port 164 . That is, when heating alone is used in winter, the high-temperature gas output from the outlet of the compressor 11 passes through the fourth valve port 151 and the sixth valve port 153 of the second reversing valve 15 and the seventh valve port 161 and the ninth valve port 163 of the third reversing valve 16 and then enters the fourth refrigerant interface 212 of the air-conditioning side heat exchanger 21. The high-temperature gas is heat-exchanged with the circulating water in the terminal 22 in the air-conditioning side heat exchanger 21 and becomes a medium-temperature liquid. The medium-temperature liquid output from the third refrigerant interface 211 of the air-conditioning side heat exchanger 21 passes through the liquid storage container 24 and then passes through the refrigerant main path and the enthalpy increase auxiliary path respectively. The medium-temperature liquid in the enthalpy increase auxiliary path is throttled and cooled by the auxiliary refrigerant flow regulating device 19 and becomes a low-temperature liquid. The low-temperature liquid absorbs the refrigerant heat from the refrigerant main path in the economizer 18 and becomes a relatively low-temperature gas, and finally enters the enthalpy increase port 111 of the compressor 11. The medium-temperature liquid in the main refrigerant circuit is turned into a low-temperature liquid after its temperature is reduced by heat exchange, and is further throttled and cooled by the main refrigerant flow regulating device 20 to become a low-temperature liquid with a lower temperature, and then enters the second refrigerant interface 172 of the outdoor heat exchanger 17. The low-temperature liquid evaporates and absorbs heat in the outdoor heat exchanger 17 to become a low-temperature gas. The low-temperature gas output by the first refrigerant interface 171 of the outdoor heat exchanger 17 passes through the eighth valve port 162 and the tenth valve port 164 of the third reversing valve 16 and then returns to the inlet of the compressor 11, repeating the cycle.

[0068] It should be noted here that the above-mentioned high, medium and low temperatures are only relative expressions, and gas can also refer to a gas-liquid two-phase state or a gaseous state, which is not limited here.

[0069] In some specific embodiments, the outdoor side heat exchanger 17 is a fin type heat exchanger, the air conditioning side heat exchanger 21 is a plate type heat exchanger, the heat recovery heat exchanger 12 is a shell and tube type heat exchanger, the auxiliary refrigerant flow regulating device 19 and the main refrigerant flow regulating device 20 are electronic expansion valves or thermal expansion valves, and the terminal 22 may include an air disk and / or floor heating installed indoors, and may further include a hydraulic module connected between the air conditioning side heat exchanger 21 and the air disk and / or floor heating, which is not limited here.

[0070] By implementing this application, the following beneficial effects are achieved:

[0071] This application arranges the heat recovery heat exchanger 12, the domestic water tank 13 and the first reversing valve 14 between the outlet of the compressor 11 and the condenser, so that the high-temperature and high-pressure refrigerant output from the compressor 1 flows into the heat recovery heat exchanger 12, thereby realizing the preparation of hot water while cooling, the preparation of hot water while heating, and pure preparation of hot water, thereby achieving full utilization of heat and improving the flexibility, energy efficiency and stability of the system in different modes.

[0072] It can be understood that the above embodiments only express some implementation methods of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all fall within the scope of protection of the present application, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments; therefore, all equivalent changes and modifications made to the scope of the claims of the present application should fall within the scope of coverage of the claims of the present application.

Claims

1. A thermal energy storage system, characterized in that: include: A compressor, used to output refrigerant; Condensers and evaporators; A heat recovery heat exchanger, used to achieve heat exchange between the refrigerant and water, the heat recovery heat exchanger comprising a refrigerant inlet, a refrigerant outlet, a water inlet and a water outlet, the refrigerant inlet being connected to the outlet of the compressor; A domestic water tank, the domestic water tank is connected to the water inlet and the water outlet respectively to form a water loop for thermal energy storage; a first reversing valve, the first reversing valve comprising a first valve port, a second valve port and a third valve port, the first valve port being connected to the refrigerant outlet, the second valve port being connected to the condenser, and the third valve port being connected to the evaporator; Wherein, the water circuit for heat energy storage is used to store at least part of the heat of the refrigerant in the domestic water tank when the compressor is running.

2. The thermal energy storage system according to claim 1, characterized in that: The thermal energy storage system further comprises: The second reversing valve comprises a fourth valve port, a fifth valve port and a sixth valve port, the fourth valve port is connected to the outlet of the compressor, the fifth valve port is connected to the refrigerant inlet, and the sixth valve port is connected to the condenser.

3. The thermal energy storage system according to claim 2, characterized in that: The thermal energy storage system further comprises: a third reversing valve, the third reversing valve comprising a seventh valve port, an eighth valve port, a ninth valve port and a tenth valve port, the seventh valve port being connected to the outlet of the compressor and the second valve port respectively, and; The eighth valve port is connected to the condenser or the evaporator, the ninth valve port is connected to the evaporator or the condenser, and the tenth valve port is connected to the inlet of the compressor.

4. The thermal energy storage system according to claim 3, characterized in that: The first reversing valve and the second reversing valve are three-way valves, and the third reversing valve is a four-way valve.

5. The thermal energy storage system according to claim 3, characterized in that: The thermal energy storage system further comprises: An enthalpy increasing module, wherein a first end of the enthalpy increasing module is connected to the condenser, and a second end of the enthalpy increasing module is connected to the evaporator.

6. The thermal energy storage system according to claim 5, characterized in that: The enthalpy increase module includes an economizer, an auxiliary refrigerant flow regulating device and a main refrigerant flow regulating device, and the economizer includes a main refrigerant inlet, an auxiliary refrigerant inlet, a main refrigerant outlet and an auxiliary refrigerant outlet; Among them, the first end of the enthalpy increase module is divided into two paths, one path is connected to the evaporator after passing through the refrigerant main inlet, the refrigerant main outlet and the main refrigerant flow regulating device in sequence, and the other path is connected to the enthalpy increase port of the compressor after passing through the auxiliary refrigerant flow regulating device, the auxiliary refrigerant inlet and the auxiliary refrigerant outlet in sequence.

7. The thermal energy storage system according to claim 6, characterized in that: The thermal energy storage system further comprises: A pressure relief module, wherein the pressure relief module comprises a one-way valve, an inlet end of the one-way valve is connected to the main refrigerant flow regulating device, and an outlet end of the one-way valve is connected to the seventh valve port.

8. The thermal energy storage system according to claim 7, characterized in that: The thermal energy storage system further comprises: A liquid storage container, wherein the output end of the liquid storage container is connected to the first end of the enthalpy increasing module, and the input end of the liquid storage container is respectively connected to the main refrigerant flow regulating device and the third valve port.

9. The thermal energy storage system according to claim 1, characterized in that: The first valve port is in communication with the second valve port or the first valve port is in communication with the third valve port; When the first valve port is connected to the second valve port, the refrigerant passes through the refrigerant inlet, the refrigerant outlet, the first valve port, the second valve port and the condenser after coming out of the compressor to form a cooling refrigerant circuit or a heating refrigerant circuit, and at the same time, at least part of the heat of the refrigerant is stored in the domestic water tank through the water circuit for heat energy storage; When the first valve port is connected to the third valve port, the refrigerant comes out of the compressor and passes through the refrigerant inlet, the refrigerant outlet, the first valve port, the third valve port and the evaporator to form a refrigerant circuit of pure hot water.

10. The thermal energy storage system according to claim 9, characterized in that: In the cooling refrigerant circuit, the condenser is an outdoor heat exchanger, and the evaporator is an air-conditioning side heat exchanger; in the heating refrigerant circuit, the condenser is an air-conditioning side heat exchanger, and the evaporator is an outdoor heat exchanger; in the pure hot water refrigerant circuit, the evaporator is an outdoor heat exchanger.

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