A heat pump energy storage system and operation control method thereof

Abstract

The present invention discloses a heat pump energy storage system and its operation control method. The heat pump energy storage system includes a heat pump module, a cold storage tank, a heat storage tank, a pre-cooling and pre-heating module, and a first heat exchanger. The heat pump module includes a first compressor, a condenser, a throttle valve, and an evaporator, which are sequentially connected to form a heat pump circuit. The cold storage tank forms a cold storage circuit with the first heat source side of the evaporator, and is connected to a cold supply pipeline and a water supply main pipeline. The heat storage tank forms a heat storage circuit with the second cold source side of the condenser, and is also connected to a heat supply pipeline and a water supply main pipeline. The first heat exchanger has a first heat exchange side and a second heat exchange side. The first heat exchange side forms a pre-cooling circuit with the cold storage tank, and the first heat exchange side also forms a pre-heating circuit with the heat storage tank. The pre-cooling and pre-heating module forms a heat exchange circuit with the second heat exchange side, and is used to pre-cool water in the pre-cooling circuit and pre-heat water in the pre-heating circuit. The heat pump energy storage system can achieve two-way energy conservation and minimize operating costs.

Description

Technical Field

[0001] The present invention relates to the field of energy supply technology, and in particular to a heat pump energy storage system and an operation control method thereof. Background Art

[0002] In recent years, the demand for energy conservation in heating and cooling in the production and living processes has become increasingly significant. In many production and living water consumption heating and cooling processes, natural gas is used for heating, which not only has high operating costs but also has many safety hazards. Ammonia cooling or chillers are used for cooling, but the equipment has low energy efficiency and high electricity costs, and also generates a large amount of low-quality heat emissions and waste, resulting in low-quality energy consumption losses. Summary of the Invention

[0003] The present invention provides a heat pump energy storage system and an operation control method thereof. The heat pump energy storage system achieves the purpose of two-way energy saving and can minimize the system operation cost.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A heat pump energy storage system comprises: a heat pump module, a cold storage tank, a heat storage tank, a pre-cooling and pre-heating module and a first heat exchanger;

[0006] The heat pump module includes a first compressor, a condenser, a throttle valve, and an evaporator. The evaporator has a first cold source side and a first heat source side. The condenser has a second cold source side and a second heat source side. The first cold source side, the first compressor, the second heat source side, and the throttle valve are connected in sequence to form a heat pump circuit.

[0007] The cold storage tank is connected to the first heat source side to form a cold storage circuit, the cold storage circuit has a first circulating water pump, the cold storage tank is also connected to the user's cold supply pipeline, the cold supply pipeline has a second circulating water pump, the cold storage tank is connected to the water supply main pipeline through a first water supply pipeline, and the first water supply pipeline has a first water supply on-off valve;

[0008] The heat storage tank is connected to the second cold source side to form a heat storage circuit, the heat storage circuit is provided with a third circulating water pump, the heat storage tank is also connected to the user's heating pipeline, the heating pipeline is provided with a fourth circulating water pump, the heat storage tank is connected to the water supply main pipeline through a second water supply pipeline, and the second water supply pipeline is provided with a second water supply switch valve;

[0009] The first heat exchanger has a first heat exchange side and a second heat exchange side. The first heat exchange side is connected to the cold storage tank to form a pre-cooling circuit. The pre-cooling circuit has a first switch component for controlling its own opening and closing state and a fifth circulating water pump. The first heat exchange side is connected to the heat storage tank to form a preheating circuit. The preheating circuit has a second switch component for controlling its own opening and closing state and a sixth circulating water pump.

[0010] The precooling and preheating module is connected to the second heat exchange side to form a heat exchange circuit, which is used to precool the water in the precooling circuit and to preheat the water in the preheating circuit.

[0011] The heat pump energy storage system provided by the present invention includes a heat pump module, a cold storage tank, a heat storage tank, a pre-cooling and pre-heating module and a first heat exchanger. The evaporator, the first compressor, the condenser and the throttle valve in the heat pump module are connected in sequence to form a heat pump circuit. The cold storage tank and the evaporator are connected to form a cold storage circuit. The cold storage tank is also connected to the user's cold supply pipeline. The heat storage tank is connected to the condenser to form a heat storage circuit. The heat storage tank is also connected to the user's heating pipeline. The pre-cooling and pre-heating module is connected to the first heat exchanger to form a heat exchange circuit. The cold storage tank and the pre-cooling The preheating modules are connected to form a precooling circuit, and the cold storage tank is connected to the precooling and preheating modules to form a preheating circuit. By adjusting the switches on each circuit or the status of the circulating water pump, different operating conditions of the system can be achieved. When the heat pump module starts running, it can generate high-temperature hot water and low-temperature cold water through the heat pump and energy storage technology, and the precooling or preheating effect of the precooling and preheating module can make the water temperature of the high-temperature hot water and low-temperature cold water meet the requirements, thereby meeting the production and life energy consumption needs of low-temperature cooling and high-temperature heating at the same time. The above-mentioned heat pump energy storage system can use heat pump and energy storage technology to "replace gas with electricity" by utilizing low-quality heat in renewable energy and high-efficiency heat pump units to achieve high-temperature heating. At the same time, it uses tap water to extract heat and generate low-temperature cold water, achieving the purpose of two-way energy saving. It can also combine the characteristics of the energy consumption cycle and use peak and valley electricity prices to achieve cold / heat storage, thereby minimizing system operating costs.

[0012] Optionally, the pre-cooling and preheating module includes a second compressor, a reversing valve, a second heat exchanger and a circulation fan. The second compressor, the second heat exchange side, the reversing valve and the second heat exchanger are connected in sequence to form the heat exchange circuit. The circulation fan is arranged opposite to the second heat exchanger.

[0013] Optionally, the cold storage tank has a cold storage inlet, a cold storage outlet, a cold supply outlet and a cold water replenishment inlet;

[0014] The cold storage inlet is connected to the outlet of the first heat source side of the evaporator through a first cold storage pipeline, and the cold storage outlet is connected to the inlet of the first heat source side of the evaporator through a second cold storage pipeline, so that the cold storage tank and the first heat source side form a cold storage circuit, and the second cold storage pipeline is provided with the first circulating water pump, and the first circulating water pump is used to make the cold water in the cold storage circuit flow from the cold storage tank to the evaporator, the cold supply outlet is connected to the user's cold supply pipeline, and the cold water replenishment port is connected to the first replenishment pipeline.

[0015] Optionally, the heat storage tank has a heat storage inlet, a heat storage outlet, a heat supply outlet and a hot water supply inlet;

[0016] The heat storage inlet is communicated with the outlet on the second cold source side of the condenser through a first heat storage pipeline, and the heat storage outlet is communicated with the inlet on the second cold source side of the condenser through a second heat storage pipeline, so that the heat storage pipe and the second cold source side form a heat storage circuit, and the second heat storage pipeline is provided with the third circulating water pump, and the third circulating water pump is used to make the hot water in the heat storage circuit flow from the heat storage tank to the condenser, the heat supply outlet is communicated with the user's heat supply pipeline, and the hot water replenishing port is communicated with the second water replenishing pipeline.

[0017] Optionally, the first heat exchange side of the first heat exchanger includes a first heat exchange channel and a second heat exchange channel capable of exchanging heat with the second heat exchange side;

[0018] The first port of the first heat exchange channel is connected to the cold water replenishment port of the cold storage tank through a first pre-cooling pipeline, the second port of the first heat exchange channel is connected to the second port of the second heat exchange channel through a second pre-cooling pipeline, and the first port of the second heat exchange channel is connected to the cold storage outlet of the cold storage tank through a third pre-cooling pipeline, so that the first heat exchange side, the first heat source side and the cold storage tank are connected in sequence to form a pre-cooling circuit;

[0019] Among them, the first precooling pipeline is provided with the fifth circulating water pump and the first precooling switch valve, the fifth circulating water pump is used to make the cold water in the precooling circuit flow from the cold storage tank toward the first heat exchanger, the second preheating pipeline is provided with a second precooling switch valve, and the third preheating pipeline is provided with a third precooling switch valve. The first precooling switch valve, the second precooling switch valve and the third precooling switch valve constitute the first switch assembly.

[0020] Optionally, the first pre-cooling switch valve is located between the outlet of the fifth circulating water pump and the first port of the first heat exchange channel, and the first water supply pipeline can be connected to the cold water supply port of the cold storage tank and the inlet of the fifth circulating water pump respectively through the first pre-cooling pipeline.

[0021] Optionally, the second port of the first heat exchange channel is connected to the hot water replenishment port of the heat storage tank through a first preheating pipeline, the first port of the first heat exchange channel is connected to the first port of the second heat exchange channel through a second preheating pipeline, and the second port of the second heat exchange channel is connected to the heat storage outlet of the heat storage tube through a third preheating pipeline, so that the first heat exchange side is connected to the heat storage tank to form a preheating circuit, and the preheating circuit includes a first sub-circuit formed by the mutual communication between the first heat exchange side and the heat storage tank, and a second sub-circuit formed by the sequential communication between the first heat exchange side, the second cold source side, and the heat storage tank;

[0022] Among them, the first preheating pipeline is provided with a sixth circulating water pump and a first preheating switch valve, the fifth circulating water pump is used to make the hot water in the preheating circuit flow from the heat storage tank toward the first heat exchanger, the second preheating pipeline is provided with a second preheating switch valve, and the third preheating pipeline is provided with a third preheating switch valve. The first preheating switch valve, the second preheating switch valve and the third preheating switch valve constitute the second switch assembly.

[0023] Optionally, the first preheating switch valve is located between the outlet of the sixth circulating water pump and the second port of the first heat exchange channel, and the second water supply pipeline is connected to the hot water supply port of the heat storage tank and the inlet of the sixth circulating water pump respectively through the first preheating pipeline.

[0024] Optionally, a constant pressure water make-up device is provided on the connecting pipeline.

[0025] Optionally, it also includes a temperature sensor assembly, a liquid level sensor assembly and a control module;

[0026] The temperature sensor assembly is used to detect the water temperature of the cold water at the water supply main line, the water temperature of the water in the precooling circuit before and after heat exchange with the precooling and preheating module, the water temperature of the water in the preheating circuit before and after heat exchange with the precooling and preheating module, the water temperature at the outlet and inlet of the first heat source side of the evaporator, the water temperature at the outlet and inlet of the second cold source side of the condenser, and the water temperature of the cold water in the cold storage tank and the hot water in the heat storage tank;

[0027] The liquid level sensor assembly is used to detect the water level of cold water in the cold storage tank and hot water in the heat storage tank;

[0028] The control module is signal-connected to the temperature sensor assembly, the liquid level sensor assembly, the first compressor in the heat pump module, the pre-cooling and preheating module, the first to sixth circulating water pumps, the first switch assembly, the second switch assembly, the first water replenishment switch valve, and the second water replenishment switch valve, and is used to control the status of the temperature sensor assembly, the liquid level sensor assembly, the heat pump module, the pre-cooling and preheating module, the first to sixth circulating water pumps, the first switch assembly, the second switch assembly, the first water replenishment switch valve, and the second water replenishment switch valve according to status information detected by the temperature sensor assembly and the liquid level sensor assembly.

[0029] The present invention also provides an operation control method for a heat pump energy storage system, which uses any one of the heat pump energy storage systems provided in the above technical solutions, comprising:

[0030] Obtain status information of the heat pump energy storage system;

[0031] According to the status information, the states of the first compressor, the pre-cooling and preheating module, the first to sixth circulating water pumps, the first switch assembly, the second switch assembly, the first water replenishment switch valve and the second water replenishment switch valve in the heat pump module are controlled to switch the operating conditions of the heat pump energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of a heat pump energy storage system provided by an embodiment of the present invention;

[0033] Figure 2 A flow chart of an operation control method of a heat pump energy storage system provided by an embodiment of the present invention;

[0034] Figure 3 A state diagram of a heat pump energy storage system provided by an embodiment of the present invention;

[0035] Figure 4 A state diagram of another heat pump energy storage system provided by an embodiment of the present invention;

[0036] Figure 5 A state diagram of another heat pump energy storage system provided by an embodiment of the present invention;

[0037] Figure 6 A state diagram of another heat pump energy storage system provided by an embodiment of the present invention;

[0038] Figure 7 A state diagram of another heat pump energy storage system provided in an embodiment of the present invention.

[0039] icon:

[0040] 1-first compressor; 2-condenser; 3-throttle valve; 4-evaporator; 5-cold storage tank; 6-heat storage tank; 7-precooling and preheating module; 71-second compressor; 72-reversing valve; 73-second heat exchanger; 74-circulating fan; 8-first heat exchanger; 9-constant pressure water supply device;

[0041] G1-first circulating water pump; G2-second circulating water pump; G3-third circulating water pump; G4-fourth circulating water pump; G5-fifth circulating water pump; G6-sixth circulating water pump;

[0042] M11 - first water supply switch valve; M21 - second water supply switch valve; M31 - first precooling switch valve; M32 - second precooling switch valve; M33 - third precooling switch valve; M41 - first preheating switch valve; M42 - second preheating switch valve; M43 - third preset switch valve;

[0043] S0-water supply main line; S11-first water supply line; S21-second water supply line; S31-cooling line; S41-heating line; S51-first cold storage line; S52-second cold storage line; S61-first heat storage line; S62-second heat storage line; S71-first pre-cooling line; S72-second pre-cooling line; S73-third pre-cooling line; S81-first pre-heating line; S82-second pre-heating line; S83-third pre-heating line. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] Please refer to Figure 1 The present invention provides a heat pump energy storage system, comprising: a heat pump module, a cold storage tank 5, a heat storage tank 6, a pre-cooling and pre-heating module 7 and a first heat exchanger 8;

[0046] The heat pump module includes a first compressor 1, a condenser 2, a throttle valve 3, and an evaporator 4. The evaporator 4 has a first cold source side and a first heat source side. The condenser 2 has a second cold source side and a second heat source side. The first cold source side, the first compressor 1, the second heat source side, and the throttle valve 3 are connected in sequence to form a heat pump circuit.

[0047] The cold storage tank 5 is connected to the first heat source side to form a cold storage circuit. The cold storage circuit has a first circulating water pump G1. The cold storage tank 5 is also connected to the user's cooling pipe S31. The cooling pipe S31 has a second circulating water pump G2. The cold storage tank 5 is connected to the main water supply pipe S0 through a first water supply pipe S11. The first water supply pipe S11 has a first water supply switch valve M11.

[0048] The heat storage tank 6 is connected to the second cold source side to form a heat storage circuit. The heat storage circuit has a third circulating water pump G3. The heat storage tank 6 is also connected to the user's heating pipeline S41. The heating pipeline S41 has a fourth circulating water pump G4. The heat storage tank 6 is connected to the water supply main pipeline S0 through the second water supply pipeline S21. The second water supply pipeline S21 has a second water supply switch valve M21.

[0049] The first heat exchanger 8 has a first heat exchange side and a second heat exchange side. The first heat exchange side is connected to the cold storage tank 5 to form a pre-cooling circuit. The pre-cooling circuit has a first switch component for controlling its own on / off state and a fifth circulating water pump G5. The first heat exchange side is connected to the heat storage tank 6 to form a preheating circuit. The preheating circuit has a second switch component for controlling its own on / off state and a sixth circulating water pump G6.

[0050] The precooling and preheating module 7 is connected to the second heat exchange side to form a heat exchange circuit, which is used to precool the water in the precooling circuit and to preheat the water in the preheating circuit.

[0051] The heat pump energy storage system provided by the embodiment of the present invention includes a heat pump module, a cold storage tank 5, a heat storage tank 6, a pre-cooling and preheating module 7 and a first heat exchanger 8. The evaporator 4, the first compressor 1, the condenser 2 and the throttle valve 3 in the heat pump module are connected in sequence to form a heat pump circuit. The cold storage tank 5 is connected to the evaporator 4 to form a cold storage circuit. The cold storage tank 5 is also connected to the user's cooling pipeline S31. The heat storage tank 6 is connected to the condenser 2 to form a heat storage circuit. The heat storage tank 6 is also connected to the user's heating pipeline S41. The pre-cooling and preheating module 7 is connected to the first heat exchanger 8 to form an exchange circuit. The heat circuit, the cold storage tank 5 and the pre-cooling and preheating module 7 are connected to form a pre-cooling circuit, and the cold storage tank 5 and the pre-cooling and preheating module 7 are connected to form a pre-heating circuit. By adjusting the switches on each circuit or the status of the circulating water pump, different operating conditions of the system can be achieved. When the heat pump module starts running, it can produce high-temperature hot water and low-temperature cold water through the heat pump and energy storage technology, and the pre-cooling or pre-heating effect of the pre-cooling and pre-heating module 7 can make the water temperature of the high-temperature hot water and low-temperature cold water meet the requirements, thereby meeting the production and living energy consumption needs of low-temperature cooling and high-temperature heating at the same time. The above-mentioned heat pump energy storage system can use heat pump and energy storage technology to "replace gas with electricity" by utilizing low-quality heat in renewable energy and using high-efficiency heat pump units to achieve high-temperature heating. At the same time, it uses tap water to extract heat and produce low-temperature cold water, achieving the purpose of two-way energy saving. It can also combine the characteristics of the energy consumption cycle and take advantage of peak and valley electricity prices to achieve cold / heat storage and minimize system operating costs.

[0052] Specifically, the pre-cooling and pre-heating module 7 may include a second compressor 71, a reversing valve 72, a second heat exchanger 73, and a circulating fan 74. The second compressor 71, the second heat exchange side, the reversing valve 72, and the second heat exchanger 73 are sequentially connected to form a heat exchange circuit. The circulating fan 74 is arranged opposite to the second heat exchanger 73. The pre-cooling and pre-heating module 7 is an air-cooled heat pump that can utilize low-quality heat from renewable energy sources such as air energy. Among them, through the reversing effect of the reversing valve 72, the second heat exchanger 73 can be switched to a heat dissipation or heat absorption state, thereby realizing the switching between the pre-cooling state and the pre-heating state of the pre-cooling and pre-heating module 7. When the pre-cooling and pre-heating module 7 is started, the second compressor 71 is started, the reversing valve 72 is opened, and the circulating fan 74 is started. When the pre-cooling and pre-heating module 7 is shut down, the second compressor 71 is shut down, the reversing valve 72 is closed, and the circulating fan 74 is shut down.

[0053] Specifically, the first compression pump may be a screw compressor, the second compressor 71 may be a scroll compressor, and the structures of the first compressor 1 and the second compressor 71 may also be other combinations, which are not limited here and depend on actual conditions.

[0054] Specifically, the above-mentioned cold storage tank 5 can have a cold storage inlet, a cold storage outlet, a cold supply outlet and a cold water replenishment port; wherein, the cold storage inlet is connected to the outlet of the first heat source side of the evaporator 4 through the first cold storage pipeline S51, and the cold storage outlet is connected to the inlet of the first heat source side of the evaporator 4 through the second cold storage pipeline S52, so that the cold storage tank 5 and the first heat source side form a cold storage circuit, and the second cold storage pipeline S52 is provided with a first circulating water pump G1, and the first circulating water pump G1 is used to make the cold water in the cold storage circuit flow from the cold storage tank 5 to the evaporator 4 to meet the cold storage demand; the cold supply outlet is connected to the user's cold supply pipeline S31, so as to supply cold water to the user; the cold water replenishment port is connected to the first water replenishment pipeline S11, so as to replenish water in the cold storage tank 5.

[0055] Specifically, the above-mentioned heat storage tank 6 can have a heat storage inlet, a heat storage outlet, a heat supply outlet and a hot water replenishment port; wherein, the heat storage inlet is connected to the outlet on the second cold source side of the condenser 2 through a first heat storage pipe S61, and the heat storage outlet is connected to the inlet on the second cold source side of the condenser 2 through a second heat storage pipe S62, so that the heat storage pipe and the second cold source side form a heat storage loop, and the second heat storage pipe S62 is provided with a third circulating water pump G3, and the third circulating water pump G3 is used to make the hot water in the heat storage loop flow from the heat storage tank 6 to the condenser 2 to meet the heat storage demand; the heat supply outlet is connected to the user's heating pipe S41, and can supply hot water to the user; the hot water replenishment port is connected to the second water replenishment pipe S21, and can realize water replenishment in the heat storage tank 6.

[0056] In the above-mentioned heat pump energy storage system, the first heat exchange side of the first heat exchanger 8 may specifically include a first heat exchange channel and a second heat exchange channel that can exchange heat with the second heat exchange side; wherein, the first port of the first heat exchange channel can be connected to the cold water replenishing port of the cold storage tank 5 through the first precooling pipe S71, the second port of the first heat exchange channel can be connected to the second port of the second heat exchange channel through the second precooling pipe S72, and the first port of the second heat exchange channel can be connected to the cold storage outlet of the cold storage tank 5 through the third precooling pipe S73, so that the first heat exchange side, the first heat source side and the cold storage tank 5 are connected in sequence to form a precooling circuit, and the precooling and preheating module 7 can realize precooling of the fourth circulation loop to ensure that the temperature of the cold water supplied to the user is within a preset range;

[0057] Specifically, the first precooling pipeline S71 is provided with a fifth circulating water pump G5 and a first precooling switch valve M31. The fifth circulating water pump G5 is used to flow the cold water in the precooling circuit from the cold storage tank 5 toward the first heat exchanger 8. The second preheating pipeline S82 is provided with a second precooling switch valve M32, and the third preheating pipeline S83 is provided with a third precooling switch valve M33. The first precooling switch valve M31, the second precooling switch valve M32, and the third precooling switch valve M33 constitute a first switch assembly. When the first switch assembly is in the open state, the first precooling switch valve M31, the second precooling switch valve M32, and the third precooling switch valve M33 are all open. When the first switch assembly is in the closed state, the first precooling switch valve M31, the second precooling switch valve M32, and the fourth precooling switch valve are all closed, thereby enabling the first switch assembly to adjust the on-off state of the fourth circulation circuit.

[0058] Specifically, the first precooling switch valve M31 can be located between the outlet of the fifth circulating water pump G5 and the first port of the first heat exchange channel, and the first water supply pipeline S11 can be connected to the cold water supply port of the cold storage tank 5 and the inlet of the fifth circulating water pump G5 through the first precooling pipeline S71, respectively, which can simplify the connecting pipelines of the system, facilitate installation, and well realize the precooling function of the system.

[0059] In the above-mentioned heat pump energy storage system, the second port of the first heat exchange channel can be connected to the hot water replenishment port of the heat storage tank 6 through the first preheating pipe S81, the first port of the first heat exchange channel can be connected to the first port of the second heat exchange channel through the second preheating pipe S82, and the second port of the second heat exchange channel can be connected to the heat storage outlet of the heat storage pipe through the third preheating pipe S83, so that the first heat exchange side is connected to the heat storage tank to form a preheating circuit. The preheating circuit includes a first sub-circuit formed by the mutual communication between the first heat exchange side and the heat storage tank, and a second sub-circuit formed by the sequential communication between the first heat exchange side, the second cold source side, and the heat storage tank. The precooling and preheating module 7 can realize preheating of the fifth circulation loop to ensure that the temperature of the hot water supplied to the user is within a preset range;

[0060] Specifically, the first preheating line S81 is provided with a sixth circulating water pump G6 and a first preheating on / off valve M41. The fifth circulating water pump G5 is used to direct the hot water in the preheating circuit from the heat storage tank 6 to the first heat exchanger 8. The second preheating line S82 is provided with a second preheating on / off valve M42, and the third preheating line S83 is provided with a third preheating on / off valve M43. The first preheating on / off valve M41, the second preheating on / off valve M42, and the third preheating on / off valve M43 constitute a second switch assembly. When the second switch assembly is open, the first, second, and third preheating on / off valves M41, M42, and M43 are all open. When the second switch assembly is closed, the first, second, and third preheating on / off valves M41, M42, and M43 are all closed, enabling the first switch assembly to regulate the on / off state of the fifth circulation circuit.

[0061] Among them, the above-mentioned first to third precooling switch valves M31 to M33, and the first to third preheating switch valves M41 to M43 can all be electric valves, and the first water replenishment switch valve M11 and the stacked water supply switch valve can also be electric valves.

[0062] Specifically, the above-mentioned first preheating switch valve M41 can be located between the outlet of the sixth circulating water pump G6 and the second port of the first heat exchange channel, and the second water supply pipeline S21 can be connected to the hot water supply port of the heat storage tank 6 and the inlet of the sixth circulating water pump G6 through the first preheating pipeline S81, respectively, which can simplify the connection pipelines of the system, facilitate installation, and well realize the preheating function of the system.

[0063] In the above heat pump energy storage system, a constant pressure water replenisher 9 is provided on the above connecting pipeline to ensure stable pressure water replenishment during the water replenishment process.

[0064] The above-mentioned heat pump energy storage system also includes a temperature sensor assembly, a liquid level sensor assembly and a control module; the temperature sensor assembly is used to detect the water temperature of the cold water at the water supply main line S0, the water temperature of the water in the precooling circuit before and after heat exchange with the precooling and preheating module 7, the water temperature of the water in the preheating circuit before and after heat exchange with the precooling and preheating module 7, the water temperature at the outlet and inlet of the first heat source side of the evaporator 4, the water temperature at the outlet and inlet of the second cold source side of the condenser 2, and the water temperature of the cold water in the cold storage tank 5 and the hot water in the heat storage tank 6; the liquid level sensor assembly is used to detect the water level of the cold water in the cold storage tank 5 and the hot water in the heat storage tank 6;

[0065] Among them, the control module can be signal-connected with the temperature sensor assembly, the liquid level sensor assembly, the first compressor in the heat pump module, the pre-cooling and preheating module 7, the first circulating water pump G1 to the sixth circulating water pump G6, the first switch assembly, the second switch assembly, the first water replenishment switch valve M11 and the second water replenishment switch valve M21, and is used to control the status of the temperature sensor assembly, the liquid level sensor assembly, the heat pump module, the pre-cooling and preheating module 7, the first circulating water pump G1 to the sixth circulating water pump G6, the first switch assembly, the second switch assembly, the first water replenishment switch valve M11 and the second water replenishment switch valve M21 according to the status information detected by the temperature sensor assembly and the liquid level sensor assembly.

[0066] The embodiment of the present invention also provides an operation control method of a heat pump energy storage system, which uses any one of the heat pump energy storage systems provided in the above technical solutions, such as Figure 2 As shown, the method includes:

[0067] S201: Obtaining status information of the heat pump energy storage system;

[0068] S202: Control the states of the first compressor, the pre-cooling and preheating module, the first to sixth circulating water pumps, the first switch assembly, the second switch assembly, the first water replenishment switch valve, and the second water replenishment switch valve in the heat pump module according to the state information to switch the operating conditions of the heat pump energy storage system.

[0069] In the operation control method of the heat pump energy storage system provided in an embodiment of the present invention, the status information of the heat pump energy storage system is first obtained, and then the status of the first compressor, the pre-cooling and preheating module 7, the first circulating water pump G1 to the sixth circulating water pump G6, the first switch component, the second switch component, the first water replenishment switch valve M11 and the second water replenishment switch valve M21 are controlled according to the status information to switch the heat pump energy storage system to different operating conditions, thereby achieving the purpose of two-way energy saving of the heat pump energy storage system. In addition, the characteristics of the energy consumption cycle can be combined with the peak and valley electricity prices to achieve cold storage / heat storage, thereby minimizing the system operating costs.

[0070] Specifically, the above status information may include the water temperature of the cold water at the water make-up main line S0, the water temperature at the outlet and inlet of the first heat source side of the evaporator 4, the water temperature at the outlet and inlet of the second cold source side of the condenser 2, the water temperature before and after heat exchange in the pre-cooling circuit, the water temperature before and after heat exchange in the preheating circuit, and the water temperature and water level of the cold water in the cold storage tank 5 and the hot water in the heat storage tank 6.

[0071] In the above-mentioned operation control method of the heat pump energy storage system, when the heat pump energy storage system starts to operate, the water levels in the cold storage tank 5 and the heat storage tank 6 do not meet the requirements, and the heat pump energy storage system needs to be initially replenished with water. The specific water replenishment process of this method can be as follows:

[0072] When the heat pump energy storage system starts to operate, the first compressor 1 is controlled to shut down; at the same time, the first circulating water pump G1, the second circulating water pump G2, the fifth circulating water pump G5, the first switch component are closed, and the first water supply switch valve M11 is opened until the water level L in the cold storage tank reaches C The first water supply line S11 is connected to the cold storage tank 5 to supply water to the cold storage tank 5. When the water level of the cold water in the cold storage tank 5 reaches the first preset cold water level L11, the first water supply switch valve M11 can be controlled to close to stop supplying water to the cold storage tank 5. At the same time, the third circulating water pump G3 is started, the fourth circulating water pump G4 is shut down, the sixth circulating water pump G6 is started, the second switch component is opened, and the second switch valve is opened until the water level L11 in the cold storage tank is reached. H When the water level of the hot water in the heat storage tank 6 reaches the first preset cold water level L21, the second water replenishment switch valve M21 can be controlled to close to stop replenishing the water in the heat storage tank 6. In the subsequent cooling and heating working conditions, in order to ensure that the compressor of the heat pump circuit can be started, the temperature difference between the water in the cold storage circuit and the water in the heat storage circuit is required. Therefore, during the initial water replenishment process, the pre-cooling and preheating module 7 can be controlled to start preheating at the same time. Figure 3 As shown, the second compressor 71 can be controlled to start, the reversing valve 72 can be opened, the circulating fan 74 can be started, the second heat exchanger 73 can absorb heat, and the precooling and preheating module 7 can preheat the water in the heat storage tank 6 through the first sub-loop in the fifth circulation loop until the hot water temperature T2 in the heat storage tank is equal to the sum of the hot water temperature T1 in the cold storage tank and the first preset temperature difference, so as to achieve the initial water replenishment working condition of the heat pump energy storage system.

[0073] Among them, Figure 3 The figure shows the operating status of each circuit during the pre-cooling preset module preheating process under the initial water replenishment condition of the heat pump energy storage system. The arrows indicate the direction of water flow in the system. Dashed lines indicate no water flow in that pipe, while solid lines indicate water flow. The first preheating temperature difference is the difference between the hot water temperature T2 in the thermal storage tank and the hot water temperature T1 in the cold storage tank after the initial water replenishment condition is completed. For example, the first preset temperature difference can be set to 10°C. Other values ​​are also possible, and are not limited here and can be selected based on actual conditions.

[0074] In the operation control method of the heat pump energy storage system, after the initial water replenishment of the heat pump energy storage system is completed, it is necessary to cool and heat the water in the cold storage tank 5 and the heat storage tank 6. The specific steps may include:

[0075] First, control the first water supply switch valve M11 to be closed, the second water supply switch valve M21 to be closed, the second circulating water pump G2 to be shut down, the fourth circulating water pump G4 to be shut down, the fifth circulating water pump G5 to be shut down, the sixth circulating water pump G6 to be shut down, the first switch component to be closed, the second switch component to be opened, the pre-cooling and preheating module 7 to be shut down, and control the first circulating water pump G1 to be started, the third circulating water pump G3 to be started, and the first compressor 1 to be started; the first compressor 1 is started, the first circulating water pump G1 and the second circulating water pump G2 are started, which enables the heat pump module to absorb the heat in the cold storage circuit and transfer the absorbed heat to the heat storage circuit. Through the heat pump technology, "electricity can replace gas", and high-efficiency heat pump units can be used to achieve high-temperature heating. At the same time, tap water is used to supply water to extract heat and generate low-temperature cold water, thereby achieving two-way energy saving. In addition, the characteristics of the energy consumption cycle can be combined with peak and valley electricity prices to achieve cold / heat storage, thereby minimizing system operating costs.

[0076] Then, the water temperature at the outlet of the first heat source side of the evaporator 4 and the water temperature at the outlet of the second cold source side of the condenser 2 are obtained to determine whether the heat exchange between the heat pump module and the cold storage circuit and the heat storage circuit can meet the cooling and heating requirements;

[0077] Among them, if the water temperature T3 at the outlet of the first heat source side of the evaporator is less than or equal to the preset cold water temperature and the water temperature T4 at the outlet of the second cold source side of the condenser is less than the preset hot water temperature, it means that the heat exchange of the heat pump module cannot meet the heating demand of the heat storage circuit. In order to meet the heating demand of the heat storage circuit, it is necessary to preheat the water in the heat storage tank 6, then the sixth circulating water pump G6 is controlled to start and the precooling and preheating module 7 is controlled to start to preheat the water in the preheating circuit. Figure 4 As shown, the pre-cooling and preheating module 7 is started to preheat the hot water in the heat storage tank 6 through the second sub-circuit in the preheating circuit until the water temperature T3 at the outlet of the first heat source side of the evaporator is less than or equal to the first preset cold water temperature and the water temperature T4 at the outlet of the second cold source side of the condenser is greater than or equal to the preset hot water temperature. At this time, the pre-cooling and preheating module 7 can be turned off, which can meet the cooling and heating needs, so as to realize the cooling and heating working conditions of the heat pump energy storage system, and realize cold and heat storage that meets user needs, and the pre-cooling and preheating module 7 can use low-quality heat in air energy for pre-cooling or preheating.

[0078] Among them, Figure 4The figure shows the operating status of each circuit during pre-cooling and pre-heating of the heat pump energy storage system under cooling and heating conditions. The arrows indicate the direction of water flow in the system. A dotted line indicates no flow in that pipe, and a solid line indicates flow. The preset cold water temperature is the target temperature that the cold water in the cold storage tank 5 needs to reach. For example, the preset cold water temperature can be set to 10°C. The preset hot water temperature is the target temperature that the hot water in the thermal storage tank 6 needs to reach. For example, the preset hot water temperature can be 50°C. The preset cold water temperature and the preset hot water temperature can also be set to other values, which are not limited here and can be selected according to actual conditions.

[0079] The operation control method of the heat pump energy storage system can use the water in the cold storage tank 5 and the heat storage tank 6 to supply water to the user when the user needs cold water or hot water after the cooling and heating conditions of the heat pump energy storage system are completed, thereby saving energy. The specific steps may include:

[0080] If the cold water temperature T1 in the cold storage tank is equal to the preset cold water temperature and the water level L in the cold storage tank is C The second circulating water pump G2 is controlled to start until the water level in the cold storage tank reaches L12. C It is closed after being less than or equal to the second preset cold water level L12 to provide cold water to the user, wherein the sum of the difference between the second preset cold water level L12 and the first water level is less than the first preset cold water level L11;

[0081] If the hot water temperature T1 in the heat storage tank is equal to the preset hot water temperature and the water level L in the heat storage tank is H If the water level in the heat storage tank is greater than the sum of the second preset hot water level L22 and the difference between the second water level, the fourth circulating water pump G4 is controlled to start until the water level in the heat storage tank is L H It is closed after being less than or equal to the second preset hot water level L22 to provide hot water for the user, wherein the sum of the difference between the second preset hot water level L22 and the second water level is less than the first preset hot water level L21.

[0082] Among them, Figure 5The figure shows the operating status of each circuit in the heat pump energy storage system under cooling and heating conditions. Arrows indicate the direction of water flow in the system. Dashed lines indicate no flow in that pipe, and solid lines indicate flow. The first preset cold water level L11 is the maximum level of cold water in the cold storage tank 5, the second preset cold water level L12 is the minimum level of cold water in the cold storage tank 5 to ensure system operation, and the first water level difference is a set differential level to ensure safe system operation. For example, the first water level difference can be 5L. The first preset hot water level L21 is the maximum level of hot water in the thermal storage tank 6, and the second preset cold water level L22 is the minimum level of hot water in the thermal storage tank 6 to ensure system operation. The second water level difference is a set differential level to ensure safe system operation. For example, the second water level difference can be 5L. The specific values ​​of the first preset cold water level, the second preset cold water level, the first preset hot water level, the second preset hot water level, and the first water level difference and the second water level difference are not limited here and will be determined according to actual conditions.

[0083] In the above-mentioned operation control method of the heat pump energy storage system, after the heat pump energy storage system supplies cold water and hot water to the user, the water levels in the cold storage tank 5 and the heat storage tank 6 begin to drop. At this time, water can be replenished while supplying cold and hot water, making it convenient for users to use cold water and hot water. Specifically, in the following example, Figure 1 In the case where the first water supply pipe S11 shown in FIG. 1 is connected to the cold water supply port of the cold storage tank 5 and the inlet of the fifth circulating water pump G5 respectively through the first precooling pipe S71, and the second water supply pipe S21 is connected to the hot water supply port of the heat storage tank 6 and the inlet of the sixth circulating water pump G6 respectively through the first preheating pipe S81, and the heat pump energy storage system is supplying cold water and hot water to the user, the operation control method includes:

[0084] If the water level in the cold storage tank is L C Less than or equal to the sum of the difference between the second preset cold water level L12 and the first water level, the water level L in the heat storage tank H When the temperature is less than or equal to the sum of the second preset hot water level L22 and the difference between the second water level and the second water level, and the water temperature T5 at the water supply main line is greater than the preset water supply temperature, the first water supply switch valve M11 is opened, the second water supply switch valve M21 is opened, the first switch component is opened, the second switch component is closed, the first circulating water pump G1 to the fifth circulating water pump G5 are started, and the sixth circulating water pump G6 is shut down; this process can make the pre-cooling circuit conductive, replenish the cold storage tank 5 with water through the pre-cooling circuit, and directly replenish the heat storage tank 6 with water through the first preheating pipe S81; the preset water supply temperature can be a temperature near which pre-cooling and preheating are not required during this replenishment process. If the water temperature at the water supply main line S0 is greater than the preset water supply temperature, it means that the inlet water temperature is high and the cold side energy is insufficient. It is necessary to pre-cool the water when replenishing the cold storage tank 5. If the water temperature in the cold storage tank 5 changes during the replenishment process, the cold water entering the pre-cooling circuit is pre-cooled after the cold water temperature reaches a certain change.

[0085] Next, the water temperature T6 at the inlet of the evaporator on the first heat source side and the water temperature T7 at the cold water supply port of the cold storage tank are obtained; based on the changes in the water temperature T6 at the inlet of the evaporator on the first heat source side and the water temperature T7 at the cold water supply port of the cold storage tank, it is determined whether the water to be supplied to the cold storage tank 5 needs to be pre-cooled;

[0086] Among them, if the water temperature T6 at the inlet of the first heat source side of the evaporator is greater than the difference between the preset cold water temperature and the second preset temperature difference, and the water temperature T7 at the cold water supply port of the cold storage tank is greater than the difference between the first preset target water temperature and the third preset temperature difference at the first port of the second heat exchange channel of the first heat exchanger 8, it means that during the water replenishment process, the heat pump module alone cannot make the cold water in the cold storage tank 5 reach the preset cold water temperature, and the cold water replenished into the cold storage tank 5 needs to be pre-cooled, then the preheating and precooling module is controlled to start pre-cooling the water in the pre-cooling circuit until the water temperature T8 at the first port of the second heat exchange channel is less than or equal to the difference between the actual water temperature T7 at the cold water supply port of the cold storage tank and the fourth preset temperature difference, then the pre-cooling and preheating module 7 can be turned off to stop pre-cooling, so that the heat pump energy storage system can replenish water for users while supplying cold water and hot water. During this process, if the water level L in the cold storage tank C When the water level in the heat storage tank is equal to the first preset cold water level L11, water replenishment to the cold storage tank 5 can be stopped. H When the water level reaches the first preset hot water level L21, water replenishment into the heat storage tank 6 can be stopped.

[0087] Among them, the above-mentioned preset make-up water temperature can be 15°C, the second preset temperature difference can be set to 5°C, the preset target water temperature can be set to 15°C, the third preset temperature difference can be set to 5°C, and the fourth preset temperature difference can be set to 5°C. The specific values ​​of the preset make-up water temperature, the preset cold water temperature, the second preset temperature difference, the first preset target water temperature, the third preset temperature difference and the fourth preset temperature difference are not limited here and can be set according to actual conditions.

[0088] like Figure 6 The figure shows the state diagram of the heat pump cold storage system supplying cooling and heating to users while replenishing water when the water temperature T5 at the main water replenishment line is greater than the preset water replenishment temperature. The arrows indicate the direction of water flow in the system. The dotted line indicates that the pipeline is not flowing, and the solid line indicates that the pipeline is flowing. Figure 6The specific process can be as follows: the first water supply switch valve M11 and the second water supply switch valve M21 are opened, and water is supplied in two ways, one way enters the first water supply pipeline, and the other way enters the second water supply pipeline; among them, the fifth circulating water pump G5 on the first precooling pipeline S71 is started and the first switch component is opened, and the water in the first water supply pipeline S11 passes through the first precooling pipeline S71, the second precooling pipeline S72 and the third precooling pipeline S73 and then supplies water to the cold storage tank 5. The second compressor 71 in the precooling and preheating module 7 is started and the circulating fan is started. The second heat exchanger 73 discharges heat through air circulation. After the refrigerant evaporates, the second compressor 71 works in a cycle and the reversing valve 72 is adjusted, so that the precooling and preheating module 7 precools the water entering the first heat exchanger 8, and supplies the precooled cold water into the second cold storage pipeline through the third precooling pipeline S73. S52, the first circulating water pump G1 delivers the pre-cooled cold water to the evaporator 4, the first compressor 1 starts and runs, the evaporator 4 circulates and cools the delivered cold water to the preset cold water temperature, and stores the cooled cold water in the cold storage tank 5 through the first cold storage pipe S51, and the cold water in the cold storage tank 5 is delivered to the cold place through the second circulating water pump G2 and the user's cooling pipe S31; at the same time, the water in the second water supply pipe S21 enters the heat storage tank 6 through the first preheating pipe S81 for water supply, and the hot water in the heat storage tank 6 is delivered to the condenser 2 through the third circulating water pump G3, and the condenser 2 circulates and heats the delivered hot water to the preset hot water temperature, and stores the hot water in the heat storage tank 6 through the first heat storage pipe S61, and the hot water in the heat storage tank 6 is delivered to the heating place through the fourth circulating water pump G4 and the user's heating pipe S41.

[0089] Specifically, in Figure 1 In the case where the first water supply pipeline S11 is connected to the cold water supply port of the cold storage tank 5 and the inlet of the fifth circulating water pump G5 through the first precooling pipeline S71, and the second water supply pipeline S21 is connected to the hot water supply port of the thermal storage tank 6 and the inlet of the sixth circulating water pump G6 through the first preheating pipeline S81, the heat pump energy storage system supplies cold water and hot water to the user. The specific steps of the operation control method also include:

[0090] If the water level in the cold storage tank is L C Less than or equal to the sum of the difference between the second preset cold water level L12 and the first water level, the water level L in the heat storage tank HIf the water temperature at the water supply main line S0 is lower than the preset water supply temperature, it means that the inlet water temperature is low and the energy on the hot side is insufficient. If the inlet water temperature is lower than the preset water supply temperature, it means that the inlet water temperature is low and the energy on the hot side is insufficient. It means that the water needs to be preheated when replenishing the heat storage tank 6. If the water temperature in the heat storage tank 6 changes during the replenishment process, the water entering the preheating circuit will be preheated after the hot water temperature reaches a certain level.

[0091] Next, the water temperature T9 at the inlet of the second cold source side of the condenser and the water temperature T11 at the hot water supply port of the thermal storage tank are obtained; based on the water temperature T9 at the inlet of the second cold source side of the condenser and the water temperature T11 at the hot water supply port of the thermal storage tank, it is determined whether the water added to the thermal storage tank 6 needs to be preheated;

[0092] Among them, if the water temperature T9 at the inlet of the second cold source side of the condenser is less than the difference between the preset hot water temperature and the fifth preset temperature difference, and the water temperature T11 at the hot water supply port of the heat storage tank is less than the difference between the second preset target water temperature at the second port of the second heat exchange channel of the first heat exchanger and the sixth preset temperature difference, it means that during the water replenishment process, the hot water in the heat storage tank 6 cannot be made to reach the preset hot water temperature by relying solely on the heat pump module, and the water replenished into the heat storage tank 6 needs to be preheated. Then the preheating and precooling module is controlled to start preheating the water in the second sub-circuit of the preheating circuit until the actual water temperature T10 at the second port of the second heat exchange channel is greater than or equal to the difference between the water temperature T11 at the hot water supply port of the heat storage tank and the seventh preset temperature difference. The preheating and precooling module 7 can be turned off to stop preheating, so that the heat pump energy storage system can supply cold water and hot water to the user while replenishing water. During this process, if the water level L in the cold storage tank is C When the water level in the heat storage tank is equal to the first preset cold water level L11, water replenishment to the cold storage tank 5 can be stopped. H When the water level reaches the first preset hot water level L21, water replenishment into the heat storage tank 6 can be stopped.

[0093] Among them, the above-mentioned fifth preset temperature difference can be 15°C, the sixth preset temperature difference can be 15°C, and the seventh preset temperature difference can be 5°C; the specific values ​​of the above-mentioned second preset target water temperature, the fifth preset temperature difference, the sixth preset temperature difference and the seventh preset temperature difference are not limited here and can be determined according to actual conditions.

[0094] like Figure 7The figure shows the state of the heat pump cold storage system supplying cooling and heating to users while replenishing water when the water temperature T5 at the main water replenishment line is lower than the preset water replenishment temperature. The arrows indicate the direction of water flow in the system. The dotted line indicates that the pipeline is not flowing, and the solid line indicates that the pipeline is flowing. The specific process is as follows: the first water replenishment switch valve M11 and the second water replenishment switch valve M21 are opened, and water is replenished in two ways, one way enters the first water replenishment pipeline S11, and the other way enters the second water replenishment pipeline S21; among them, the sixth circulation pump and the second switch component on the first preheating pipeline S81 are opened, and the water in the second water replenishment pipeline S21 passes through the first preheating pipeline S81, the second preheating pipeline S82 and the third preheating pipeline S83 and then enters the heat storage tank 6 for water replenishment, the second compressor 71 in the precooling and preheating module 7 is started, and the circulating fan 74 is started, and the second heat exchanger 73 absorbs heat through air circulation. After the refrigerant evaporates, the working cycle of the second compressor 71 and the reversing valve 72 are adjusted, so that the precooling preset module preheats the water entering the first heat exchanger 8, and replenishes the preheated hot water into the second heat storage pipeline through the third preheating pipeline S83 S62, the third circulating water pump G3 delivers the preheated hot water to the condenser 2, the first compressor 1 starts and runs, the condenser 2 circulates and heats the delivered hot water to the preset hot water temperature, and stores the heated hot water in the heat storage tank 6 through the first heat storage pipe S61, and the hot water in the heat storage tank 6 is delivered to the heat-using place through the fourth circulating water pump G4 and the user's heating pipe S41; at the same time, the water in the first water supply pipe S11 enters the cold storage tank 5 through the first pre-cooling pipe S71 for water replenishment, and the cold water in the cold storage tank 5 is delivered to the evaporator 4 through the first circulating water pump G1, and the evaporator 4 circulates and cools the delivered cold water to the preset cold water temperature, and stores the cold water in the cold storage tank 5 through the first cold storage pipe S51, and the cold water in the cold storage tank 5 is delivered to the cold-using place through the second circulating water pump G2 and the user's cooling pipe S31.

[0095] In the operation control method of the above-mentioned heat pump energy storage system, when a constant pressure water make-up device 9 is provided on the water make-up main line S0, the constant pressure water make-up device 9 is opened during water make-up. The constant pressure water make-up device 9 can stabilize the water make-up pressure. Opening the constant pressure water make-up device 9 during water make-up is beneficial to cold and heat storage.

[0096] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A heat pump energy storage system, characterized in that: include: Heat pump module, cold storage tank, heat storage tank, pre-cooling and pre-heating module and first heat exchanger; The heat pump module includes a first compressor, a condenser, a throttle valve, and an evaporator. The evaporator has a first cold source side and a first heat source side. The condenser has a second cold source side and a second heat source side. The first cold source side, the first compressor, the second heat source side, and the throttle valve are connected in sequence to form a heat pump circuit. The cold storage tank is connected to the first heat source side to form a cold storage circuit, the cold storage circuit has a first circulating water pump, the cold storage tank is also connected to the user's cold supply pipeline, the cold supply pipeline has a second circulating water pump, the cold storage tank is connected to the water supply main pipeline through a first water supply pipeline, and the first water supply pipeline has a first water supply on-off valve; The heat storage tank is connected to the second cold source side to form a heat storage circuit, the heat storage circuit is provided with a third circulating water pump, the heat storage tank is also connected to the user's heating pipeline, the heating pipeline is provided with a fourth circulating water pump, the heat storage tank is connected to the water supply main pipeline through a second water supply pipeline, and the second water supply pipeline is provided with a second water supply switch valve; The first heat exchanger has a first heat exchange side and a second heat exchange side. The first heat exchange side is connected to the cold storage tank to form a pre-cooling circuit. The pre-cooling circuit has a first switch component for controlling its own opening and closing state and a fifth circulating water pump. The first heat exchange side is connected to the heat storage tank to form a preheating circuit. The preheating circuit has a second switch component for controlling its own opening and closing state and a sixth circulating water pump. The precooling and preheating module is connected to the second heat exchange side to form a heat exchange circuit, which is used to precool the water in the precooling circuit and to preheat the water in the preheating circuit; The first water supply switch valve is an electric valve.

2. The heat pump energy storage system according to claim 1, characterized in that: The pre-cooling and preheating module includes a second compressor, a reversing valve, a second heat exchanger and a circulation fan. The second compressor, the second heat exchange side, the reversing valve and the second heat exchanger are connected in sequence to form the heat exchange circuit. The circulation fan is arranged opposite to the second heat exchanger.

3. The heat pump energy storage system according to claim 1, characterized in that: The cold storage tank has a cold storage inlet, a cold storage outlet, a cold supply outlet and a cold water replenishment inlet; The cold storage inlet is connected to the outlet of the first heat source side of the evaporator through a first cold storage pipeline, and the cold storage outlet is connected to the inlet of the first heat source side of the evaporator through a second cold storage pipeline, so that the cold storage tank and the first heat source side form a cold storage circuit, and the second cold storage pipeline is provided with the first circulating water pump, and the first circulating water pump is used to make the cold water in the cold storage circuit flow from the cold storage tank to the evaporator, the cold supply outlet is connected to the user's cold supply pipeline, and the cold water replenishment port is connected to the first replenishment pipeline.

4. The heat pump energy storage system according to claim 2, characterized in that: The heat storage tank has a heat storage inlet, a heat storage outlet, a heat supply outlet and a hot water supply inlet; The heat storage inlet is communicated with the outlet on the second cold source side of the condenser through a first heat storage pipeline, and the heat storage outlet is communicated with the inlet on the second cold source side of the condenser through a second heat storage pipeline, so that the heat storage pipe and the second cold source side form a heat storage circuit, and the second heat storage pipeline is provided with the third circulating water pump, and the third circulating water pump is used to make the hot water in the heat storage circuit flow from the heat storage tank to the condenser, the heat supply outlet is communicated with the user's heat supply pipeline, and the hot water replenishing port is communicated with the second water replenishing pipeline.

5. The heat pump energy storage system according to claim 4, characterized in that: The first heat exchange side of the first heat exchanger includes a first heat exchange channel and a second heat exchange channel capable of exchanging heat with the second heat exchange side; The first port of the first heat exchange channel is connected to the cold water replenishment port of the cold storage tank through a first pre-cooling pipeline, the second port of the first heat exchange channel is connected to the second port of the second heat exchange channel through a second pre-cooling pipeline, and the first port of the second heat exchange channel is connected to the cold storage outlet of the cold storage tank through a third pre-cooling pipeline, so that the first heat exchange side, the first heat source side and the cold storage tank are connected in sequence to form a pre-cooling circuit; Among them, the first pre-cooling pipeline is provided with the fifth circulating water pump and the first pre-cooling switch valve, the fifth circulating water pump is used to make the cold water in the pre-cooling circuit flow from the cold storage tank toward the first heat exchanger, the second pre-cooling switch valve is provided on the second pre-cooling pipeline, and the third pre-cooling switch valve is provided on the third pre-cooling pipeline. The first pre-cooling switch valve, the second pre-cooling switch valve and the third pre-cooling switch valve constitute the first switch assembly.

6. The heat pump energy storage system according to claim 5, characterized in that: The first pre-cooling switch valve is located between the outlet of the fifth circulating water pump and the first port of the first heat exchange channel, and the first water replenishment pipeline is connected to the cold water replenishment port of the cold storage tank and the inlet of the fifth circulating water pump through the first pre-cooling pipeline.

7. The heat pump energy storage system according to claim 5, characterized in that: The second port of the first heat exchange channel is connected to the hot water replenishment port of the thermal storage tank via a first preheating pipeline, the first port of the first heat exchange channel is connected to the first port of the second heat exchange channel via a second preheating pipeline, and the second port of the second heat exchange channel is connected to the heat storage outlet of the thermal storage tube via a third preheating pipeline, so that the first heat exchange side is connected to the thermal storage tank to form a preheating circuit. The preheating circuit includes a first sub-circuit formed by the mutual communication between the first heat exchange side and the thermal storage tank, and a second sub-circuit formed by the sequential communication between the first heat exchange side, the second cold source side, and the thermal storage tank. Among them, the first preheating pipeline is provided with a sixth circulating water pump and a first preheating switch valve, the fifth circulating water pump is used to make the hot water in the preheating circuit flow from the heat storage tank toward the first heat exchanger, the second preheating pipeline is provided with a second preheating switch valve, and the third preheating pipeline is provided with a third preheating switch valve. The first preheating switch valve, the second preheating switch valve and the third preheating switch valve constitute the second switch assembly.

8. The heat pump energy storage system according to claim 7, characterized in that: The first preheating switch valve is located between the outlet of the sixth circulating water pump and the second port of the first heat exchange channel, and the second water supply pipeline is connected to the hot water supply port of the heat storage tank and the inlet of the sixth circulating water pump respectively through the first preheating pipeline.

9. The heat pump energy storage system according to claim 1, characterized in that: A constant pressure water replenisher is provided on the main water replenishment line.

10. The heat pump energy storage system according to any one of claims 1 to 9, characterized in that: Also included are a temperature sensor assembly, a liquid level sensor assembly, and a control module; The temperature sensor assembly is used to detect the water temperature of the cold water at the water supply main line, the water temperature of the water in the precooling circuit before and after heat exchange with the precooling and preheating module, the water temperature of the water in the preheating circuit before and after heat exchange with the precooling and preheating module, the water temperature at the outlet and inlet of the first heat source side of the evaporator, the water temperature at the outlet and inlet of the second cold source side of the condenser, and the water temperature of the cold water in the cold storage tank and the hot water in the heat storage tank; The liquid level sensor assembly is used to detect the water level of cold water in the cold storage tank and hot water in the heat storage tank; The control module is signal-connected to the temperature sensor assembly, the liquid level sensor assembly, the first compressor in the heat pump module, the pre-cooling and preheating module, the first to sixth circulating water pumps, the first switch assembly, the second switch assembly, the first water replenishment switch valve, and the second water replenishment switch valve, and is used to control the status of the temperature sensor assembly, the liquid level sensor assembly, the heat pump module, the pre-cooling and preheating module, the first to sixth circulating water pumps, the first switch assembly, the second switch assembly, the first water replenishment switch valve, and the second water replenishment switch valve according to status information detected by the temperature sensor assembly and the liquid level sensor assembly.

11. An operation control method of a heat pump energy storage system, applying the heat pump energy storage system according to any one of claims 1 to 10, characterized in that: include: Obtain status information of the heat pump energy storage system; According to the status information, the states of the first compressor, the pre-cooling and preheating module, the first to sixth circulating water pumps, the first switch assembly, the second switch assembly, the first water replenishment switch valve and the second water replenishment switch valve in the heat pump module are controlled to switch the operating conditions of the heat pump energy storage system.

12. The operation control method according to claim 11, characterized in that: The status information includes the water temperature of the cold water at the water supply main line, the water temperature at the outlet and inlet of the first heat source side of the evaporator, the water temperature at the outlet and inlet of the second cold source side of the condenser, the water temperature before and after heat exchange of the water in the pre-cooling circuit, the water temperature before and after heat exchange of the water in the preheating circuit, and the water temperature and water level of the cold water in the cold storage tank and the hot water in the heat storage tank.

13. The operation control method according to claim 12, characterized in that: include: When the heat pump energy storage system starts to operate, the first compressor is controlled to shut down, and the first circulating water pump, the second circulating water pump, the fifth circulating water pump, the first switch component are closed, and the first water replenishment switch valve is opened, until the water level of the cold water in the cold storage tank is equal to the first preset cold water level. At the same time, the third circulating water pump is controlled to start, the fourth circulating water pump is shut down, the sixth circulating water pump is started, the second switch component is opened, and the second water replenishment switch valve is opened, until the water level in the thermal storage tank is greater than or equal to the first preset hot water level. At the same time, the pre-cooling and preheating module is controlled to start preheating until the hot water temperature in the thermal storage tank is equal to the sum of the cold water temperature in the cold storage tank and the first preset temperature difference, so as to realize the initial water replenishment working condition of the heat pump energy storage system.

14. The operation control method according to claim 13, characterized in that: After the initial water replenishment of the heat pump energy storage system is completed, it includes: Control the first water supply switch valve to close, the second water supply switch valve to close, the second circulating water pump to shut down, the fourth circulating water pump to shut down, the fifth circulating water pump to shut down, the sixth circulating water pump to shut down, the first switch component to close, the second switch component to open, the pre-cooling and preheating module to close, and control the first circulating water pump to start, the third circulating water pump to start, and the first compressor to start; Acquiring the water temperature at the outlet of the first heat source side of the evaporator and the water temperature at the outlet of the second cold source side of the condenser; If the water temperature at the outlet of the first heat source side of the evaporator is less than or equal to the preset cold water temperature and the water temperature at the outlet of the second cold source side of the condenser is less than or equal to the preset hot water temperature, the sixth circulating water pump is controlled to start and the precooling and preheating module is controlled to start to preheat the water in the preheating circuit until the water temperature at the outlet of the first heat source side of the evaporator is less than or equal to the first preset cold water temperature and the water temperature at the outlet of the second cold source side of the condenser is greater than or equal to the preset hot water temperature, so as to realize the cooling and heating working conditions of the heat pump energy storage system.

15. The operation control method according to claim 14, characterized in that: After the cooling and heating process of the heat pump energy storage system is completed, it includes: If the cold water temperature in the cold storage tank is equal to the preset cold water temperature and the water level in the cold storage tank is greater than the sum of the difference between the second preset cold water level and the first water level, controlling the second circulating water pump to start until the water level in the cold storage tank is less than or equal to the second preset cold water level and then shutting down to supply cold water to the user, wherein the sum of the difference between the second preset cold water level and the first water level is less than the first preset cold water level; If the hot water temperature in the thermal storage tank is equal to the preset hot water temperature and the water level in the thermal storage tank is greater than the sum of the difference between the second preset hot water level and the second water level, the fourth circulating water pump is controlled to start and is shut down after the water level in the thermal storage tank is less than or equal to the second preset hot water level, so as to supply hot water to the user, wherein the sum of the difference between the second preset hot water level and the second water level is less than the first preset hot water level.

16. The operation control method according to claim 15, characterized in that: When the first water supply pipeline is connected to the cold water supply port of the cold storage tank and the inlet of the fifth circulating water pump respectively through the first precooling pipeline, and the second water supply pipeline is connected to the hot water supply port of the thermal storage tank and the inlet of the sixth circulating water pump respectively through the first preheating pipeline, the heat pump energy storage system supplies cold water and hot water to the user, including: If the water level in the cold storage tank is less than or equal to the sum of the difference between the second preset cold water level and the first water level, the water level in the thermal storage tank is less than or equal to the sum of the difference between the second preset hot water level and the second water level, and the water temperature at the water supply main line is greater than the preset water supply temperature, the first water supply switch valve is opened, the second water supply switch valve is opened, the first switch assembly is opened, the second switch assembly is closed, the first to fifth circulating water pumps are started, and the sixth circulating water pump is shut down; Acquiring the water temperature at the inlet of the first heat source side of the evaporator and the water temperature at the cold water replenishment port of the cold storage tank; If the water temperature at the inlet of the first heat source side of the evaporator is greater than the difference between the preset cold water temperature and the second preset temperature difference, and the water temperature at the cold water replenishing port of the cold storage tank is greater than the difference between the first preset target water temperature at the first port of the second heat exchange channel of the first heat exchanger and the third preset temperature difference, the preheating and precooling module is controlled to start precooling the water in the precooling circuit until the actual water temperature at the first port of the second heat exchange channel is less than or equal to the difference between the water temperature at the cold water replenishing port of the cold storage tank and the fourth preset temperature difference, so that the heat pump energy storage system can supply cold water and hot water to users while replenishing water.

17. The operation control method according to claim 15, characterized in that: When the first water supply pipeline is connected to the cold water supply port of the cold storage tank and the inlet of the fifth circulating water pump respectively through the first precooling pipeline, and the second water supply pipeline is connected to the hot water supply port of the thermal storage tank and the inlet of the sixth circulating water pump respectively through the first preheating pipeline, the heat pump energy storage system supplies cold water and hot water to the user, including: If the water level in the cold storage tank is less than or equal to the sum of the difference between the second preset cold water level and the first water level, the water level in the thermal storage tank is less than or equal to the sum of the difference between the second preset hot water level and the second water level, and the water temperature at the water supply main line is less than the preset water supply temperature, the first water supply switch valve is opened, the second water supply switch valve is opened, the first switch assembly is closed, the second switch assembly is opened, the first to fourth circulating water pumps are started, the fifth circulating water pump is shut down, and the sixth circulating water pump is started; Obtaining the water temperature at the inlet of the second cold source side of the condenser and the water temperature at the hot water supply port of the thermal storage tank; If the water temperature at the inlet of the second cold source side of the condenser is lower than the difference between the preset hot water temperature and the fifth preset temperature difference, and the water temperature at the hot water supply port of the thermal storage tank is lower than the difference between the second preset target water temperature at the second port of the second heat exchange channel of the first heat exchanger and the sixth preset temperature difference, the preheating and precooling module is controlled to start preheating the water in the second sub-circuit of the preheating circuit until the actual water temperature at the second port of the second heat exchange channel is higher than or equal to the difference between the water temperature at the hot water supply port of the thermal storage tank and the seventh preset temperature difference, so that the heat pump energy storage system can supply cold water and hot water to users while also replenishing water.

18. The operation control method according to any one of claims 11 to 17, characterized in that: When a constant pressure water replenisher is provided on the water replenishment main line, the constant pressure water replenisher is opened during water replenishment.

Images