Energy storage components and heat pump systems

Abstract

The present invention discloses an energy storage component and a heat pump system. The energy storage component comprises: an energy storage tank, which is provided with a liquid inlet and a liquid outlet; a first phase-change energy storage component, which is located in the energy storage tank; a second phase-change energy storage component, which is located in the energy storage tank; wherein the phase change temperature of the first phase-change energy storage component is higher than the phase change temperature of the second phase-change energy storage component. By configuring phase-change energy storage components with different phase-change temperatures in the energy storage tank, the energy storage requirements of cold and heat can be met, thereby reducing the energy consumption of the heat pump system.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to an energy storage component and a heat pump system. Background Art

[0002] At present, the heat pump system is usually equipped with a refrigeration circuit and a user heat exchange terminal, wherein the refrigeration circuit usually includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected together. The indoor heat exchanger is usually equipped with a refrigerant flow channel and a medium flow channel for heat exchange with each other. Chinese patent application No. 201510727615.9 discloses an energy storage air source heat pump heating system, which is equipped with a phase change accumulator to meet the demand for storing heat energy in winter. However, in the summer environment, the phase change accumulator cannot meet the requirements of cold storage, resulting in excessive cold waste in the heat pump system, which increases the overall energy consumption. How to design a heat pump system that can simultaneously meet the requirements of cold and heat storage to reduce energy consumption is a technical problem to be solved by the present invention. Summary of the invention

[0003] The present invention provides an energy storage component and a heat pump system, which realizes reducing the energy consumption of the heat pump system by configuring phase change energy storage components with different phase change temperatures in an energy storage tank to meet the energy storage requirements of cold and heat.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0005] An energy storage component, comprising:

[0006] An energy storage tank, wherein the energy storage tank is provided with a liquid inlet and a liquid outlet;

[0007] a first phase-change energy storage component, wherein the first phase-change energy storage component is located in the energy storage tank;

[0008] a second phase-change energy storage component, wherein the second phase-change energy storage component is located in the energy storage tank;

[0009] Wherein, the phase change temperature of the first phase change energy storage component is higher than the phase change temperature of the second phase change energy storage component.

[0010] Furthermore, a partition net is provided in the energy storage tank, and the partition net separates the energy storage tank into a first cavity and a second cavity arranged vertically; the first phase-change energy storage component is located in the first cavity, and the second phase-change energy storage component is located in the second cavity.

[0011] Furthermore, the phase change temperature of the first phase change energy storage component is 40°C to 50°C; the phase change temperature of the second phase change energy storage component is 7°C to 10°C.

[0012] Furthermore, the first phase-change energy storage component and the second phase-change energy storage component are capsule structures, and the capsule structures are filled with phase-change materials.

[0013] Furthermore, a flexible membrane is provided inside the energy storage tank, and the flexible membrane separates the interior of the energy storage tank into a buffer cavity and a solution cavity, and the liquid inlet and the liquid outlet are respectively connected to the solution cavity; the first phase change energy storage component and the second phase change energy storage component are located in the solution cavity.

[0014] Furthermore, the flexible film is located above the first phase-change energy storage component and the second phase-change energy storage component.

[0015] Furthermore, the energy storage tank is also provided with a switchable first air pumping nozzle, and the first air pumping nozzle is connected to the buffer cavity.

[0016] Furthermore, at least one flexible airbag is arranged in the energy storage tank.

[0017] Furthermore, the flexible airbag is connected to a switchable second air-inflating nozzle, and the second air-inflating nozzle extends outwardly to the outside of the energy storage tank.

[0018] The present invention also provides a heat pump system, including a refrigeration circuit and a user heat exchange terminal, the refrigeration circuit including a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger, the indoor heat exchanger is provided with a refrigerant flow channel and a medium flow channel for heat exchange with each other, the compressor, the outdoor heat exchanger, the throttling device and the refrigerant flow channel are connected in sequence, the user heat exchange terminal is connected to the medium flow channel, and also includes the above-mentioned energy storage component, the energy storage tank in the energy storage component is connected in series between the user heat exchange terminal and the medium flow channel.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are as follows: by configuring two phase-change energy storage components with different phase-change temperatures in the energy storage tank, in the winter heating mode, the first phase-change energy storage component is used to store heat, and during the operation of the refrigeration circuit, the first phase-change energy storage component can fully absorb heat for energy storage; and in the summer cooling mode, the second phase-change energy storage component is used to store cold, and during the operation of the refrigeration circuit, the second phase-change energy storage component can fully absorb cold for energy storage. In this way, the excess cold and heat generated by the refrigeration circuit can be absorbed by the corresponding phase-change energy storage component to reduce the operating energy consumption of the heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A schematic diagram of the structure of a heat pump system embodiment of the present invention;

[0022] Figure 2 This is one of the structural principle diagrams of the energy storage component in the heat pump system embodiment of the present invention;

[0023] Figure 3 This is the second structural principle diagram of the energy storage component in the heat pump system embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0025] like Figure 1-Figure 2 As shown, the heat pump system of this embodiment includes a refrigeration circuit 100 and a user heat exchange terminal 200. The refrigeration circuit 100 includes a compressor 101, an outdoor heat exchanger 102, a throttling device 103 and an indoor heat exchanger 104. The indoor heat exchanger 104 is provided with a refrigerant flow channel (not marked) and a medium flow channel (not marked) for heat exchange with each other. The compressor 101 is connected to the outdoor heat exchanger 102 and the refrigerant flow channel in sequence through a four-way valve 105. The throttling device 103 is connected between the outdoor heat exchanger 102 and the refrigerant flow channel, and the user heat exchange terminal 200 is connected to the medium flow channel. Among them, the performance entity of the user heat exchange terminal 200 can be a radiator or a fan coil, etc., and a circulation pump 201 is usually configured between the user heat exchange terminal 200 and the medium flow channel in order to accelerate the circulation of the heat exchange medium. In addition, the indoor heat exchanger 104 usually adopts a plate heat exchanger or a shell and tube heat exchanger. The above structural configuration is a configuration mode of a conventional heat pump system and will not be elaborated or limited here.

[0026] In order to store both cold and heat in cooling and heating modes, the heat pump system of this embodiment is also equipped with an energy storage component 300; the energy storage component 300 includes an energy storage tank 1 and a phase-change energy storage component 3, and the energy storage tank 1 is provided with a liquid inlet 11 and a liquid outlet 12; the phase-change energy storage component 3 includes a first phase-change energy storage component 31 and a second phase-change energy storage component 32, and the first phase-change energy storage component 31 and the second phase-change energy storage component 32 are both located in the energy storage tank 1. Among them, the phase change temperature of the first phase-change energy storage component 31 is higher than the phase change temperature of the second phase-change energy storage component 32. The energy storage tank 1 is connected in series between the user heat exchange terminal 200 and the medium flow channel through the liquid inlet 11 and the liquid outlet 12.

[0027] Specifically, the phase change energy storage component 3 is provided with a phase change material, which can play the role of energy storage. In winter heating mode, heat can be stored by the phase change material in the first phase change energy storage component 31; and in summer cooling mode, cold can be stored by the phase change material in the second phase change energy storage component 32. This solves the problem of partial waste of cold or heat due to imbalance in quantity and asynchronism in time on the cold and hot demand sides.

[0028] Among them, the first phase-change energy storage component 31 and the second phase-change energy storage component 32 can be mixed and installed in the energy storage tank 1. Preferably, by utilizing the different hot and cold specific gravities of the heat exchange medium, a partition net 15 can be further provided in the energy storage tank 1, and the partition net 15 divides the energy storage tank into a first cavity and a second cavity arranged up and down; the first phase-change energy storage component 31 is located in the first cavity, and the second phase-change energy storage component 32 is located in the second cavity. Specifically, in the heating mode, the hot heat exchange medium is located in the upper layer, and heat can be quickly absorbed through the first phase-change energy storage component 31; on the contrary, in the cooling mode, the cold heat exchange medium is located in the lower layer, and cold can be quickly absorbed through the second phase-change energy storage component 32.

[0029] Preferably, in view of actual cooling and heating requirements, the phase change temperature of the first phase change energy storage component 31 is 40°C to 50°C; the phase change temperature of the second phase change energy storage component 32 is 7°C to 10°C.

[0030] In addition, in order to avoid mutual interference between the phase change materials of the first phase change energy storage component 31 and the second phase change energy storage component 32 during the phase change process, the first phase change energy storage component 31 and the second phase change energy storage component 32 both adopt capsule structures filled with phase change materials.

[0031] More importantly, the energy storage tank 1 equipped with the phase-change energy storage component 3 plays different roles in different modes, as described in detail below.

[0032] In summer cooling mode:

[0033] After the user heat exchange terminal 200 receives the refrigeration operation instruction, the circulation pump 201 is started, and the user heat exchange terminal 200 begins to release cold energy to the room. The cold water at the outlet of the circulation pump 201 enters the user heat exchange terminal 200, cools the indoor air (for example, the user heat exchange terminal 200 uses a fan coil to blow cold air into the room to produce air conditioning refrigeration effect), and the temperature of the heat exchange medium rises, and then enters the indoor heat exchanger 104. If the return water temperature T of the indoor heat exchanger 104 is detected to be ≥13°C (the first temperature value), the refrigeration circuit 100 starts the refrigeration operation. The cold water from the indoor heat exchanger 104 enters the energy storage tank 1, cools and stores the phase change energy storage material inside the phase change energy storage component 3 to a certain extent, and then flows out of the energy storage tank 1 into the circulation pump 201, and then enters the user heat exchange terminal 200, and the cycle is repeated, thereby completing the refrigeration cycle of the indoor water system. During the operation of the refrigeration circuit 100, when T≤10℃ (the second temperature value), the refrigeration circuit 100 stops the refrigeration operation, and the circulation pump 201 continues to operate. During this process, the air conditioning coldness of the user heat exchange terminal 200 comes from the release of the cold storage in the phase change energy storage component 3 of the energy storage tank 1. Since the energy storage tank 1 has a certain amount of cold storage, it can provide coldness for the user heat exchange terminal 200 for a long time, which reduces the number of start-up and shutdown times of the refrigeration circuit 100, avoids the waste of electric energy caused by the frequent start-up and shutdown of the refrigeration circuit 100, and has a good energy-saving effect. When T≥13℃, the cold storage in the energy storage tank 1 has been released. At this time, the refrigeration circuit 100 starts the refrigeration operation, and provides coldness for the cold storage of the energy storage tank 1 and the air cooling of the user heat exchange terminal 200 at the same time, until T≤10℃, the above cycle starts again, and it repeats itself.

[0034] In winter heating mode:

[0035] After the user heat exchange terminal 200 receives the heating operation instruction, the circulation pump 201 is started and the user heat exchange terminal 200 starts to operate; the hot water at the outlet of the circulation pump 201 enters the user heat exchange terminal 200, heats the indoor air, and then the water temperature decreases, and then enters the indoor heat exchanger 104. If the return water temperature T≤39°C (the third temperature value) in the return water pipe 15 at the inlet of the indoor heat exchanger 104 is detected at this time, the refrigeration circuit 100 starts the heating operation. The heating hot water coming out of the indoor heat exchanger 104 enters the energy storage tank 1, and after the phase change energy storage material inside the phase change energy storage component 3 in the energy storage tank 1 is heated and stored to a certain extent, the hot water output from the energy storage tank 1 enters the circulation pump 201, and then enters the user heat exchange terminal 200 to heat the indoor air, and this cycle is repeated, thereby completing the heating cycle of the indoor water system. When T≥42℃ (the fourth temperature value), the refrigeration circuit 100 stops heating operation, and the circulation pump 201 continues to operate. In this process, the heating heat of the user heat exchange terminal 200 comes from the release of the heat stored in the phase change energy storage component 3 of the energy storage tank 1. Since the energy storage tank 1 has a certain amount of heat storage, it can provide heat for the user heat exchange terminal 200 for a long time, which reduces the number of start-up and shutdown times of the refrigeration circuit 100, avoids the waste of electric energy caused by the frequent start-up and shutdown of the refrigeration circuit 100, and has a good energy-saving effect. When T≤39℃, the heat storage in the energy storage tank 1 has been released. At this time, the refrigeration circuit 100 starts heating operation, and at the same time provides heat for the heat storage of the energy storage tank 1 and the air heating of the user heat exchange terminal 200, until T≥42℃, the above cycle starts again, and it repeats itself.

[0036] During the heating process, when the refrigeration circuit 100 receives a defrost command, the four-way valve 105 of the refrigeration circuit 100 is reversed, and the indoor heat exchanger 104 changes from a condenser under the heating condition to an evaporator under the defrost condition, and the outdoor heat exchanger 102 changes from an evaporator under the heating condition to a condenser under the defrost condition. At this time, the indoor circulation pump 201 continues to operate, and the phase change energy storage material in the phase change energy storage component 3 of the energy storage tank 1 changes from liquid to solid to release heat. The heat first heats the indoor air through the user heat exchange terminal 200, and then enters the indoor heat exchanger 104 through the water pipeline, causing the liquid refrigerant therein to evaporate and become gas, and then enters the compressor 101 through the refrigerant pipeline, and is compressed by the compressor 101 to become a high-temperature and high-pressure refrigerant exhaust gas and enter the outdoor heat exchanger 102, defrosting the outdoor heat exchanger 102. Therefore, the heat released in the energy storage tank 1 provides sufficient heat for defrosting the refrigeration circuit 100, and also provides heat for maintaining continuous heating of the user heat exchange terminal 200 during the defrosting process. This process can significantly reduce the defrosting time and maintain a high air outlet temperature of the user heat exchange terminal 200. During the defrosting process, the indoor temperature can be kept stable, and there will be no periodic fluctuations due to the drop in indoor temperature, which significantly improves the user experience, especially the comfort experience. After the defrosting is completed, the four-way valve 105 of the refrigeration circuit 100 is reversed again to restore the heating state, while providing heat for the heat storage of the energy storage tank 1 and the air heating of the user heat exchange terminal 200.

[0037] Based on the above technical solution, optionally, in order to reduce the impact of thermal expansion and contraction of the heat exchange medium on the indoor pipeline. Figure 2 As shown, the energy storage component 300 also includes a flexible membrane 2, which is arranged in the energy storage tank 1. The flexible membrane 2 divides the interior of the energy storage tank 1 into a buffer cavity and a solution cavity, and the liquid inlet 11 and the liquid outlet 12 are respectively connected to the solution cavity; the first phase change energy storage component 31 and the second phase change energy storage component 32 are located in the solution cavity. Specifically, during the actual operation of the heat pump system, the refrigerant in the refrigeration circuit 100 circulates, and the heat exchange medium circulates between the user heat exchange terminal 200 and the indoor heat exchanger 104. The heat exchange medium and the refrigerant exchange heat in the indoor heat exchanger 104. In the winter heating mode, the temperature of the heat exchange medium is relatively high, causing the heat exchange medium to expand in volume. After the heat exchange medium expands due to the temperature rise, the liquid pressure will be increased in the solution cavity of the energy storage tank 1, and the flexible membrane 2 will be deformed under the action of the liquid pressure to buffer the effect of the volume expansion of the heat exchange medium on the pipeline.

[0038] The flexible membrane 2 is located above the first phase-change energy storage component 31 and the second phase-change energy storage component 32. On the one hand, it can ensure that the heat exchange medium flows smoothly in the energy storage tank 1. The buffer medium flows below the flexible membrane 2. During the flow of the heat exchange medium, the flexible membrane 2 has little effect on the flowing heat exchange medium. At the same time, since the flexible membrane 2 does not need to carry the weight of the heat exchange medium, the life of the flexible membrane 2 is extended.

[0039] In addition, in order to facilitate the assembly of the flexible membrane 2 into the energy storage tank 1. The energy storage tank 1 includes: a tank body 13 and a tank cover 14, the tank body 13 is provided with a liquid inlet 11 and a liquid outlet 12; the tank cover 14 is detachably installed on the tank body 13; the buffer cavity is formed between the flexible membrane 2 and the tank cover 14, and correspondingly, a solution cavity is formed in the tank body 13. Specifically, in the actual assembly process, the assembly can be completed by clamping the flexible membrane 2 between the tank body 13 and the tank cover 14. In this case, the edge of the flexible membrane 2 is clamped between the tank cover 14 and the tank body 13, and the edge of the flexible membrane 2 is in contact with the tank cover 14 and the tank body 13 and sealed to form a solution cavity and a buffer cavity. Since the material of the flexible membrane 2 itself is elastic, after the flexible membrane 2 is clamped by the tank cover 14 and the tank body 13, the flexible membrane 2 can be used to seal the connection formed between the tank body 13 and the tank cover 14. In order to improve the sealing effect, a first outer flange (not marked) is provided on the upper edge of the tank body 13, and a second outer flange (not marked) is provided on the edge of the tank cover 14; the edge of the flexible membrane 2 is sandwiched between the first outer flange and the second outer flange. The first outer flange and the second outer flange cooperate to increase the contact area with the flexible membrane 2 to improve the sealing performance. Preferably, in order to facilitate the inflation of the buffer cavity during assembly, a switchable first air pumping nozzle 21 is also provided on the tank cover 14, and the first air pumping nozzle 21 is connected to the buffer cavity. Specifically, after the tank body 13, the tank cover 14 and the flexible membrane 2 are assembled, the buffer cavity can be inflated through the first air pumping nozzle 21 outside the energy storage tank 1. Similarly, in the later use process, the buffer cavity can also be supplemented with gas through the first air pumping nozzle 21 when the buffer cavity is deflated.

[0040] Similarly, if Figure 3As shown, a flexible airbag 2' can also be used to replace the above-mentioned flexible film. Specifically, the flexible airbag 2' is arranged in the energy storage tank 1. In the winter heating mode, the temperature of the heat exchange medium is relatively high, causing the heat exchange medium to expand in volume. After the heat exchange medium expands due to the temperature rise, the liquid pressure in the energy storage tank 1 will be increased, and the flexible airbag 2' will be deformed under the action of the liquid pressure to buffer the impact of the volume expansion of the heat exchange medium on the pipeline. In order to better achieve the buffering effect, a plurality of flexible airbags 2' can be arranged at the upper end of the energy storage tank 1. Specifically, a plurality of flexible airbags 2' cooperate with each other to obtain a better buffering effect. When the flexible airbag 2' is arranged at the upper end of the energy storage tank 1, the buffering medium mainly flows below the flexible airbag 2', and the flexible airbag 2' has little effect on the flowing heat exchange medium during the flow of the heat exchange medium. In addition, the flexible airbag 2' can be installed on the tank cover 14 or the tank body 13, taking the installation on the tank cover 14 as an example. The flexible airbag 2' is installed on the inner surface of the tank cover 14, for example, the flexible airbag 2' can be bonded to the tank cover 14 by gluing. Preferably, in order to facilitate the inflation of the flexible airbag 2' during assembly, a switchable second air pumping nozzle 21' is also provided on the tank cover 14, and the second air pumping nozzle 21' is connected to the flexible airbag 2'. Specifically, after the tank body 13, the tank cover 14 and the flexible airbag 2' are assembled, the flexible airbag 2' can be inflated through the second air pumping nozzle 21' outside the energy storage tank 1. Similarly, in the later use process, the flexible airbag 2' can also be supplemented with gas through the second air pumping nozzle 21' when the flexible airbag 2' is deflated.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a heat pump system, comprising a refrigeration circuit and a user heat exchange terminal, wherein the refrigeration circuit comprises a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger, wherein the indoor heat exchanger is provided with a refrigerant flow channel and a medium flow channel for heat exchange with each other, wherein the compressor, the outdoor heat exchanger, the throttling device and the refrigerant flow channel are connected in sequence, and the user heat exchange terminal is connected to the medium flow channel, It is characterized in that It also includes an energy storage component, which includes: An energy storage tank, wherein the energy storage tank is provided with a liquid inlet and a liquid outlet, and the energy storage tank is connected in series between the user heat exchange terminal and the medium flow channel; a first phase-change energy storage component, wherein the first phase-change energy storage component is located in the energy storage tank; a second phase-change energy storage component, wherein the second phase-change energy storage component is located in the energy storage tank; Wherein, the phase change temperature of the first phase change energy storage component is higher than the phase change temperature of the second phase change energy storage component; A partition net is also provided in the energy storage tank, and the partition net divides the energy storage tank into a first cavity and a second cavity arranged up and down; the first phase-change energy storage component is located in the first cavity, and the second phase-change energy storage component is located in the second cavity; In summer cooling mode: the circulation pump starts, the user heat exchange terminal starts to release cold energy to the room, the cold water at the outlet of the circulation pump enters the user heat exchange terminal, cools the indoor air, the temperature of the heat exchange medium rises, and then enters the indoor heat exchanger. If the return water temperature T of the indoor heat exchanger is detected to be ≥ the first temperature value at this time, the refrigeration circuit starts the refrigeration operation; the cold water coming out of the indoor heat exchanger enters the energy storage tank, cools and stores the phase change energy storage material inside the phase change energy storage component to a certain extent, then flows out of the energy storage tank into the circulation pump, and then enters the user heat exchange terminal, and the cycle is repeated, thereby completing the refrigeration cycle of the indoor water system; and during the operation of the refrigeration circuit, when T≤the second temperature value, the refrigeration circuit stops the refrigeration operation, and the circulation pump continues to operate. In this process, the air conditioning cold energy of the user heat exchange terminal comes from the release of the cold stored in the phase change energy storage component of the energy storage tank; the second temperature value is less than the first temperature value; In winter heating mode: the circulation pump starts, and the user heat exchange terminal starts to operate; the hot water at the outlet of the circulation pump enters the user heat exchange terminal, heats the indoor air, and then the water temperature drops, and then enters the indoor heat exchanger; if the return water temperature T in the return pipe at the inlet of the indoor heat exchanger is detected at this time ≤ the third temperature value, the refrigeration circuit starts heating operation; the heating hot water coming out of the indoor heat exchanger enters the energy storage tank, and after a certain heating and energy storage of the phase change energy storage material inside the phase change energy storage component in the energy storage tank, the hot water output from the energy storage tank enters the circulation pump, and then enters the user heat exchange terminal to heat the indoor air, and this cycle is repeated to complete the heating cycle of the indoor water system; when T ≥ the fourth temperature value, the refrigeration circuit stops heating operation, and the circulation pump continues to operate. In this process, the heating heat of the user heat exchange terminal comes from the release of heat stored in the phase change energy storage component of the energy storage tank; the third temperature value is less than the fourth temperature value; During the heating process, when the refrigeration circuit receives a defrost command, the four-way valve of the refrigeration circuit is reversed, and the indoor heat exchanger changes from a condenser under heating conditions to an evaporator under defrost conditions, while the outdoor heat exchanger changes from an evaporator under heating conditions to a condenser under defrost conditions; the indoor circulation pump continues to run, and the phase change energy storage material in the phase change energy storage component of the energy storage tank changes from liquid to solid to release heat. The heat first heats the indoor air through the user heat exchange terminal, and then enters the indoor heat exchanger through the water pipe, causing the liquid refrigerant in the indoor heat exchanger to evaporate and become gas, and then enters the compressor through the refrigerant pipeline, and is compressed by the compressor to become a high-temperature and high-pressure refrigerant and exhausted into the outdoor heat exchanger to defrost the outdoor heat exchanger.

2. The control method of the heat pump system according to claim 1, It is characterized in that The phase change temperature of the first phase change energy storage component is 40°C to 50°C; the phase change temperature of the second phase change energy storage component is 7°C to 10°C.

3. The control method of the heat pump system according to claim 1, It is characterized in that The first phase-change energy storage component and the second phase-change energy storage component are capsule structures, and the capsule structures are filled with phase-change materials.

4. A control method for a heat pump system according to any one of claims 1 to 3, It is characterized in that A flexible membrane is also provided in the energy storage tank, and the flexible membrane divides the interior of the energy storage tank into a buffer cavity and a solution cavity. The liquid inlet and the liquid outlet are respectively connected to the solution cavity; the first phase change energy storage component and the second phase change energy storage component are located in the solution cavity.

5. The control method of the heat pump system according to claim 4, It is characterized in that The flexible film is located above the first phase-change energy storage component and the second phase-change energy storage component.

6. The control method of the heat pump system according to claim 4, It is characterized in that The energy storage tank is also provided with a switchable first air pumping nozzle, and the first air pumping nozzle is connected to the buffer cavity.

7. The control method of the heat pump system according to any one of claims 1 to 3, It is characterized in that At least one flexible air bag is also arranged in the energy storage tank.

8. The control method of the heat pump system according to claim 7, It is characterized in that The flexible airbag is connected to a switchable second air-inflating nozzle, and the second air-inflating nozzle extends outwardly to the outside of the energy storage tank.

Images