WO2020098057A1

WO2020098057A1 - Heat recovery system and defrosting control method

Info

Publication number: WO2020098057A1
Application number: PCT/CN2018/121907
Authority: WO
Inventors: 周冰; 武连发; 王大海; 郭建民; 张仕强
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-11-12
Filing date: 2018-12-19
Publication date: 2020-05-22
Also published as: CN109595856A; CN109595856B

Abstract

Disclosed are a heat recovery system and a defrosting control method. The heat recovery system comprises a first liquid pipe (3), a first gas pipe (2), and a generator (5), wherein the generator (5) comprises a second pipeline (9); the first liquid pipe (3) is connected to a first refrigerant flow path and a second refrigerant flow path; the first liquid pipe (3) and the second pipeline (9) are in communication with the first gas pipe (2) by means of the first refrigerant flow path and through a first valve assembly; and the first liquid pipe (3) is in communication with the first gas pipe (2) by means of the second refrigerant flow path and through a second valve assembly. Therefore, an appropriate defrosting mode can be selected to reduce, during defrosting, the risk of freezing in pipelines in a unit caused by a low-temperature refrigerant, thereby protecting the unit and improving the service performance of the unit.

Description

Heat recovery system and defrosting control method

Related application

This application requires the priority of the Chinese patent application with the application number 201811341656.4 and the application name of "a heat recovery system and defrosting control method", which was applied on November 12, 2018. The entire content of which is hereby incorporated by reference.

Technical field

This application relates to the field of generating units, and in particular, to a heat recovery system and a defrosting control method.

Background technique

At present, the principle of the hot water generator is to use the heat exchange between the refrigerant and water to make hot or cold water. When the system is defrosting, the temperature of the refrigerant pipe of the hot water generator is likely to be below zero, which will cause the system pipeline to freeze, which will eventually cause the pipeline to rupture and cause water to enter the system and damage the unit. To solve this problem, the defrosting can be controlled by detecting the water temperature. When there is no risk of freezing, the defrosting can be performed again, but when the water temperature is too low and the unit needs defrosting, it cannot be satisfied.

In view of the problem in the related art that when the generator inlet temperature is too low, defrosting is easy to damage the pipeline, and no effective solution has been proposed yet.

Summary of the invention

In view of this, the present application discloses a heat recovery system and a defrosting control method, which can solve the problem in the related art that when the inlet water temperature of the generator is too low, the pipeline is easily damaged by defrosting.

A heat recovery system includes: a first liquid pipe, a first gas pipe, and a generator, the generator includes a second pipeline,

The first liquid pipe is connected to the first refrigerant flow path and the second refrigerant flow path, and the first refrigerant flow path connects the first liquid pipe, the second pipeline and the first A gas pipe communicates, and the second refrigerant flow path communicates the first liquid pipe with the first gas pipe through a second valve assembly.

Preferably, the first valve assembly includes: a first electronic expansion valve, disposed on the second pipeline, and located on the refrigerant outlet side of the generator.

Preferably, the first valve assembly further includes: a cooling solenoid valve, which is disposed between the second pipeline and the first gas pipe.

Preferably, the second valve assembly includes a supercooling solenoid valve, which is disposed between the first liquid pipe and the first gas pipe.

Preferably, the system further includes: a third trachea, a heating solenoid valve,

The heating solenoid valve is provided between the third gas pipe and the second pipe.

Preferably, the system further includes: an electric heating device, the electric heating device being disposed on the water inlet pipeline of the generator.

A defrosting control method, the method is applied to the heat recovery system system, the method includes:

Detect the inlet water temperature of the system;

According to the inlet water temperature, it is determined that the refrigerant flow path of the system is the first refrigerant flow path or the second refrigerant flow path.

Preferably, determining that the refrigerant flow path of the system is the first refrigerant flow path or the second refrigerant flow path according to the inlet water temperature includes:

Determine whether the inlet water temperature is greater than a first preset threshold;

When the inlet water temperature is greater than the first preset threshold, determining that the refrigerant flow path of the system is the first refrigerant flow path;

When the inlet water temperature is less than or equal to the first preset threshold, it is determined that the refrigerant flow path of the system is the second refrigerant flow path.

Preferably, when the inlet water temperature is greater than a first preset threshold, determining that the refrigerant flow path of the system is the first refrigerant flow path includes:

Controlling the opening of the first valve assembly, the closing of the heating solenoid valve and the closing of the second valve assembly;

Wherein, the first valve assembly includes: a first electronic expansion valve provided on the second pipeline, the first electronic expansion valve is located on the refrigerant outlet side of the generator, and is provided on the second A refrigeration solenoid valve between the pipeline and the first gas pipe;

The second valve assembly includes: a supercooling solenoid valve disposed between the first liquid pipe and the first gas pipe,

The system further includes a third gas pipe, and the heating solenoid valve is disposed between the third gas pipe and the second pipeline.

Preferably, when the inlet water temperature is less than or equal to the first preset threshold, determining that the refrigerant flow path of the system is the second refrigerant flow path includes:

Control the cooling solenoid valve to close and the second valve assembly to open;

Wherein, the refrigeration solenoid valve is provided between the second pipeline and the first gas pipe, and the second valve assembly includes: a gas valve disposed between the first liquid pipe and the first gas pipe Cold solenoid valve.

When the inlet water temperature is less than or equal to the first preset threshold, it is further determined whether the inlet water temperature is less than the second preset threshold;

If not, it is determined that the refrigerant flow path of the system is the refrigerant flow path determined at the last defrosting.

Preferably, the method further includes:

If yes, it is further determined whether the electric heating device is turned on by the system, and if the electric heating device is not turned on by the system, determining that the refrigerant flow path of the system is the second refrigerant flow path;

Wherein, the second preset threshold is less than the first preset threshold; the electric heating device is provided on the water inlet pipeline of the generator.

Preferably, after determining whether the system turns on the electric heating device, the method further includes:

In the case where the system turns on the electric heating device, it is re-judged whether the inlet water temperature is greater than a first preset threshold.

Applying the technical solution of the present application, the heat recovery system includes: a first liquid pipe, a first gas pipe, and a generator, the generator includes a second pipeline, a first liquid pipe, and is connected to the first refrigerant flow path and the second refrigerant flow path, The first refrigerant flow path communicates the first liquid pipe and the second pipeline with the first gas pipe through the first valve assembly, and the second refrigerant flow path communicates the first liquid pipe with the first gas pipe through the second valve assembly. As a result, the second refrigerant flow path may not pass through the generator, which can reduce the risk of low-temperature refrigerant causing freezing of the pipeline in the unit during the defrosting process, thereby protecting the unit and improving the performance of the unit.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present application. For those of ordinary skill in the art, without paying any creative labor, other drawings can be obtained based on the published drawings.

FIG. 1 is a structural block diagram of a heat recovery system disclosed in an embodiment of the present application;

2 is a structural block diagram of a heat recovery system disclosed in an embodiment of the present application;

3 is a flowchart of a defrosting control method disclosed in an embodiment of the present application;

4 is a flowchart of a defrosting control method disclosed in an embodiment of the present application;

5 is a flowchart of a defrosting control method disclosed in an embodiment of the present application;

6 is a flowchart of a defrosting control method disclosed in an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

In the subsequent description, the use of suffixes such as "module", "part" or "unit" used to denote an element is only for the benefit of the description of the present application, and has no specific meaning in itself. Therefore, "modules", "components" or "units" can be mixedly used.

In order to solve the problem in the related art that when the temperature of the inlet water of the generator is too low, the pipeline is easily damaged by defrosting. As shown in FIG. 1, this application discloses a heat recovery system. The system includes:

The first liquid pipe 3, the first gas pipe 2, and the generator 5, the generator 5 includes a second pipeline 9,

The first liquid pipe 3 connects the first refrigerant flow path and the second refrigerant flow path. The first refrigerant flow path connects the first liquid pipe 3, the second pipeline 9 and the first gas pipe 2 through the first valve assembly. The refrigerant flow path connects the first liquid pipe 3 and the first gas pipe 2 through the second valve assembly.

Therefore, when the refrigerant flow path is the second refrigerant flow path, the refrigerant does not pass through the generator 5 (for example: a hot water generator), which can reduce the risk of freezing of the pipeline in the unit caused by low-temperature refrigerant during the defrosting process It can protect the unit and improve the performance of the unit.

It should be noted that, in the system shown in FIG. 1, when the refrigerant flow path is determined as the second refrigerant flow path, the refrigerant can pass through the first liquid pipe 3 and the first gas pipe 2, and obviously does not need to pass through the generator 5. It can achieve the purpose of protecting the unit and improving the performance of the unit.

In a possible implementation manner, the main controller may determine that the refrigerant flow path of the system is the first refrigerant flow path or the second refrigerant flow path according to the inlet water temperature. Specifically, when the inlet water temperature is greater than the first preset threshold, the refrigerant flow path of the system is determined to be the first refrigerant flow path; when the inlet water temperature is less than or equal to the first preset threshold, the refrigerant flow path of the system is determined to be the second Refrigerant flow path.

As shown in FIG. 1, the first refrigerant flow path realizes the communication between the first liquid pipe 3 and the second pipeline 9 and the first gas pipe 2 through the first valve assembly; the second refrigerant flow path realizes the first liquid through the second valve assembly The communication between the tube 3 and the first trachea 2. The first valve assembly includes a first electronic expansion valve 10, which is disposed on the second pipeline 9 and is located on the refrigerant outlet side of the generator 5. Understandably, the refrigerant in the second pipeline 9 is gaseous refrigerant (in the second pipeline 9 located above in FIG. 1) before flowing through the first electronic expansion valve 10, After 10, the gaseous refrigerant is converted into a liquid refrigerant (in the second pipe 9 located below in FIG. 1). The first valve assembly further includes: a cooling solenoid valve 7 disposed between the second pipeline 9 and the first gas pipe 2. The second valve assembly includes: a supercooling solenoid valve 4 disposed between the first liquid pipe 3 and the first gas pipe 2. The system further includes: a third gas pipe 1, a heating solenoid valve 6, and a heating solenoid valve 6, which are arranged between the third gas pipe 1 and the second pipeline 9.

The flow direction of the refrigerant in the above two cases is specifically described. In a possible implementation, the first refrigerant flow path is realized by: controlling the opening of the first electronic expansion valve 10, closing the heating solenoid valve 6, and cooling electromagnetic The valve 7 is opened and the supercooling solenoid valve 4 is closed; the second refrigerant flow path is realized by: controlling the supercooling solenoid valve 4 to be opened and the refrigeration solenoid valve 7 to be closed. When the cooling solenoid valve 7 is closed, referring to FIG. 1, it can be seen that the refrigerant cannot flow through the generator 5, and can only take the second refrigerant flow path, as long as the cooling solenoid valve 7 is closed and the supercooling solenoid valve 4 is opened, and heating The electromagnetic valve 6 and the first electronic expansion valve 10 may be in an open or closed state.

The generator 5 in the heat recovery system shown in FIG. 1 may be a hot water generator, but it is only used as an exemplary description. It can be understood that the generator shown in the present application is not limited to the hot water generator. In addition, FIG. 1 shows a mode converter 8. The mode converter 8 can be connected to an indoor unit and an outdoor unit. In the heat recovery system shown in FIG. 1, the pipeline of the outdoor unit passes through the mode converter 8. The number becomes two, that is, the second pipe 9 is led out from the first liquid pipe 3, and the third gas pipe 1 and the first gas pipe 2 are connected to the second pipe 9 respectively. Understandably, the mode converter 8 may not be provided.

FIG. 2 shows the connection relationship between the pipes of the outdoor unit and the pipes of the mode converter 8 and the generator 5. As shown in FIG. 2, when the system is in the cooling mode, the refrigerant is discharged from the exhaust port of the compressor 14 After flowing out, it passes through the four-way valve 18, the condenser 17, the heating solenoid valve 15, and the electronic expansion valve 22, and then enters the first gas pipe 2, and then passes through the cooling solenoid valve 7, the second pipeline 9, the first electronic expansion valve 10, After the second pipeline 9 (understandably, the first electronic expansion valve 10 is provided on the second pipeline 9), the first liquid pipe 3, and the electronic expansion valve 21, it returns to the compressor 14. When the system is in heating mode, the refrigerant flows out from the exhaust port of the compressor 14, passes through the four-way valve 19, the electronic expansion valve 20, enters the third gas pipe 1, and then passes through the heating solenoid valve 6, the second pipeline 9 After the first electronic expansion valve 10, the second pipeline 9, the first liquid pipe 3, and the electronic expansion valve 21, flow back to the compressor 14. Among them, a fan 16 is provided on the condenser side.

Among them, the first gas pipe 2 is a low-pressure gas pipe, which is a gas pipe through which refrigerant flows when the system is in a cooling state. The intake port of the first gas pipe 2 is connected to the exhaust port of the compressor 14, and the outlet port of the first gas pipe 2 is connected to the intake port of the compressor 14. The third gas pipe 1 is a high-pressure gas pipe, and is a gas pipe through which refrigerant flows when the system is in the heating state. The intake port of the third gas pipe 1 is connected to the exhaust port of the compressor 14, and the outlet port of the third gas pipe 1 is connected to the intake port of the compressor 14. The first liquid pipe 3 is a pipeline through which the refrigerant must flow when the system is in the cooling state or the heating state. The intake port of the first liquid pipe 3 is connected to the exhaust port of the compressor 14, and the exhaust port of the first liquid pipe 3 is connected to the intake port of the compressor 14.

In a possible implementation, as shown in FIGS. 1 and 2, the system further includes: an electric heating device 13 that is disposed on the water inlet pipe 11 of the generator 5. The water in the water inlet pipe 11 can be heated to change the temperature of the water inlet, thereby affecting the determination of the refrigerant flow path by the main controller. Among them, the generator 5 shown in FIG. 1 further includes a water inlet pipe 11 and a water outlet pipe 12, and an electric heating device 13 is provided on the water inlet pipe 11.

In a possible implementation manner, the system further includes: a heat recovery device (not shown in the figure). The heat recovery device includes: a high-pressure gas pipe, a low-pressure gas pipe, and a liquid pipe. The high-pressure gas pipe is connected to the third gas pipe 1; The first gas pipe 2 is connected; the liquid pipe is connected with the first liquid pipe 3, and the heat recovery device is used to recover the heat of the system. The hot water generator shown in Figure 1 of this application is two-control. The hot water generator can be used for cooling water or hot water. Heating and cooling needs. Among them, the heat storage device is equivalent to the heat recovery device, which can recover the excess heat in the flow of the refrigerant, avoid the waste of energy, and realize the effective use of energy. The heat recovery external machine has three controls, and the connection end of the mode converter and the heat recovery external machine has three controls, and the connection end with the hot water generator has two controls.

Therefore, when the main controller determines that the refrigerant flow path is the second refrigerant flow path, the refrigerant does not pass through the generator 5, which can reduce the risk of low-temperature refrigerant causing freezing of the pipelines in the unit during the defrosting process, and can protect the unit. Improve the performance of the unit.

FIG. 3 shows a defrosting control method disclosed in an embodiment of the present application. The method includes:

Step S101: Detect the inlet water temperature of the system;

Step S102: Determine the refrigerant flow path of the system as the first refrigerant flow path or the second refrigerant flow path according to the inlet water temperature.

Therefore, the defrosting method can be selected according to the level of the inlet water temperature to reduce the risk of freezing of the pipelines in the unit caused by low-temperature refrigerant during the defrosting process, which can protect the unit and improve the performance of the unit.

In a possible implementation manner, as shown in FIG. 4, step S102, determining that the refrigerant flow path of the system is the first refrigerant flow path or the second refrigerant flow path according to the inlet water temperature includes:

Step S1021: Determine whether the inlet water temperature is greater than the first preset threshold;

Step S1022: When the inlet water temperature is greater than the first preset threshold, determine that the refrigerant flow path of the system is the first refrigerant flow path;

Step S1023: When the inlet water temperature is less than or equal to the first preset threshold, determine that the refrigerant flow path of the system is the second refrigerant flow path.

Among them, the first preset threshold is equivalent to the preset water temperature safety value. When the water temperature is greater than the first preset threshold, it means that the water temperature at this time does not have the risk of freezing, and the normal defrosting process can be used, as shown in the system in FIG. For example, the corresponding solenoid valve in the control mode converter is switched to the cooling state, and at the same time, the first electronic expansion valve of the hot water generator is controlled to open a certain number of steps to make the refrigerant normally exchange heat through the hot water generator, so that the unit defrosts . When the inlet water temperature is less than or equal to the first preset threshold, it means that the unit may have a risk of icing, then determine the refrigerant flow path of the unit as the second refrigerant flow path, which can prevent the hot water generator from freezing Damage the unit.

In a possible implementation, when the inlet water temperature is greater than the first preset threshold, determining that the refrigerant flow path of the system is the first refrigerant flow path includes: controlling the opening of the first valve assembly, closing the heating solenoid valve, and the first The two valve assembly is closed. When the inlet water temperature is less than or equal to the first preset threshold, determining that the refrigerant flow path of the system is the second refrigerant flow path includes: controlling the closing of the cooling solenoid valve and the opening of the second valve assembly; wherein, the first valve assembly includes: the first electronic The expansion valve is provided on the second pipeline, on the refrigerant outlet side of the second pipeline, and a refrigeration solenoid valve disposed between the second pipeline and the first air pipe. The second valve assembly includes: a supercooling solenoid valve disposed between the first liquid pipe and the first gas pipe. The heating solenoid valve is arranged between the third gas pipe and the second pipe. As can be seen from FIG. 1, the refrigerant cannot flow through the generator and can only take the second refrigerant flow path, as long as the cooling solenoid valve is closed and the supercooling solenoid valve is open, and the heating solenoid valve and the first electronic expansion valve are open or It can be closed.

In a possible implementation, as shown in FIG. 5, step S1023, when the inlet water temperature is less than or equal to the first preset threshold, determining that the refrigerant flow path of the system is the second refrigerant flow path includes:

Step S301, when the inlet water temperature is less than or equal to the first preset threshold, it is further determined whether the inlet water temperature is less than the second preset threshold; if not, step S302 is performed; if yes, step S303 is performed;

Step S302, it is determined that the refrigerant flow path of the system is the refrigerant flow path determined during the last defrosting;

Step S303, it is further determined whether the system turns on the electric heating device, and if the system does not turn on the electric heating device, it is determined that the refrigerant flow path of the system is the second refrigerant flow path;

Wherein, the second preset threshold is less than the first preset threshold; the electric heating device is arranged on the water inlet pipeline of the generator.

Therefore, when the inlet water temperature is less than the second preset threshold (which can be understood as another preset water temperature safety threshold), it indicates that there may be a risk of freezing during the defrosting process. If the normal defrosting method (that is, the first refrigerant flow path) passing through the control mode converter to the cooling state is continued, the inlet temperature of the hot water generator will be further reduced. In order to avoid this situation, the embodiments of the present application provide two preferred solutions, that is, first determine whether the system is turned on for electric heating. When the system is turned on for electric heating, the inlet water temperature will gradually increase and the inlet water temperature can be re-determined Whether it is greater than the first preset threshold, and the refrigerant flow path is determined according to the inlet water temperature. If the system is not turned on for electric heating, the refrigerant flow path of the system can be directly determined as the second refrigerant path, and the supercooling solenoid valve can be controlled to open to a proper degree, the heating solenoid valve is closed, the cooling solenoid valve is closed, and the first electronic The expansion valve is closed (you can also control the supercooling solenoid valve to open to a proper opening, and only control the cooling solenoid valve to close), so that when the cold flow passes through the cold solenoid valve, it can exchange heat with the refrigerant in the first liquid pipe to make the first liquid The refrigerant in the tube is too cold. It can prevent the refrigerant from flowing to the hot water generator and avoid heat exchange with the water in the hot water generator. As a result, when the water temperature is low and there is a risk of freezing, another defrosting method is adopted to protect the unit while achieving the defrosting effect.

In a possible implementation, after determining whether the system turns on the electric heating device, the method further includes: re-determining whether the inlet water temperature is greater than the first preset threshold when the system turns on the electric heating device.

FIG. 6 shows a defrosting control method disclosed in an embodiment of the present application. The method includes:

Step S401, the unit enters the defrosting state;

Step S402: Detect the inlet water temperature of the hot water generator;

Step S403, judging that the inlet water temperature is> a? If yes, go to step S404; if no, go to step S405;

Step S404, the first control;

Among them, the first type of control corresponds to the first refrigerant path in the above implementation manner;

Step S405, the inlet water temperature <b? If yes, go to step S406; if no, go to step S407;

Step S406. Is there electric heating? If yes, go to step S408; if no, go to step S409;

Step S407: Control according to the last state;

Step S408, turn on the electric heating; then execute step S403;

Step S409, enter the second control;

Among them, the second control corresponds to the second refrigerant path in the above implementation.

Therefore, the defrosting method can be selected according to the level of the inlet water temperature to reduce the risk of freezing of the pipelines in the unit caused by low-temperature refrigerant during the defrosting process.

It should be noted that in this article, the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements It also includes other elements that are not explicitly listed, or include elements inherent to such processes, methods, objects, or devices. Without more restrictions, the element defined by the sentence "include one ..." does not exclude that there are other identical elements in the process, method, article or device that includes the element.

The sequence numbers of the above embodiments of the present application are for description only, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods in the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware, but in many cases the former is better Implementation. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence or part of contributions to the existing technology, and the computer software products are stored in a storage medium (such as ROM / RAM, magnetic disk, The CD-ROM includes several instructions to enable a mobile terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the drawings, but the present application is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only schematic, not limiting, and those of ordinary skill in the art Under the enlightenment of the application, many forms can be made without departing from the scope of the application and the scope of the claims, which are all covered by the protection of the application.

Claims

A heat recovery system is characterized by comprising: a first liquid pipe, a first gas pipe and a generator, the generator includes a second pipeline,

The first liquid pipe is connected to the first refrigerant flow path and the second refrigerant flow path, and the first refrigerant flow path connects the first liquid pipe, the second pipeline and the first A gas pipe communicates, and the second refrigerant flow path communicates the first liquid pipe with the first gas pipe through a second valve assembly.
The system of claim 1, wherein:

The first valve assembly includes: a first electronic expansion valve, disposed on the second pipeline, and located on the refrigerant outlet side of the generator.
The system of claim 2, wherein:

The first valve assembly further includes: a refrigeration solenoid valve disposed between the second pipeline and the first gas pipe.
The system of claim 1, wherein:

The second valve assembly includes a supercooling solenoid valve, which is disposed between the first liquid pipe and the first gas pipe.
The system according to claim 1, wherein the system further comprises: a third gas pipe, a heating solenoid valve,

The heating solenoid valve is provided between the third gas pipe and the second pipe.
The system according to claim 1, wherein the system further comprises: an electric heating device, the electric heating device being disposed on the water inlet pipeline of the generator.
A defrosting control method, characterized in that the method is applied to a system according to any one of claims 1 to 6, and the method includes:

Detect the inlet water temperature of the system;

According to the inlet water temperature, it is determined that the refrigerant flow path of the system is the first refrigerant flow path or the second refrigerant flow path.
The method according to claim 7, wherein determining whether the refrigerant flow path of the system is the first refrigerant flow path or the second refrigerant flow path according to the inlet water temperature includes:

Determine whether the inlet water temperature is greater than a first preset threshold;

When the inlet water temperature is greater than the first preset threshold, determining that the refrigerant flow path of the system is the first refrigerant flow path;

When the inlet water temperature is less than or equal to the first preset threshold, it is determined that the refrigerant flow path of the system is the second refrigerant flow path.
The method according to claim 8, wherein when the inlet water temperature is greater than a first preset threshold, determining that the refrigerant flow path of the system is the first refrigerant flow path includes:

Controlling the opening of the first valve assembly, the closing of the heating solenoid valve and the closing of the second valve assembly;

Wherein, the first valve assembly includes: a first electronic expansion valve provided on the second pipeline, the first electronic expansion valve is located on the refrigerant outlet side of the generator, and is provided on the second A refrigeration solenoid valve between the pipeline and the first gas pipe;

The second valve assembly includes: a supercooling solenoid valve disposed between the first liquid pipe and the first gas pipe,

The system further includes a third gas pipe, and the heating solenoid valve is disposed between the third gas pipe and the second pipeline.
The method according to claim 8, wherein, when the inlet water temperature is less than or equal to a first preset threshold, determining that the refrigerant flow path of the system is the second refrigerant flow path includes:

Control the cooling solenoid valve to close and the second valve assembly to open;

Wherein, the refrigeration solenoid valve is provided between the second pipeline and the first gas pipe;

The second valve assembly includes: a supercooling solenoid valve disposed between the first liquid pipe and the first gas pipe.
The method according to claim 8, wherein when the inlet water temperature is less than or equal to a first preset threshold, determining that the refrigerant flow path of the system is the second refrigerant flow path includes:

When the inlet water temperature is less than or equal to the first preset threshold, it is further determined whether the inlet water temperature is less than the second preset threshold;

If not, it is determined that the refrigerant flow path of the system is the refrigerant flow path determined at the last defrosting.
The method according to claim 11, wherein the method further comprises:

If yes, it is further determined whether the system turns on the electric heating device, and if the system does not turn on the electric heating device, determine the refrigerant flow path of the system as the second refrigerant flow path;

Wherein, the second preset threshold is less than the first preset threshold; the electric heating device is provided on the water inlet pipeline of the generator.
The method according to claim 12, wherein after determining whether the system turns on the electric heating device, the method further comprises:

In the case where the system turns on the electric heating device, it is re-judged whether the inlet water temperature is greater than a first preset threshold.
A computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, when the processor executes the program, any one of claims 7 to 13 The defrosting control method.
A storage medium containing computer-executable instructions, which when executed by a computer processor is used to perform the defrosting control method according to any one of claims 7 to 13.