Heat storage defrosting system and refrigeration equipment

Abstract

The utility model discloses a heat storage defrosting system and refrigeration equipment, the heat storage defrosting system comprises a refrigeration system with an evaporator and a heat storage loop used for providing heat for defrosting of the evaporator, the heat storage loop is provided with a first heat storage tank, a second heat storage tank, a heat collector and a heat release pipe, the heat collector is connected between an inlet of the first heat storage tank and an outlet of the second heat storage tank, the heat release pipe is connected between an outlet of the first heat storage tank and an inlet of the second heat storage tank, and a heat storage medium in the heat storage loop is driven by a heat storage power part to flow circularly. The two heat storage tanks are designed, heat storage media absorb heat through the heat collector and then are stored in the heat storage tanks, the heat release pipe is used for providing heat when the evaporator defrosts, the heat storage amount is higher, and stable supply of the heat can be kept in the defrosting period.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration defrosting technical field especially is related to heat storage defrosting system and refrigeration plant. BACKGROUND

[0002] As a key component of the refrigeration system, the surface of the evaporator is prone to form frost layer in low temperature environment, which not only reduces the heat exchange efficiency of the evaporator, but also may cause system performance degradation or even failure. Therefore, the effective defrosting technology of the evaporator is crucial to maintain the stable operation of the refrigeration system.

[0003] Currently, the main technical means of evaporator defrosting includes electric heating defrosting, heat recovery defrosting and heat storage defrosting, etc. Electric heating defrosting is to install an electric heating tube inside the evaporator, and use the heat generated by electric energy to heat the evaporator to achieve rapid defrosting. Its advantage is that the control logic is simple and direct, and the defrosting efficiency is high. However, the electric heating defrosting method has significant energy consumption problem, and the operation cost is high. In addition, it is easy to cause the temperature in the storage to fluctuate greatly during the defrosting process, which affects the quality and safety of the stored goods.

[0004] Heat recovery defrosting is to use the high-temperature refrigerant discharged by the compressor and not yet entering the condenser, and guide it to the evaporator for defrosting through the design of bypass pipeline or operation of four-way valve. Compared with electric heating defrosting, heat recovery defrosting has significantly improved energy utilization efficiency, but it still faces the challenge of large temperature fluctuation in the storage, which has adverse effects on the storage environment.

[0005] To overcome the shortcomings of the above two methods, heat storage defrosting technology emerges as the times require. Heat storage defrosting is to install a heat storage device on the basis of heat recovery defrosting method, store excess heat in the heat storage device, and release the heat when defrosting is needed. It not only shortens the defrosting time, but also improves the energy utilization efficiency. However, the existing heat storage defrosting technology usually only designs a single heat storage tank, which has limited heat storage capacity and slow temperature response speed, and it is difficult to fully meet various defrosting requirements.

[0006] Therefore, how to design a heat storage defrosting system and refrigeration plant with improved defrosting efficiency is a technical problem to be solved in the industry. INVENTION CONTENTS

[0007] In order to solve the above-mentioned defects of the existing defrosting scheme with low efficiency, the utility model provides a heat storage defrosting system and refrigeration plant, which is designed with two heat storage tanks. The heat storage medium absorbs heat after passing through the heat collector and is stored in the heat storage tank. When the evaporator is defrosted, the heat is provided by the heat releasing pipe. The heat storage capacity is higher and the stable supply of heat can be maintained during defrosting.

[0008] The utility model discloses a technical scheme that is, design heat storage defrosting system, include: having evaporimeter's refrigeration system and be used for providing heat to evaporimeter defrosting heat storage circuit, heat storage circuit has first heat storage jar, second heat storage jar, heat collector and heat releasing pipe, heat collector is connected between the import of first heat storage jar and the export of second heat storage jar, heat releasing pipe is connected between the export of first heat storage jar and the import of second heat storage jar, the heat storage medium in heat storage circuit circulates and flows through heat storage power piece drive.

[0009] Further, the heat storage circuit also has a heat storage pipe, the heat storage pipe is also connected between the outlet of the first heat storage tank and the inlet of the second heat storage tank, the heat releasing pipe is provided with a heat releasing valve, and the heat storage pipe is provided with a heat storage valve.

[0010] Further, the heat storage defrosting system further comprises an intermediate circuit for transferring heat between the evaporator and the heat releasing pipe, the intermediate circuit has a heat absorbing pipe for heat exchange with the heat releasing pipe and a heating pipe for heating the evaporator, and a heat exchange medium in the intermediate circuit circulates and flows through an intermediate power piece.

[0011] Further, the intermediate circuit further has a bypass pipe connected between the inlet and outlet of the heating pipe, and the bypass pipe is provided with a bypass valve.

[0012] Further, the inlet of the heating pipe is provided with a heating inlet valve, the outlet of the heating pipe is provided with a heating outlet valve, one end of the bypass pipe is connected upstream of the heating inlet valve, and the other end of the bypass pipe is connected downstream of the heating outlet valve.

[0013] Further, the heat storage medium is molten salt.

[0014] Further, the heat collector is a solar heat collector.

[0015] Further, the heat storage defrosting system further comprises a current sensor, a temperature sensor and a controller, the current sensor is used for detecting the current value of the evaporator fan, the temperature sensor is used for detecting the inlet and outlet temperature of the evaporator, and the current sensor and the temperature sensor are both in communication connection with the controller.

[0016] The utility model also proposes refrigeration equipment, refrigeration equipment includes above-mentioned heat storage defrosting system.

[0017] In some embodiments, the refrigeration equipment is a cold storage.

[0018] Compared with the prior art, the utility model at least has one of the following beneficial effects:

[0019] 1. The heat storage loop is designed with two heat storage tanks, the heat storage medium flowing out of the second heat storage tank absorbs heat through the heat collector and then enters the first heat storage tank, and the heat storage medium in the first heat storage tank flows back to the second heat storage tank, and the heat release pipe connected between the first heat storage tank and the second heat storage tank is used to supply heat to the evaporator to realize efficient defrosting.

[0020] 2. The heat storage pipe is designed between the first heat storage tank and the second heat storage tank, and when the evaporator does not require defrosting, the heat release pipe can be selected to be closed and the heat storage pipe can be selected to be opened for heat storage circulation, and the heat storage medium circulates between the second heat storage tank, the heat collector and the first heat storage tank, so that the heat storage amount is larger and the heat supply during defrosting is sufficient.

[0021] 3. The current sensor and the temperature sensor are designed, the current value of the evaporator fan and the inlet and outlet temperature of the evaporator are detected, and whether the evaporator is frosted is analyzed by using the current growth rate and the evaporator heat exchange amount, so that the accuracy of defrosting judgment is improved. DRAWINGS

[0022] The utility model will be described in detail below in combination with embodiments and drawings, wherein:

[0023] Figure 1 is the connection schematic diagram of the heat storage defrosting system of the utility model;

[0024] Figure 2 is the connection schematic diagram of the heat storage loop of the utility model;

[0025] Figure 3 is the flow direction schematic diagram of the heat storage loop of the utility model when the evaporator defrosts;

[0026] Figure 4 is the flow direction schematic diagram of the heat storage loop of the utility model when the heat storage;

[0027] Figure 5 is the connection schematic diagram of the intermediate loop of the utility model;

[0028] Figure 6 is the flow direction schematic diagram of the intermediate loop of the utility model when the evaporator defrosts;

[0029] DRAWINGS: 1, compressor; 2, condenser; 3, throttling element; 4, evaporator; 5, heating pipe; 6, first heat storage tank; 7, second heat storage tank; 8, heat collector; 9, heat collection pipe; 10, plate heat exchanger; 11, heat storage power element; 12, intermediate power element; 13, heating outlet valve; 14, heating inlet valve; 15, bypass valve; 16, heat release outlet valve; 17, heat storage valve; 18, heat release inlet valve; 19, temperature sensor; 20, heat release pipe; 21, heat storage pipe; 22, heat absorption pipe; 23, bypass pipe. DETAILED DESCRIPTION

[0030] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0031] The heat storage defrosting system proposed in this invention can be applied to refrigeration equipment, including but not limited to cold storage.

[0032] like Figure 1 As shown, specifically, the heat storage defrosting system includes a refrigeration system and a heat storage circuit. The refrigeration system has a compressor 1, a condenser 2, a throttling element 3, and an evaporator 4. In the refrigeration state, the refrigerant in the refrigeration system is discharged from the compressor 1 and flows through the condenser 2, the throttling element 3, and the evaporator 4 in sequence, and finally returns to the compressor 1. The flow of the refrigerant forms a closed refrigeration cycle. After the compressor 1 is turned on, the refrigerant circulates continuously to provide continuous cooling.

[0033] like Figure 2 As shown, the heat storage circuit includes a first heat storage tank 6, a second heat storage tank 7, a collector 8, and a heat release pipe 20. The first heat storage tank 6 serves as a high-temperature heat storage tank, and the second heat storage tank 7 serves as a low-temperature heat storage tank. The collector 8 is connected between the inlet of the first heat storage tank 6 and the outlet of the second heat storage tank 7 via a collector pipe 9. The heat release pipe 20 is connected between the outlet of the first heat storage tank 6 and the inlet of the second heat storage tank 7. The heat storage medium in the heat storage circuit is driven to circulate by the heat storage power component 11.

[0034] like Figure 3 As shown, when the evaporator 4 needs defrosting, the heat storage power component 11 is turned on, the heat release pipe 20 is connected, and the heat storage medium flowing out of the first heat storage tank 6 supplies heat to the evaporator 4 through the heat release pipe 20. The heat storage medium flowing out of the heat release pipe 20 then enters the second heat storage tank 7. The heat storage medium flowing out of the second heat storage tank 7 then absorbs the heat from the collector 8 through the collector pipe 9 and returns to the first heat storage tank 6. In this cycle, the heat release pipe 20 continuously supplies heat to the evaporator 4 to achieve efficient defrosting.

[0035] Since the heat storage medium flowing out of the heat release pipe 20 is first sent to the second heat storage tank 7, and then returned to the first heat storage tank 6 through the collector 8, the low temperature heat storage medium will not be directly sent back to the first heat storage tank 6 after being buffered by the second heat storage tank 7 and the collector 8, thus avoiding the temperature of the first heat storage tank 6 being pulled down rapidly, so as to maintain a stable supply of heat during defrosting and improve defrosting efficiency.

[0036] like Figure 2As shown, the heat storage circuit also includes a heat storage pipe 21, which is connected between the outlet of the first heat storage tank 6 and the inlet of the second heat storage tank 7. That is, the heat release pipe 20 and the heat storage pipe 21 are connected in parallel. The heat storage medium flowing out of the first heat storage tank 6 can be sent to the second heat storage tank 7 via the heat release pipe 20 or via the heat storage pipe 21. To facilitate adjustment of the flow direction of the heat storage medium, a heat release valve is installed on the heat release pipe 20, and a heat storage valve 17 is installed on the heat storage pipe 21. The heat release valve controls the on / off state of the heat release pipe 20, and the heat storage valve 17 controls the on / off state of the heat storage pipe 21.

[0037] In some feasible embodiments of this utility model, the inlet end of the heat-releasing pipe 20 is provided with a heat-releasing inlet valve 18, and the outlet end of the heat-releasing pipe 20 is provided with a heat-releasing outlet valve 16. When the evaporator 4 has no defrosting requirement, both the heat-releasing inlet valve 18 and the heat-releasing outlet valve 16 can be closed to prevent the heat storage medium from flowing into the heat-releasing pipe 20 and accumulating inside the heat-releasing pipe 20.

[0038] Generally, the heat dissipation pipe 20 is turned on when the evaporator 4 is defrosting. The heat from the heat storage medium flowing out of the first heat storage tank 6 is transferred out through the heat dissipation pipe 20 to supply the evaporator 4 for defrosting. The heat storage pipe 21 is turned on when the evaporator 4 is not defrosting. The heat storage medium flowing out of the first heat storage tank 6 is sent to the second heat storage tank 7 through the heat storage pipe 21. The heat storage medium flowing out of the second heat storage tank 7 is then sent to the collector 8 for heat absorption, and finally returns to the first heat storage tank 6.

[0039] like Figure 4 As shown, during the heat storage cycle in the heat storage circuit, the heat storage power component 11 is turned on, the heat storage pipe 21 is in the connected state, and the heat storage medium circulates between the second heat storage tank 7, the collector 8 and the first heat storage tank 6. If the collector 8 supplies heat normally, the temperature of both the first heat storage tank 6 and the second heat storage tank 7 will rise, and the temperature difference between the two heat storage tanks will gradually decrease until they are similar. The heat storage capacity of the entire heat storage circuit is greater, ensuring sufficient heat supply during defrosting.

[0040] like Figure 1 As shown, in some embodiments of this utility model, the heat storage defrosting system also includes an intermediate loop. The function of the intermediate loop is to transfer heat between the evaporator 4 and the heat dissipation pipe 20. The intermediate loop has a heat absorption pipe 22 and a heating pipe 5. After the heat exchange medium in the heat absorption pipe 22 absorbs heat, it flows to the heating pipe 5 to heat the evaporator 4. The heat exchange medium flowing out of the heating pipe 5 is then sent back into the heat absorption pipe 22 to absorb heat, forming a closed intermediate loop. The heat exchange medium in the intermediate loop is driven to circulate by the intermediate power component 12.

[0041] Specifically, such as Figure 5 , 6As shown, the function of the heat absorbing pipe 22 is to exchange heat with the heat releasing pipe 20, and the heat exchange medium flowing in the heat absorbing pipe 22 has a temperature rise after absorbing heat. In order to improve the heat exchange efficiency, a plate heat exchanger 10 can be designed between the intermediate circuit and the heat storage circuit. One set of heat exchange pipes (heat absorbing pipe 22) of the plate heat exchanger 10 is connected to the intermediate circuit, and the other set of heat exchange pipes (heat releasing pipe 20) of the plate heat exchanger is connected to the heat storage circuit, that is, the heat absorbing pipe 22 and the heat releasing pipe 20 exchange heat with each other in the plate heat exchanger 10. The heating pipe 5 is located near the evaporator 4, and is used to transfer the heat released by the heat exchange medium in the heat absorbing pipe 22 after temperature rise to the evaporator 4, so as to realize the defrosting function. In order to increase the effective area of the heating pipe 5, the heating pipe 5 can be designed as a heating coil to accelerate the defrosting speed.

[0042] The design of the intermediate circuit enables the heat storage defrosting system to adapt to different working conditions and defrosting requirements, and the performance of the system can be optimized by adjusting the driving speed of the intermediate power member 12 and the flow of the heat exchange medium. Moreover, the structure of the intermediate circuit is relatively simple, and is easy to maintain and overhaul. Once a fault occurs or maintenance is needed, the intermediate circuit can be conveniently disconnected for overhaul or replacement of parts.

[0043] On this basis, as shown in Figure 5 , 6 The intermediate circuit also has a bypass pipe 23, which is connected between the inlet and outlet of the heating pipe 5, and the bypass pipe 23 is provided with a bypass valve 15. That is, the bypass pipe 23 and the heating pipe 5 are arranged in parallel, and the heat exchange medium flowing out of the heat absorbing pipe 22 returns to the heat absorbing pipe 22 through the heating pipe 5 or the bypass pipe 23, and the opening degree of the bypass valve 15 can be adjusted to adjust the flow of the heating pipe 5. For example, by adjusting the opening degree of the bypass valve 15, the flow of the heat exchange medium flowing through the heating pipe 5 can be controlled. When it is needed to reduce the flow of the heating pipe 5, the opening degree of the bypass valve 15 can be increased, so that more heat exchange medium returns to the heat absorbing pipe 22 through the bypass pipe 23; on the contrary, when it is needed to increase the flow of the heating pipe 5, the opening degree of the bypass valve 15 can be reduced. For another example, in some working conditions (such as when the frost layer of the evaporator 4 is thin), a large amount of heat may not be needed for defrosting. At this time, by increasing the opening degree of the bypass valve 15, the heat load of the heating pipe 5 can be reduced, thereby reducing the energy consumption of the system.

[0044] In the preferred embodiment, the inlet of the heating pipe 5 is provided with a heating inlet valve 14 for controlling the flow of the heat exchange medium entering the heating pipe 5, the outlet of the heating pipe 5 is provided with a heating outlet valve 13 for controlling the flow of the heat exchange medium flowing out of the heating pipe 5, one end of the bypass pipe 23 is connected upstream of the heating inlet valve 14, and the other end of the bypass pipe 23 is connected downstream of the heating outlet valve 13.

[0045] In practical applications, the heating inlet valve 14, heating outlet valve 13, and bypass valve 15 typically work together to precisely regulate the flow rate of the heating tube 5. For example, when it is necessary to increase the flow rate of the heating tube 5, the opening of the bypass valve 15 can be decreased while the openings of the heating inlet valve 14 and heating outlet valve 13 are simultaneously increased; conversely, when it is necessary to decrease the flow rate of the heating tube 5, the opening of the bypass valve 15 can be increased while the openings of the heating inlet valve 14 and heating outlet valve 13 are appropriately decreased. This integrated regulation mechanism allows the system to flexibly adjust its operating state according to actual needs, thereby improving the system's energy efficiency and stability.

[0046] In a preferred embodiment of this invention, the heat storage medium is molten salt. Molten salt can absorb or release a large amount of heat during phase change, making it a highly efficient heat storage medium. During heat storage, the molten salt changes from a solid to a liquid state, absorbing heat; during heat release, the molten salt changes from a liquid to a solid state, releasing heat. Because molten salt has high thermal conductivity, density, and specific heat capacity, it has a high heat storage density, enabling it to store more heat within a limited volume. Furthermore, molten salts (such as binary mixed nitrates, low-melting-point mixed molten salts, etc.) have a wide liquid temperature range, meeting the heat storage requirements at different temperatures.

[0047] Based on the aforementioned heat storage circuit, in a preferred embodiment of this invention, the collector 8 is a solar collector. The solar collector can directly convert solar radiation energy into heat energy without undergoing a complex energy conversion process, thus exhibiting high energy conversion efficiency. Under sunlight, the solar collector can continuously absorb and convert solar energy into heat energy, providing a stable heat source for the heat storage circuit, reducing dependence on traditional energy sources, and combining stability with economic efficiency.

[0048] like Figure 1 As shown, for ease of understanding, an application example of this utility model is used for illustration. When there is no need for defrosting in the evaporator 4, the decision to activate the heat storage power unit 11 for heat storage circulation is analyzed based on the temperature difference between the two heat storage tanks, the molten salt temperature of the second heat storage tank 7, and the solar radiation value.

[0049] Specifically, when the solar irradiance reaches the preset start-up irradiance value, the temperature difference between the two heat storage tanks is higher than the preset temperature difference value, and the molten salt temperature of the second heat storage tank 7 is lower than the set start-up value, the heat storage power component 11 is turned on, and the heat storage circuit begins to store heat; when the solar irradiance does not reach the preset start-up irradiance value, or the temperature difference between the two heat storage tanks is less than the preset temperature difference value, or the molten salt temperature of the second heat storage tank 7 is higher than the set start-up value, the heat storage power component 11 is turned off, and the heat storage circuit stops storing heat.

[0050] In some feasible embodiments of this utility model, the heat storage defrosting system further includes: a current sensor, a temperature sensor 19, and a controller. The current sensor is used to detect the current value of the evaporator fan, and the temperature sensor 19 is used to detect the inlet and outlet temperatures of the evaporator 4. Both the current sensor and the temperature sensor 19 are communicatively connected to the controller. The controller receives the detection data from the current sensor and the temperature sensor 19, and analyzes whether the evaporator 4 is frosted based on the current growth rate and the heat exchange of the evaporator, thereby improving the accuracy of the defrosting judgment.

[0051] To facilitate understanding, an application example of this utility model will be used for illustration, which involves the current growth rate of the evaporator fan. The calculation method to determine whether evaporator 4 is frosted is as follows:

[0052]

[0053] Where I is the current detection value of the evaporator fan at the current moment, I0 is the initial current value of the evaporator fan during the detection period, and t is the detection time interval.

[0054] The evaporator fan current growth rate under normal operating conditions can be calculated by measuring the evaporator fan current when there is no frost. ,when If this occurs, it indicates increased evaporator fan resistance, and evaporator 4 may be frosting. In this case, it's necessary to determine whether frosting has occurred by considering the evaporator temperature and calculating the heat exchange between evaporator 4 and the environment during the testing period. Heat exchange with evaporator 4 under normal operating conditions In contrast, when When this occurs, it indicates that evaporator 4 is frosted, and both the intermediate circuit and the heat storage circuit are activated to provide heat to the evaporator for defrosting.

[0055] The heat exchange mentioned above The calculation method is as follows:

[0056]

[0057] Where K is the heat transfer coefficient of the evaporator, A is the heat exchange area of ​​the evaporator, and T is the outlet temperature of the evaporator. This refers to the inlet temperature of the evaporator.

[0058] This utility model also proposes a refrigeration device, which includes the above-mentioned heat storage defrosting system.

[0059] It should be understood that the power components mentioned in this article can be pumps, the valves can be solenoid valves, and the throttling elements can be electronic expansion valves. In actual applications, existing components can be selected according to specific needs, and this utility model does not impose any special restrictions on them.

[0060] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the term "comprising" and / or "including", when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof. The order of execution or performance of the operations involving devices, steps, or blocks in the apparatus and methods described herein need not be limited to the order presented in this specification unless a particular order is expressly described. Rather, the operations need not be performed in the order presented and that one, some or all of the operations can be performed concurrently, in parallel, or in any order. The terminology used herein can imply direct or indirect communication between devices or components, which can or can not be meant in a literally or commercially technical sense.

[0061] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, the techniques, methods, and apparatus should be considered part of the disclosure as appropriate. In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not limiting. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0062] The preferred embodiments of the present application have been disclosed herein and it is to be understood that other examples can be devised which do not differ from the essence of the application. Therefore, it is to be understood that the application is not to be limited to the specific examples disclosed and that modifications and / or substitutions are intended to be included as further embodiments of the present application. Thus, the scope of the application should be determined by the appropriate Carter of the appended claims and their legal equivalents rather than by the examples given.

Claims

1. A regenerative defrost system, comprising: The refrigeration system with an evaporator and a heat storage circuit for providing heat for defrosting the evaporator, characterized in that the heat storage circuit has a first heat storage tank, a second heat storage tank, a heat collector connected between an inlet of the first heat storage tank and an outlet of the second heat storage tank, and a heat releasing pipe connected between an outlet of the first heat storage tank and an inlet of the second heat storage tank, and a heat storage medium in the heat storage circuit is driven to circulate by a heat storage power element.

2. The thermal storage defrost system of claim 1, wherein, The heat storage circuit further has a heat storage pipe also connected between the outlet of the first heat storage tank and the inlet of the second heat storage tank, the heat releasing pipe is provided with a heat releasing valve, and the heat storage pipe is provided with a heat storage valve.

3. The thermal storage defrost system of claim 1, wherein, The heat storage defrosting system further comprises an intermediate circuit for transferring heat between the evaporator and the heat releasing pipe, the intermediate circuit has a heat absorbing pipe for heat exchange with the heat releasing pipe and a heating pipe for heating the evaporator, and a heat exchange medium in the intermediate circuit is driven to circulate by an intermediate power element.

4. The thermal storage defrost system of claim 3, wherein, The intermediate circuit further has a bypass pipe connected between an inlet and an outlet of the heating pipe, and the bypass pipe is provided with a bypass valve.

5. The thermal storage defrost system of claim 4, wherein, The inlet of the heating pipe is provided with a heating inlet valve, the outlet of the heating pipe is provided with a heating outlet valve, one end of the bypass pipe is connected upstream of the heating inlet valve, and the other end of the bypass pipe is connected downstream of the heating outlet valve.

6. The thermal storage defrost system of claim 1, wherein, The heat storage medium is a molten salt.

7. The thermal storage defrost system of claim 1, wherein, The heat collector is a solar heat collector.

8. The thermal storage defrost system of any of claims 1-7, wherein, The heat storage defrosting system further comprises a current sensor for detecting a current value of an evaporator fan, a temperature sensor for detecting an inlet and outlet temperature of the evaporator, and a controller, and the current sensor and the temperature sensor are in communication connection with the controller.

9. A refrigeration appliance characterised in that, The refrigeration equipment comprises the heat storage defrosting system according to any one of claims 1 to 8.

10. The refrigeration appliance of claim 9, wherein, The refrigeration equipment is a cold storage. The refrigeration equipment is a cold storage.

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