Refrigeration energy storage equipment and system, refrigeration energy storage method and storage medium

Abstract

The invention relates to refrigeration energy storage equipment and system, a refrigeration energy storage method and a storage medium. The refrigeration energy storage equipment comprises an energy storage device, a refrigeration device, a heat exchange device and a control device, a first circulating loop is arranged between the refrigerating device and the energy storage device, and a first circulating pump is arranged on the first circulating loop; a second circulating loop is arranged between the energy storage device and the heat exchange device, and a second circulating pump is arranged on the second circulating loop; the control device is electrically connected with the energy storage device, the refrigerating device, the heat exchange device, the first circulating pump and the second circulating pump. The technical problems that an existing energy storage technology is low in efficiency, high in cost and narrow in application range, and it is difficult to effectively utilize low-price electricity to store energy to meet the high-price electricity period requirement are solved.

Description

Technical Field

[0001] The present application relates to the technical fields of energy storage and refrigeration, and particularly to a refrigeration energy storage device and system, a refrigeration energy storage method, and a storage medium. Background Art

[0002] Currently, with the continuous increase in energy costs and the pursuit of efficient energy utilization, the peak-valley electricity price policy has been widely implemented. Against this background, how to effectively utilize low-cost electricity at night for energy storage to meet the energy demand during high-price electricity periods during the day has become an urgent problem to be solved. Traditional refrigeration methods have high operating costs during high-price electricity periods during the day, while existing energy storage technologies have defects such as low energy storage efficiency, high cost, and narrow application range. Summary of the Invention

[0003] The present application provides a refrigeration energy storage device and system, a refrigeration energy storage method, and a storage medium to solve the technical problems of low efficiency, high cost, and narrow application range of existing energy storage technologies, and it is difficult to effectively utilize low-cost electricity for energy storage to meet the demand during high-price electricity periods.

[0004] In a first aspect, the present application provides a refrigeration energy storage device, including an energy storage device, a refrigeration device, a heat exchange device, and a control device; a first circulation loop is provided between the refrigeration device and the energy storage device, and a first circulation pump is provided on the first circulation loop; a second circulation loop is provided between the energy storage device and the heat exchange device, and a second circulation pump is provided on the second circulation loop; the control device is electrically connected to the energy storage device, the refrigeration device, the heat exchange device, the first circulation pump, and the second circulation pump.

[0005] As an optional example, the antifreeze in the energy storage device flows to the refrigeration device through the first circulation loop and flows back to the energy storage device through the first circulation loop.

[0006] As an optional example, the low-temperature antifreeze in the energy storage device flows to the heat exchange device through the second circulation loop and flows back to the energy storage device through the second circulation loop.

[0007] As an optional example, the energy storage device includes a heat-insulated liquid storage tank, and the heat-insulated liquid storage tank is made of double-layer stainless steel material.

[0008] As an optional example, a heat-insulating layer is filled in the heat-insulated liquid storage tank, and the heat-insulating layer is made of polyurethane foam material with a thickness of 50 mm to 100 mm.

[0009] As an optional example, a stirrer is provided in the heat-insulated liquid storage tank.

[0010] As an alternative example, a liquid level sensor and an automatic liquid replenisher are provided inside the above-mentioned heat-insulated liquid storage tank, and both the above-mentioned liquid level sensor and the above-mentioned automatic liquid replenisher are electrically connected to the above-mentioned control device.

[0011] As an alternative example, a temperature sensor is provided inside the above-mentioned heat-insulated liquid storage tank, and the above-mentioned temperature sensor is electrically connected to the above-mentioned control device.

[0012] As an alternative example, the above-mentioned heat exchange device includes at least one heat exchanger.

[0013] In a second aspect, the present application provides a refrigeration energy storage system, including the above-mentioned refrigeration energy storage device.

[0014] In a third aspect, the present application provides a refrigeration energy storage method, including: obtaining the temperature of the antifreeze in the energy storage device, and starting the first circulation pump and the refrigeration device when the above-mentioned temperature is greater than the first threshold, or when the above-mentioned temperature is greater than the second threshold and the current time point is in a low electricity price period, so as to open the first circulation loop. The antifreeze in the above-mentioned energy storage device flows through the above-mentioned first circulation loop to the above-mentioned refrigeration device, and the above-mentioned refrigeration device cools the above-mentioned antifreeze, and after the cooling is completed, the above-mentioned antifreeze flows back to the above-mentioned energy storage device through the above-mentioned first circulation loop, where the above-mentioned first threshold is greater than the above-mentioned second threshold; when it is detected that the target load needs to be cooled, start the second circulation pump to open the second circulation loop. The antifreeze in the above-mentioned energy storage device flows through the above-mentioned second circulation loop to the heat exchange device, and the above-mentioned heat exchange device cools the above-mentioned target load through the above-mentioned antifreeze, and after the cooling is completed, the above-mentioned antifreeze flows back to the above-mentioned energy storage device through the above-mentioned second circulation loop.

[0015] As an alternative example, after starting the first circulation pump, the above-mentioned method further includes: when the current time point is in the above-mentioned low electricity price period and the above-mentioned temperature is less than the third threshold, closing the above-mentioned first circulation pump and the above-mentioned refrigeration device to close the first circulation loop, where the above-mentioned third threshold is less than the above-mentioned second threshold.

[0016] As an alternative example, after starting the first circulation pump, the above-mentioned method further includes: when the current time point is in a high electricity price period and the above-mentioned temperature is lower than the fourth threshold, closing the above-mentioned first circulation pump and the above-mentioned refrigeration device to close the first circulation loop, where the above-mentioned fourth threshold is less than the above-mentioned second threshold and greater than the third threshold.

[0017] As an alternative example, the above-mentioned method further includes: obtaining the liquid level of the antifreeze in the above-mentioned energy storage device; when the above-mentioned liquid level is lower than the fifth threshold, starting the automatic liquid replenisher to replenish the antifreeze into the above-mentioned energy storage device.

[0018] Fourthly, the present application provides a storage medium storing a computer program, wherein the computer program, when run by a processor, executes the above-mentioned refrigeration energy storage method.

[0019] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0020] The present application adopts a refrigeration energy storage device including an energy storage device, a refrigeration device, a heat exchange device, and a control device; a first circulation loop is provided between the refrigeration device and the energy storage device, and a first circulation pump is provided on the first circulation loop; a second circulation loop is provided between the energy storage device and the heat exchange device, and a second circulation pump is provided on the second circulation loop; the control device is electrically connected to the energy storage device, the refrigeration device, the heat exchange device, the first circulation pump, and the second circulation pump. In the above refrigeration energy storage device, the energy storage device stores the low-temperature antifreeze produced by the refrigeration device and the high-temperature antifreeze produced by the heat exchange device to realize the temporary storage of cold energy. The heat exchange device transfers the cold energy in the energy storage device to the actual load to realize the release of cold quantity. The antifreeze after absorbing heat flows back to the liquid storage tank to complete the recycling of cold quantity. The control device monitors the temperature, liquid level of the antifreeze in the energy storage device, and the operating states of devices such as the refrigeration device and the circulation pump in real time, and automatically controls the start and stop of the refrigeration device and the flow regulation of the circulation pump according to the set temperature threshold and time program to realize the intelligent operation of the system. Thus, it realizes refrigeration at low electricity prices at night, releases cold quantity during the day for load use, reduces the overall operation cost, improves the cold quantity transmission efficiency, and reduces the energy loss, thereby solving the technical problems of low efficiency, high cost, narrow application range of the existing energy storage technology, and difficulty in effectively using low-price electricity for energy storage to meet the demand during high-price electricity periods. Description of the Drawings

[0021] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] One or more embodiments are illustrated by way of example in the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a scale limitation.

[0024] Figure 1It is a schematic structural diagram of an optional refrigeration energy storage device according to an embodiment of the present application;

[0025] Figure 2 It is a flowchart of an optional refrigeration energy storage method according to an embodiment of the present application. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0027] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0028] According to the first aspect of the embodiments of the present application, a refrigeration energy storage device is provided. Optionally, as Figure 1 shown, the above-mentioned refrigeration energy storage device includes:

[0029] An energy storage device 102, a refrigeration device 104, a heat exchange device 106, and a control device 108;

[0030] A first circulation loop is provided between the refrigeration device 104 and the energy storage device 102, and a first circulation pump 110 is provided on the first circulation loop;

[0031] A second circulation loop is provided between the energy storage device 102 and the heat exchange device 106, and a second circulation pump 112 is provided on the second circulation loop;

[0032] The control device 108 is electrically connected to the energy storage device 102, the refrigeration device 104, the heat exchange device 106, the first circulation pump 110, and the second circulation pump 112.

[0033] As an optional example, the antifreeze in the energy storage device flows to the refrigeration device through the first circulation loop and flows back to the energy storage device through the first circulation loop.

[0034] As an optional example, the antifreeze in the energy storage device flows to the heat exchange device through the second circulation loop and flows back to the energy storage device through the second circulation loop.

[0035] Optionally, in this embodiment, the refrigeration energy storage device is a system device that combines cold energy storage and reuse, aiming to achieve the conversion and utilization of electric energy at different times. It is composed of an energy storage device, a refrigeration device, a heat exchange device, and a control device. The energy storage device is used to store the low-temperature antifreeze produced by the refrigeration device and the high-temperature antifreeze produced by the heat exchange device, realizing the temporary storage of cold energy. The refrigeration device is responsible for operating during the low electricity price period at night. Using the compression refrigeration principle, it can use environmentally friendly refrigerants such as R410A (azeotropic mixture mainly composed of difluoromethane and pentafluoroethane in a certain proportion) as the working medium. Through a series of processes such as compression, condensation, throttling, and evaporation of the refrigerant by the compressor, the antifreeze is cooled to -25°C to -30°C. The heat exchange device is used to transfer the cold energy in the energy storage device to the actual load (fermentation tank or heat exchanger, such as the fan coil heat exchanger used in the indoor air conditioning system) when cooling is required during the day, realizing the release of cold energy. In the heat exchange device, the low-temperature antifreeze exchanges heat with indoor air or circulating water, and the antifreeze after absorbing heat flows back to the liquid storage tank to complete the recycling of cold energy. The control device is used for intelligent control, electrically connected to the core components of the entire device (energy storage device, refrigeration device, heat exchange device, two sets of circulation pumps), and uses a programmable logic controller to monitor the temperature, liquid level of the antifreeze in the energy storage device, and the operating states of devices such as the refrigeration device and the circulation pump in real time. According to the set temperature threshold and time program, it automatically controls the start and stop of the refrigeration device and the flow regulation of the circulation pump to realize the intelligent operation of the system. The first circulation loop and the first circulation pump form a closed circulation path between the refrigeration device and the energy storage device. Through the first circulation pump, the low-temperature antifreeze generated by the refrigeration device is transported to the energy storage device for cold energy storage, and the high-temperature antifreeze after absorbing heat in the energy storage device returns to the refrigeration device for cooling treatment. The second circulation loop and the second circulation pump form a closed circulation path between the energy storage device and the heat exchange device. Through the second circulation pump, the low-temperature antifreeze in the energy storage device flows to the heat exchange device to cool the target load; the high-temperature antifreeze after absorbing heat returns to the energy storage device and waits for the next round of refrigeration.

[0036] Optionally, in this embodiment, the operation process of the refrigeration energy storage device is as follows: During the low electricity price period at night, the control device starts the refrigeration device and the first circulation pump, generates low-temperature antifreeze liquid, and transports it to the energy storage device through the first circulation loop to complete the cold energy storage. During the high electricity price period during the day, the refrigeration device stops operating, and the control device starts the second circulation pump, causing the low-temperature antifreeze liquid in the energy storage device to flow to the heat exchange device to supply cooling for the actual load, and the high-temperature antifreeze liquid after use flows back to the energy storage device. The control device can intelligently control the opening or closing of each device according to time, electricity price, ambient temperature, and load conditions to achieve energy-saving operation. When the temperature of the antifreeze liquid in the energy storage device rises to the set upper limit, if it is the low electricity price period at night, the control device starts the refrigeration device to refrigerate again; if it is the high electricity price period during the day, the control device, according to the preset strategy, preferentially utilizes the remaining cold energy, and when it is insufficient, it judges whether to start the refrigeration device to supplement the cold energy according to the cost. By taking advantage of the peak-valley electricity price difference, refrigeration energy is stored at low electricity prices at night, and the operation time of the refrigeration device during the high electricity price period during the day is reduced, greatly reducing the electricity cost. The high specific heat capacity of the antifreeze liquid enables it to store a large amount of cold energy, and the energy storage device ensures the stable storage and efficient utilization of cold energy. The refrigeration energy storage device can operate stably, is not affected by the power supply fluctuations during the day, and can be widely applied to various places such as commercial buildings, industrial factories, and data centers that have requirements for refrigeration stability and cost control.

[0037] Optionally, in this embodiment, the refrigeration energy storage device uses low electricity prices at night for refrigeration and releases cold energy for load use during the day, effectively responding to the peak-valley electricity price policy and reducing the overall operation cost. The dual-loop system of the refrigeration energy storage device optimizes the refrigeration and cooling paths respectively, improves the cold energy transmission efficiency, and reduces energy loss. The refrigeration energy storage device intelligently schedules the operation of the device through the control device, adapts to various working conditions and load requirements, and is applicable to multiple scenarios such as commercial buildings and industrial cooling. The refrigeration energy storage device does not need to start the refrigeration equipment during the day, reduces the equipment operation time and maintenance cost, and extends the service life of the equipment. The circulation pumps of the refrigeration energy storage device work independently, operate stably in sections, and avoid the efficiency reduction caused by the mixing of hot and cold liquids.

[0038] As an optional example, the energy storage device includes a heat-insulated liquid storage tank, and the heat-insulated liquid storage tank is composed of double-layer stainless steel material.

[0039] Optionally, in this embodiment, the core component of the energy storage device is a heat-insulated liquid storage tank, which is used to store low-temperature antifreeze liquid (such as chilled water, ethylene glycol solution, etc.) provided by the refrigeration device to achieve the storage and subsequent release of cold energy. The heat-insulated liquid storage tank is composed of double-layer stainless steel material. The inner-layer stainless steel is in direct contact with the antifreeze liquid, has good corrosion resistance and strength, ensures that there will be no leakage or corrosion during long-term use, and the outer-layer stainless steel enhances the stability of the overall structure and provides additional physical protection.

[0040] As an alternative example, the heat-insulated liquid storage tank is filled with a heat-insulating layer, which is made of polyurethane foam material and has a thickness of 50 to 100 millimeters.

[0041] Optionally, in this embodiment, the heat-insulated liquid storage tank is filled with a heat-insulating layer. The heat-insulating layer uses polyurethane foam material, which has an extremely low thermal conductivity and is an efficient heat-insulating material. The thickness of the heat-insulating layer is set between 50 and 100 millimeters and can be selected according to the specific usage environment and heat-insulation requirements to ensure good heat-insulation performance and reduce cold loss. The heat-insulated liquid storage tank includes a multi-layer structure, which from the inside to the outside are the inner tank, the heat-insulating layer, and the outer shell. The inner tank is made of food-grade or industrial-grade stainless steel and is in direct contact with the antifreeze. The heat-insulating layer is filled with polyurethane foam and is closely attached to the inner tank to provide heat insulation. The outer shell is made of stainless steel or anti-corrosion coated steel plate, which plays a role in protection and enhancing the structure.

[0042] As an alternative example, a stirrer is provided inside the heat-insulated liquid storage tank.

[0043] Optionally, in this embodiment, inside the heat-insulated liquid storage tank, a stirrer (which can be a propeller stirrer) is provided to continuously or intermittently stir the antifreeze in the tank, thereby improving the thermal uniformity and heat exchange efficiency of the antifreeze, preventing the temperature stratification of the antifreeze, ensuring uniform and stable energy storage. The start and stop of the stirrer are uniformly controlled by the control device, and the automatic circulation stirring time or temperature linkage can be set.

[0044] As an alternative example, a liquid level sensor and an automatic liquid replenisher are provided inside the heat-insulated liquid storage tank, and both the liquid level sensor and the automatic liquid replenisher are electrically connected to the control device.

[0045] Optionally, in this embodiment, a liquid level sensor and an automatic liquid replenisher are provided inside the heat-insulated liquid storage tank. The liquid level sensor is used to continuously monitor the liquid level height of the antifreeze, and the data collected by the sensor is sent to the control device through electrical connection. The automatic liquid replenisher is connected to the external antifreeze supply system, receives the liquid replenishment instruction from the control device, and automatically adds liquid according to the signal of the liquid level sensor. The liquid replenishment port is set in the upper middle part of the heat-insulated liquid storage tank, and a check valve is used to prevent backflow. The control device receives the signal of the liquid level sensor and judges whether it is a low liquid level. If the liquid level is lower than the set threshold, the control device automatically drives the liquid replenisher to add liquid, and functions such as high liquid level warning, low liquid level alarm, and dry running protection can be set.

[0046] As an alternative example, a temperature sensor is provided inside the heat-insulated liquid storage tank, and the temperature sensor is electrically connected to the control device.

[0047] Optionally, in this embodiment, a temperature sensor is provided in the heat preservation liquid storage tank for real-time monitoring of the temperature of the antifreeze in the liquid storage tank. The installation position can be set in the middle of the tank body or near the main liquid heat exchange area to ensure that the measured temperature data is representative. It is connected to the control device through electrical connection to achieve real-time data transmission and feedback. The control device can judge the current energy storage state (such as whether the low-temperature energy storage has been completed) according to the data of the temperature sensor, control the start / stop of the refrigeration device, and control the start / stop of the stirrer or circulation pump, so as to realize functions such as temperature range adjustment, upper and lower limit alarm, and linkage control.

[0048] As an optional example, the heat exchange device includes at least one heat exchanger.

[0049] Optionally, in this embodiment, the heat exchanger is the core component for heat transfer, and its function is to exchange the heat of the antifreeze in the liquid storage tank with the target load (such as an external cooling system or the environment). It can be a plate heat exchanger, a shell and tube heat exchanger, a spiral heat exchanger, etc.

[0050] It should be noted that for the foregoing embodiments of the refrigeration and energy storage devices, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0051] According to the second aspect of the embodiments of the present application, a refrigeration and energy storage system is further provided, including the above refrigeration and energy storage devices.

[0052] For other examples of this embodiment, please refer to the above examples and will not be elaborated here.

[0053] According to the third aspect of the embodiments of the present application, a refrigeration and energy storage method is further provided, which is applied to the refrigeration and energy storage device. Optionally, as Figure 2 shown, the above method includes:

[0054] S202, obtain the temperature of the antifreeze in the energy storage device, and when the temperature is greater than the first threshold, or the temperature is greater than the second threshold and the current time point is in the low electricity price period, start the first circulation pump and the refrigeration device to open the first circulation loop. The antifreeze in the energy storage device flows to the refrigeration device through the first circulation loop, and the refrigeration device cools the antifreeze. After the cooling is completed, the antifreeze flows back to the energy storage device through the first circulation loop, where the first threshold is greater than the second threshold;

[0055] S204. When it is detected that the target load needs to be cooled down, start the second circulation pump to open the second circulation loop. The antifreeze in the energy storage device flows to the heat exchange device through the second circulation loop. The heat exchange device cools down the target load through the antifreeze, and after the cooling is completed, the antifreeze flows back to the energy storage device through the second circulation loop.

[0056] Optionally, in this embodiment, the control device of the refrigeration energy storage device obtains the real-time temperature of the antifreeze in the energy storage device through the temperature sensor arranged in the energy storage device. When any of the following conditions is met, the refrigeration and cooling can be started: Condition 1: The temperature of the antifreeze is greater than the first threshold (such as 18 °C); Condition 2: The temperature of the antifreeze is greater than the second threshold (such as 10 °C) and the current time is in the low electricity price period (such as at night), where the first threshold is greater than the second threshold to reflect the flexibility of temperature control and the energy-saving priority, that is, it is preferred to start the refrigeration and cooling during the low electricity price period. When one of the above conditions is met, the control device starts the first circulation pump and the refrigeration device, opens the first circulation loop, and the antifreeze flows into the refrigeration device through the first circulation loop. After the cooling treatment is completed, it flows back to the energy storage device to realize the pre-storage of cold energy and prepare for the peak energy consumption during the day. When the control device detects that the target load (such as an air conditioning system, equipment, etc.) needs to be cooled down, start the second circulation pump and open the second circulation loop. The cooling antifreeze in the energy storage device flows to the heat exchange device through the second circulation loop. The heat exchange device cools down the target load by using the temperature difference of the antifreeze, and the high-temperature antifreeze after heat exchange returns to the energy storage device to form a closed loop.

[0057] Optionally, in this embodiment, make full use of the low electricity price period for cold storage, greatly reduce the energy cost, combine dynamic temperature control with time period judgment to realize the intelligence and strategy of refrigeration startup, and the cold and heat flow back to the closed-loop system to improve the system operation stability and thermal efficiency.

[0058] As an optional example, after starting the first circulation pump, the above method further includes:

[0059] When the current time point is in the low electricity price period and the temperature is less than the third threshold, close the first circulation pump and the refrigeration device to close the first circulation loop, where the third threshold is less than the second threshold.

[0060] Optionally, in this embodiment, based on the energy storage pre-cooling logic, a stop mechanism at low temperatures is further introduced to prevent over-cooling and waste of resources. Specifically, when the current time point is still in a low electricity price period (such as at night), and the temperature of the antifreeze in the energy storage device has dropped below the third threshold (such as -25°C), where the third threshold is less than the second threshold and is used to control the minimum temperature limit to prevent excessive cooling. After the control device recognizes the above conditions, it actively shuts down the first circulation pump and the refrigeration device, thereby closing the first circulation loop and terminating the refrigeration process. By setting the low-temperature cut-off control logic, over-cooling of the antifreeze during the cold storage process is avoided, further improving the energy efficiency and safety of the refrigeration energy storage system.

[0061] As an alternative example, after starting the first circulation pump, the above method further includes:

[0062] When the current time point is in a high electricity price period and the temperature is lower than the fourth threshold, the first circulation pump and the refrigeration device are shut down to close the first circulation loop, where the fourth threshold is less than the second threshold and greater than the third threshold.

[0063] Optionally, in this embodiment, after starting the first circulation pump, a temperature control stop mechanism during high electricity price periods is further set to avoid ineffective refrigeration energy storage behavior within an inappropriate economic time window. Specifically, when the current time point is in a high electricity price period (such as during the day), and the temperature of the antifreeze in the energy storage device has dropped below the fourth threshold (such as -10°C), where the fourth threshold is set between the second threshold and the third threshold and is used as a compromise judgment value for economy and energy efficiency, the control device shuts down the first circulation pump and the refrigeration device, thereby closing the first circulation loop and avoiding continued power consumption for cold storage operations during high electricity price periods. By setting an intermediate temperature control threshold during high electricity price periods, intelligent shutdown of the first circulation is achieved, further improving the economy and control accuracy of the refrigeration energy storage system.

[0064] As an alternative example, the above method further includes:

[0065] Obtain the liquid level of the antifreeze in the energy storage device;

[0066] When the liquid level is lower than the fifth threshold, start the automatic replenisher to add antifreeze to the energy storage device.

[0067] Optionally, in this embodiment, a liquid level monitoring and automatic liquid replenishment mechanism is further introduced to ensure the continuous and stable operation of the system. Specifically, the control device is connected to a liquid level sensor to obtain the liquid level information of the antifreeze in the energy storage device in real time. If the detected liquid level is lower than the fifth threshold (this threshold can be set according to the lowest operating liquid level of the device), it is determined that the current system may have a situation of liquid evaporation, leakage, or increased usage. The control device activates the automatic liquid replenisher to automatically replenish the antifreeze into the energy storage device and restore it to the set liquid level range, ensuring the normal circulation operation of the refrigeration energy storage loop. Through liquid level monitoring and automatic liquid replenishment control, dynamic replenishment of the antifreeze in the energy storage device is realized, ensuring the stable operation of the system and improving the intelligent level.

[0068] According to another aspect of the embodiments of the present application, a computer-readable storage medium is further provided. A computer program is stored in the computer-readable storage medium. When the computer program is run by a processor, it executes the steps in the above-mentioned refrigeration energy storage method.

[0069] Optionally, in this embodiment, those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the relevant hardware of the terminal device through a program. The program can be stored in a computer-readable storage medium, and the storage medium can include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc, etc.

[0070] The serial numbers of the above embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0071] If the integrated unit in the above embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in the above-mentioned computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing one or more computer devices (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0072] In the above embodiments of the present application, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0073] In several embodiments provided by this application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0074] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0075] In addition, in each embodiment of this application, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0076] The above are only the preferred embodiments of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this application.

Claims

1. A refrigeration energy storage device, characterized in that: It includes an energy storage device, a refrigeration device, a heat exchange device and a control device; A first circulation loop is provided between the refrigeration device and the energy storage device, and a first circulation pump is provided on the first circulation loop; A second circulation loop is provided between the energy storage device and the heat exchange device, and a second circulation pump is provided on the second circulation loop; The control device is electrically connected to the energy storage device, the refrigeration device, the heat exchange device, the first circulation pump and the second circulation pump.

2. The refrigeration energy storage device according to claim 1, characterized in that: The antifreeze liquid in the energy storage device flows to the refrigeration device through the first circulation loop, and flows back to the energy storage device through the first circulation loop.

3. The refrigeration energy storage device according to claim 1, characterized in that: The antifreeze liquid in the energy storage device flows to the heat exchange device through the second circulation loop, and flows back to the energy storage device through the second circulation loop.

4. The refrigeration energy storage device according to claim 1, characterized in that: The energy storage device comprises a heat-insulating liquid storage tank, and the heat-insulating liquid storage tank is made of double-layer stainless steel material.

5. The refrigeration energy storage device according to claim 4, characterized in that: The heat-insulating liquid storage tank is filled with a heat-insulating layer, which is made of polyurethane foam material and has a thickness of 50 mm to 100 mm.

6. The refrigeration energy storage device according to claim 4, characterized in that: A stirrer is arranged in the heat-insulating liquid storage tank.

7. The refrigeration energy storage device according to claim 4, characterized in that: A liquid level sensor and an automatic liquid replenisher are arranged in the thermal insulation liquid storage tank, and both the liquid level sensor and the automatic liquid replenisher are electrically connected to the control device.

8. The refrigeration energy storage device according to claim 4, characterized in that: A temperature sensor is arranged in the heat-insulating liquid storage tank, and the temperature sensor is electrically connected to the control device.

9. The refrigeration energy storage device according to claim 1, characterized in that: The heat exchange device comprises at least one heat exchanger.

10. A refrigeration energy storage system, characterized in that: Comprising the refrigeration energy storage device as described in any one of claims 1 to 9.

11. A refrigeration energy storage method, applied to the refrigeration energy storage device according to claim 1, characterized in that: include: Acquire the temperature of the antifreeze liquid in the energy storage device, and when the temperature is greater than a first threshold value, or when the temperature is greater than a second threshold value and the current time point is in a low electricity price period, start the first circulation pump and the refrigeration device to open the first circulation loop, so that the antifreeze liquid in the energy storage device flows to the refrigeration device through the first circulation loop, the refrigeration device cools the antifreeze liquid, and after the cooling is completed, the antifreeze liquid flows back to the energy storage device through the first circulation loop, wherein the first threshold value is greater than the second threshold value; When it is detected that the target load needs to be cooled, the second circulation pump is started to open the second circulation loop, and the antifreeze in the energy storage device flows to the heat exchange device through the second circulation loop. The heat exchange device cools the target load through the antifreeze, and after the cooling is completed, the antifreeze flows back to the energy storage device through the second circulation loop.

12. The refrigeration energy storage method according to claim 11, characterized in that: After starting the first circulation pump, the method further comprises: When the current time point is in the low electricity price period and the temperature is less than a third threshold, the first circulation pump and the refrigeration device are turned off to close the first circulation loop, wherein the third threshold is less than the second threshold.

13. The refrigeration energy storage method according to claim 11, characterized in that: After starting the first circulation pump, the method further comprises: When the current time point is in a high electricity price period and the temperature is lower than a fourth threshold, the first circulation pump and the refrigeration device are turned off to close the first circulation loop, wherein the fourth threshold is smaller than the second threshold and larger than the third threshold.

14. The refrigeration energy storage method according to claim 11, characterized in that: The method further comprises: Obtaining the liquid level of the antifreeze fluid in the energy storage device; When the liquid level is lower than a fifth threshold, the automatic liquid replenisher is started to replenish antifreeze liquid into the energy storage device.

15. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method as claimed in any one of claims 11 to 14 is executed.

Images