Cooling system

Abstract

The invention relates to the technical field of heat exchange, in particular to a cooling system, and aims to solve the problem of how to reduce energy consumption of a heat pump unit. In order to achieve the purpose, the cooling system comprises a heat pump unit, a heat source is connected between the input end and the output end of the heat pump unit, a cooling loop is formed between the heat pump unit and the heat source, and a cooling working medium is arranged in the cooling loop; a cold source of the first auxiliary heat exchange system is a natural medium; the first control valve is arranged at the input end of the heat pump unit; the first bypass branch is arranged between the first control valve and the first auxiliary heat exchange system in a communicating manner; the second bypass branch is arranged between the first auxiliary heat exchange system and the output end of the heat pump unit in a communicating manner; and the controller is in communication connection with the first control valve, and the controller can control the working state of the first control valve so as to determine the operation mode of the cooling system. The energy consumption of the heat pump unit can be reduced, and the refrigerating efficiency of the heat pump unit can be improved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and specifically provides a cooling system. Background Art

[0002] Currently, in power systems, energy storage systems, and other fields, air cooling and liquid cooling are commonly used to cool heat sources to ensure stable system operation. For example, in lithium battery energy storage systems, lithium batteries generate a large amount of heat during the charging and discharging process. If the battery is not cooled in a timely manner and the operating temperature is not controlled within a certain range, it will lead to battery performance degradation and even pose a safety hazard.

[0003] In some related technologies, a heat pump unit (liquid cooling cycle) is used to cool the above-mentioned lithium battery energy storage system. However, in actual applications, if the heat pump unit is always kept in operation, the temperature of its condensing side will be too high, which will not only increase the energy consumption of the heat pump unit, but also reduce its cooling efficiency.

[0004] Accordingly, this field requires a new technical solution to solve the above problems. Summary of the Invention

[0005] This application aims to solve the above technical problem, that is, to solve the problem of how to reduce the energy consumption of heat pump units.

[0006] In a first aspect, the present application provides a cooling system comprising:

[0007] A heat pump unit, wherein the input and output ends of the heat pump unit are connected to a heat source to be cooled, a cooling circuit is formed between the heat pump unit and the heat source, and a cooling medium is provided in the cooling circuit;

[0008] a first auxiliary heat exchange system, wherein the cold source of the first auxiliary heat exchange system is a natural medium;

[0009] a first control valve, which is arranged at the input end of the heat pump unit;

[0010] a first bypass branch, which is connected between the first control valve and the first auxiliary heat exchange system;

[0011] a second bypass branch, which is connected between the first auxiliary heat exchange system and the output end of the heat pump unit;

[0012] A controller is in communication with the first control valve, and the controller controls the working state of the first control valve according to the external environment temperature, thereby determining the operating mode of the cooling system.

[0013] In a technical solution of the above cooling system, a first circuit is further provided between the first auxiliary heat exchange system and the condensing side of the heat pump unit, and the first auxiliary heat exchange system can cool the condensing side of the heat pump unit through the first circuit when it is in operation.

[0014] In one technical solution of the above cooling system, the cooling system further includes:

[0015] a second auxiliary heat exchange system, which is arranged in parallel with the first auxiliary heat exchange system, wherein an input end of the second auxiliary heat exchange system is in communication with the first bypass branch, and an output end of the second auxiliary heat exchange system is in communication with the second bypass branch;

[0016] The cold source of the second auxiliary heat exchange system is external air.

[0017] In one technical solution of the above cooling system, a second circuit is further provided between the second auxiliary heat exchange system and the condensing side of the heat pump unit, and the second auxiliary heat exchange system can cool the condensing side of the heat pump unit through the second circuit when it is in operation.

[0018] In one technical solution of the above cooling system, the controller controls the working state of the first control valve according to the external ambient temperature, thereby determining the operating mode of the cooling system, including:

[0019] When the outside air temperature and the natural medium temperature are both greater than or equal to a preset temperature, the first control valve is controlled to operate so that the cooling medium enters the heat pump unit, and the first auxiliary heat exchange system and the second auxiliary heat exchange system are controlled to operate;

[0020] When the outside air temperature or the natural medium temperature is lower than a preset temperature, the first control valve is controlled to operate so that the cooling medium enters the first auxiliary heat exchange system and the second auxiliary heat exchange system respectively, and the first auxiliary heat exchange system and the second auxiliary heat exchange system are controlled to operate.

[0021] In one technical solution of the above cooling system, controlling the first control valve to operate so that the cooling medium enters the first auxiliary heat exchange system and the second auxiliary heat exchange system respectively includes:

[0022] Inputting the values ​​of the outside air temperature and the natural medium temperature into a target detection model to obtain an input flow ratio of the cooling medium into the first auxiliary heat exchange system and the second auxiliary heat exchange system;

[0023] The target detection model reflects the mapping relationship between the outside air temperature, the natural medium temperature and the input flow ratio.

[0024] In one technical solution of the above-mentioned cooling system, the target detection model is obtained through actual experiments, and in the actual application of the cooling system, by collecting data on the outside air temperature, data on the natural medium temperature, data on the input flow ratio of the cooling medium entering the first auxiliary heat exchange system and the second auxiliary heat exchange system, and the refrigeration coefficient of the cooling system as a data set, a neural network model is trained to update the target detection model.

[0025] In one technical solution of the above cooling system, the cooling system further includes:

[0026] a second control valve, which is arranged at the end of the first bypass branch, and the input end of the first auxiliary heat exchange system and the input end of the second auxiliary heat exchange system are both in communication with the second control valve;

[0027] The controller is further in communication with the second control valve to control the flow of the cooling medium into the first auxiliary heat exchange system and the second auxiliary heat exchange system.

[0028] In one technical solution of the above cooling system, the cooling system further includes:

[0029] a third control valve, the output end of the second auxiliary heat exchange system being in communication with the third control valve, the third control valve being located in the second bypass branch and the second loop respectively;

[0030] The controller is also in communication with the third control valve to control the cooling medium to enter the cooling circuit through the second bypass branch, or to control the cooling medium to cool the condensing side of the heat pump unit through the second circuit.

[0031] In one technical solution of the above cooling system, the natural medium is soil, a pond or a river.

[0032] As described above, when the temperature is high, the present application controls the working state of the first control valve so that during the operation of the heat pump unit, the first auxiliary heat exchange system and the second auxiliary heat exchange system are controlled to operate simultaneously, and the condensing side of the heat pump unit is cooled by means of external air and natural medium, which can improve the refrigeration efficiency of the heat pump unit and reduce the total energy consumption of the cooling system. When the temperature is low, the present application controls the working state of the first control valve so that the heat pump unit is in a non-operating state, and at the same time, the heat source is cooled by the first auxiliary heat exchange system and the second auxiliary heat exchange system with the help of external air and natural medium, and the heat of the heat source is transferred to the external environment, thereby minimizing the energy consumption of the cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The preferred embodiments of the present application are described below with reference to the accompanying drawings, in which:

[0034] Figure 1 is a schematic diagram of a cooling system according to one embodiment of the present application;

[0035] Figure 2 is a schematic diagram of a cooling system in a first working state according to an embodiment of the present application;

[0036] Figure 3 is a schematic diagram of a cooling system in a second working state according to an embodiment of the present application;

[0037] Figure 4 is a flow chart of the main steps of a method for controlling a cooling system according to one embodiment of the present application;

[0038] Figure 5 It is a detailed step flow chart of a method for controlling a cooling system according to an embodiment of the present application.

[0039] In the figures, the reference numerals refer to the following:

[0040] 1. Heat pump unit; 2. First auxiliary heat exchange system; 3. Second auxiliary heat exchange system; 11. Evaporator; 12. Condenser; 4. First control valve; 5. Second control valve; 6. Third control valve;

[0041] 100, heat source; 200, cooling circuit; 210, first bypass branch; 220, second bypass branch; 300, first circuit; 400, second circuit. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art may adjust these embodiments as needed to suit specific applications.

[0043] It should be noted that, in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the relevant devices or components must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Furthermore, it should be noted that, in the description of this application, unless otherwise specified or limited, the terms "installed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] This application uses lithium batteries as heat sources for illustrative purposes. For example, in scenarios such as large charging stations, a large amount of heat is generated during the charging and discharging process of lithium batteries. The lithium batteries are cooled by a heat pump unit. During the operation of the heat pump unit, the condensing side requires a cold source to cool it down to prevent the normal operation of the heat pump unit from being affected by the high condenser temperature, while increasing the energy consumption of the heat pump unit.

[0046] In order to improve the above phenomenon, some related technologies use air cooling units to cool the condensing side of the heat pump unit. However, using this method, the air cooling unit itself also has a certain amount of energy consumption, which will cause an increase in energy consumption. At the same time, the air cooling unit will also generate a lot of noise, causing noise pollution.

[0047] Although in some related technologies, air sources and soil sources are used as cold sources to cool the heat source based on the perspective of cost reduction and energy saving, in actual applications, they are affected by natural conditions. For example, in hot summer or at noon, the outside temperature is too high, which will cause the temperature of the outside air source and soil source to rise. Then the cooling effect of the air source and soil source as cold sources will be greatly reduced, or even unable to cool the heat source. Therefore, the application of the above method has great limitations. The technical solution of the present application is adopted to combine the heat pump system with the first auxiliary heat exchange system and the second auxiliary heat exchange system, and the coordination relationship between the above three is selected according to the ambient temperature, so as to effectively improve the above phenomenon and ensure the cooling effect.

[0048] Reference Figure 1 , is a schematic diagram of a cooling system according to an embodiment of the present application, which includes a heat pump unit 1, a first auxiliary heat exchange system 2, a second auxiliary heat exchange system 3 and a controller (not shown in the figure).

[0049] The heat pump unit 1 includes an evaporator 11, a condenser 12, and components such as a compressor and a throttling device arranged between the evaporator 11 and the condenser 12. These are well-known technologies in the art and will not be described in detail in this application. For the convenience of expression, this application refers to the side of the heat pump unit 1 where the evaporator 11 is located as the evaporation side, and the side where the condenser 12 is located as the condensation side. The middle end of the evaporation side is referred to as the input end of the heat pump unit 1, and the other end is referred to as the output end of the heat pump unit 1. In this way, a heat source 100 is connected between the input end and the output end of the heat pump unit 1. The heat source 100 can be composed of multiple battery packs. A cooling circuit 200 is formed between the heat pump unit 1 and the heat source 100. A cooling medium is provided in the cooling circuit 200. The cooling medium can be a liquid medium, such as water.

[0050] The cooling source of the first auxiliary heat exchange system 2 is a natural medium, which can optionally be soil, a pond, or a river. The cooling source of the second auxiliary heat exchange system 3 is the outside air. Both the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 are equipped with a heat exchanger. The heat exchanger of the first auxiliary heat exchange system 2 can be in direct contact with the soil, a pond, or a river, while the heat exchanger of the second auxiliary heat exchange system 3 can be in direct contact with the outside air.

[0051] The first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 are arranged in parallel. A first control valve 4 is provided near the input end of the cooling circuit 200 of the heat pump unit 1. A first bypass branch 210 is provided between the first control valve 4 and the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3. A controller is in communication with the first control valve 4. By controlling the operating state of the first control valve 4, the controller can control the coolant in the cooling circuit 200 to only enter the heat pump unit 1, or control the coolant in the cooling circuit 200 to only enter the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 through the first bypass branch 210.

[0052] Optionally, in order to control the flow ratio of the cooling medium entering the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3, a second control valve 5 is provided at the end of the first bypass branch 210, and the input end of the first auxiliary heat exchange system 2 and the input end of the second auxiliary heat exchange system 3 are both connected to the second control valve 5. In this way, the controller is communicated with the second control valve 5, and the controller can control the working state of the second control valve 5 to change the flow rate of the cooling medium entering the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3.

[0053] The output ends of the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 are further provided with a second bypass branch 220. The end of the second bypass branch 220 away from the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 is connected to the position of the cooling circuit 200 near the output end of the heat pump unit 1, so that the cooling medium enters the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 through the first bypass branch 210, and then enters the cooling circuit 200 through the second bypass branch 220, forming a closed loop.

[0054] As one embodiment of the present application, a first loop 300 is further provided between the first auxiliary heat exchange system 2 and the condensing side of the heat pump unit 1. The first loop 300 also contains a cooling medium, and the portion of the first loop 300 near the condensing side can exchange heat with the condenser 12. Thus, the controller controls the operating state of the first control valve 4 so that when the cooling medium in the cooling loop 200 does not pass through the first bypass branch 210, the first auxiliary heat exchange system 2 is controlled to operate, and the cooling medium in the first loop 300 circulates to cool the condensing side of the heat pump unit 1.

[0055] As an embodiment of the present application, a second circuit 400 is similarly provided between the second auxiliary heat exchange system 3 and the condensing side of the heat pump unit 1. The second circuit 400 also contains a cooling medium, and the portion of the second circuit 400 close to the condensing side can exchange heat with the condenser 12. Thus, the controller controls the operating state of the first control valve 4 so that when the cooling medium in the cooling circuit 200 does not pass through the first bypass branch 210, the second auxiliary heat exchange system 3 is controlled to operate, and the cooling medium in the second circuit 400 circulates to cool the condensing side of the heat pump unit 1.

[0056] Optionally, the second control valve 5 is arranged in the first loop 300. The second control valve 5 can not only control the flow of the cooling medium in the first bypass branch 210 into the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 respectively, but also control the flow direction of the cooling medium in the first loop 300. For example, when the cooling medium in the cooling loop 200 is controlled by the first control valve 4 to only enter the first bypass branch 210, the heat pump unit 1 does not work. At this time, there is no need to cool the condensing side of the heat pump unit 1. Therefore, the first loop 300 can be controlled to be disconnected by the second control valve 5, so that the cooling medium only enters the second bypass branch 220 through the first auxiliary heat exchange system 2.

[0057] Similarly, in one possible implementation of the present application, a third control valve 6 is further provided in communication with the second bypass branch 220, and the third control valve 6 is located in the second circuit 400, and the output end of the second auxiliary heat exchange system 3 is connected to the third control valve 6. The controller is in communication with the third control valve 6, so that the third control valve 6 can control the flow direction of the coolant. For example, when the first control valve 4 controls the coolant in the cooling circuit 200 to enter only the first bypass branch 210, the heat pump unit 1 is not operating, and there is no need to cool the condensing side of the heat pump unit 1. Therefore, the third control valve 6 can control the second circuit 400 to be disconnected, so that the coolant only enters the second bypass branch 220 through the second auxiliary heat exchange system 3. Of course, when the first control valve 4 controls the coolant in the cooling circuit 200 to enter only the heat pump unit 1, it is also necessary to adjust the third control valve 6 to disconnect the second bypass branch 220, so that the first circuit 300 and the second circuit 400 each form an independent closed loop.

[0058] The following combination Figure 2 and Figure 3 , introduce the operating status of the cooling system of this application, Figure 2 FIG1 is a schematic diagram of a first working state of a cooling system according to an embodiment of the present application. Figure 3 Schematic diagram of the second working state of the cooling system according to one embodiment of the present application, wherein the first working state refers to the state when the heat pump unit 1 is in operation, and the second working state refers to the state when the heat pump unit 1 is not in operation.

[0059] When the heat source 100 is cooled by the cooling system, the operating state of the cooling system can be determined according to the external environment temperature, wherein the external environment temperature can be the external air temperature or the natural medium temperature. Optionally, the cooling system may include a temperature sensor arranged outdoors, wherein two temperature sensors are provided, one of which is in contact with the external air and the other is in contact with the natural medium, and both temperature sensors are connected to the controller for communication. When the temperature sensors detect that the external air temperature and the natural medium temperature are both greater than or equal to the preset temperature, the heat pump unit 1 is controlled to participate in operation. Specifically, referring to Figure 1 and Figure 2The controller controls the working state of the first control valve 4 so that the cooling medium in the cooling circuit 200 only enters the heat pump unit 1 (at this time, the first bypass branch 210 and the second bypass branch 220 are both in the disconnected state). During the operation of the heat pump unit 1, the cooling medium in the cooling circuit 200 passes through the evaporator 11 and circulates, and the cooling medium cools the heat source 100. At the same time, the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 are also in operation. For the first auxiliary heat exchange system 2, the external natural medium, such as soil, pond, river, etc., serves as a cold source, and exchanges heat with the cooling medium in the first auxiliary heat exchange system 2 through the first loop 300, thereby cooling the condensing side of the heat pump unit 1. For the second auxiliary heat exchange system 3, the outside air serves as a cold source, and exchanges heat with the cooling medium in the second auxiliary heat exchange system 3 through the second loop 400, thereby cooling the condensing side of the heat pump unit 1, thereby realizing cooling the condensing side of the heat pump unit 1 during the operation of the heat pump unit 1, improving the refrigeration effect of the heat pump unit 1, and reducing the energy consumption of the heat pump unit 1.

[0060] It should be noted that although the first circuit 300 and the second circuit 400 partially overlap in the drawings of the present application, this does not constitute a limitation to the present application. It is only a schematic diagram made for the convenience of illustration. In actual applications, the first circuit 300 and the second circuit 400 can be two independent circuits, which are arranged in parallel and perform heat exchange with the condenser 12 respectively.

[0061] Reference Figure 1 and Figure 3 When the temperature sensor detects that one of the outside air temperature and the natural medium temperature is less than the preset temperature, the heat pump unit 1 is controlled to be in a non-operating state. Specifically, the controller controls the working state of the first control valve 4 so that the cooling medium in the cooling circuit 200 only enters the first bypass branch 210 (the heat pump unit 1 does not participate in refrigeration at this time and is omitted from the figure). At the same time, the controller controls the operation of the second control valve 5 to adjust the flow ratio of the cooling medium entering the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3. After passing through the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3, the cooling medium is merged into the cooling circuit 200 through the second bypass branch 220, thus forming a closed circulation loop. In this process, the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 work simultaneously, using the outside natural medium and the outside air as cold sources respectively, and exchanging heat with the heat source 100 through the cooling medium, thereby cooling the heat source 100.

[0062] It should be noted that the above-mentioned preset temperature can be set according to actual needs, for example, 10°C, 15°C, etc. In some areas, the temperature difference between the four seasons or the temperature difference between day and night is large. When the outside air temperature is greater than or equal to the preset temperature, it may be in summer or the high temperature period around noon of the day. When the outside air temperature is less than the preset temperature, it may be in winter, the latter being the low temperature period around night of the day. Therefore, in this application, the judgment of whether the heat pump unit 1 is in operation may depend on the local seasonal changes or the changes in the time period of the day.

[0063] As can be seen from the above, when the temperature is high, the present application controls the working state of the first control valve 4 so that during the operation of the heat pump unit 1, the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 are controlled to operate simultaneously, and the condensing side of the heat pump unit 1 is cooled by means of external air and natural medium, which can improve the refrigeration efficiency of the heat pump unit 1 and reduce the total energy consumption of the cooling system. When the temperature is low, the present application controls the working state of the first control valve 4 so that the heat pump unit 1 is in a non-operating state, and at the same time, the heat source 100 is cooled by the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 by means of external air and natural medium, and the heat of the heat source 100 is transferred to the external environment, thereby minimizing the energy consumption of the cooling system.

[0064] Furthermore, when the heat pump unit 1 is in a non-operating state, the present application can also control the flow ratio entering the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 through the second control valve 5, thereby determining the optimal cooling strategy.

[0065] Reference Figure 4 , the present application also discloses a control method for a cooling system, which comprises the following main steps:

[0066] S101: During the operation of the heat source, the outside air temperature and the natural medium temperature are obtained.

[0067] Here, the natural medium temperature refers to the temperature of the soil, pond or river that the heat exchanger in the first auxiliary heat exchange system contacts. Therefore, it can be understood that a temperature sensor in contact with the above-mentioned natural medium can be set in the second auxiliary heat exchange system to monitor the temperature of the natural medium in real time.

[0068] S102: Control the working state of the first control valve according to the outside air temperature and the natural medium temperature, thereby determining the operation mode of the cooling system.

[0069] The operation modes of the cooling system in step S102 include: Figure 2 and Figure 3There are two modes, namely, the heat pump unit 1 participates in the refrigeration process, and the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 assist in cooling the condensing side of the heat pump unit 1, or the heat pump unit 1 does not participate in the refrigeration process, and the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3 operate separately.

[0070] Reference Figure 5 , is a detailed flowchart of a method for controlling a cooling system according to an embodiment of the present application, wherein step S102 specifically includes:

[0071] S1021: When the outside air temperature and the natural medium temperature are both greater than or equal to the preset temperature, the first control valve is controlled to operate so that the cooling medium enters the heat pump unit, and the first auxiliary heat exchange system and the second auxiliary heat exchange system are controlled to operate.

[0072] S1022: When the outside air temperature or the natural medium temperature is lower than the preset temperature, the first control valve is controlled to operate so that the cooling medium enters the first auxiliary heat exchange system and the second auxiliary heat exchange system respectively, and the operation of the first auxiliary heat exchange system and the second auxiliary heat exchange system is controlled.

[0073] Step S1022 indicates that when one of the outside air temperature and the natural medium temperature is lower than the preset temperature, the Figure 3 This is because, in some cases, even if the outside air temperature is high, the natural medium temperature is lower than the outside air temperature. At this time, the first auxiliary heat exchange system can still play a certain cooling role. According to actual conditions, the flow rate of the first auxiliary heat exchange system can be made greater than the flow rate of the second auxiliary heat exchange system by controlling the input flow ratio.

[0074] The specific processes of step S1021 and step S1022 can be referred to the above cooling system embodiment, and this application will not go into details here.

[0075] In one implementation of the present application, in step S1022, “controlling the first control valve to operate so that the cooling medium enters the first auxiliary heat exchange system and the second auxiliary heat exchange system, respectively, and controlling the operation of the first auxiliary heat exchange system and the second auxiliary heat exchange system” further includes:

[0076] The outside air temperature and the natural medium temperature are input into the target detection model to obtain the input flow ratio of the cooling medium into the first auxiliary heat exchange system and the second auxiliary heat exchange system.

[0077] The target detection model reflects the mapping relationship between the outside air temperature, the natural medium temperature and the input flow ratio.

[0078] The target detection model can be obtained by testing the actual operating state of the cooling system under different parameter conditions. Specifically, the following methods can be used:

[0079] When the heat pump unit 1 is not in operation, different flow ratios are first performed under a certain temperature combination to determine the input flow ratio when the COP (Coefficient of Operation) of the cooling system is the highest under the temperature combination.

[0080] For example, under the conditions that the outside air temperature T1 is 15°C and the natural medium temperature T2 is 10°C, the second control valve is adjusted to change the input flow ratio Q1 / Q2 entering the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3. When Q1 / Q2 has different values, the COP of the cooling system is recorded respectively, and the input flow ratio with the highest COP is selected as the optimal value.

[0081] Then, based on the above steps, tests were conducted under multiple temperature combination conditions to determine the input flow ratio at which the COP is the highest under each temperature combination condition, and the data were compiled into a data set.

[0082] Finally, based on the dataset, an expression of the target detection model is constructed, such as f(T1, T2) = Q1 / Q2.

[0083] It should be noted that in the above method, the target detection model is obtained based on actual testing. However, considering that the collected data set is limited, in order to obtain as many data sets as possible to maximize the coverage of various working conditions, in some implementation methods, a neural network model can also be used to train the target detection model to improve the accuracy of the target detection model.

[0084] As mentioned above, the present application pre-constructs a target detection model and performs feedback adjustment through the target detection model to control the input flow ratio of the first auxiliary heat exchange system 2 and the second auxiliary heat exchange system 3, and determines the optimal operating mode of the cooling system, thereby further improving the cooling efficiency of the cooling system.

[0085] Furthermore, after the present application constructs a target detection model based on actual experiments, in the actual application of the cooling system, it is also possible to train a neural network model by collecting data on the outside air temperature, data on the natural medium temperature, data on the input flow ratio of the cooling medium entering the first auxiliary heat exchange system and the second auxiliary heat exchange system, and the refrigeration coefficient of the cooling system as a data set to update the target detection model, thereby improving the accuracy of the target detection model.

[0086] Thus far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A cooling system, characterized in that: include: A heat pump unit, wherein the input and output ends of the heat pump unit are connected to a heat source to be cooled, a cooling circuit is formed between the heat pump unit and the heat source, and a cooling medium is provided in the cooling circuit; a first auxiliary heat exchange system, wherein the cold source of the first auxiliary heat exchange system is a natural medium; a first control valve, which is arranged at the input end of the heat pump unit; a first bypass branch, which is connected between the first control valve and the first auxiliary heat exchange system; a second bypass branch, which is connected between the first auxiliary heat exchange system and the output end of the heat pump unit; A controller is in communication with the first control valve, and the controller controls the working state of the first control valve according to the external environment temperature, thereby determining the operating mode of the cooling system.

2. The cooling system according to claim 1, characterized in that A first circuit is further provided between the first auxiliary heat exchange system and the condensing side of the heat pump unit. When the first auxiliary heat exchange system is in operation, the condensing side of the heat pump unit can be cooled through the first circuit.

3. The cooling system according to claim 2, characterized in that The cooling system further comprises: a second auxiliary heat exchange system, which is arranged in parallel with the first auxiliary heat exchange system, wherein an input end of the second auxiliary heat exchange system is in communication with the first bypass branch, and an output end of the second auxiliary heat exchange system is in communication with the second bypass branch; The cold source of the second auxiliary heat exchange system is external air.

4. The cooling system according to claim 3, characterized in that A second circuit is further provided between the second auxiliary heat exchange system and the condensing side of the heat pump unit. When the second auxiliary heat exchange system is in operation, the condensing side of the heat pump unit can be cooled through the second circuit.

5. The cooling system according to claim 4, characterized in that The controller controls the working state of the first control valve according to the external ambient temperature, thereby determining the operating mode of the cooling system, including: When the outside air temperature and the natural medium temperature are both greater than or equal to a preset temperature, the first control valve is controlled to operate so that the cooling medium enters the heat pump unit, and the first auxiliary heat exchange system and the second auxiliary heat exchange system are controlled to operate; When the outside air temperature or the natural medium temperature is lower than a preset temperature, the first control valve is controlled to operate so that the cooling medium enters the first auxiliary heat exchange system and the second auxiliary heat exchange system respectively, and the first auxiliary heat exchange system and the second auxiliary heat exchange system are controlled to operate.

6. The cooling system according to claim 5, characterized in that The controlling the first control valve to operate so that the cooling medium enters the first auxiliary heat exchange system and the second auxiliary heat exchange system respectively includes: Inputting the values ​​of the outside air temperature and the natural medium temperature into a target detection model to obtain an input flow ratio of the cooling medium into the first auxiliary heat exchange system and the second auxiliary heat exchange system; The target detection model reflects the mapping relationship between the outside air temperature, the natural medium temperature and the input flow ratio.

7. The cooling system according to claim 6, characterized in that The target detection model is obtained through actual experiments, and in the actual application of the cooling system, by collecting data on the outside air temperature, data on the natural medium temperature, data on the input flow ratio of the cooling medium entering the first auxiliary heat exchange system and the second auxiliary heat exchange system, and the refrigeration coefficient of the cooling system as a data set, a neural network model is trained to update the target detection model.

8. The cooling system according to claim 3 or 4, characterized in that: The cooling system further comprises: a second control valve, which is arranged at the end of the first bypass branch, and the input end of the first auxiliary heat exchange system and the input end of the second auxiliary heat exchange system are both in communication with the second control valve; The controller is further in communication with the second control valve to control the flow of the cooling medium into the first auxiliary heat exchange system and the second auxiliary heat exchange system.

9. The cooling system according to claim 4, characterized in that The cooling system further comprises: a third control valve, the output end of the second auxiliary heat exchange system being in communication with the third control valve, the third control valve being located in the second bypass branch and the second loop respectively; The controller is also in communication with the third control valve to control the cooling medium to enter the cooling circuit through the second bypass branch, or to control the cooling medium to cool the condensing side of the heat pump unit through the second circuit.

10. The cooling system according to claim 1, wherein: The natural medium is soil, pond or river.

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