Control method of cooling system, cooling system, and storage medium

Abstract

The application provides a cooling system control method, a cooling system and a storage medium, and belongs to the technical field of cooling. The method comprises the following steps: acquiring return air temperature in a target space, target air temperature and target refrigerating capacity under the condition that the cooling system is in a first working mode, the target air is used for heat exchange with the return air in the target space, and the first working mode is a working mode for controlling the rotating speed of an external fan in the cooling system based on the supply air temperature in the target space and a target temperature; determining a first rotating speed of the external fan based on the return air temperature, the target air temperature and the target refrigerating capacity, the first rotating speed being a rotating speed meeting the target refrigerating capacity; and controlling the cooling system to switch to a second working mode under the condition that the rotating speed of the external fan is greater than the first rotating speed, wherein the rotating speed of the external fan in the second working mode is lower than the rotating speed in the first working mode, and the above method can improve the energy efficiency of the cooling system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling, and in particular to a control method of a cooling system, the cooling system and a storage medium. BACKGROUND

[0002] The cooling system exchanges heat between outdoor air and indoor air through an air heat exchanger, so as to cool the indoor air. In the case where the demand for refrigeration capacity is unchanged, as the outdoor air temperature rises, the cooling system needs to increase the speed of an outdoor fan to generate sufficient refrigeration capacity. However, when adjusting the speed of the outdoor fan, overshoot may occur, that is, the speed of the outdoor fan is adjusted to a speed that exceeds the speed required for the target refrigeration capacity, which results in low energy efficiency of the cooling system. SUMMARY

[0003] The embodiments of the present application provide a control method of a cooling system, the cooling system and a storage medium, which can improve the energy efficiency of the cooling system. The technical solutions are as follows:

[0004] In one aspect, a control method of a cooling system is provided, the cooling system being used to reduce the temperature in a target space, and the method comprising:

[0005] In the case where the cooling system is in a first working mode, obtaining the return air temperature in the target space, the temperature of target air and a target refrigeration capacity, the target air being used to exchange heat with the return air in the target space, the first working mode being a working mode in which the speed of an outdoor fan in the cooling system is controlled based on the supply air temperature in the target space and a target temperature;

[0006] Determining a first speed of the outdoor fan based on the return air temperature, the temperature of the target air and the target refrigeration capacity, the target refrigeration capacity being the amount of heat that needs to be removed from the target space by the cooling system per unit time, and the first speed being a speed that meets the target refrigeration capacity;

[0007] In the case where the speed of the outdoor fan is greater than the first speed, controlling the cooling system to switch to a second working mode, wherein the speed of the outdoor fan in the second working mode is lower than the speed in the first working mode.

[0008] In another aspect, a cooling system is provided, comprising a control device and an air heat exchanger, an indoor fan, an outdoor fan, a spraying device and a compressor connected to the control device, the control device being used to control the air heat exchanger, the indoor fan, the outdoor fan, the spraying device and the compressor to reduce the temperature in a target space;

[0009] The control device includes a processor and a memory, and at least one computer program is stored in the memory, the computer program is loaded and executed by the processor to realize the operation performed in the control method of the cooling system in any possible implementation manner.

[0010] In another aspect, a computer readable storage medium is provided, and at least one computer program is stored in the computer readable storage medium, the computer program is loaded and executed by a processor to realize the operation performed in the control method of the cooling system in any possible implementation manner.

[0011] In still another aspect, a computer program product or a computer program is provided, and the computer program product or the computer program includes a computer program stored in a computer readable storage medium. The processor of the computer device reads the computer program from the computer readable storage medium, and the processor executes the computer program, so that the computer device performs the operation performed in the control method of the cooling system in various optional implementation manners.

[0012] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0013] In the embodiments of the present application, since the first rotating speed is determined based on the return air temperature and the target air temperature, and the target refrigerating capacity is satisfied, the rotating speed of the outdoor fan is greater than the first rotating speed, which indicates that the outdoor fan has an overshoot phenomenon, that is, the rotating speed of the outdoor fan exceeds the required rotating speed, which indicates that part of the power consumption of the cooling system is wasted. Therefore, in the case that the rotating speed of the outdoor fan is greater than the first rotating speed, the first working mode is switched to the second working mode to reduce the rotating speed of the outdoor fan, which can avoid power consumption waste and improve the energy efficiency of the cooling system. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 is a schematic diagram of a cooling system provided by the embodiments of the present application;

[0016] Figure 2 is a flowchart of a control method of a cooling system provided by the embodiments of the present application;

[0017] Figure 3 is a flowchart of a control method of a cooling system provided by the embodiments of the present application;

[0018] Figure 4 This is a schematic diagram of the relationship between the rotation speed and cooling capacity of an external fan provided in an embodiment of the present application;

[0019] Figure 5 This is a schematic diagram of a process for controlling a cooling system provided by an embodiment of the present application;

[0020] Figure 6 This is a schematic diagram of the relationship between the rotation speed of an external fan and system power consumption provided in an embodiment of the present application;

[0021] Figure 7 This is a schematic diagram of the relationship between the rotation speed and cooling capacity of an external fan provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0023] As used herein, the terms "first," "second," "third," "fourth," and the like may be used to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are used solely to distinguish one concept from another. For example, a first operating mode may be referred to as an operating mode, and similarly, a second operating mode may be referred to as a first operating mode without departing from the scope of this application.

[0024] As used herein, the terms "at least one," "plurality," "each," and "any" include one, two, or more, "plurality" includes two or more, "each" refers to each of the corresponding plurality, and "any" refers to any one of the plurality. For example, if a plurality of speeds includes three speeds, "each" refers to each of the three speeds, and "any" refers to any one of the three speeds, which can be the first, second, or third.

[0025] Figure 1 Schematic diagram of a cooling system 100 provided in an embodiment of the present application. Figure 1 The cooling system 100 includes a control device 101 and an air heat exchanger 102, an inner fan 103, an outer fan 104, a spray device 105 and a compressor 106 connected to the control device 101. The control device 101 is used to control the air heat exchanger 102, the inner fan 103, the outer fan 104, the spray device 105 and the compressor 106 to reduce the temperature in the target space.

[0026] The inner air fan 103 is configured to provide internal circulation power, i.e., to send the return air in the target space to the air heat exchanger 102, and to send the air after heat exchange to the target space. The outer air fan 104 is configured to provide external circulation power, i.e., to send the air outside the target space to the heat exchanger, and to send the air after heat exchange to the target space.

[0027] The air heat exchanger 102 is configured to exchange heat between the air outside the target space and the return air in the target space. The spraying device 105 is configured to spray the air outside the target space, so as to cool the air outside the target space. Correspondingly, the outer air fan 104 is configured to send the sprayed air to the heat exchanger.

[0028] The compressor 106 is configured to compress and drive the refrigerant. The compressor 106 includes a condenser and an evaporator. The condenser is configured to compress and cool the gaseous refrigerant, and to send the heat generated by the refrigerant to the outside of the target space, so that the refrigerant changes from the gaseous state to the liquid state and the pressure increases. The evaporator is configured to change the liquid refrigerant into the gaseous state, and to absorb the heat of the return air in the target space. In this way, the compressor 106 can absorb the heat in the target space into the refrigerant, and send the heat to the outside of the target space through the refrigerant, so as to reduce the temperature in the target space.

[0029] The cooling system 100 includes multiple working modes, i.e., a dry mode, a wet mode and a mixed mode. In the dry mode, the control device controls the inner air fan 103, the outer air fan 104 and the air heat exchanger 102 to generate refrigeration capacity. In the wet mode, the control device controls the inner air fan 103, the outer air fan 104, the air heat exchanger 102 and the spraying device 105 to generate refrigeration capacity. In the mixed mode, the control device controls the inner air fan 103, the outer air fan 104, the air heat exchanger 102, the spraying device 105 and the compressor 106 to generate refrigeration capacity.

[0030] In the embodiment of the present application, when the cooling system 100 is in the dry mode, the control device is configured to determine a first rotating speed of the outer air fan 104 that satisfies the target refrigeration capacity in the dry mode based on the temperature of the return air in the target space and the temperature of the air outside the target space. When the rotating speed of the outer air fan 104 is greater than the first rotating speed, the cooling system 100 is switched to the wet mode. When the cooling system 100 is in the wet mode, the control device is configured to determine a first rotating speed of the outer air fan 104 that satisfies the target refrigeration capacity in the wet mode based on the temperature of the return air in the target space and the temperature of the air after spraying. When the rotating speed of the outer air fan 104 is greater than the first rotating speed, the cooling system 100 is switched to the mixed mode.

[0031] The cooling system in the embodiments of the present application can be applied in the scenario of cooling a data center. The data center refers to a complete set of IT (Internet Technology) equipment for data processing and data storage. The data center is located in a target space. Since the data center will continuously generate heat, the ambient temperature in the target space will rise, which may affect the normal operation of the data center. Therefore, the cooling system in the present application is configured in the target space where the data center is located, and the operation of the cooling system is controlled according to the method provided in the present application, which can reduce the temperature in the target space. The cooling system in the embodiments of the present application can also be applied in other scenarios. For example, the cooling system in the present application is configured in a canteen, a breeding farm, a vegetable and fruit warehouse and the like, and the operation of the cooling system is controlled according to the method provided in the present application, so as to reduce the air temperature in the canteen, the breeding farm, the vegetable and fruit warehouse and the like.

[0032] Figure 2 is a flow chart of a control method of a cooling system provided in the embodiments of the present application. Referring to Figure 2 , the embodiments include:

[0033] 201, the control device acquires the return air temperature in the target space, the temperature of the target air and the target refrigerating capacity in the case that the cooling system is in the first working mode, the target air being used for heat exchange with the return air in the target space.

[0034] The cooling system is a system for cooling the target space. Optionally, the cooling system is an indirect evaporative cooling system, which is a system for cooling by indirect evaporative cooling technology (IEC). The indirect evaporative cooling technology refers to a technology for realizing equal-wetness cooling of primary air by transferring the cold energy of secondary air obtained by direct evaporative cooling to the primary air to be cooled through a non-direct contact heat exchanger. In the embodiments of the present application, the return air in the target space is the primary air, and the target air used for heat exchange with the return air in the target space is the secondary air.

[0035] The cooling system comprises various working modes, such as a dry mode, a wet mode, and a mixed mode. In the dry mode, the cooling capacity is generated by using the external fan. In the wet mode, the cooling capacity is generated by using the external fan and the spraying device. In the mixed mode, the cooling capacity is generated by using the external fan, the spraying device, and the compressor. The first working mode is a working mode in which the speed of the external fan in the cooling system is controlled based on the supply air temperature in the target space and the target temperature. The first working mode is the dry mode or the wet mode. In the case where the cooling system is in the dry mode or the wet mode, the control device controls the speed of the external fan based on the supply air temperature in the target space and the target temperature, so as to reduce the difference between the supply air temperature and the target temperature. The supply air temperature refers to the temperature of the air after the indoor return air is heat-exchanged. The target temperature refers to the temperature that needs to be reached after the indoor return air is heat-exchanged. Optionally, the target temperature is the temperature set by the user.

[0036] The target space is any space, such as the space where the data center is located, the dining hall, the warehouse, the classroom, and the like. The present application does not limit the target space. The return air temperature refers to the temperature of the return air in the target space. The target air is used for heat exchange with the return air in the target space. The target air is the air outside the target space or the air obtained after the air outside the target space is sprayed. The target cooling capacity refers to the heat that needs to be removed from the target space by the cooling system per unit time.

[0037] 202. The control device determines the first speed of the external fan based on the return air temperature, the temperature of the target air, and the target cooling capacity. The first speed is the speed that meets the target cooling capacity.

[0038] The first speed that meets the target cooling capacity means that the cooling capacity generated by the cooling system when the external fan operates at the first speed is the target cooling capacity.

[0039] 203. The control device controls the cooling system to switch to the second working mode when the speed of the external fan is greater than the first speed. The speed of the external fan in the second working mode is lower than that in the first working mode.

[0040] Compared with the first working mode, the second working mode can achieve a higher cooling capacity, because the number of devices that generate the cooling capacity in the second working mode is greater than that in the first working mode. For example, the first working mode is the dry mode, and the device that generates the cooling capacity in the dry mode is the external fan. The second working mode is the wet mode, and the device that generates the cooling capacity in the wet mode includes the external fan and the spraying device. For another example, the first working mode is the wet mode, and the second working mode is the mixed mode. The device that generates the cooling capacity in the mixed mode includes the external fan, the spraying device, and the compressor.

[0041] It should be noted that, although the second working mode increases the device to generate the refrigeration capacity compared with the first working mode, since the increased device and the external fan jointly bear the refrigeration capacity, the rotation speed of the external fan will be reduced, so that the part of power consumption wasted due to the rotation speed overshoot of the external fan can be saved, thereby improving the energy efficiency of the cooling system.

[0042] In the embodiment of the application, since the first rotation speed is the rotation speed determined based on the return air temperature and the temperature of the target air to meet the target refrigeration capacity, the rotation speed of the external fan is greater than the first rotation speed, which indicates that the external fan has an overshoot phenomenon, i.e., the rotation speed of the external fan exceeds the required rotation speed, which indicates that part of the power consumption of the cooling system is wasted. Therefore, in the case where the rotation speed of the external fan is greater than the first rotation speed, the cooling system is switched from the first working mode to the second working mode to reduce the rotation speed of the external fan, so that the power consumption waste can be avoided, thereby improving the energy efficiency of the cooling system.

[0043] Figure 3 is a flow chart of a control method of a cooling system provided by the embodiment of the application. Referring to Figure 3 , the embodiment includes:

[0044] 301. The control device acquires the return air temperature in the target space, the temperature of the air outside the target space, and the target refrigeration capacity in the case where the cooling system is in the dry mode.

[0045] The air outside the target space is used for heat exchange with the return air in the target space to reduce the temperature of the return air in the target space. Optionally, the return air temperature in the target space, the temperature of the air outside the target space, and the target refrigeration capacity are acquired by the control device in real time, i.e., the return air temperature in the target space, the temperature of the air outside the target space, and the target refrigeration capacity correspond to the current time.

[0046] Optionally, the cooling system includes a plurality of sensors, and the control device acquires the return air temperature in the target space and the temperature of the air outside the target space based on the sensors. Optionally, a first sensor is located at the return air in the target space and is used for detecting the return air temperature. A second sensor is located outside the target space and is used for detecting the temperature of the air outside the target space. The first sensor and the second sensor are respectively connected with the control device and send the detected return air temperature and the temperature of the air outside the target space to the control device.

[0047] The target refrigeration capacity is the heat that needs to be removed from the target space by the cooling system per unit time. Optionally, the control device acquires the target refrigeration capacity by the following formula (1).

[0048] Q = C * M * (T1 - T2) (1)

[0049] Wherein, Q is the target cooling capacity, C is the specific heat capacity of air, M is the mass of air in the target space, T1 is the return air temperature, and T2 is the target temperature.

[0050] Optionally, the cooling system comprises a data input device through which a user can input data. For example, the user can input the mass of air in the target space, the specific heat capacity of air, and the target temperature. The data input device is connected to the control device, and the control device obtains the mass of air in the target space, the specific heat capacity of air, and the target temperature sent by the data input device. Optionally, the user can also manually input the target cooling capacity through the data input device, and the control device receives the target cooling capacity sent by the data input device, so that the control device does not need to calculate the target cooling capacity.

[0051] 302. The control device determines a first rotating speed of the outdoor fan based on the return air temperature, the temperature of air outside the target space, and the target cooling capacity, the first rotating speed being a rotating speed that meets the target cooling capacity in the dry mode.

[0052] In a possible implementation, the control device determines the first rotating speed of the outdoor fan based on the return air temperature, the temperature of air outside the target space, and the target cooling capacity, comprising: the control device determines an air volume that meets the target cooling capacity based on a difference between the temperature of air outside the target space and the return air temperature; and the control device determines a first rotating speed of the outdoor fan corresponding to the air volume, the first rotating speed being a rotating speed of the outdoor fan required by the cooling system to meet the target cooling capacity in the dry mode. Optionally, the control device determines the quotient of the target cooling capacity and the difference as the air volume that meets the target cooling capacity. Optionally, the control device stores a correspondence between rotating speeds of the outdoor fan and air volumes, and the control device queries the first rotating speed corresponding to the air volume from the correspondence after obtaining the air volume.

[0053] In a possible implementation, after the control device obtains the first rotating speed of the outdoor fan corresponding to the dry mode, the control device corrects the first rotating speed through simulation testing. That is, the control device selects a plurality of second rotating speeds based on the first rotating speed, a difference between the second rotating speed and the first rotating speed being within a target difference range; the control device performs simulation testing based on each selected second rotating speed, system parameters of the cooling system, the return air temperature, and the temperature of air outside the target space, to obtain a power consumption corresponding to each second rotating speed, wherein the power consumption corresponding to the second rotating speed refers to power consumption of the cooling system when the control device switches the cooling system to the wet mode in a case where the rotating speed of the outdoor fan is greater than the second rotating speed; and the control device determines the second rotating speed with the lowest power consumption as an updated first rotating speed.

[0054] The target difference range is any range, and embodiments of the present application do not limit the target difference range. The number of the selected second rotation speeds is any number, and embodiments of the present application do not limit the number of the selected second rotation speeds. Optionally, the system parameters of the cooling system include parameters of each device in the cooling system, for example, parameters of the inner fan, parameters of the outer fan, parameters of the air heat exchanger, and the like. Optionally, the control device inputs each selected second rotation speed, the system parameters of the cooling system, the return air temperature, and the temperature of the air outside the target space into the simulation test software, runs the simulation test software, and obtains the power consumption corresponding to each second rotation speed output by the simulation test software.

[0055] Optionally, the power consumption corresponding to the second rotation speed includes: power consumption generated by the cooling system within a first time period before the cooling system is controlled to switch to the wet mode in the case that the rotation speed of the outer fan is greater than the second rotation speed, and power consumption generated by the cooling system within a second time period after the cooling system is controlled to switch to the wet mode in the case that the rotation speed of the outer fan is greater than the second rotation speed. The first time period and the second time period are set to any time period as needed, and embodiments of the present application do not limit the first time period and the second time period. In embodiments of the present application, when the power consumption corresponding to the second rotation speed is determined, the power consumption within a period of time before the cooling system switches the working mode and the power consumption within a period of time after the cooling system switches the working mode in the case that the rotation speed of the outer fan is greater than the second rotation speed are comprehensively considered, which can reduce the error of the determined power consumption, so that it can be more accurately compared that in the case that the rotation speed of the outer fan is greater than which second rotation speed, the mode switching can save more power consumption, and thus the switching point at which the energy efficiency of the cooling system is the highest, i.e., the second rotation speed at which the energy efficiency of the cooling system is the highest, is selected.

[0056] In embodiments of the present application, the first rotation speed is a rotation speed required to meet the target cooling capacity and is determined based on the return air temperature and the temperature of the air outside the target space, that is, the first rotation speed is a rotation speed corresponding to the lowest power consumption required by the cooling system when the target cooling capacity is theoretically determined. Considering that there may be a deviation between the rotation speed actually required when the cooling system is running and the first rotation speed, a plurality of second rotation speeds are selected based on the first rotation speed for simulation testing, so as to select the switching point at which the power consumption of the cooling system is the lowest, i.e., the second rotation speed at which the power consumption of the cooling system is the lowest, is updated as the first rotation speed, and the cooling system is controlled based on the first rotation speed, which can ensure that the energy efficiency of the cooling system is the highest.

[0057] In a possible implementation, the control device determines the first rotation speed of the outer fan based on the return air temperature, the temperature of the air outside the target space, and the target cooling capacity, including: the control device queries the first rotation speed corresponding to the return air temperature, the temperature of the air outside the target space, and the target cooling capacity from a database.

[0058] The database stores a corresponding relationship of return air temperature, temperature of air outside the target space, target cooling capacity and the first rotating speed. After the control device obtains the return air temperature, the temperature of air outside the target space and the target cooling capacity, the first rotating speed corresponding to the return air temperature, the temperature of air outside the target space and the target cooling capacity can be obtained from the corresponding relationship.

[0059] Optionally, the corresponding relationship is obtained by the following steps (1) and (2).

[0060] (1) For any return air temperature in the return air temperature range, the corresponding target cooling capacity when the target temperature is each target temperature in the target temperature range is determined.

[0061] For example, the return air temperature range is 30-35 degrees, and the target temperature range is 20-25 degrees. The corresponding target cooling capacity when the target temperature is each temperature in the range of 20-25 degrees is determined for any temperature in the range of 30-35 degrees. It should be noted that when the return air temperature is constant, the target temperature is different, and the corresponding target cooling capacity of the target space is different. When the target temperature is constant, the return air temperature is different, and the corresponding target cooling capacity of the target space is also different. Therefore, the target cooling capacity range can be obtained by the above step (1).

[0062] (2) For any target cooling capacity in the target cooling capacity range and any air temperature in the air temperature range outside the target space, the first rotating speed of the outdoor fan required to meet the target cooling capacity at the air temperature when the return air temperature is each return air temperature in the return air temperature range is determined.

[0063] It should be noted that when the target cooling capacity and the temperature of air outside the target space are constant, the first rotating speed required by the outdoor fan is different when the indoor return air temperature is different. When the target cooling capacity and the return air temperature are constant, the first rotating speed required by the outdoor fan is also different when the temperature of air outside the target space is different. Therefore, the corresponding relationship of "return air temperature-target temperature-target cooling capacity-temperature of air outside the target space-first rotating speed of the outdoor fan" can be obtained by the above step (2).

[0064] The first rotating speed is obtained in step 302, which will not be repeated here. From the method of obtaining the first rotating speed in step 302, it can be determined that the first rotating speed in the corresponding relationship stored in the database is the first rotating speed updated by the second rotating speed obtained by the simulation test, or the first rotating speed without updating, which is not limited by the embodiments of the present application.

[0065] In the embodiment of the present application, the corresponding relationship between the return air temperature, the temperature of the air outside the target space, the target cooling capacity and the first rotating speed of the outdoor fan is stored in the database, so that the control device can directly query the database to obtain the corresponding first rotating speed when the return air temperature, the temperature of the air outside the target space and the target cooling capacity are obtained, without real-time calculation, thereby improving the efficiency of obtaining the first rotating speed.

[0066] Optionally, the first rotating speed is obtained by the control device in real time, that is, the control device obtains the return air temperature in the target space, the temperature of the air outside the target space and the target cooling capacity in real time when the cooling system is in the dry mode, and determines the corresponding first rotating speed in real time, so that the first rotating speed corresponds to the current time.

[0067] 303、the control device controls the cooling system to switch to the wet mode when the rotating speed of the outdoor fan is greater than the first rotating speed, wherein the rotating speed of the outdoor fan in the wet mode is lower than that in the dry mode.

[0068] When the cooling system is in the dry mode, the control device controls the rotating speed of the outdoor fan based on the supply air temperature in the target space and the target temperature, so as to reduce the difference between the supply air temperature and the target temperature. In this process, the outdoor fan may have an overshoot phenomenon, that is, the rotating speed of the outdoor fan exceeds the first rotating speed required to meet the target cooling capacity, which causes part of the power consumption of the outdoor fan to be wasted, thereby reducing the energy efficiency of the cooling system. Therefore, in order to avoid this situation, the control device controls the cooling system to switch to the wet mode when the rotating speed of the outdoor fan is greater than the first rotating speed. Since the spray device and the outdoor fan jointly generate cooling capacity in the wet mode, the rotating speed of the outdoor fan is reduced, so that part of the power consumption wasted due to the overshoot of the outdoor fan is saved, thereby improving the energy efficiency of the cooling system.

[0069] Optionally, the control device controls the rotating speed of the outdoor fan based on the supply air temperature in the target space and the target temperature, so as to reduce the difference between the supply air temperature and the target temperature, including: the control device controls the rotating speed of the outdoor fan in the cooling system based on the PID (Proportion-Integral-Differential) technology, so as to reduce the difference between the supply air temperature and the target temperature.

[0070] Reference Figure 4 When the rotating speed of the outdoor fan is greater than the first rotating speed, the cooling capacity generated by the outdoor fan is greater than the target cooling capacity, and this part of the cooling capacity is wasted. Therefore, when the rotating speed of the outdoor fan is greater than the first rotating speed, the cooling system is controlled to switch the working mode, so that the excessive cooling capacity can be avoided, and the energy efficiency of the cooling system is improved.

[0071] In a possible implementation, the control device controls the cooling system to switch to the wet mode when the rotating speed of the external fan is greater than the first rotating speed, including: the control device controls the cooling system to switch to the wet mode when the rotating speed of the external fan is greater than the first rotating speed for a target duration. The target duration is set to an arbitrary duration as required, and embodiments of the present application do not limit this.

[0072] In the embodiments of the present application, considering the instability of the control when the rotating speed of the external fan is controlled based on the supply air temperature in the target space and the target temperature, the mode switching is performed after the rotating speed of the external fan is greater than the first rotating speed for a period of time, which can accurately determine that the power consumption of the external fan is wasted in the dry mode, and the mode switching in this case can improve the energy efficiency of the cooling system.

[0073] Optionally, the control device obtains the first rotating speed and the rotating speed of the external fan in real time when the cooling system is in the dry mode, and controls the cooling system to switch to the wet mode as soon as it is detected that the rotating speed of the external fan is greater than the first rotating speed.

[0074] 304. The control device obtains the return air temperature in the target space, the temperature of the air after being sprayed by the spraying device in the cooling system, and the target refrigeration capacity when the cooling system is in the wet mode.

[0075] The air after being sprayed is used for heat exchange with the return air in the target space to reduce the temperature of the return air in the target space.

[0076] Optionally, the cooling system includes a sensor for detecting the air after being sprayed, and the control device is connected with the sensor, and the sensor sends the temperature of the air to the control device.

[0077] It should be noted that since the return air temperature in the target space and the target refrigeration capacity can change, the return air temperature in the target space and the target refrigeration capacity are re-obtained after the cooling system switches to the wet mode. The value of the return air temperature can be the same as or different from the value of the return air temperature obtained by the control device in the dry mode, and the value of the target refrigeration capacity can be the same as or different from the value of the target refrigeration capacity obtained by the control device in the dry mode. The implementation of the control device for obtaining the return air temperature and the target refrigeration capacity in the wet mode is the same as the implementation of the control device for obtaining the return air temperature and the target refrigeration capacity in the dry mode, which will not be described herein.

[0078] Optionally, the return air temperature in the target space, the temperature of the air after being sprayed, and the target refrigeration capacity are obtained by the control device in real time, that is, the return air temperature in the target space, the temperature of the air after being sprayed, and the target refrigeration capacity correspond to the current time.

[0079] 305、The control device determines a first rotating speed of the outdoor fan based on the return air temperature, the temperature of the air after being sprayed, and the target cooling capacity, the first rotating speed being a rotating speed that meets the target cooling capacity in the wet mode.

[0080] The control device determines a first rotating speed of the outdoor fan based on the return air temperature, the temperature of the air after being sprayed, and the target cooling capacity, including: the control device determines an air volume that meets the target cooling capacity based on a difference between the temperature of the air after being sprayed and the return air temperature; and the control device determines the first rotating speed of the outdoor fan corresponding to the air volume, the first rotating speed being a rotating speed of the outdoor fan required by the cooling system to meet the target cooling capacity in the wet mode. Optionally, the control device determines the air volume that meets the target cooling capacity as a quotient of the target cooling capacity and the difference. Optionally, the control device stores a corresponding relationship between rotating speeds of the outdoor fan and air volumes, and the control device queries the first rotating speed corresponding to the air volume from the corresponding relationship after obtaining the air volume.

[0081] In a possible implementation, after the control device obtains the first rotating speed of the outdoor fan corresponding to the wet mode, the control device corrects the first rotating speed through simulation testing. That is, the control device selects a plurality of second rotating speeds based on the first rotating speed, a difference between the second rotating speed and the first rotating speed being within a target difference range; the control device respectively performs simulation testing based on each selected second rotating speed, system parameters of the cooling system, the return air temperature, and the temperature of the air after being sprayed, to obtain a power consumption corresponding to each second rotating speed, wherein the power consumption corresponding to the second rotating speed refers to power consumption of the cooling system when the cooling system is switched to the mixed mode in a case where the rotating speed of the outdoor fan is greater than the second rotating speed; and the control device determines the second rotating speed with the lowest power consumption as an updated first rotating speed.

[0082] The target difference range is any range, and embodiments of the present application do not limit the target difference range. The number of the selected second rotating speeds is any number, and embodiments of the present application do not limit the number of the selected second rotating speeds. Optionally, the system parameters of the cooling system include parameters of each device in the cooling system, for example, parameters of the indoor fan, parameters of the outdoor fan, and parameters of the air heat exchanger. Optionally, the control device inputs each selected second rotating speed, the system parameters of the cooling system, the return air temperature, and the temperature of the air after being sprayed into a simulation testing software, and runs the simulation testing software to obtain the power consumption corresponding to each second rotating speed output by the simulation testing software.

[0083] Optionally, the power consumption corresponding to the second rotating speed includes: power consumption of the cooling system in a first time period before the cooling system is controlled to switch to the mixed mode in the case that the rotating speed of the outer fan is greater than the second rotating speed, and power consumption of the cooling system in a second time period after the cooling system is controlled to switch to the mixed mode in the case that the rotating speed of the outer fan is greater than the second rotating speed. The first time period and the second time period are set to any time period as needed, and embodiments of the present application do not limit this. In the embodiments of the present application, when the power consumption corresponding to the second rotating speed is determined, the power consumption in a period of time before the cooling system switches the working mode and the power consumption in a period of time after the working mode is switched are comprehensively considered in the case that the rotating speed of the outer fan is greater than the second rotating speed, which can reduce the error of the determined power consumption, so that the switching point with the highest energy efficiency of the cooling system can be selected, that is, the second rotating speed with the highest energy efficiency of the cooling system is determined.

[0084] In the embodiments of the present application, the first rotating speed is a rotating speed required to meet the target refrigeration capacity and determined based on the return air temperature and the temperature of the air obtained after spraying, that is, the first rotating speed is a rotating speed corresponding to the lowest power consumption required by the cooling system when the target refrigeration capacity is theoretically determined. Considering that there may be a deviation between the rotating speed required when the cooling system actually operates and the first rotating speed, a plurality of second rotating speeds are selected based on the first rotating speed for simulation testing, so as to select the switching point with the lowest power consumption of the cooling system, that is, the second rotating speed with the lowest power consumption of the cooling system, the second rotating speed is updated to the first rotating speed, and the cooling system is controlled based on the first rotating speed, so as to ensure that the energy efficiency of the cooling system is the highest.

[0085] In a possible implementation manner, the control device determines the first rotating speed of the outer fan based on the return air temperature, the temperature of the air obtained after spraying, and the target refrigeration capacity, and the determination includes: the control device queries the first rotating speed corresponding to the return air temperature, the temperature of the air obtained after spraying, and the target refrigeration capacity from a database.

[0086] The database stores a corresponding relationship among the return air temperature, the temperature of the air obtained after spraying, the target refrigeration capacity, and the first rotating speed, and after the control device obtains the return air temperature, the temperature of the air obtained after spraying, and the target refrigeration capacity, the control device can query the first rotating speed corresponding to the return air temperature, the temperature of the air obtained after spraying, and the target refrigeration capacity from the corresponding relationship.

[0087] Optionally, the corresponding relationship is obtained by the following steps (A) and (B).

[0088] (A) For any return air temperature in the return air temperature range, determine the corresponding target cooling capacity when the target temperature is each target temperature in the target temperature range respectively.

[0089] For example, the return air temperature range is 30-35 degrees, and the target temperature range is 20-25 degrees. Then, the corresponding target cooling capacity when the target temperature is each temperature in the range of 20-25 degrees is determined for any temperature in the range of 30-35 degrees. In this way, the target cooling capacity range can be obtained. It should be noted that when the return air temperature is constant, the target temperature is different, and the target cooling capacity corresponding to the target space is also different. When the target temperature is constant, the return air temperature is different, and the target cooling capacity corresponding to the target space is also different. Therefore, the target cooling capacity range can be obtained through the above step (A).

[0090] (B) For any target cooling capacity in the target cooling capacity range and any air temperature in the air temperature range obtained after spraying, determine the first rotating speed of the outdoor fan required to meet the target cooling capacity when the return air temperature is each return air temperature in the return air temperature range respectively.

[0091] It should be noted that when the target cooling capacity and the temperature of the air obtained after spraying are constant, the first rotating speed required by the outdoor fan is different when the indoor return air temperature is different. When the target cooling capacity and the return air temperature are constant, the first rotating speed required by the outdoor fan is also different when the temperature of the air obtained after spraying is different. Therefore, the corresponding relationship of “return air temperature-target temperature-target cooling capacity-temperature of air obtained after spraying-first rotating speed of outdoor fan” can be obtained through the above step (B).

[0092] The first rotating speed is obtained in step 302, which will not be described here. The first rotating speed in the corresponding relationship stored in the database can be determined according to the first rotating speed obtained in step 302, which is the first rotating speed updated by the second rotating speed obtained through the simulation test or the first rotating speed without updating, which is not limited in the embodiments of the present application.

[0093] In the embodiments of the present application, the corresponding relationship between the return air temperature, the temperature of the air obtained after spraying, the target cooling capacity and the first rotating speed of the outdoor fan is stored in the database. When the return air temperature, the temperature of the air obtained after spraying and the target cooling capacity are obtained, the control device can directly query the database to obtain the corresponding first rotating speed, without real-time calculation, so that the efficiency of obtaining the first rotating speed can be improved.

[0094] Optionally, the first rotating speed is acquired by the control device in real time, that is, in the case that the cooling system is in the wet mode, the control device acquires the return air temperature in the target space, the temperature of the air after being sprayed, and the target cooling capacity in real time, and determines the corresponding first rotating speed in real time, so that the first rotating speed corresponds to the current time.

[0095] 306、In the case that the rotating speed of the outdoor fan is greater than the first rotating speed, the control device controls the cooling system to switch to the mixed mode, wherein the rotating speed of the outdoor fan in the mixed mode is lower than that in the wet mode.

[0096] In the case that the cooling system is in the dry mode, the control device controls the rotating speed of the outdoor fan based on the supply air temperature in the target space and the target temperature, so as to make the difference between the supply air temperature and the target temperature smaller. In this process, the outdoor fan may have an overshoot phenomenon, that is, the rotating speed of the outdoor fan exceeds the first rotating speed required to meet the target cooling capacity, which will cause part of the power consumption of the outdoor fan to be wasted, thereby reducing the energy efficiency of the cooling system. Therefore, in order to avoid this situation, the control device controls the cooling system to switch to the mixed mode in the case that the rotating speed of the outdoor fan is greater than the first rotating speed. Since the cooling capacity is generated by the spraying device, the outdoor fan and the compressor in the mixed mode, the rotating speed of the outdoor fan will decrease, so that part of the power consumption wasted due to the overshoot of the outdoor fan can be saved, thereby improving the energy efficiency of the cooling system.

[0097] In a possible implementation, the control device controls the cooling system to switch to the mixed mode in the case that the rotating speed of the outdoor fan is greater than the first rotating speed, comprising: the control device controls the cooling system to switch to the mixed mode in the case that the duration that the rotating speed of the outdoor fan is greater than the first rotating speed reaches a target duration. The target duration is set to any duration as required, and the embodiments of the present application do not limit this.

[0098] In the embodiments of the present application, considering the instability in controlling the rotating speed of the outdoor fan based on the supply air temperature in the target space and the target temperature, the mode switching is performed after the rotating speed of the outdoor fan is greater than the first rotating speed and lasts for a period of time, which can accurately determine that the power consumption of the outdoor fan is wasted in the current wet mode, and the mode switching in this case can improve the energy efficiency of the cooling system.

[0099] Optionally, in the case that the cooling system is in the wet mode, the control device acquires the first rotating speed and the rotating speed of the outdoor fan in real time, and controls the cooling system to switch to the wet mode once it is detected that the rotating speed of the outdoor fan is greater than the first rotating speed.

[0100] It should be noted that the first rotating speed obtained by the control device in the dry mode is actually a switching point corresponding to the dry mode of the cooling system. When the cooling system is in the dry mode, if the rotating speed of the external fan is greater than the first rotating speed, it indicates that the cooling system has reached the switching point, and the control device will control the cooling system to switch to the wet mode. The first rotating speed obtained by the control device in the wet mode is a switching point corresponding to the wet mode of the cooling system. When the cooling system is in the wet mode, if the rotating speed of the external fan is greater than the first rotating speed, it indicates that the cooling system has reached the switching point, and the control device will control the cooling system to switch to the hybrid mode. The values of the first rotating speed obtained by the control device in the dry mode and the first rotating speed obtained by the control device in the wet mode can be the same or different, that is, the switching point corresponding to the dry mode of the cooling system and the switching point corresponding to the wet mode of the cooling system can be the same or different.

[0101] Reference Figure 5 When the target cooling capacity and the return air temperature in the target space are constant, as the air temperature in the target space increases, the rotating speed of the external fan will be increased. When the rotating speed of the external fan is greater than the target cooling capacity, the working mode switching will be performed. When the cooling system is in the dry mode, it will be switched from the dry mode to the wet mode. When the cooling system is in the wet mode, it will be switched from the wet mode to the hybrid mode.

[0102] 307、In the hybrid mode, the control device obtains a third rotating speed of the external fan, and the third rotating speed is a rotating speed corresponding to the lowest power consumption required by the cooling system to meet the target cooling capacity.

[0103] In a possible implementation, the control device obtains the third rotating speed of the external fan, including: the control device determines a first target cooling capacity of the external fan based on the return air temperature, the temperature of the target air, and the target cooling capacity, wherein the power consumption of the cooling system is the lowest when the external fan undertakes the first target cooling capacity and the compressor and the spraying device undertake the remaining cooling capacity; and the control device determines the third rotating speed based on the return air temperature, the temperature of the target air, and the first target cooling capacity, and the third rotating speed is a rotating speed meeting the first target cooling capacity. The target air is air obtained after spraying air outside the target space.

[0104] The implementation manner of determining the third rotating speed by the control device based on the return air temperature, the temperature of the target air, and the first target cooling capacity is the same as the implementation manner of determining the first rotating speed of the external fan by the control device based on the return air temperature, the temperature of the air outside the target space, and the target cooling capacity in the above step 302, and details are not repeated here.

[0105] In the embodiments of the present application, when the cooling system is in the mixed mode, the target refrigerating capacity is borne by the outdoor fan, the spraying device and the compressor together. Considering that the outdoor fan, the spraying device and the compressor have different performances, when the target refrigerating capacity is certain, the first target refrigerating capacity borne by the outdoor fan affects the power consumption of the cooling system, therefore, the first target refrigerating capacity borne by the outdoor fan is determined when the cooling system reaches the lowest power consumption, the third rotating speed of the outdoor fan is determined based on the first target refrigerating capacity, and the operation of the outdoor fan is controlled based on the third rotating speed, which can reduce the power consumption of the cooling system and improve the energy efficiency of the cooling system.

[0106] In a possible implementation, the control device determines the first target refrigerating capacity of the outdoor fan based on the return air temperature, the temperature of the target air and the target refrigerating capacity, including: the control device divides the target refrigerating capacity according to a plurality of division ratios to obtain a plurality of division results, each of which includes at least the refrigerating capacity allocated to the outdoor fan; the control device performs simulation tests based on the refrigerating capacity of the outdoor fan in the division result corresponding to each division ratio, the target refrigerating capacity, the system parameters of the cooling system, the return air temperature and the temperature of the target air to obtain the power consumption of the cooling system corresponding to each division ratio; the control device determines the target division ratio corresponding to the lowest power consumption; and the refrigerating capacity of the outdoor fan in the division result corresponding to the target division ratio is determined as the first target refrigerating capacity of the outdoor fan. The number of division ratios is arbitrary, and the embodiments of the present application do not limit the number of division ratios.

[0107] Optionally, the division ratio is the ratio of the refrigerating capacity allocated to the outdoor fan to the target refrigerating capacity. For example, the division ratio is 1:10, indicating that the refrigerating capacity allocated to the outdoor fan accounts for one tenth of the target refrigerating capacity. Optionally, the division ratio is the ratio of the refrigerating capacity allocated to the outdoor fan to the refrigerating capacity allocated to the compressor and the spraying device. For example, the division ratio is 3:7, indicating that the refrigerating capacity allocated to the outdoor fan accounts for three tenths of the target refrigerating capacity, and the refrigerating capacity allocated to the compressor and the spraying device accounts for seven tenths of the target refrigerating capacity. Optionally, the division result only includes the refrigerating capacity allocated to the outdoor fan, or the division result includes the refrigerating capacity allocated to the outdoor fan and the refrigerating capacity allocated to the compressor and the spraying device.

[0108] In the embodiments of the present application, the target refrigerating capacity is divided according to a plurality of division ratios to obtain a plurality of division results, and the simulation test is performed on the refrigerating capacity allocated to the outdoor fan in each division result, which can accurately determine the refrigerating capacity of the outdoor fan that makes the power consumption of the cooling system the lowest.

[0109] In a possible implementation, the control device determines the first target refrigerating capacity of the outdoor fan based on the return air temperature, the temperature of the target air and the target refrigerating capacity, including: the control device queries the first target refrigerating capacity of the outdoor fan corresponding to the return air temperature, the temperature of the target air and the target refrigerating capacity from a database.

[0110] Optionally, for each target refrigerating capacity in the target refrigerating capacity range, a first target refrigerating capacity corresponding to each target refrigerating capacity is obtained by the above simulation test method. Wherein, for the first target refrigerating capacity corresponding to each target refrigerating capacity, in the case that the outdoor fan bears the first target refrigerating capacity and the spraying device and the compressor bear the remaining refrigerating capacity, the cooling system has the lowest power consumption to generate the target refrigerating capacity. Then the correspondence between each target refrigerating capacity and the first target refrigerating capacity is stored in the database, so that the control device can directly query the first target refrigerating capacity of the outdoor fan corresponding to the return air temperature, the target air temperature and the target refrigerating capacity from the correspondence after obtaining the return air temperature, the target air temperature and the target refrigerating capacity.

[0111] In the embodiment of the present application, by storing the correspondence between the return air temperature, the target air temperature, the target refrigerating capacity and the first target refrigerating capacity of the outdoor fan in the database, the control device can directly query the corresponding first target refrigerating capacity from the database after obtaining the return air temperature, the target air temperature and the target refrigerating capacity, without the need to perform real-time simulation test to obtain the first target refrigerating capacity, thereby improving the efficiency of obtaining the first target refrigerating capacity.

[0112] 308、In the process of controlling the speed of the outdoor fan in the cooling system to make the difference between the condensing pressure of the compressor in the cooling system and the target pressure smaller based on the condensing pressure of the compressor in the cooling system and the target pressure in the mixed mode, the control device controls the speed of the outdoor fan not to exceed the third speed.

[0113] In the case that the cooling system is in the mixed mode, the control device will control the speed of the outdoor fan in the cooling system based on the condensing pressure of the compressor in the cooling system and the target pressure, so as to make the difference between the condensing pressure and the target pressure smaller. Optionally, the control device controls the speed of the outdoor fan in the cooling system based on the PID technology, so as to make the difference between the condensing pressure and the target pressure smaller.

[0114] One thing that needs to be explained is that when the cooling system is in mixed mode, the cooling capacity is jointly generated by the external fan, the spray device and the compressor, and the cooling capacity is mainly generated by the compressor. The main function of the external fan is to dissipate heat to the compressor to ensure the normal operation of the compressor. At the same time, the external fan can also generate cooling capacity to reduce the temperature in the target space. After entering the mixed mode, since the compressor has just entered the working state, the temperature of the compressor condenser is not high, and the speed of the external fan is relatively low at this time. As the working time of the compressor increases, the temperature of the condenser will increase, causing the condensing pressure of the compressor to increase. In this case, the speed of the external fan will increase to reduce the temperature of the condenser, thereby reducing the condensing pressure of the compressor, so that the difference between the condensing pressure and the target pressure will not be greater than the pressure threshold. Among them, when the difference between the condensing pressure and the target pressure is not greater than the pressure threshold, the compressor is in normal working condition.

[0115] Another point to note is that the reference Figure 6 When the cooling system is in mixed mode, when the target cooling capacity is constant, as the speed of the external fan increases, the power consumption of the external fan will increase, the power consumption of the compressor will decrease, and the power consumption of the cooling system will also decrease. When the speed of the external fan is equal to the third speed, the power consumption of the cooling system is the lowest. When the speed of the external fan continues to increase, the power consumption of the cooling system will increase. In other words, when the speed of the external fan exceeds the third speed, the higher the speed of the external fan, the lower the energy efficiency of the cooling system. Continue to refer to Figure 6 , when the target cooling capacity is constant, as the speed of the external fan increases, the cooling load factor (CLF) of the data center will decrease. When the speed of the external fan is equal to the third speed, the cooling load factor of the data center is the smallest. When the speed of the external fan continues to increase, the cooling load factor of the data center will become larger. The cooling load factor is the ratio of the power consumption of the refrigeration equipment to the power consumption of the IT equipment in the target space. The smaller the value, the higher the energy efficiency. Therefore, in an embodiment of the present application, when controlling the speed of the external fan in the cooling system based on the condensing pressure and the target pressure of the compressor in the cooling system, controlling the speed of the external fan not to exceed the third speed can make the external fan at a speed that makes the energy efficiency of the cooling system high, thereby ensuring the high energy efficiency of the cooling system.

[0116] refer to Figure 7, the target refrigerating capacity corresponds to the horizontal coordinate value 7, and the rotation speed required for the cooling system to meet the target refrigerating capacity is 56000. When the rotation speed of the external fan is greater than 56000, the refrigerating capacity generated by the external fan is greater than the target refrigerating capacity, and this part of the refrigerating capacity is wasted. Therefore, in the case where the rotation speed of the external fan is greater than 56000, the cooling system is controlled to switch the working mode, so that the excessive refrigerating capacity can be avoided, and the energy efficiency of the cooling system can be improved. If the working mode is switched only when the rotation speed of the external fan reaches the maximum value 68000, the energy efficiency of the system will be reduced. Figure 7 As can be seen from the above, compared with switching the mode when the rotation speed of the external fan reaches the maximum value, switching the mode when the rotation speed of the external fan is greater than 56000 has a smaller refrigeration load coefficient, indicating that the energy efficiency of the cooling system is higher.

[0117] It should be noted that the above steps 301-303 are described by taking the first working mode as the dry mode, the second working mode as the wet mode, and the target air as the air outside the target space as an example. The control mode of the cooling system is described. The above steps 304-306 are described by taking the first working mode as the wet mode, the second working mode as the mixed mode, and the target air as the air obtained by spraying the air outside the target space as an example. The control mode of the cooling system is described. In other embodiments, the above steps 301-303 are not performed, or the above steps 304-308 are not performed, or the above steps 307-308 are not performed.

[0118] In the embodiments of the present application, since the first rotation speed is the rotation speed required to meet the target refrigerating capacity based on the return air temperature and the temperature of the target air, when the rotation speed of the external fan is greater than the first rotation speed, it indicates that the external fan has an overshoot phenomenon, that is, the rotation speed of the external fan exceeds the required rotation speed, which means that part of the power consumption of the cooling system is wasted. Therefore, in the case where the rotation speed of the external fan is greater than the first rotation speed, the first working mode is switched to the second working mode to reduce the rotation speed of the external fan, so that the power consumption can be avoided, and the energy efficiency of the cooling system can be improved.

[0119] In the embodiments of the present application, the first rotation speed is the rotation speed required to meet the target refrigerating capacity based on the return air temperature and the temperature of the target air, that is, the first rotation speed is the rotation speed corresponding to the lowest power consumption of the cooling system in theory when the target refrigerating capacity is met. Considering that there may be a deviation between the actual rotation speed required when the cooling system is running and the first rotation speed, a plurality of second rotation speeds are selected based on the first rotation speed for simulation testing, so as to select the switching point at which the power consumption of the cooling system is the lowest, that is, the second rotation speed at which the power consumption of the cooling system is the lowest is updated as the first rotation speed. The cooling system is controlled based on the first rotation speed, so that the energy efficiency of the cooling system can be guaranteed to be the highest.

[0120] In the embodiment of the present application, the corresponding relationship between the return air temperature, the temperature of the air outside the target space, the target cooling capacity and the first rotating speed of the outdoor fan is stored in the database, so that the control device can directly query the database to obtain the corresponding first rotating speed when the return air temperature, the temperature of the air outside the target space and the target cooling capacity are obtained, without real-time calculation, thereby improving the efficiency of obtaining the first rotating speed.

[0121] In the embodiment of the present application, the instability of control is considered when the rotating speed of the outdoor fan is controlled based on the supply air temperature in the target space and the target temperature, so that the mode switching is performed after the rotating speed of the outdoor fan is greater than the first rotating speed and lasts for a period of time, the waste of power consumption of the outdoor fan in the current working mode can be accurately determined, and the mode switching in this case can improve the energy efficiency of the cooling system.

[0122] In the embodiment of the present application, when the cooling system is in the mixed mode, the outdoor fan, the spraying device and the compressor jointly bear the target cooling capacity. Considering that the outdoor fan, the spraying device and the compressor have different performances, when the target cooling capacity is certain, the size of the first target cooling capacity borne by the outdoor fan will affect the power consumption of the cooling system, therefore, the first target cooling capacity borne by the outdoor fan when the cooling system reaches the lowest power consumption is determined, the third rotating speed of the outdoor fan is determined based on the first target cooling capacity, and the operation of the outdoor fan is controlled based on the third rotating speed, thereby reducing the power consumption of the cooling system and improving the energy efficiency of the cooling system.

[0123] In the embodiment of the present application, the target cooling capacity is divided according to a plurality of division ratios to obtain a plurality of division results, and the cooling capacity of the outdoor fan in each division result is simulated and tested, thereby accurately determining the cooling capacity of the outdoor fan that makes the power consumption of the cooling system lowest.

[0124] In the embodiment of the present application, the corresponding relationship between the return air temperature, the temperature of the target air, the target cooling capacity and the first target cooling capacity of the outdoor fan is stored in the database, so that the control device can directly query the database to obtain the corresponding first target cooling capacity when the return air temperature, the temperature of the target air and the target cooling capacity are obtained, without real-time simulation test to obtain the first target cooling capacity, thereby improving the efficiency of obtaining the first target cooling capacity.

[0125] All the optional technical solutions described above can be combined to form optional embodiments of the present application, which will not be described here.

[0126] The embodiment of the present application further provides a cooling system, which comprises a control device and an air heat exchanger, an inner fan, an outer fan, a spraying device and a compressor connected with the control device, and the control device is used for controlling the air heat exchanger, the inner fan, the outer fan, the spraying device and the compressor to reduce the temperature in a target space; the control device comprises a processor and a memory, and at least one computer program is stored in the memory, the computer program is loaded and executed by the processor to realize the operation performed in the control method of the cooling system of the above-mentioned embodiment.

[0127] The embodiment of the present application further provides a computer readable storage medium, which stores at least one computer program, and the at least one computer program is loaded and executed by a processor to realize the operation performed in the control method of the cooling system of the above-mentioned embodiment.

[0128] The embodiment of the present application further provides a computer program product or a computer program, which comprises a computer program stored in a computer readable storage medium. A processor of a computer device reads the computer program from the computer readable storage medium, and the processor executes the computer program, so that the computer device executes the operation performed in the control method of the cooling system in the above-mentioned various optional implementation manners.

[0129] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or by a program instructing related hardware to complete, and the program can be stored in a computer readable storage medium, and the storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk.

[0130] The above-mentioned is only optional embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A control method of a cooling system, characterized by, The cooling system is used to reduce the temperature in a target space, and the method comprises: When the cooling system is in a first working mode, obtaining a return air temperature in the target space, a target air temperature, and a target cooling capacity, the target air being used for heat exchange with the return air in the target space, the first working mode being a working mode in which the speed of an outdoor fan in the cooling system is controlled based on a supply air temperature in the target space and a target temperature; Based on the return air temperature, the target air temperature, and the target cooling capacity, determining a first speed of the outdoor fan, the target cooling capacity being the amount of heat that needs to be removed from the target space by the cooling system per unit time, the first speed being the speed corresponding to the minimum power consumption required by the cooling system to meet the target cooling capacity; When the speed of the outdoor fan is greater than the first speed, controlling the cooling system to switch to a second working mode, wherein the speed of the outdoor fan in the second working mode is lower than that in the first working mode.

2. The method of claim 1, wherein, The first working mode is a dry mode, and the target air is air outside the target space, and the second working mode is a wet mode, and the method of determining the first speed of the outdoor fan based on the return air temperature, the target air temperature, and the target cooling capacity comprises: Determining the air volume that meets the target cooling capacity based on the difference between the air temperature outside the target space and the return air temperature; Determining the first speed of the outdoor fan corresponding to the air volume.

3. The method of claim 1, wherein, The first working mode is a wet mode, and the target air is air obtained by spraying air outside the target space with a spraying device in the cooling system, and the second working mode is a hybrid mode, and the method of determining the first speed of the outdoor fan based on the return air temperature, the target air temperature, and the target cooling capacity comprises: Determining the air volume that meets the target cooling capacity based on the difference between the temperature of the air obtained by spraying and the return air temperature; Determining the first speed of the outdoor fan corresponding to the air volume.

4. The method of claim 1, wherein, After determining the first speed of the outdoor fan based on the return air temperature, the target air temperature, and the target cooling capacity, the method further comprises: Selecting a plurality of second speeds based on the first speed, the difference between the first speed and the second speed being within a target difference range; Performing simulation tests based on each selected second speed, system parameters of the cooling system, the return air temperature, and the target air temperature, respectively, to obtain the power consumption corresponding to each second speed, wherein the power consumption corresponding to the second speed refers to the power consumption of the cooling system when the speed of the outdoor fan is greater than the second speed and the cooling system is controlled to switch to the second working mode; Determining the second speed with the lowest power consumption as the updated first speed.

5. The method of claim 1, wherein, The method of determining the first speed of the outdoor fan based on the return air temperature, the target air temperature, and the target cooling capacity comprises: query, from a database, the first rotating speed corresponding to the return air temperature, the target air temperature, and the target refrigerating capacity.

6. The method of claim 1, wherein, In a case where the rotating speed of the external fan is greater than the first rotating speed, the cooling system is controlled to switch to a second working mode, including: In a case where the rotating speed of the external fan is greater than the first rotating speed for a duration reaching a target duration, the cooling system is controlled to switch to the second working mode.

7. The method of claim 1, wherein, The first working mode is a wet mode, and the second working mode is a mixed mode. After the cooling system is controlled to switch to the second working mode in a case where the rotating speed of the external fan is greater than the first rotating speed, the method further includes: In the second working mode, based on a condensing pressure of a compressor in the cooling system and a target pressure, a rotating speed of an external fan in the cooling system is controlled to make a difference between the condensing pressure and the target pressure smaller.

8. The method of claim 7, wherein, Before the rotating speed of the external fan is controlled based on the condensing pressure of the compressor in the cooling system and the target pressure to make the difference between the condensing pressure and the target pressure smaller, the method further includes: obtaining a third rotating speed of the external fan, the third rotating speed being a rotating speed corresponding to a minimum power consumption required by the cooling system to meet the target refrigerating capacity; The rotating speed of the external fan is controlled based on the condensing pressure of the compressor in the cooling system and the target pressure to make the difference between the condensing pressure and the target pressure smaller, including: During the process of controlling the rotating speed of the external fan based on the condensing pressure of the compressor in the cooling system and the target pressure to make the difference between the condensing pressure and the target pressure smaller, the rotating speed of the external fan does not exceed the third rotating speed.

9. The method of claim 8, wherein, The obtaining of the third rotating speed of the external fan includes: determining a first target refrigerating capacity of the external fan based on the return air temperature, the target air temperature, and the target refrigerating capacity, wherein, in a case where the external fan undertakes the first target refrigerating capacity and a compressor and a spraying device in the cooling system undertake a remaining refrigerating capacity, a power consumption of the cooling system is the lowest; determining the third rotating speed based on the return air temperature, the target air temperature, and the first target refrigerating capacity, the third rotating speed being a rotating speed meeting the first target refrigerating capacity.

10. The method of claim 9, wherein, The determination of the first target refrigerating capacity of the external fan based on the return air temperature, the target air temperature, and the target refrigerating capacity includes: dividing the target refrigerating capacity according to a plurality of division ratios to obtain a plurality of division results, each division result including at least a refrigerating capacity allocated to the external fan; performing simulation testing based on the refrigerating capacity of the external fan in each division result corresponding to each division ratio, the target refrigerating capacity, system parameters of the cooling system, the return air temperature, and the target air temperature to obtain a power consumption of the cooling system corresponding to each division ratio; determining a target division ratio corresponding to a lowest power consumption; and controlling the rotating speed of the external fan based on the condensing pressure of the compressor in the cooling system and the target pressure to make the difference between the condensing pressure and the target pressure smaller. The refrigerating capacity of the outdoor fan in the division result corresponding to the target division ratio is determined as a first target refrigerating capacity of the outdoor fan.

11. The method of claim 9, wherein, The first target refrigerating capacity of the outdoor fan is determined based on the return air temperature, the target air temperature, and the target refrigerating capacity. The first target refrigerating capacity of the outdoor fan corresponding to the return air temperature, the target air temperature, and the target refrigerating capacity is queried from a database.

12. A cooling system characterized by, The cooling system comprises a control device, and an air heat exchanger, an indoor fan, an outdoor fan, a spraying device, and a compressor connected to the control device, wherein the control device is configured to control the air heat exchanger, the indoor fan, the outdoor fan, the spraying device, and the compressor to reduce the temperature in a target space. The control device comprises a processor and a memory, and the memory stores at least one computer program, which is loaded and executed by the processor to implement the operations performed by the control method of the cooling system according to any one of claims 1 to 11.

13. A computer-readable storage medium, characterized in that, The storage medium stores at least one computer program, which is loaded and executed by the processor to implement the operations performed by the control method of the cooling system according to any one of claims 1 to 11.

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