An indirect evaporative cooling system and its control method

Abstract

This application relates to an indirect evaporative cooling system and control method, comprising a heat exchanger including a first air inlet, a first air outlet, a second air inlet, a second air outlet, and a heat exchange core, the heat exchange core including a first airflow channel and a second airflow channel; an internal circulation fan coil assembly, located on one side of the first air outlet, including a first surface cooler and a first fan; and an external circulation fan coil assembly, located on one side of the second air outlet; a cold source storage tank connected to the input end of the first surface cooler, the cold source storage tank containing insulation material, used to store external cold sources at night or during off-peak hours and to release the stored cold sources to the first surface cooler for supplemental cooling during daytime or peak hours via connecting pipelines; and a spray assembly, located on one side of the second air inlet, used to cool the airflow entering the heat exchanger through the second air inlet. This application has the effect of reducing the operating energy consumption of the indirect evaporative cooling system.

Description

Technical Field

[0001] This application relates to the field of cooling systems, and more particularly to an indirect evaporative cooling system and control method. Background Technology

[0002] Indirect evaporative cooling systems refer to the process of transferring the cooling capacity of humid air (secondary air) obtained from direct evaporative cooling systems to the air to be treated (primary air) through a non-direct contact heat exchanger to achieve equal humidity cooling of the air. They are typically suitable for cooling in data centers, workshops, and other fields.

[0003] Existing indirect evaporative cooling systems focus on using air as a cold source and water evaporation to absorb heat and remove it. They achieve cooling through heat and moisture exchange between air and water, and exchange heat with the hot air in the data center via an air heat exchange core, avoiding direct contact and thus preventing air pollution and humidity impacts. However, indirect evaporative cooling systems have a drawback: insufficient cooling capacity in high-temperature and high-humidity environments. Therefore, additional cooling is required. Traditional indirect evaporative air conditioners mostly use compressor-based cooling solutions, which have high energy consumption and operating costs. Summary of the Invention

[0004] To reduce the operating energy consumption of indirect evaporative cooling systems, this application provides an indirect evaporative cooling system and its control method.

[0005] The indirect evaporative cooling system provided in this application adopts the following technical solution:

[0006] In a first aspect, this application provides an indirect evaporative cooling system, comprising:

[0007] A heat exchanger, comprising a first air inlet, a first air outlet, a second air inlet, a second air outlet, and a heat exchange core, wherein the heat exchange core comprises a first airflow channel and a second airflow channel, the first airflow channel connecting the first air inlet and the first air outlet, and the second airflow channel connecting the second air inlet and the second air outlet, wherein the first airflow channel and the second airflow channel are spaced apart and independent of each other;

[0008] An internal circulation fan coil unit assembly, wherein the internal circulation fan coil unit assembly is located on one side of the first air outlet, and the internal circulation fan coil unit assembly includes a first surface cooler and a first fan; and an external circulation fan coil unit assembly, wherein the external circulation fan coil unit assembly is located on one side of the second air outlet.

[0009] A cold source energy storage tank is connected to the input end of the first surface cooler. The cold source energy storage tank is filled with insulation material. The cold source energy storage tank is used to store external cold sources at night or during off-peak hours and to release the stored cold sources to the first surface cooler for supplemental cooling during daytime or peak hours through connecting pipelines.

[0010] A spray assembly is disposed on one side of the second air inlet, and the spray assembly is used to cool the airflow entering the heat exchanger through the second air inlet.

[0011] By adopting the above technical solution, a cold source energy storage tank is used to replace the air compressor to supplement the heat exchanger's heat exchange cycle. The cold source energy storage tank is used to store external cold sources at night or during off-peak hours and input external cold sources to the first surface cooler during peak hours according to the temperature data of the factory or data center to assist the heat exchanger in heat exchange and reduce energy consumption.

[0012] Preferably, the cold source energy storage tank includes a tank body, several insulation panels, and a first temperature sensor. The insulation panels divide the tank body into several independent storage spaces. An external cold source is stored in the storage space and released to the first surface cooler in stages through an electrically controlled valve corresponding to each storage space. The first temperature sensor controls the temperature of each storage space to be different, and the temperature in the storage space gradually decreases along the height direction of the tank body.

[0013] By adopting the above technical solution, the tank is divided into several independent storage spaces for storing external cold sources. The external cold sources are input into the storage spaces at night or during off-peak hours and stored for use during the day or peak hours. Furthermore, the temperature in each storage space is different, which facilitates tiered storage. When releasing, the cold sources are released in stages according to demand. The amount of external cold source released in each storage space can be controlled by controlling the opening of the electrically controlled valve.

[0014] Preferably, the storage space is connected to an external water source, groundwater, or a heat recovery device. The heat recovery device includes a capture component for capturing waste heat and a conversion component for converting waste heat into an external cold source. A liquid level detector is installed inside the tank. When the liquid level inside the tank is lower than a first liquid level threshold, an external cold source is delivered to the storage space.

[0015] By adopting the above technical solutions, external water sources or groundwater can be used as external cold sources, which is cost-effective and energy-efficient. The storage space can also be connected to a heat recovery device, which can capture the heat energy of the factory or data center and convert it into an external cold source before transporting it to the cold source storage tank for storage. Waste heat can be recovered and reused, making it even more energy-efficient.

[0016] Preferably, the capture assembly includes a rotating shaft, a rotating mesh mounted on the rotating shaft and made of interwoven fine hot wires, and a drive member for driving the rotating shaft to rotate. The rotating shaft is hollow inside and connected to the conversion assembly for conveying the waste heat captured by the rotating mesh to the conversion assembly.

[0017] By adopting the above technical solution, the hot wire has good thermal conductivity and can quickly absorb waste heat in the room. The driving component drives the rotating mesh to rotate, continuously transferring the absorbed waste heat to the heat recovery device, realizing continuous and efficient waste heat capture. The heat absorbed on the heat absorption wire is transferred to the rotating shaft and then to the conversion component through the heat transfer effect, thereby converting it into a cold source and providing it to the cold source energy storage tank.

[0018] Preferably, the heat recovery device further includes a device body, and the conversion component includes a spiral rotating pipe rotatably disposed inside the device body. The rotating pipe contains a cooling medium and is connected to the rotating shaft. The driving component simultaneously drives the rotating shaft and the rotating pipe to rotate.

[0019] By adopting the above technical solution, a spiral-shaped rotating pipe is constructed, in which waste heat and cooling medium flow. Through the rotation, the waste heat continuously changes its flow direction within the spiral channel, enhancing the mixing and heat exchange effect with the cooling medium. The number of spiral turns and the spacing of the rotating pipe can be adjusted as needed to optimize heat recovery performance.

[0020] Preferably, the device body has a top plate, the capture component is disposed on the top plate, the conversion component is disposed in the space inside the device body, and the driving component includes a drive motor, a transmission wheel and a transmission belt respectively arranged on the output shaft of the rotating motor and the rotating shaft.

[0021] By adopting the above technical solution, the rotating mesh and rotating pipe are driven to rotate together through the transmission of the drive wheel and belt, so as to realize the capture and conversion of waste heat simultaneously.

[0022] Preferably, the rotating pipe includes a main pipe connected to the rotating shaft and several branch pipes arranged parallel to the main pipe, and the several branch pipes are connected to the main pipe through horizontal pipes that intersect in a cross shape.

[0023] By adopting the above technical solution and setting up multiple rotating pipes, the conversion efficiency is improved.

[0024] Secondly, this application provides a control method for an indirect evaporative cooling system, employing the following technical solution:

[0025] A control method for an indirect evaporative cooling system, applied to the indirect evaporative cooling system, characterized by comprising the following steps:

[0026] When the cooling demand is less than the first demand threshold and the outdoor temperature is less than the first temperature threshold, only the internal circulation fan coil unit and the external circulation fan coil unit are activated for heat exchange.

[0027] When the cooling demand is greater than the second demand threshold or the outdoor temperature is greater than the first demand temperature threshold, the spray assembly is turned on to assist in heat exchange; when the cooling demand is less than the minimum threshold and the outdoor temperature is less than the second temperature threshold, the spray assembly is turned off.

[0028] When the cooling demand exceeds the maximum demand threshold, the spray assembly is activated and the cold source energy storage tank is started to assist in cooling.

[0029] When the cooling demand exceeds the maximum demand threshold and the spray assembly cannot be turned on, the cold source energy storage tank is activated to assist in cooling.

[0030] By adopting the above technical solution, when the cooling demand is less than the first demand threshold and the outdoor temperature is less than the first temperature threshold, it means that the load is low, the temperature of the first airflow channel is low, and pure heat exchange is sufficient to meet the cooling demand. Only the operation of the internal circulation fan coil unit and the external circulation fan coil unit is sufficient to meet the demand. When the cooling demand is greater than the second demand threshold, the load is high, the temperature of the first airflow channel rises, the cooling demand rises, the speed of the external circulation fan coil unit increases, and pure heat exchange cannot meet the cooling demand when the outdoor temperature is greater than the first temperature threshold. The spray system is activated to assist in heat exchange. After the spray system is activated, the temperature of the first airflow channel continues to decrease, the cooling demand gradually decreases, and the speed of the external circulation fan coil unit gradually decreases. If the outdoor temperature is lower than the second temperature threshold, the spray system is turned off, and the previous pure heat exchange mode is resumed. When the cooling demand further increases and exceeds the maximum demand threshold, it indicates a higher load. If the temperature of the first airflow channel continues to rise even with the spray system activated, the cold source energy storage tank is activated for auxiliary cooling. When the cooling demand continues to decrease to below the minimum demand threshold, the cold source energy storage tank is turned off. If the spray system fails to activate and the load is high, pure heat exchange cannot meet the cooling demand, so the cold source energy storage tank is activated for supplemental cooling.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. This application uses a cold source energy storage tank to store external cold sources at night or during off-peak hours and deliver the external cold sources to the first surface cooler for supplemental cooling during the day or during peak hours according to the indoor cooling demand, thereby saving energy.

[0033] 2. This application achieves indoor waste heat recovery by setting up a heat recovery device to collect indoor waste heat, and then converts the heat into an external cold source of a certain temperature through a conversion component and delivers it to the cold source energy storage tank, thereby reducing the indoor temperature and achieving rapid heat dissipation.

[0034] 3. By setting up a rotating mesh with high thermal conductivity to absorb heat and transfer it to a rotating pipe, the waste heat is cooled down by the cooling medium inside the rotating pipe and converted into an external cold source, thus realizing the capture and conversion of indoor waste heat. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the indirect evaporative cooling system of this application.

[0036] Figure 2 This is a schematic diagram of the cross-sectional structure of a cold source energy storage tank.

[0037] Figure 3 This is a schematic diagram of the overall structure of the heat recovery device.

[0038] Figure 4 This is a cross-sectional structural diagram of the heat recovery device.

[0039] Explanation of reference numerals in the attached drawings: 1. Heat exchanger; 11. Heat exchange core; 12. Indoor side air inlet direction; 13. Indoor side air outlet direction; 14. Outdoor side air inlet direction; 15. Outdoor side air outlet direction; 2. Internal circulation fan coil unit assembly; 21. First surface cooler; 22. First fan; 3. External circulation fan coil unit assembly; 31. Second surface cooler; 32. Second fan; 4. Cold source energy storage tank; 41. Tank body; 42. Insulation panel; 43. First temperature sensor; 44. Storage space; 4 5. Electrically controlled valve; 5. Heat recovery device; 51. Capture assembly; 511. Rotating shaft; 512. Rotating net; 52. Drive component; 521. Drive motor; 522. Transmission wheel; 523. Transmission belt; 53. Conversion assembly; 531. Rotating pipe; 5311. Main pipe; 5312. Branch pipe; 532. Horizontal pipe; 54. Main body of the device; 541. Top plate; 6. Pipe interface; 7. Conveying pipe; 8. Spray assembly; 9. Water collection tank; 10. Filter cotton. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0041] This application discloses an indirect evaporative cooling system. (Refer to...) Figures 1-4 The indirect evaporative cooling system includes a heat exchanger 1, an internal circulation fan coil unit 2, an external circulation fan coil unit 3, a spray unit 8, a water collection tank 9, and a cold source energy storage tank 4.

[0042] In detail, the heat exchanger 1 includes a heat exchange core 1132, which includes a first air inlet, a first air outlet, a second air inlet and a second air outlet, a first airflow channel and a second airflow channel. The first air inlet draws air from the indoor side, such as... Figure 1 As indicated by number 12, the first air outlet faces the indoor side, such as... Figure 1 As indicated by reference numeral 13, the second air inlet draws air from the outdoor side, as shown. Figure 1 As indicated by reference numeral 14, the second air outlet exhausts air from the outdoor side, such as... Figure 1 In the direction indicated by reference numeral 15, the first airflow channel connects the first air inlet and the first air outlet, and the second airflow channel connects the second air inlet and the second air outlet. The first airflow channel and the second airflow channel are spaced apart and independent of each other. The internal circulation fan coil unit 2 is located on the side of the first air outlet and is used to drive indoor airflow through the first air inlet into the first airflow channel and then into the room through the first air outlet. The external circulation fan coil unit 3 is located on the side of the second air outlet and is used to drive outdoor airflow through the second air inlet into the second airflow channel and then into the room through the second air outlet. The indoor airflow and the outdoor airflow exchange heat in the first airflow channel and the second airflow channel respectively, thereby cooling the indoor airflow. The outdoor airflow carries away some of the heat from the indoor airflow. The first airflow channel and the second airflow channel are spaced apart and independent of each other, so that the indoor airflow and the outdoor airflow only exchange heat but do not mix, ensuring the cleanliness and humidity of the indoor airflow.

[0043] A spray assembly 8 is located on one side of the second air inlet and is used to cool the airflow entering the heat exchanger 1 through the second air inlet. A water collection tank 9 is located below the spray assembly 8 and is connected to an external water source. The water collection tank 9 contains cooling water for use by the spray assembly 8, and any excess water that drips down falls back into the water collection tank 9 for reuse.

[0044] In this application, a filter cotton 10 is provided at the first air inlet. The filter cotton 10 has a higher filtration precision. Since the data center server room is a high-cleanliness space, the filter cotton 10 can purify the air in the data center server room. A filter screen is provided at the second air inlet. The filter screen is used for coarse dust filtration, filtering out dust, catkins, and other impurities contained in the air. In some embodiments, the filter screen includes a metal filter screen.

[0045] The cold source energy storage tank 4 is connected to the input end of the first surface cooler 21. The cold source energy storage tank 4 is filled with heat insulation material. The cold source energy storage tank 4 is used to store external cold sources at night or during off-peak hours and to release the stored cold sources to the first surface cooler 21 for supplemental cooling during daytime or peak hours through connecting pipelines.

[0046] Specifically, the cold source energy storage tank 4 includes a tank body 41, several insulation panels 42, and a first temperature sensor 43. The insulation panels 42 divide the tank body 41 into several independent storage spaces 44. External cold sources are stored in the storage spaces 44 and released step-by-step to the first surface cooler 21 through electrically controlled valves 45 corresponding to each storage space 44. The first temperature sensor 43 controls the temperature of each storage space 44 to be different, and the temperature in the storage space 44 gradually decreases along the height of the tank body 41, which facilitates graded storage. During release, the cold source is released in stages according to demand. The release amount of external cold source in each storage space 44 can be controlled by controlling the opening degree of the electrically controlled valves 45.

[0047] Storage space 44 is connected to an external water source, groundwater, or heat recovery device 5. Utilizing groundwater for water-cooled heat dissipation is more cost-effective and energy-efficient. Heat recovery device 5 includes a capture component 51 for capturing indoor waste heat and a conversion component 53 for converting the waste heat into an external cold source. After capturing and converting the heat energy of the factory or data center into an external cold source using heat recovery device 5, it is transported to the cold source storage tank 4 for storage, thus recovering and reusing waste heat for greater energy efficiency. A liquid level sensor is installed inside tank 41. When the liquid level in tank 41 is lower than a first liquid level threshold, an external cold source is supplied to storage space 44.

[0048] The heat capture assembly 51 includes a rotating shaft 511, a rotating mesh 512 made of interwoven fine hot wires mounted on the rotating shaft 511, and a drive unit 52 for driving the rotating shaft 511 to rotate. The rotating shaft 511 is hollow inside and connected to the conversion assembly 53 for transferring the waste heat captured by the rotating mesh 512 to the conversion assembly 53. Multiple rotating meshes 512 are spaced apart around the axis of the rotating shaft 511. The hot wires have good thermal conductivity and can quickly absorb waste heat in the room. The drive unit 52 drives the rotating mesh 512 to rotate, continuously transferring the absorbed waste heat to the conversion assembly 53, achieving continuous and efficient waste heat capture. The heat absorbed by the heat-absorbing wires is transferred to the rotating shaft 511 and then to the conversion assembly 53 through the heat transfer effect, thereby converting it into a cold source and providing it to the cold source energy storage tank 4.

[0049] The heat recovery device 5 also includes a device body 54, and the conversion component 53 includes a spiral rotating pipe 531 rotatably disposed inside the device body 54. The rotating pipe 531 contains a cooling medium and is connected to a rotating shaft 511. The drive unit 52 simultaneously drives the rotating shaft 511 and the rotating pipe 531 to rotate.

[0050] A top plate 541 is provided on the top of the main body 54 of the device, the capture component 51 is disposed on the top plate 541, and the conversion component 53 is disposed in the space inside the main body 54 of the device. The driving component 52 includes a drive motor 521, a transmission wheel 522 respectively arranged on the output shaft of the rotating motor and the rotating shaft, and a transmission belt 523.

[0051] To improve the conversion efficiency of the heat recovery device 5, the rotating pipe 531 includes a main pipe 5311 connected to the rotating shaft 511 and several branch pipes 5312 arranged parallel to the main pipe 5311. The branch pipes 5312 are connected to the main pipe 5311 through horizontal pipes 532 that intersect in a cross shape. Waste heat is usually introduced into the rotating pipe 531 in a gaseous state and liquefies by exchanging heat with the cooling medium inside the rotating pipe 531. Each rotating pipe 531 is equipped with a solenoid valve at its end. After heat exchange is completed, the system controller controls multiple solenoid valves to open, releasing the cooled liquid into the device body 54. The bottom of the device body 54 is equipped with a pipe interface 6, which is connected to various storage spaces 44 through several conveying pipes 7.

[0052] In some embodiments, the cold source storage tank 4 is also connected to the input end of the second surface cooler 31. The cold source storage tank 4 inputs groundwater, waste heat recovery cold source, etc. into the second surface cooler 31 as cooling water, which can simplify the overall structure of the indirect evaporative cooling system and use the existing water source to complete the cooling water supply of the first surface cooler 21 and the second surface cooler 31 without the need to set up other water supply components.

[0053] This application discloses a control method for an indirect evaporative cooling system, mainly applied in the indirect evaporative cooling system described in the above embodiments, and includes the following steps:

[0054] When the cooling demand is less than the first demand threshold and the outdoor temperature is less than the first temperature threshold, only the internal circulation fan coil unit 2 and the external circulation fan coil unit 3 are activated for heat exchange. When the cooling demand is less than the first demand threshold and the outdoor temperature is less than the first temperature threshold, it indicates that the load is low and the temperature of the first airflow channel is low. Pure heat exchange is sufficient to meet the cooling demand, and only the internal circulation fan coil unit 2 and the external circulation fan coil unit 3 need to operate to meet the demand.

[0055] When the cooling demand exceeds the second demand threshold or the outdoor temperature exceeds the first temperature threshold, the spray assembly 8 is activated to assist in heat exchange. When the cooling demand is less than the minimum threshold and the outdoor temperature is less than the second temperature threshold, the spray assembly 8 is deactivated. When the cooling demand exceeds the second demand threshold, the load is high, the temperature of the first airflow channel rises, the cooling demand increases, and the rotation speed of the external circulation fan coil unit increases. Pure heat exchange cannot meet the cooling demand, and when the outdoor temperature exceeds the first temperature threshold, the spray assembly 8 is activated to assist in heat exchange. After the spray assembly 8 is activated, the temperature of the first airflow channel continuously decreases, the cooling demand gradually decreases, and the rotation speed of the external circulation fan coil unit gradually decreases. If the outdoor temperature is lower than the second temperature threshold at this time, the spray assembly 8 is deactivated, and the previous pure heat exchange mode is resumed.

[0056] When the cooling demand exceeds the maximum demand threshold, the spray assembly 8 is activated and the cold source energy storage tank 4 is started to assist in cooling. When the cooling demand further increases and exceeds the maximum demand threshold, it indicates a higher load. Even with the spray assembly 8 activated, the temperature in the first airflow channel continues to rise, so the cold source energy storage tank 4 is started to assist in cooling. When the cooling demand continues to decrease to below the minimum demand threshold, the cold source energy storage tank 4 is shut down.

[0057] When the cooling demand exceeds the maximum demand threshold and the spray assembly 8 cannot be turned on, the cold source energy storage tank 4 is activated to assist in cooling. If the spray assembly 8 fails to turn on and the load is high, pure heat exchange cannot meet the cooling demand, then the cold source energy storage tank 4 is activated to supplement cooling.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An indirect evaporative cooling system characterized by: The application relates to a heat exchanger (1) comprising a first air inlet, a first air outlet, a second air inlet, a second air outlet and a heat exchange core (11), wherein the heat exchange core (11) comprises a first air flow channel and a second air flow channel, the first air flow channel is communicated with the first air inlet and the first air outlet, the second air flow channel is communicated with the second air inlet and the second air outlet, and the first air flow channel and the second air flow channel are arranged separately and independently. An inner circulation fan coil assembly (2) is arranged on one side of the first air outlet, and the inner circulation fan coil assembly (2) comprises a first surface cooler (21) and a first fan (22). An outer circulation fan coil assembly (3) is arranged on one side of the second air outlet. A cold source energy storage tank (4) is communicated with an input end of the first surface cooler (21), the cold source energy storage tank (4) is internally provided with heat preservation materials, and the cold source energy storage tank (4) is used for storing external cold sources at night or during low peak periods and is used for releasing the stored cold sources into the first surface cooler (21) for cold compensation through a connecting pipeline during the day or during high peak periods. ​ The spray assembly (8) is arranged on one side of the second air inlet, and is used for cooling the air flow entering the heat exchanger (1) through the second air inlet; the cold source storage tank (4) comprises a tank body (41), a plurality of heat insulation plates (42) and a first temperature sensor (43), the heat insulation plates (42) separate the tank body (41) into a plurality of independent storage spaces (44), external cold sources are stored in the storage spaces (44) and are released into the first surface cooler (21) through electric control valves (45) corresponding to each of the storage spaces (44) in stages, the first temperature sensor (43) controls the temperatures of each of the storage spaces (44) to be different, and the temperature in each of the storage spaces (44) gradually decreases along the height direction of the tank body (41); the storage spaces (44) are connected to a heat recovery device (5), the heat recovery device (5) comprises a capturing assembly (51) for capturing waste heat and a conversion assembly (53) for converting waste heat into external cold sources, a liquid level detector is arranged in the tank body (41), and when the liquid level in the tank body (41) is lower than a first liquid level threshold, external cold sources are transported into the storage spaces (44); the capturing assembly (51) comprises a rotating shaft (511), a rotating net (512) made of thin heat wires and installed on the rotating shaft (511) and a driving member (52) for driving the rotating shaft (511) to rotate, the rotating shaft (511) is hollow and connected to the conversion assembly (53), so as to transport the waste heat captured by the rotating net (512) to the conversion assembly (53), and a plurality of rotating nets (512) are arranged at intervals around the axis of the rotating shaft (511); the heat recovery device (5) further comprises a device main body (54), the conversion assembly (53) comprises a spiral rotating pipeline (531) rotatably arranged in the device main body (54), the rotating pipeline (531) contains cooling medium and is in communication with the rotating shaft (511), and the driving member (52) simultaneously drives the rotating shaft (511) and the rotating pipeline (531) to rotate; The rotating pipeline (531) comprises a main pipeline (5311) connected with the rotating shaft (511) and a plurality of branch pipelines (5312) arranged in parallel with the main pipeline (5311), and the plurality of branch pipelines (5312) are connected with the main pipeline (5311) through horizontal pipelines (532) intersecting in a cross shape; wherein waste heat is introduced into the rotating pipeline (531) in a gaseous state and is liquefied by heat exchange with the cooling medium in the rotating pipeline (531); the end of each rotating pipeline (531) is provided with an electromagnetic valve, and when the heat exchange is completed, the controller of the system controls the opening of the plurality of electromagnetic valves to release the cooled liquid into the device body (54); the bottom of the device body (54) is provided with a pipeline interface (6) and is connected to each storage space (44) through a plurality of conveying pipelines (7). The cold source energy storage tank (4) is also in communication with the input end of the second surface air cooler (31), and the cold source energy storage tank (4) inputs the cold source of underground water and waste heat recovery into the second surface air cooler (31) for use as cooling water.

2. The indirect evaporative cooling system of claim 1, wherein: The device body (54) is provided with a top plate (541) at the top, the capture assembly (51) is arranged above the top plate (541), the conversion assembly (53) is arranged in the space inside the device body (54), and the driving member (52) comprises a driving motor (521), transmission wheels (522) arranged on the output shaft and rotating shaft of the driving motor (521) respectively, and a transmission belt (523).

3. A control method of an indirect evaporative cooling system, applied to the indirect evaporative cooling system of any one of claims 1-2, characterized in that: The method comprises the following steps: When the refrigeration demand is less than the first demand threshold and the outdoor temperature is less than the first temperature threshold, only the inner circulating fan coil assembly (2) and the outer circulating fan coil assembly (3) are started to perform heat exchange; When the refrigeration demand is greater than the second demand threshold or the outdoor temperature is greater than the first temperature threshold, the spraying assembly (8) is started to assist heat exchange, and when the refrigeration demand is less than the minimum threshold and the outdoor temperature is less than the second temperature threshold, the spraying assembly (8) is closed; When the refrigeration demand is greater than the maximum demand threshold, the spraying assembly (8) is started and the cold source energy storage tank (4) is started to assist refrigeration; When the refrigeration demand is greater than the maximum demand threshold and the spraying assembly (8) cannot be started, the cold source energy storage tank (4) is started to assist refrigeration.

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