Indirect evaporative cooling water chiller for data center in plateau region

Abstract

The application provides an indirect evaporative cooling water chiller for a data center in a plateau area, which runs in an open mode when the ambient temperature is high, efficiently realizes heat exchange by using indirect and direct evaporative cooling technology, and effectively controls water drift by a water baffle arranged in an air passage, so that the environmental friendliness of equipment is ensured while the natural cold source is maximally utilized and the energy consumption of the unit is reduced; in a low-temperature environment in winter, the unit is switched to a closed mode by a valve to run, so that the cooling water flows in a closed heat exchanger and is indirectly exchanged with the external sprayed air, so that the stable operation of the cooling system of the data center in a plateau cold region throughout the year is ensured. The integrated design does not need to additionally add a complex glycol antifreezing system, so that the initial investment of the air conditioning system and the operation energy consumption of the glycol circulating water pump are greatly reduced, the system process is simplified, the cold source is more single and concentrated, and the convenience of operation and maintenance is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of data center air conditioning technology, and in particular to an indirect evaporative cooling chiller unit for data centers in high-altitude areas. Background Technology

[0002] With the rapid development of information technology, data centers, as the core infrastructure for data computing and storage, have seen rapid growth in both scale and number. Data centers are typical high-density energy-consuming units, generally exhibiting high energy efficiency and significant energy-saving potential. Air conditioning systems account for 35% to 45% of the energy consumption in data centers; therefore, developing and applying highly efficient and energy-saving air conditioning equipment is one of the key ways to achieve energy conservation and emission reduction goals for data centers. Among numerous cooling technologies, indirect evaporative cooling technology fully utilizes the "dry air energy" in the air, possessing a significant advantage in energy efficiency. Chillers using this technology to produce chilled water show significantly improved energy efficiency compared to traditional cooling towers, making it one of the most efficient cooling solutions suitable for data centers.

[0003] Currently, water-side indirect evaporative cooling technology used in data centers typically combines indirect and direct evaporative cooling. Its typical structure includes an indirect evaporative cooler and a direct evaporative cooling water-spraying section. The working principle is as follows: outdoor primary air first passes through the indirect evaporative cooler and is cooled by constant humidity, then enters the water-spraying section, directly contacting the cooling return water from the data center's air conditioning terminals for heat and moisture exchange, thus cooling the cooling return water; secondary air exchanges heat with the sprayed water inside the indirect evaporative cooler, carrying away the heat from the primary air. To prevent water droplets carried in the exhaust from affecting the surrounding environment, a baffle plate is usually installed in front of the exhaust outlet. However, this existing structure of indirect evaporative cooling chillers has significant drawbacks when applied in high-altitude or cold climates. In winter, when outdoor temperatures are extremely low, the cooling water flowing in the direct evaporative cooling section (water-spraying section) is prone to freezing, forming inverted cone-shaped ice ridges that block airflow channels, causing a sharp decrease in the unit's heat dissipation capacity, and in severe cases, even freezing and damaging the equipment, failing to meet the year-round uninterrupted cooling needs of data center IT equipment. To address the issue of winter freezing, existing solutions typically require the addition of an ethylene glycol circulation system. This involves isolating the indoor and outdoor water systems using ethylene glycol plate heat exchangers and adding ethylene glycol antifreeze to the outdoor circulating water. However, this undoubtedly increases the initial investment in system equipment (requiring additional ethylene glycol pumps, plate heat exchangers, and corresponding piping) and operating energy consumption (ethylene glycol solutions have high viscosity, resulting in high pump power consumption). It also makes the cooling system more complex and diverse, increasing the difficulty and cost of subsequent maintenance.

[0004] Therefore, there is an urgent need in this field to develop a data center cooling unit that can adapt to the climate characteristics of plateau and cold regions, make full use of natural cold sources to achieve high efficiency and energy saving, fundamentally solve the problem of icing in winter, and has a simple system, low initial investment and operating costs, and convenient maintenance. Summary of the Invention

[0005] The purpose of this invention is to provide an indirect evaporative cooling chiller unit for data centers in high-altitude areas, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides an indirect evaporative cooling chiller unit for data centers in high-altitude areas, comprising:

[0008] The open-type indirect evaporative cooling module is used to operate when the ambient temperature is higher than the set temperature. It cools the cooling return water by combining indirect and direct evaporative cooling.

[0009] The closed-loop indirect evaporative cooling module is used to operate when the ambient temperature is lower than the set temperature, and cools the cooling return water through indirect evaporative cooling.

[0010] A water collection tank is used to collect the spray water from the open-type indirect evaporative cooling module and the closed-type indirect evaporative cooling module.

[0011] The cooling circulating water pump has its inlet connected to the return water pipeline on the user side, and its outlet can be selectively connected to the cooling water inlet of the open indirect evaporative cooling module or the closed indirect evaporative cooling module.

[0012] The valve control unit is used to switch the water path according to the ambient temperature, so that the cooling return water pumped by the cooling circulating water pump can selectively enter the open indirect evaporative cooling module or the closed indirect evaporative cooling module for cooling.

[0013] Preferably, the open-type indirect evaporative cooling module includes:

[0014] A vertical tube indirect evaporative cooler has a primary air passage and a secondary air passage;

[0015] The counter-flow water spray packing is located downstream of the primary air passage outlet of the vertical tube indirect evaporative cooler;

[0016] A direct section water distributor is installed above the counter-current water distribution packing material to uniformly spray the cooling return water to be cooled onto the counter-current water distribution packing material.

[0017] An indirect water distributor is installed in the secondary air passage of the vertical tube indirect evaporative cooler and is used to spray cooling water onto the secondary air side of the cooler.

[0018] An outdoor exhaust fan is located upstream or downstream of the counter-flow water-spraying packing material to drive primary air flow through the primary air passage of the vertical tube indirect evaporative cooler and the counter-flow water-spraying packing material before being discharged.

[0019] A water baffle is installed between the outdoor exhaust fan and the counter-flow water spray packing to separate water droplets in the discharged air.

[0020] The exhaust fan of the vertical tube indirect heat exchanger is used to drive secondary air to flow through the secondary air passage of the vertical tube indirect evaporative cooler and then discharge it.

[0021] Preferably, the open-type indirect evaporative cooling module further includes an indirect section baffle plate, which is disposed between the exhaust fan of the vertical tube indirect heat exchanger and the secondary air channel outlet of the vertical tube indirect evaporative cooler, for separating water droplets in the secondary air.

[0022] Preferably, the open-type indirect evaporative cooling module further includes an air filter, which is installed at the inlet of the primary air passage of the riser-type indirect evaporative cooler to filter outdoor air entering the unit.

[0023] Preferably, the closed-loop indirect evaporative cooling module includes:

[0024] An indirect evaporative cooling heat exchanger has an internal cooling water channel and an external heat exchange channel for sprayed water and air.

[0025] An indirect evaporation water distributor is installed above the indirect evaporation cooling heat exchanger to spray water onto its surface.

[0026] A spray circulating water pump, whose inlet is connected to the water collection tank and whose outlet is connected to the indirect evaporation water distributor, is used to circulate and spray water from the water collection tank onto the indirect evaporation cooling heat exchanger.

[0027] The outdoor exhaust fan is also used to drive airflow through the indirect evaporative cooling heat exchanger and the baffle plate in closed mode before exhausting it.

[0028] Preferably, the closed-loop indirect evaporative cooling module further includes an air filter, which is disposed at the air inlet of the indirect evaporative cooling heat exchanger and is used to filter outdoor air entering the unit.

[0029] Preferably, the valve control unit includes multiple valves installed on the cooling water circuit, and the switching between open and closed modes is realized by controlling the opening and closing of the multiple valves;

[0030] A first valve and a second valve are provided on the pipeline between the outlet of the cooling circulating water pump and the direct section water distributor;

[0031] A third valve is also provided on the pipeline between the outlet of the cooling circulating water pump and the cooling water inlet of the indirect evaporative cooling heat exchanger;

[0032] A fourth valve is installed on the connection pipe between the cooling water outlet of the indirect evaporative cooling heat exchanger and the user-side water supply pipeline.

[0033] Preferably, when the unit is operating in open mode, the first and second valves are open, and the third and fourth valves are closed. The cooling return water enters the direct section water distributor in sequence through the cooling circulating water pump, the first valve, and the second valve. After exchanging heat and moisture with the primary air pre-cooled by the vertical tube indirect evaporative cooler in the counter-flow water distribution packing, it flows into the water collection tank.

[0034] Preferably, when the unit is operating in closed mode, the first and second valves are closed, and the third and fourth valves are open. The cooling return water enters the internal channel of the indirect evaporative cooling heat exchanger through the cooling circulating water pump and the third valve in sequence. After indirect heat exchange with the external spray water, it flows to the user side through the fourth valve.

[0035] Preferably, the indirect evaporative cooling heat exchanger is a tubular indirect evaporative cooler or a plate-tube indirect evaporative cooler, and its surface is provided with heat exchanger fins (6-1) to enhance heat exchange.

[0036] The present invention achieves the following beneficial technical effects compared to the prior art:

[0037] This invention provides an indirect evaporative cooling chiller unit for data centers in high-altitude areas. By integrating both open and closed-loop indirect evaporative cooling modules and incorporating a valve control unit for mode switching, it features a compact structure, strong adaptability, and safe and reliable operation. Compared to existing technologies, this invention operates in open mode at higher ambient temperatures, utilizing indirect and direct evaporative cooling technologies for efficient heat exchange. Water drift is effectively controlled by baffles installed in the air channels, maximizing the use of natural cooling sources, reducing unit energy consumption, and ensuring the environmental friendliness of the equipment. In low-temperature winter environments, the system switches to closed-loop mode via valves, allowing cooling water to flow within a sealed heat exchanger and indirectly exchange heat with external sprayed air. This completely eliminates the risk of icing and blockage in the spray packing section of traditional open cooling towers, ensuring stable year-round operation of the data center cooling system in frigid high-altitude regions. Meanwhile, this integrated design eliminates the need for an additional complex ethylene glycol antifreeze system, which not only significantly reduces the initial investment in the air conditioning system and the operating energy consumption of the ethylene glycol circulating water pump, but also simplifies the system process, making the cold source more singular and centralized, and significantly improving the convenience of operation and maintenance. It provides a new, economical, efficient and reliable cooling solution for data centers in high-altitude areas. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the structure of an indirect evaporative cooling chiller unit for data centers in high-altitude areas provided by the present invention;

[0040] Figure 2 This invention provides a schematic diagram of the structure of an indirect evaporative cooler in an indirect evaporative cooling chiller unit for data centers in high-altitude areas. Detailed Implementation

[0041] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] The purpose of this invention is to provide an indirect evaporative cooling chiller unit for data centers in high-altitude areas, aiming to solve the problems of easy freezing in winter, high initial investment, and system complexity of existing data center cooling systems in high-altitude and cold regions.

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Example 1:

[0047] like Figure 1As shown, this invention provides an indirect evaporative cooling chiller unit for data centers in high-altitude areas, comprising an open-type indirect evaporative cooling module, a closed-type indirect evaporative cooling module, a water collection tank 18, a cooling water circulation pump 17, and a valve control unit. The open-type indirect evaporative cooling module operates when the ambient temperature is higher than the set temperature, cooling the return water through a combination of indirect and direct evaporative cooling. The closed-type indirect evaporative cooling module operates when the ambient temperature is lower than the set temperature, cooling the return water through indirect evaporative cooling to avoid the risk of freezing caused by direct evaporative cooling at low temperatures. The water collection tank 18 is located at the bottom of the unit and collects the spray water generated during the entire unit's operation. The inlet of the cooling water circulation pump 17 is connected to the return water pipeline on the user side (i.e., the data center air conditioning terminal), and its outlet is selectively connected to the cooling water inlet of either the open-type or closed-type indirect evaporative cooling module via a pipeline. The valve control unit is used to switch the water path according to changes in ambient temperature, so that the cooling return water pumped by the cooling circulating water pump 17 from the data center can selectively enter the open indirect evaporative cooling module or the closed indirect evaporative cooling module for cooling treatment.

[0048] Specifically, such as Figure 1 As shown, the open-type indirect evaporative cooling module mainly includes a vertical tube indirect evaporative cooler 10, a counter-flow water distribution packing 4, a direct section water distributor 3, an indirect section water distributor 9, an outdoor exhaust fan 1, a baffle plate 2, and a vertical tube indirect heat exchanger exhaust fan 7. The vertical tube indirect evaporative cooler 10 has a primary air passage and a secondary air passage; its specific structure can be found in [reference needed]. Figure 2As shown. The counter-flow water-spraying packing 4 is located downstream of the primary air passage outlet of the vertical tube indirect evaporative cooler 10. The direct section water distributor 3 is located above the counter-flow water-spraying packing 4, used to evenly spray the cooling return water to be cooled onto the counter-flow water-spraying packing 4, allowing it to fully contact the air for heat and moisture exchange. The indirect section water distributor 9 is located in the secondary air passage of the vertical tube indirect evaporative cooler 10, used to spray cooling water from the secondary air side onto it to cool the air in the secondary air passage. The outdoor exhaust fan 1 is located upstream or downstream of the counter-flow water-spraying packing 4, used to drive the primary air flow through the primary air passage of the vertical tube indirect evaporative cooler 10 and the counter-flow water-spraying packing 4 before exhausting it outdoors. To prevent water droplets entrained in the exhaust air from affecting the surrounding environment, a baffle 2 is installed in the air passage between the outdoor exhaust fan 1 and the counter-flow water-spraying packing 4 to separate water droplets in the exhaust air. The exhaust fan 7 of the vertical indirect heat exchanger drives secondary air to flow through the secondary air passage of the vertical indirect evaporative cooler 10 before being discharged. Furthermore, to further improve the water-blocking effect on the secondary air side, the open indirect evaporative cooling module also includes an indirect section baffle 8, which is located between the exhaust fan 7 and the outlet of the secondary air passage of the vertical indirect heat exchanger 10, and is used to separate water droplets in the secondary air. An air filter 11 is also installed at the inlet of the primary air passage of the vertical indirect evaporative cooler 10 to filter the outdoor air entering the unit, ensuring the cleanliness of the heat exchange surface and maintaining heat exchange efficiency.

[0049] like Figure 1 As shown, the closed-loop indirect evaporative cooling module mainly includes an indirect evaporative cooling heat exchanger 6, an indirect evaporative water distributor 5, and a spray circulating water pump 14. The internal channels of the indirect evaporative cooling heat exchanger 6 form cooling water channels for introducing cooling return water that needs to be cooled; its external surface is a heat exchange channel between the spray water and the air. The indirect evaporative water distributor 5 is located above the indirect evaporative cooling heat exchanger 6 and is used to spray spray water onto its surface. The spray water forms a water film on the heat exchanger surface, exchanging heat and moisture with the flowing air. The inlet of the spray circulating water pump 14 is connected to a water collection tank 18, and its outlet is connected to the indirect evaporative water distributor 5, used to circulate the spray water collected in the water collection tank 18 onto the indirect evaporative cooling heat exchanger 6. In closed-loop mode, the aforementioned outdoor exhaust fan 1 is also used to drive air to flow through the indirect evaporative cooling heat exchanger 6, exchange heat and moisture with the water film on the heat exchanger surface, and then flow through the baffle plate 2 before being discharged into the environment. Similarly, an air filter 11 is also installed at the air inlet of the closed-loop indirect evaporative cooling module to filter the outdoor air entering the unit. Figure 2 As shown, in a preferred embodiment, the indirect evaporative cooling heat exchanger 6 can be a tubular indirect evaporative cooler or a plate-tube indirect evaporative cooler, and its surface can be provided with heat exchanger fins 6-1 to increase the heat exchange area and thus enhance the heat exchange effect.

[0050] The valve control unit of this invention is used to switch between open and closed modes. In one specific embodiment, such as... Figure 1 As shown, the valve control unit includes multiple valves installed on the cooling water circuit, specifically a first valve 16, a second valve 20, a third valve 19, and a fourth valve 15. Specifically, the first valve 16 and the second valve 20 are installed on the pipeline between the outlet of the cooling water pump 17 and the direct-section water distributor 3; the third valve 19 is installed on the pipeline between the outlet of the cooling water pump 17 and the cooling water inlet of the indirect evaporative cooling heat exchanger 6; and the fourth valve 15 is installed on the connecting pipeline between the cooling water outlet of the indirect evaporative cooling heat exchanger 6 and the user-side water supply pipeline. By controlling the opening and closing of these valves, the two operating modes can be switched.

[0051] When the ambient temperature is high (e.g., during summer and transitional seasons), the unit operates in open mode. At this time, the first valve 16 and the second valve 20 are open, while the third valve 19 and the fourth valve 15 are closed. Cooling return water from the data center air conditioning terminal, driven by the cooling circulating water pump 17, flows sequentially through the first valve 16 and the second valve 20, entering the direct-flow water distributor 3, where it is evenly sprayed onto the counter-flow water-spraying packing 4. Simultaneously, outdoor air, driven by the outdoor exhaust fan 1, forms primary air. This primary air is first filtered by the air filter 11 and then enters the primary air passage of the vertical indirect evaporative cooler 10, where it is pre-cooled by isohumidification cooling. The pre-cooled primary air then enters the counter-flow water-spraying packing 4, where it directly contacts the cooling return water flowing downwards, exchanging heat and moisture on the packing surface. The cooling return water temperature decreases, while the air is heated and humidified. The humidified air passes through the baffle plate 2 to remove entrained water droplets and is then discharged to the environment by the outdoor exhaust fan 1. On the other hand, driven by the exhaust fan 7 of the vertical tube indirect heat exchanger, another portion of the outdoor air forms secondary air, which enters the secondary air passage of the vertical tube indirect evaporative cooler 10. There, it exchanges heat and moisture with the cooling water sprayed by the indirect section water distributor 9. After absorbing the heat transferred from the primary air, it passes through the indirect section baffle 8 to remove water and is then discharged to the environment by the exhaust fan 7. The cooling return water, after heat exchange in the counter-flow water-spraying packing 4, finally falls into the water collection tank 18, ready for the next cycle or discharge.

[0052] When the ambient temperature is low (e.g., in winter), the unit switches to closed-loop operation. At this time, the first valve 16 and the second valve 20 are closed, while the third valve 19 and the fourth valve 15 are open. Cooling return water from the data center, driven by the cooling circulating water pump 17, flows sequentially through the third valve 19 and enters the internal channel of the indirect evaporative cooling heat exchanger 6. Simultaneously, the spray circulating water pump 14 starts, transporting water from the collection tank 18 to the indirect evaporative water distributor 5, which evenly sprays the water onto the outer surface of the indirect evaporative cooling heat exchanger 6, forming a uniform water film. Outdoor air, driven by the outdoor exhaust fan 1, first passes through the air filter 11 and then flows over the outer surface of the indirect evaporative cooling heat exchanger 6, exchanging heat and moisture with the water film. The water film absorbs heat from the air and evaporates, thereby cooling the heat exchanger tube walls and the internal cooling return water. The heated and humidified air passes through the baffle plate 2 to remove entrained water droplets before being discharged into the environment by the outdoor exhaust fan 1. The cooling return water indirectly exchanges heat with the spray water outside the pipes in the internal channels of the indirect evaporative cooling heat exchanger 6. After the temperature decreases, it flows out through the fourth valve 15 and returns to the data center air conditioning terminal, completing the cooling cycle. In this mode, the cooling return water flows in a closed pipe and does not come into direct contact with the outdoor air, completely avoiding the risk of water freezing in the water spray packing due to low temperature.

[0053] In summary, the indirect evaporative cooling chiller unit for data centers in high-altitude areas of this invention, through structural integration and innovation and rational design of valve control unit, achieves dual-mode operation under different ambient temperatures. This ensures high efficiency and energy saving, solves the problem of winter freeze protection, simplifies the system, and reduces costs and maintenance difficulty, making it very suitable for promotion and application in data centers in high-altitude and cold regions.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] It should be noted that the components mentioned in the above embodiments are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0056] This invention has illustrated its principles and implementation methods using specific examples. The descriptions of these embodiments are merely illustrative of the method and its core ideas; furthermore, those skilled in the art will recognize that modifications may be made to the specific implementation methods and application scope based on the principles of this invention. Therefore, the content of this specification should not be construed as limiting the invention.

Claims

1. An indirect evaporative cooling chiller unit for data centers in high-altitude areas, characterized in that, include: The open-type indirect evaporative cooling module is used to operate when the ambient temperature is higher than the set temperature. It cools the cooling return water by combining indirect and direct evaporative cooling. The closed-loop indirect evaporative cooling module is used to operate when the ambient temperature is lower than the set temperature, and cools the cooling return water through indirect evaporative cooling. Water collection tank (18) is used to collect the spray water from the open indirect evaporative cooling module and the closed indirect evaporative cooling module; The cooling circulating water pump (17) has its inlet connected to the return water pipeline on the user side, and its outlet can be selectively connected to the cooling water inlet of the open indirect evaporative cooling module or the closed indirect evaporative cooling module. The valve control unit is used to switch the water path according to the ambient temperature, so that the cooling return water pumped by the cooling circulating water pump (17) can selectively enter the open indirect evaporative cooling module or the closed indirect evaporative cooling module for cooling.

2. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 1, characterized in that, The open-type indirect evaporative cooling module includes: The vertical tube indirect evaporative cooler (10) has a primary air passage and a secondary air passage; Counter-flow water spray packing (4) is located downstream of the primary air channel outlet of the vertical tube indirect evaporative cooler (10); The direct section water distributor (3) is set above the counter-current water distribution packing (4) and is used to uniformly spray the cooling return water to be cooled onto the counter-current water distribution packing (4). Indirect section water distributor (9) is installed in the secondary air passage of the vertical tube indirect evaporative cooler (10) and is used to spray cooling water on the secondary air side to it. An outdoor exhaust fan (1) is located upstream or downstream of the counter-flow water-spraying packing (4) to drive primary air to flow through the primary air passage of the vertical tube indirect evaporative cooler (10) and the counter-flow water-spraying packing (4) before being discharged. A baffle plate (2) is installed between the outdoor exhaust fan (1) and the counter-flow water spray packing (4) to separate water droplets in the exhaust air; The exhaust fan (7) of the vertical tube indirect heat exchanger is used to drive the secondary air to flow through the secondary air passage of the vertical tube indirect evaporative cooler (10) and then discharge it.

3. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 2, characterized in that, The open-type indirect evaporative cooling module also includes an indirect section baffle plate (8), which is located between the exhaust fan (7) of the vertical tube indirect heat exchanger and the secondary air channel outlet of the vertical tube indirect evaporative cooler (10) to separate water droplets in the secondary air.

4. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 2, characterized in that, The open-type indirect evaporative cooling module also includes an air filter (11), which is located at the inlet of the primary air passage of the vertical indirect evaporative cooler (10) and is used to filter the outdoor air entering the unit.

5. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 2, characterized in that, The open-type indirect evaporative cooling module also includes an air filter (11), which is located at the inlet of the primary air passage of the vertical indirect evaporative cooler (10) and is used to filter the outdoor air entering the unit.

6. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 5, characterized in that, The closed-loop indirect evaporative cooling module also includes an air filter (11), which is located at the air inlet of the indirect evaporative cooling heat exchanger (6) and is used to filter the outdoor air entering the unit.

7. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 5, characterized in that, The valve control unit includes multiple valves installed on the cooling water circuit. By controlling the opening and closing of the multiple valves, the open mode and the closed mode can be switched. A first valve (16) and a second valve (20) are provided on the pipeline between the outlet of the cooling circulating water pump (17) and the direct section water distributor (3). A third valve (19) is provided on the pipeline between the outlet of the cooling circulating water pump (17) and the cooling water inlet of the indirect evaporative cooling heat exchanger (6). The cooling water outlet of the indirect evaporative cooling heat exchanger (6) is connected to the user-side water supply pipeline by a fourth valve (15).

8. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 7, characterized in that, When the unit is operating in open mode, the first valve (16) and the second valve (20) are open, and the third valve (19) and the fourth valve (15) are closed. The cooling return water enters the direct section water distributor (3) in sequence through the cooling circulating water pump (17), the first valve (16), and the second valve (20). After exchanging heat and moisture with the primary air pre-cooled by the vertical tube indirect evaporative cooler (10) in the counter-flow water spray packing (4), it flows into the water collection tank (18).

9. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 7, characterized in that, When the unit is operating in closed mode, the first valve (16) and the second valve (20) are closed, and the third valve (19) and the fourth valve (15) are opened. The cooling return water enters the internal channel of the indirect evaporative cooling heat exchanger (6) through the cooling circulating water pump (17) and the third valve (19) in sequence. After indirect heat exchange with the external spray water, it flows to the user side through the fourth valve (15).

10. The indirect evaporative cooling chiller unit for data centers in high-altitude areas according to claim 5, characterized in that, The indirect evaporative cooling heat exchanger (6) is a tubular indirect evaporative cooler or a plate-tube indirect evaporative cooler, and its surface is provided with heat exchanger fins (6-1) to enhance heat exchange.

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