Cooling unit and control method of cooling unit

Abstract

The invention discloses a cooling unit and a control method of the cooling unit, the cooling unit comprises a shell, the shell is provided with an indoor space and an outdoor space which are spaced, and the indoor space is provided with a fresh air inlet, an indoor air inlet and an indoor air outlet; the indoor fan is used for driving airflow to flow from the indoor air inlet and the fresh air inlet to the indoor air outlet; the indirect heat exchange system comprises an indoor coil pipe and an outdoor coil pipe, the indoor coil pipe is located in the indoor space, the outdoor coil pipe is located in the outdoor space, and the indoor coil pipe and the outdoor coil pipe are used for heat exchange. According to the cooling unit, different cooling modes can be selected according to the outdoor temperature, the overall energy consumption of the cooling unit is reduced while the equipment to be cooled is cooled, and energy saving is achieved.

Description

Technical Field

[0001] This invention relates to the field of air handling equipment technology, and in particular to a cooling unit and a control method for the cooling unit. Background Technology

[0002] Cooling units are used to cool equipment such as data centers. However, in existing technologies, cooling units typically rely on compressors to activate the refrigeration system, resulting in a single cooling mode and high overall energy consumption. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a cooling unit that can select different cooling modes according to the outdoor temperature, thereby reducing the overall energy consumption of the cooling unit while cooling the equipment to be cooled, thus achieving energy saving.

[0004] A cooling unit according to an embodiment of the present invention includes: a housing having a spaced-apart indoor space and an outdoor space, the indoor space having a fresh air inlet, an indoor air inlet, and an indoor air outlet; an indoor fan for driving airflow from the indoor air inlet and the fresh air inlet to the indoor air outlet; and an indirect heat exchange system including an indoor coil and an outdoor coil, the indoor coil being located in the indoor space and the outdoor coil being located in the outdoor space, the indoor coil and the outdoor coil being used for heat exchange.

[0005] According to an embodiment of the present invention, the cooling unit has a casing with a spaced-out indoor space and an outdoor space. The indoor space has a fresh air inlet, an indoor air inlet, and an indoor air outlet. An indoor fan drives the airflow from the indoor air inlet and the fresh air inlet to the indoor air outlet. The indirect heat exchange system includes an indoor coil and an outdoor coil. The indoor coil is located in the indoor space, and the outdoor coil is located in the outdoor space. The indoor coil and the outdoor coil are used for heat exchange, so that the cooling unit can select different cooling modes according to the outdoor temperature. While cooling the equipment to be cooled, the overall energy consumption of the cooling unit is reduced, thus achieving energy saving.

[0006] In some embodiments of the present invention, a fresh air valve is provided at the fresh air inlet for opening or closing the fresh air inlet; and / or, a return air valve is provided at the indoor air inlet for opening or closing the indoor air inlet.

[0007] In some embodiments of the present invention, the indoor fan is located at the indoor air outlet.

[0008] In some embodiments of the present invention, the indoor fans are multiple units arranged at intervals.

[0009] In some embodiments of the present invention, the indoor coil and the outdoor coil are connected end to end to form a heat exchange loop. The indirect heat exchange system further includes a circulating water pump, which is located on the heat exchange loop and is used to drive the heat exchange medium to circulate between the indoor coil and the outdoor coil.

[0010] In some embodiments of the present invention, the indirect heat exchange system further includes a spray system located in the outdoor space for spraying water onto the outdoor coil.

[0011] In some embodiments of the present invention, the sprinkler system includes: a water tank; a sprinkler device connected to the water tank, the sprinkler device being used to spray water onto the outdoor coil; and a sprinkler pump connected between the water tank and the sprinkler device, for driving water in the water tank to flow to the sprinkler device.

[0012] In some embodiments of the present invention, the spraying device includes: a collection pipe, the collection pipe extending along the length direction of the outdoor coil and one end connected to the water tank, the collection pipe having a plurality of spray holes, the plurality of spray holes being arranged facing the outdoor coil and spaced apart along the length direction of the collection pipe.

[0013] In some embodiments of the present invention, the spraying device further includes a plurality of nozzles, the plurality of nozzles being respectively disposed at a plurality of spray holes.

[0014] In some embodiments of the present invention, the sprinkler system further includes a water receiving tray, which is disposed below the outdoor coil and is connected to the water tank.

[0015] In some embodiments of the present invention, at least one of the indoor coil and the outdoor coil includes: a heat exchange tube; and fins connected to the outside of the heat exchange tube.

[0016] In some embodiments of the present invention, the cooling unit further includes a refrigeration system, which includes a compressor, an outdoor heat exchanger, and an indoor heat exchanger. The compressor, the outdoor heat exchanger, and the indoor heat exchanger are connected to form a refrigeration circuit. The compressor and the indoor heat exchanger are located in the indoor space, and the outdoor heat exchanger is located in the outdoor space.

[0017] In some embodiments of the present invention, the compressors are multiple compressors arranged in parallel; or, the compressor is a single compressor, which is a magnetic levitation compressor.

[0018] In some embodiments of the present invention, the indoor coil and the indoor heat exchanger are arranged sequentially along the airflow direction.

[0019] In some embodiments of the present invention, the outdoor space has an outdoor air inlet and an outdoor air outlet, and the cooling unit further includes an outdoor fan, which drives airflow from the outdoor air inlet to the outdoor air outlet.

[0020] In some embodiments of the present invention, the outdoor coil and the outdoor heat exchanger are arranged sequentially along the airflow direction, and the outdoor heat exchanger has a heat exchange flow path connected in series between the compressor and the indoor heat exchanger.

[0021] In some embodiments of the present invention, the indirect heat exchange system further includes a spray system for simultaneously spraying water onto the outdoor coil and the outdoor heat exchanger.

[0022] In some embodiments of the present invention, the indoor coil and the outdoor coil are connected end to end to form a heat exchange circuit. The outdoor heat exchanger has a first heat exchange flow path and a second heat exchange flow path for mutual heat exchange. The first heat exchange flow path is connected in series between the compressor and the indoor heat exchanger, and the second heat exchange flow path is connected in parallel to the heat exchange flow path and is located downstream of the indoor coil and upstream of the outdoor coil.

[0023] In some embodiments of the present invention, the flow directions of the first heat exchange path and the second heat exchange path are opposite.

[0024] In some embodiments of the present invention, the outdoor fans are multiple units arranged at intervals.

[0025] In some embodiments of the present invention, the outdoor fan is located at the outdoor air outlet.

[0026] In some embodiments of the present invention, the housing has a partition for dividing the space inside the housing into an outdoor space and an indoor space arranged in a horizontal direction. The fresh air inlet is disposed on the partition, and the indoor air inlet and the indoor air outlet are disposed on the housing. The housing is also provided with an outdoor air inlet and an outdoor air outlet communicating with the outdoor space.

[0027] According to an embodiment of the present invention, the control method for a cooling unit, wherein the cooling unit is the aforementioned cooling unit, the control method includes: acquiring the outdoor inlet dry-bulb temperature Td; determining that the outdoor inlet dry-bulb temperature Td is less than or equal to the outdoor inlet switching temperature To2; controlling the cooling unit to operate in dry mode; exchanging heat through the indoor coil and the outdoor coil; operating the indoor fan; closing the fresh air inlet; opening the indoor air inlet; and opening the indoor air outlet.

[0028] According to the control method of the cooling unit of the present invention, by determining that the outdoor inlet dry-bulb temperature Td is less than or equal to the outdoor inlet switching temperature To2, the cooling unit is controlled to operate in dry mode, and heat exchange is carried out through the indoor coil and the outdoor coil. The indoor fan is running, the fresh air inlet is closed, the indoor air inlet is open, and the indoor air outlet is open. In this way, the indoor air is cooled and reduced through the indirect heat exchange system, thereby achieving the cooling effect of the cooling unit.

[0029] In some embodiments of the present invention, the control method further includes: determining that the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To2 and less than or equal to the outdoor intake switching temperature To1, wherein To2 < To1; obtaining the supply air humidity Tw1 of the equipment to be cooled; determining that the supply air humidity Tw1 of the equipment to be cooled is greater than or equal to Twset-10% and less than or equal to Twset+10%, wherein Twset is the supply air set humidity of the equipment to be cooled; controlling the cooling unit to operate in direct ventilation mode, wherein the indoor coil and the outdoor coil stop working, the indoor fan runs, the fresh air inlet opens, the indoor air inlet opens, and the indoor air outlet opens.

[0030] In some embodiments of the present invention, the control method further includes: determining that the supply air humidity Tw1 of the equipment to be cooled is less than Twset-10% or greater than Twset+10%; controlling the cooling unit to operate in dry mode, exchanging heat through the indoor coil and the outdoor coil, operating the indoor fan, closing the fresh air inlet, opening the indoor air inlet, and opening the indoor air outlet.

[0031] In some embodiments of the present invention, the indirect heat exchange system further includes a spray system for spraying water onto the outdoor coil. The control method further includes: determining that the outdoor inlet dry-bulb temperature Td is greater than the outdoor inlet switching temperature To1; determining that the outdoor inlet wet-bulb temperature Tw is less than or equal to the outdoor inlet switching wet-bulb temperature Two; controlling the cooling unit to operate in wet mode; controlling the indoor coil and the outdoor coil to operate; turning on the spray system; operating the indoor fan; closing the fresh air inlet; opening the indoor air inlet; and opening the indoor air outlet.

[0032] In some embodiments of the present invention, the cooling unit further includes a refrigeration system, which includes a compressor, an outdoor heat exchanger, and an indoor heat exchanger. The compressor, the outdoor heat exchanger, and the indoor heat exchanger are connected to form a refrigeration circuit. The control method further includes: determining that the outdoor inlet wet-bulb temperature Tw is greater than the outdoor inlet switching wet-bulb temperature Two; controlling the cooling unit to operate in a mixed mode, controlling the indoor coil and the outdoor coil to work, the spray system to start, the compressor to run, the fresh air inlet to close, the indoor fan to run, the indoor air inlet to open, and the indoor air outlet to open.

[0033] In some embodiments of the present invention, the cooling unit further includes a refrigeration system, which includes a compressor, an outdoor heat exchanger, and an indoor heat exchanger. The compressor, the outdoor heat exchanger, and the indoor heat exchanger are connected to form a refrigeration circuit. The outdoor heat exchanger has a heat exchange flow path connected in series between the compressor and the indoor heat exchanger. The control method further includes: determining that the outdoor inlet wet-bulb temperature Tw is greater than the outdoor inlet switching wet-bulb temperature Two; controlling the cooling unit to operate in a pure mechanical refrigeration mode; controlling the indoor coil and the outdoor coil to stop working; the spray system to be turned off; the compressor to be running; the fresh air inlet to be closed; the indoor fan to be running; the indoor air inlet to be opening; and the indoor air outlet to be opening.

[0034] In some embodiments of the present invention, the control method further includes: when the outdoor intake wet-bulb temperature Tw is less than or equal to the supply air set temperature Tset of the device to be cooled, controlling the compressor to operate at a first frequency, wherein Tset > Two; when the outdoor intake wet-bulb temperature Tw is greater than the supply air set temperature Tset of the device to be cooled, controlling the compressor to operate at a second frequency, wherein the second frequency is greater than the first frequency.

[0035] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 This is a schematic diagram of the structure of a cooling unit according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of a cooling unit according to another embodiment of the present invention;

[0039] Figure 3This is a logical schematic diagram of a control method for a cooling unit according to an embodiment of the present invention.

[0040] Figure label:

[0041] 100. Cooling unit;

[0042] 1. Indirect heat exchange system; 11. Indoor coil; 12. Outdoor coil; 13. Circulating water pump; 14. Spray system; 141. Water tank; 142. Spray device; 143. Spray water pump; 15. Three-way valve; 151. First port; 152. Second port; 153. Third port;

[0043] 2. Refrigeration system; 21. Compressor; 22. Outdoor heat exchanger; 23. Indoor heat exchanger; 24. Indoor fan; 25. Throttling device;

[0044] 3. Outdoor fan;

[0045] 4. Fresh air valve;

[0046] 5. Return air valve;

[0047] 61. Indoor space; 62. Outdoor space; 63. Fresh air inlet; 64. Indoor air inlet; 65. Indoor air outlet; 66. Outdoor air inlet; 67. Outdoor air outlet. Detailed Implementation

[0048] In this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

[0050] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] The cooling unit 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0054] like Figure 1 and Figure 2 As shown, a cooling unit 100 according to an embodiment of the present invention includes a housing, an indoor fan 24, and an indirect heat exchange system 1.

[0055] The shell has a spaced-out indoor space 61 and an outdoor space 62. The indoor space 61 has a fresh air inlet 63, an indoor air inlet 64 and an indoor air outlet 65. The indoor fan 24 is used to drive the airflow from the indoor air inlet 64 and the fresh air inlet 63 to the indoor air outlet 65. The indirect heat exchange system 1 includes an indoor coil 11 and an outdoor coil 12. The indoor coil 11 is located in the indoor space 61 and the outdoor coil 12 is located in the outdoor space 62. The indoor coil 11 and the outdoor coil 12 are used for heat exchange.

[0056] It is understandable that the cooling unit 100 is used to cool down the equipment to be cooled, ensuring the reliability of the equipment's operation. At the same time, the cooling unit 100 can select different cooling modes according to the outdoor temperature, thereby reducing the overall energy consumption of the cooling unit 100 and achieving energy saving while cooling down the equipment to be cooled.

[0057] It should be noted that the equipment to be cooled can be a data center.

[0058] Specifically, when the cooling unit 100 operates in dry mode, the indoor fan 24 runs, the fresh air inlet 63 is closed, the indoor air inlet 64 is open, and the indoor air outlet 65 is open, allowing heat exchange between the indoor coil 11 and the outdoor coil 12. In the outdoor space 62, outdoor air flows through the outdoor coil 12 and exchanges heat with it, then the indoor coil 11 exchanges heat with the outdoor coil 12. Indoor air enters the indoor space 61 from the indoor air inlet 64. In the indoor space 61, indoor air flows through the indoor coil 11 and exchanges heat with the outdoor coil 12. The cooled indoor air flows from the indoor air outlet 65 to the equipment to be cooled, thus achieving cooling of the indoor air through the indirect heat exchange system 1, thereby achieving cooling of the equipment to be cooled by the cooling unit 100.

[0059] When the cooling unit 100 operates in direct ventilation mode, the indoor coil 11 and outdoor coil 12 stop working, the indoor fan 24 runs, the fresh air inlet 63 opens, the indoor air inlet 64 opens, and the indoor air outlet 65 opens. Outdoor air enters the outdoor space 62 and directly enters the indoor space 61 via the fresh air inlet 63, or outdoor air directly enters the indoor space 6162 via the fresh air inlet 63. The cooler outdoor air entering from the fresh air inlet 63 mixes with the indoor air entering the indoor space 61 via the indoor air inlet 64 and flows from the indoor air outlet 65 to the equipment to be cooled. Thus, the outdoor air directly cools the indoor air, thereby achieving the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0060] Furthermore, the ratio of the air volume entering the indoor space 61 from the fresh air inlet 63 to the air volume entering the indoor space 61 from the indoor air inlet 64 can be controlled according to the outdoor temperature and the operating temperature requirements of the equipment to be cooled, thereby improving the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0061] Furthermore, when the indoor coil 11 is working and the indoor fan 24 is running, the power of the indoor fan 24 can be adjusted according to the pressure inside the indoor coil 11, thereby adjusting the speed of the indoor fan 24 to change the air flow rate in the indoor space 61, and thus adjusting the cooling effect of the cooling unit 100 to improve the adaptability, energy efficiency and reliability of the cooling unit 100.

[0062] According to an embodiment of the present invention, the cooling unit 100 has a housing with a spaced-apart indoor space 61 and an outdoor space 62. The indoor space 61 has a fresh air inlet 63, an indoor air inlet 64, and an indoor air outlet 65. An indoor fan 24 is used to drive airflow from the indoor air inlet 64 and the fresh air inlet 63 to the indoor air outlet 65. The indirect heat exchange system 1 includes an indoor coil 11 and an outdoor coil 12. The indoor coil 11 is located in the indoor space 61, and the outdoor coil 12 is located in the outdoor space 62. The indoor coil 11 and the outdoor coil 12 are used for heat exchange, so that the cooling unit 100 can select different cooling modes according to the outdoor temperature. While cooling the equipment to be cooled, the overall energy consumption of the cooling unit 100 is reduced, thus achieving energy saving.

[0063] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a fresh air valve 4 is provided at the fresh air inlet 63, which is used to open or close the fresh air inlet 63.

[0064] Therefore, when the cooling unit 100 is running in direct ventilation mode, the fresh air inlet 63 is opened by the fresh air valve 4 so that outdoor air can directly enter the indoor space 61 through the fresh air inlet 63, so as to achieve the cooling effect of the cooling unit 100 on the equipment to be cooled. Furthermore, by controlling the opening of the fresh air valve 4, the air volume of outdoor air entering the indoor space 61 from the fresh air inlet 63 can be adjusted so that the cooling unit 100 can meet the different cooling needs of the equipment to be cooled.

[0065] When the cooling unit 100 is running in dry mode, the fresh air inlet 63 is closed by the fresh air valve 4, and the outdoor air cannot directly enter the indoor space 61 through the fresh air inlet 63. The cooling unit 100 achieves cooling and temperature reduction through the indirect heat exchange system 1.

[0066] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a return air valve 5 is provided at the indoor air inlet 64, which is used to open or close the indoor air inlet 64.

[0067] Therefore, during the cooling process of the cooling unit 100, the indoor air inlet 64 is opened by the return air valve 5, allowing indoor air to enter the indoor space 61 from the indoor air inlet 64 and mix with the indoor coil 11 or outdoor air before flowing from the indoor air outlet 65 to the equipment to be cooled, thus achieving the cooling effect of the cooling unit 100. Simultaneously, when the cooling unit 100 operates in direct ventilation mode, the opening degree of the return air valve 5 is controlled to adjust the airflow entering the indoor space 61 from the indoor air inlet 64, ensuring that the cooling unit 100 meets the different cooling requirements of the equipment.

[0068] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the indoor fan 24 is located at the indoor air outlet 65. It can be understood that the indoor fan 24 is used to drive the airflow from the indoor air inlet 64 and the fresh air inlet 63 to the indoor air outlet 65. By placing the indoor fan 24 at the indoor air outlet 65, the airflow path within the indoor space 61 is made more reasonable and stable, ensuring that the cooled airflow in the indoor space 61 can flow smoothly out of the indoor air outlet 65, thereby improving overall reliability.

[0069] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, multiple indoor fans 24 are arranged at intervals. Therefore, by operating multiple indoor fans 24 simultaneously, the uniformity of airflow can be enhanced. The spaced arrangement of multiple indoor fans 24 can cover a larger space, thereby expanding the range of airflow and improving heat exchange efficiency. Furthermore, when one indoor fan 24 fails, the remaining indoor fans 24 can continue to operate, avoiding the shutdown of the indirect heat exchange system 1 and the refrigeration system 2, and improving the operational stability and reliability of the cooling unit 100.

[0070] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the indoor coil 11 and the outdoor coil 12 are connected end to end to form a heat exchange loop. The indirect heat exchange system 1 also includes a circulating water pump 13. The circulating water pump 13 is located on the heat exchange loop and is used to drive the heat exchange medium to circulate between the indoor coil 11 and the outdoor coil 12.

[0071] Therefore, in the indirect heat exchange system 1, outdoor air flows through the outdoor coil 12, where it exchanges heat with the heat exchange medium. The temperature of the heat exchange medium decreases after exchanging heat with the outdoor air and flows into the indoor coil 11 driven by the circulating water pump 13. Indoor air flows through the indoor coil 11, where it exchanges heat with the indoor coil 11. The temperature of the indoor air decreases after exchanging heat with the indoor coil 11, which can be used to cool the data center. The temperature of the heat exchange medium in the indoor coil 11 increases and flows into the outdoor coil 12 driven by the circulating water pump 13, and this cycle continues. Thus, the indoor air can be cooled through the indirect heat exchange system 1, thereby achieving the cooling effect on equipment to be cooled, such as the data center, using indoor air.

[0072] Compared to traditional mechanical refrigeration using compressors 21, the indirect heat exchange system 1 utilizes the latent heat of vaporization of outdoor air for cooling, resulting in extremely low power consumption and significantly reduced operating costs, achieving the goals of energy efficiency optimization and energy saving.

[0073] In existing technologies, cooling units utilize heat exchange cores to achieve heat exchange between outdoor and indoor air. However, the presence of the heat exchange cores hinders the flow of outdoor and indoor air, increasing the energy consumption of the cooling unit. During winter use, the heat exchange cores are prone to condensation, water accumulation, freezing, and cracking, and are also highly susceptible to bacterial and scale growth, which can negatively impact the heat exchange efficiency of the cores and thus the energy efficiency of the cooling unit.

[0074] In this application, the indirect heat exchange system 1 described above replaces the conventional heat exchange core, which not only enables heat exchange between outdoor and indoor air to ensure the cooling effect of the indoor air, but also effectively reduces the flow resistance of indoor and outdoor air by the indoor coil 11 and the outdoor coil 12, thereby reducing the energy consumption of the cooling unit 100 and achieving energy saving.

[0075] Outdoor air and indoor air exchange heat indirectly through a circulating heat exchange medium. In winter, indoor air exchanges heat with indoor coil 11. The indoor air flows over the outer surface of indoor coil 11, and the heat exchange medium inside indoor coil 11 is in a flowing state under the action of circulating water pump 13. This can avoid the risks of water accumulation, freezing and cracking, bacterial growth and scale, thereby ensuring the heat exchange efficiency and energy efficiency of cooling unit 100, and facilitating maintenance.

[0076] The indoor coil 11 and the outdoor coil 12 can be copper tube finned dry cooling coils, that is, the heat exchange tubes are copper tubes. The indirect heat exchange system 1 with indoor coil 11 and outdoor coil 12 replaces the conventional heat exchange core. Under the same heat exchange area, the overall size of indoor coil 11 and outdoor coil 12 is reduced by more than 50%, which can save space and help optimize the structural layout of the cooling unit 100.

[0077] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the indirect heat exchange system 1 also includes a spray system 14. The spray system 14 is located in the outdoor space 62 and is used to spray water onto the outdoor coil 12.

[0078] The spray system 14 keeps the surface of the outdoor coil 12 moist. The sprayed water evaporates and absorbs heat on the surface of the outdoor coil 12, which can effectively reduce the temperature of the heat exchange medium in the outdoor coil 12. The cooled heat exchange medium enters the indoor coil 11 under the drive of the circulating water pump 13, which can relatively increase the temperature difference between the heat exchange medium in the indoor coil 11 and the indoor air. The heat exchange medium exchanges heat indirectly with the indoor air through the indoor coil 11, which improves the heat exchange effect between the indoor coil 11 and the indoor air and better realizes the cooling of the indoor air. This can improve the cooling effect of the indoor air on the equipment to be cooled, such as the data center.

[0079] Compared to the outdoor coil 12 which only exchanges heat with the outdoor air, the heat transfer performance of the outdoor coil 12 can be enhanced by setting up the spray system 14, thereby improving the cooling efficiency of the heat exchange medium at the outdoor coil 12 and thus improving the cooling effect and cooling efficiency of the indirect heat exchange system 1.

[0080] Compared to traditional mechanical refrigeration using compressors 21, the indirect heat exchange system 1 with spray system 14 utilizes the latent heat of vaporization of outdoor wind and water to achieve efficient cooling with extremely low power consumption, which can significantly reduce operating costs and achieve energy saving.

[0081] Furthermore, the spray system 14 is used to spray water onto the outdoor coil 12. With the same heat exchange area, the overall size of the outdoor coil 12 is smaller than that of the heat exchange core, which is more conducive to the spraying effect of the spray system 14. Optimal spraying effect can be achieved using a smaller volume of water, thereby saving spraying water.

[0082] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the sprinkler system 14 includes a water tank 141, a sprinkler device 142, and a sprinkler pump 143. The sprinkler device 142 is connected to the water tank 141 and is used to spray water onto the outdoor coil 12. The sprinkler pump 143 is connected between the water tank 141 and the sprinkler device 142 and is used to drive the water in the water tank 141 to flow to the sprinkler device 142. The water tank 141 serves to store and supply water. The water tank 141 is used to store the sprinkler water required by the sprinkler system 14 and supply water to the sprinkler device 142. The sprinkler device 142 is connected to the water tank 141. The sprinkler pump 143 can increase the driving force for the water flow, pressurize the water in the water tank 141 and deliver it to the sprinkler device 142, and then the sprinkler device 142 sprays it onto the surface of the outdoor coil 12. The combination of water tank 141, spray device 142 and spray water pump 143 ensures sufficient spray volume and spray range, thereby achieving a stable and efficient cooling effect.

[0083] In some embodiments of the present invention, the spray device 142 includes a manifold extending along the length of the outdoor coil 12 and connected at one end to a water tank 141. The manifold has multiple spray holes facing the outdoor coil 12 and spaced apart along its length. A spray pump 143 pumps water from the water tank 141 into the manifold and then sprays it onto the surface of the outdoor coil 12 through the multiple spray holes. The multiple spray holes spaced apart along the length of the manifold provide a wider spray coverage, ensuring that water evenly covers the entire surface of the outdoor coil 12, avoiding uneven water distribution, and thus improving the overall heat exchange efficiency of the outdoor coil 12.

[0084] In some embodiments of the present invention, the spray device 142 further includes a plurality of nozzles, which are respectively disposed at a plurality of spray holes. The nozzles can atomize water into fine water droplets. Compared with only spray holes, the surface area of ​​the atomized water droplets is greatly increased, which can accelerate the evaporation and heat absorption process, thereby improving the cooling efficiency. The atomized water sprayed from the nozzles can evenly cover the outer surface of the outdoor coil 12, which can prevent water flow concentration and uneven wetting, thereby ensuring the consistency of the evaporative cooling effect throughout the outdoor coil 12, and thus improving the overall heat exchange efficiency of the outdoor coil 12.

[0085] In some embodiments of the present invention, the sprinkler system 14 further includes a water receiving tray located below the outdoor coil 12 and connected to the water tank 141. The sprinkler pump 143 pressurizes and delivers water from the water tank 141 to the sprinkler device 142, which then sprays the water onto the surface of the outdoor coil 12. The water receiving tray collects excess spray water that has not evaporated and stores it in the water tank 141 for subsequent water supply, thus achieving a closed loop. This allows for the recycling of water resources, reducing water waste and ensuring the continuous operation of the sprinkler system 14.

[0086] Optionally, the water tray and water tank 141 are integrated into one piece, which improves the compactness of the cooling unit 100 and reduces its size.

[0087] In some embodiments of the present invention, at least one of the indoor coil 11 and the outdoor coil 12 includes a heat exchange tube and fins, with the fins connected to the outside of the heat exchange tube. The heat exchange medium flows inside the heat exchange tube, and the fins located outside the heat exchange tube increase the contact area between the outer wall of the heat exchange tube and air, thereby improving the heat exchange efficiency between the heat exchange medium and air. Specifically, the heat exchange tube is connected to the heat exchange loop formed by connecting the indoor coil 11 and the outdoor coil 12 end-to-end.

[0088] Optionally, the indoor coil 11 and the outdoor coil 12 are copper tube finned dry cooling coils, that is, the heat exchange tubes are copper tubes.

[0089] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the cooling unit 100 also includes a refrigeration system 2, which includes a compressor 21, an outdoor heat exchanger 22, and an indoor heat exchanger 23. The compressor 21, the outdoor heat exchanger 22, and the indoor heat exchanger 23 are connected to form a refrigeration circuit. The compressor 21 and the indoor heat exchanger 23 are located in the indoor space 61, and the outdoor heat exchanger 22 is located in the outdoor space 62.

[0090] Specifically, the exhaust port of compressor 21 is connected to one end of indoor heat exchanger 23, the return port of compressor 21 is connected to one end of outdoor heat exchanger 22, and the other end of indoor heat exchanger 23 is connected to the other end of outdoor heat exchanger 22, thereby forming a refrigeration circuit.

[0091] Furthermore, the refrigeration system 2 also includes a throttling device 25, which is located between the indoor heat exchanger 23 and the outdoor heat exchanger 22.

[0092] During the specific operation of the refrigeration system 2, the compressor 21 compresses the refrigerant into a high-temperature, high-pressure gas. The high-temperature, high-pressure gaseous refrigerant flows through the exhaust port of the compressor 21 to the outdoor heat exchanger 22. The outdoor heat exchanger 22 can exchange heat with the outdoor air and dissipate heat through condensation. After heat exchange in the outdoor heat exchanger 22, the refrigerant flows to the indoor heat exchanger 23 after being throttled and depressurized by the throttling device 25. The refrigerant evaporates and absorbs heat in the indoor heat exchanger 23, thereby cooling the space where the indoor heat exchanger 23 is located, and thus cooling the equipment to be cooled. The refrigerant that has completed heat exchange in the indoor heat exchanger 23 flows back to the exhaust port of the compressor 21 for the next cycle, thus forming a refrigerant cycle in the refrigeration circuit.

[0093] Cooling system 2 offers superior cooling performance compared to indirect heat exchange system 1. When outdoor wet-bulb temperatures are excessively high, such as in sweltering summer weather, the cooling efficiency of indirect heat exchange system 1 decreases, failing to meet the cooling demands of indoor environments like data centers. In such cases, cooling system 2 can be switched on or superimposed to ensure stable cooling capacity and meet the temperature requirements of the air supplied to the equipment being cooled. In cold, dry weather, indirect heat exchange system 1 can operate independently, resulting in significant energy savings. Through the complementary advantages of indirect heat exchange system 1 and cooling system 2, cooling unit 100 can adapt to various climates throughout the year, significantly improving its adaptability, energy efficiency, and reliability.

[0094] In some embodiments, the refrigeration system 2 further includes an electronic expansion valve that adjusts its opening according to the evaporation superheat, thereby regulating the flow of refrigerant to ensure that the refrigerant in the evaporator can be completely evaporated while maintaining an appropriate superheat.

[0095] In some embodiments of the present invention, multiple compressors 21 are connected in parallel. Thus, the refrigerant is compressed into a high-temperature, high-pressure gas by the multiple compressors 21. The high-pressure gaseous refrigerant flows through the exhaust ports of the multiple compressors 21 to a manifold valve, and then flows together to the outdoor heat exchanger 22. After absorbing heat in the indoor heat exchange tubes, the low-pressure gaseous refrigerant splits into multiple branches and returns to each compressor 21 for further compression.

[0096] Operating multiple compressors 21 in parallel can improve the energy efficiency of the refrigeration system 2. By starting and stopping some compressors 21, the load can be matched as needed. Compared with a single compressor 21, which needs to be frequently started, stopped, or unloaded at low loads, multiple compressors 21 in parallel can reduce energy waste through control of the number of units. In addition, when a compressor 21 fails, the remaining compressors 21 can continue to operate, maintaining a portion of the cooling capacity and preventing the refrigeration system 2 from completely failing, thereby improving the operational stability and reliability of the cooling unit 100.

[0097] It should be noted that this application does not specify the exact number of compressors 21, wherein compressor 21 can be a conventional rotary compressor.

[0098] In some embodiments of the present invention, there is only one compressor 21, which is a magnetic levitation compressor 21. The magnetic levitation compressor 21 employs electromagnetic bearing technology, using the magnetic field force generated by an electromagnet to levitate the rotor in the air, eliminating physical contact with the stator and thus eliminating mechanical friction. This avoids the mechanical friction losses of traditional scroll compressors 21, reducing energy loss and improving energy efficiency. Existing traditional compressors 21 rely on lubricating oil, and long-term operation may lead to oil film thermal resistance in the outdoor heat exchanger 22, thereby reducing heat exchange efficiency. The magnetic levitation compressor 21 operates without oil, avoiding lubricating oil contamination, improving heat exchange efficiency, and eliminating the need to replace refrigerant oil, thus reducing maintenance costs.

[0099] In some embodiments, the refrigeration system 2 further includes a gas-liquid separator located between the return port of the compressor 21 and the indoor heat exchanger 23. The gas-liquid separator can separate the liquid refrigerant from the gaseous refrigerant, trapping the liquid refrigerant at the bottom and allowing only the gaseous refrigerant to enter the compressor 21, thereby avoiding the risk of liquid slugging, protecting the compressor 21, and extending the service life of the compressor 21.

[0100] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the indoor coil 11 and indoor heat exchanger 23 are arranged sequentially along the airflow direction, allowing the airflow to first pass through the indoor coil 11 for primary cooling, and then through the indoor heat exchanger 23 for secondary cooling. This maximizes the utilization of the indirect heat exchange system 1, thereby saving energy. Furthermore, it better ensures the heat exchange efficiency at the indoor coil 11 and indoor heat exchanger 23, thus improving the cooling efficiency of the cooling unit 100. Simultaneously, it allows for a compact structure of the cooling unit 100, saving space.

[0101] In some embodiments of the present invention, such as Figure 1 and Figure 2As shown, the outdoor space 62 has an outdoor air inlet 66 and an outdoor air outlet 67, and the cooling unit 100 also includes an outdoor fan 3. The outdoor fan 3 drives airflow from the outdoor air inlet 66 to the outdoor air outlet 67. Thus, the outdoor fan 3 provides power for the airflow, forcibly drawing outdoor air through the outdoor coil 12 and / or the outdoor heat exchanger 22. Through evaporative cooling, the surface temperature of the outdoor coil 12 and / or the outdoor heat exchanger 22 is reduced, thereby cooling the heat exchange medium and / or refrigerant. This ensures the operation of the indirect heat exchange system 1 and the refrigeration system 2, thereby guaranteeing the stable operation and cooling effect of the cooling unit 100.

[0102] Therefore, when the cooling unit 100 is running in dry mode, the outdoor fan 3 is running; when the cooling unit 100 is running in direct ventilation mode, the outdoor fan 3 is shut down, so that the outdoor air entering the outdoor space 62 from the outdoor air inlet 66 can enter the indoor space 61 through the fresh air inlet 63.

[0103] Meanwhile, in this application, the heat exchange between the outdoor and indoor air is achieved by replacing the conventional heat exchange core with the indirect heat exchange system 1. The indoor coil 11 and the outdoor coil 12 can effectively reduce the flow resistance of the indoor and outdoor air, thereby reducing the energy consumption of the outdoor fan 3 and improving the energy efficiency of the cooling unit 100, thus achieving the purpose of energy saving.

[0104] In addition, when the outdoor fan 3 is running, the power of the outdoor fan 3 can be adjusted according to the outdoor inlet wet-bulb temperature and the outdoor inlet dry-bulb temperature to adjust the cooling effect of the cooling unit 100 on the equipment to be cooled, thereby improving the adaptability, energy efficiency and reliability of the cooling unit 100.

[0105] In some embodiments of the present invention, such as Figure 1 As shown, along the airflow direction, the outdoor coil 12 and the outdoor heat exchanger 22 are arranged sequentially. The outdoor heat exchanger 22 has a heat exchange flow path connected in series between the compressor 21 and the indoor heat exchanger 23. This allows the airflow to first pass through the outdoor coil 12 to cool the heat exchange medium, and then pass through the outdoor heat exchanger 22 to cool the refrigerant. This maximizes the utilization of the indirect heat exchange system 1, thereby saving energy. Furthermore, it better ensures the heat exchange efficiency at the outdoor coil 12 and the outdoor heat exchanger 22, thus improving the cooling efficiency of the cooling unit 100. Simultaneously, it allows for a compact structure of the cooling unit 100, saving space.

[0106] Furthermore, the outdoor heat exchanger 22 has a heat exchange flow path connected in series between the compressor 21 and the indoor heat exchanger 23. Specifically, the outdoor heat exchanger 22 can be a refrigerant coil.

[0107] In some embodiments of the present invention, such as Figure 2As shown, the indoor coil 11 and the outdoor coil 12 are connected end to end to form a heat exchange loop. The outdoor heat exchanger 22 has a first heat exchange flow path and a second heat exchange flow path for mutual heat exchange. The first heat exchange flow path is connected in series between the compressor 21 and the indoor heat exchanger 23, and the second heat exchange flow path is connected in parallel to the heat exchange flow path and is located downstream of the indoor coil 11 and upstream of the outdoor coil 12.

[0108] Understandably, during the specific operation of the refrigeration system 2, the compressor 21 compresses the refrigerant into a high-temperature, high-pressure gas. This high-temperature, high-pressure gaseous refrigerant flows through the exhaust port of the compressor 21 to the outdoor heat exchanger 22. The outdoor heat exchanger 22 can exchange heat with the outdoor air, condensing and dissipating heat. After heat exchange in the outdoor heat exchanger 22, the refrigerant is throttled and depressurized by the throttling device 25 before flowing to the indoor heat exchanger 23. The refrigerant evaporates and absorbs heat in the indoor heat exchanger 23, cooling the space where the indoor heat exchanger 23 is located, thereby cooling the equipment to be cooled. The refrigerant that has completed heat exchange in the indoor heat exchanger 23 flows back to the exhaust port of the compressor 21 for the next cycle, thus forming a refrigerant cycle in the refrigeration circuit.

[0109] Thus, the outdoor heat exchanger 22 has a first heat exchange flow path and a second heat exchange flow path for mutual heat exchange. The first heat exchange flow path is connected in series between the compressor 21 and the indoor heat exchanger 23, and the second heat exchange flow path is connected in parallel to the heat exchange flow path and is located downstream of the indoor coil 11 and upstream of the outdoor coil 12. This allows the heat exchange medium and refrigerant to exchange heat within the outdoor heat exchanger 22. The temperature of the heat exchange medium flowing out of the indoor coil 11 is lower than the temperature of the refrigerant flowing out of the compressor 21, which can achieve cooling of the refrigerant by the heat exchange medium, thereby improving the condensation efficiency of the refrigerant within the outdoor heat exchanger 22.

[0110] Compared to the refrigerant only exchanging heat with the outdoor air in the outdoor heat exchanger, by setting up an outdoor heat exchanger 22 with a first heat exchange flow path and a second heat exchange flow path for mutual heat exchange, the temperature difference between the heat exchange medium and the refrigerant can be used to improve the condensation efficiency of the refrigerant in the outdoor heat exchanger 22, thereby improving the cooling effect and cooling efficiency of the cooling unit 100 and achieving the purpose of energy saving and consumption reduction.

[0111] Optionally, the outdoor heat exchanger 22 is a plate heat exchanger.

[0112] Furthermore, such as Figure 1 and Figure 2As shown, the indirect heat exchange system 1 also includes a three-way valve 15, which is located between the indoor coil 11 and the outdoor coil 12. The three-way valve 15 has a first port 151, a second port 152, and a third port 153. The first port 151 is connected to at least one of the second port 152 and the third port 153. The first port 151 and the second port 152 are connected to the indoor coil 11 and the outdoor coil 12, respectively. The third port 153 is connected to the second heat exchange flow path. By providing the third-way valve 15, it is convenient to control the opening and closing of the second heat exchange flow path. When the refrigeration system 2 is not working and the indirect heat exchange system 1 is working, the first port 151 is only connected to the second port 152. When the refrigeration system 2 is working and the indirect heat exchange system 1 is working, the first port 151 is connected to the second port 152 and the third port 153.

[0113] Meanwhile, when the first port 151 is connected to the third port 153, the flow rate to the outdoor heat exchanger 22 can be adjusted according to the pressure in the indoor coil 11 by controlling the opening degree of the third port 153, thereby adjusting the cooling effect of the cooling unit 100 on the equipment to be cooled, so as to improve the adaptability, energy efficiency and reliability of the cooling unit 100.

[0114] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the flow directions of the first heat exchange path and the second heat exchange path are opposite. Therefore, this arrangement improves the heat exchange efficiency between the heat exchange medium in the first heat exchange path and the heat exchange medium in the second heat exchange path, thereby enhancing the cooling effect and efficiency of the cooling unit 100.

[0115] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, multiple outdoor fans 3 are spaced apart. Simultaneous operation of multiple outdoor fans 3 enhances the uniformity of airflow. The spaced arrangement of multiple outdoor fans 3 covers a larger area, thereby expanding the range of airflow and improving the cooling effect and heat exchange efficiency of the outdoor coil 12 and / or the outdoor heat exchanger 22. Furthermore, when one outdoor fan 3 fails, the remaining outdoor fans 3 can continue to operate to maintain the cooling capacity of the outdoor coil 12 and / or the outdoor heat exchanger 22, preventing the indirect heat exchange system 1 and the refrigeration system 2 from shutting down, and improving the operational stability and reliability of the cooling unit 100.

[0116] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the shell has a partition to divide the space inside the shell into an outdoor space 62 and an indoor space 61 arranged in a horizontal direction. A fresh air inlet 63 is located on the partition, and an indoor air inlet 64 and an indoor air outlet 65 are located on the shell. The shell is also provided with an outdoor air inlet 66 and an outdoor air outlet 67 that communicate with the outdoor space 62.

[0117] When the cooling unit 100 operates in dry mode, the indoor fan 24 runs, the fresh air inlet 63 is closed, the indoor air inlet 64 is open, and the indoor air outlet 65 is open, allowing heat exchange between the indoor coil 11 and the outdoor coil 12. In the outdoor space 62, outdoor air flows through the outdoor coil 12 and exchanges heat with it. Then, the indoor coil 11 exchanges heat with the outdoor coil 12. Indoor air enters the indoor space 61 through the indoor air inlet 64. In the indoor space 61, indoor air flows through the indoor coil 11 and exchanges heat with the outdoor coil 12. The cooled indoor air flows from the indoor air outlet 65 to the equipment to be cooled, thus achieving cooling of the indoor air through the indirect heat exchange system 1, thereby cooling the equipment to be cooled by the cooling unit 100.

[0118] When the cooling unit 100 operates in direct ventilation mode, the indoor coil 11 and outdoor coil 12 stop working, the indoor fan 24 runs, the fresh air inlet 63 opens, the indoor air inlet 64 opens, and the indoor air outlet 65 opens. Outdoor air enters the outdoor space 62 and directly enters the indoor space 61 via the fresh air inlet 63, or outdoor air directly enters the indoor space 6162 via the fresh air inlet 63. The cooler outdoor air entering from the fresh air inlet 63 mixes with the indoor air entering the indoor space 61 via the indoor air inlet 64 and flows from the indoor air outlet 65 to the equipment to be cooled. Thus, the outdoor air directly cools the indoor air, thereby achieving the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0119] Specifically, the outdoor coil 12 includes a first coil and a second coil. The first coil and the second coil are V-shaped and their upper surfaces are inclined in opposite directions. The outdoor air outlet 67 is located above the first coil and the second coil and between the first coil and the second coil. This can expand the heat exchange area between the outdoor air and the outdoor coil 12, thereby ensuring heat exchange efficiency.

[0120] Furthermore, the outdoor coil 12 is arranged in multiple groups at intervals, each group of outdoor coil 12 includes a first coil and a second coil, and there are multiple outdoor air outlets 67, with each group of outdoor coil 12 being arranged opposite to at least one outdoor air outlet 67.

[0121] The indoor coil 11 and the indoor heat exchanger 23 are located between the indoor air inlet 64 and the indoor air outlet 65. Both the indoor coil 11 and the indoor heat exchanger 23 are flat and have the same shape and size as the indoor air outlet 65. This ensures that the indoor air can be cooled by the indoor coil 11 and the indoor heat exchanger 23 before it can flow out of the indoor air outlet 65, thus ensuring the cooling effect.

[0122] The following describes a control method for a cooling unit 100 according to an embodiment of the present invention, wherein the cooling unit 100 is the cooling unit 100 described above.

[0123] like Figures 1-3 As shown, the control method of the cooling unit 100 according to an embodiment of the present invention includes:

[0124] Obtain the outdoor intake air dry-bulb temperature Td. Therefore, by first obtaining the outdoor intake air dry-bulb temperature Td, different cooling modes of the cooling unit 100 can be selected based on the outdoor intake air dry-bulb temperature Td. This effectively reduces the overall energy consumption of the cooling unit 100 while cooling the equipment to be cooled, achieving energy savings. It should be noted that the outdoor intake air dry-bulb temperature Td is the dry-bulb temperature of the outdoor air flowing to the outdoor coil 12.

[0125] Determine that the outdoor intake dry bulb temperature Td is less than or equal to the outdoor intake switching temperature To2, control the cooling unit 100 to operate in dry mode, exchange heat through the indoor coil 11 and the outdoor coil 12, operate the indoor fan 24, close the fresh air inlet 63, open the indoor air inlet 64, and open the indoor air outlet 65.

[0126] It is understandable that by comparing the outdoor intake dry-bulb temperature Td obtained through the above steps with the outdoor intake switching temperature To2, if it is determined that the outdoor intake dry-bulb temperature Td is less than or equal to the outdoor intake switching temperature To2, it can be determined that the outdoor environment is low-temperature. The indirect heat exchange system 1 can utilize the low-temperature outdoor air for cooling, thereby reducing power consumption and operating costs, and achieving the purpose of energy efficiency optimization and energy saving. Therefore, the cooling unit 100 is controlled to operate in dry mode, so that the indoor fan 24 is running, the fresh air inlet 63 is closed, the indoor air inlet 64 is open, and the indoor air outlet 65 is open. Heat exchange occurs through the indoor coil 11 and the outdoor coil 12, thereby achieving the cooling effect of the indoor air through the indirect heat exchange system 1, and thus achieving the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0127] Specifically, in the outdoor space 62, the outdoor airflow exchanges heat with the outdoor coil 12, and then the indoor coil 11 exchanges heat with the outdoor coil 12. The indoor air enters the indoor space 61 from the indoor air inlet 64. In the indoor space 61, the indoor airflow exchanges heat with the outdoor coil 12 through the indoor coil 11. The cooled indoor air flows from the indoor air outlet 65 to the equipment to be cooled, thereby achieving the cooling of the indoor air through the indirect heat exchange system 1, and thus achieving the cooling of the equipment to be cooled by the cooling unit 100.

[0128] Furthermore, the cooling unit 100 is equipped with a processor and a temperature sensor. The temperature sensor is used to measure the outdoor intake dry-bulb temperature Td. The processor is connected to the temperature sensor and transmits the measured temperature signal to the processor. The processor then determines the relationship between the outdoor intake dry-bulb temperature Td and the outdoor intake switching temperature To2, and controls the operating mode of the cooling unit 100 based on the determination.

[0129] Furthermore, the cooling unit 100 is also equipped with a controller. The processor is connected to the controller for communication. When the processor determines that the outdoor inlet dry bulb temperature Td is less than or equal to the outdoor inlet switching temperature To2, the processor sends a signal to the controller, causing the controller to control the indoor coil 11 and the outdoor coil 12 to exchange heat, the indoor fan 24 to run, the fresh air inlet 63 to close, the indoor air inlet 64 to open, and the indoor air outlet 65 to open, thereby controlling the cooling unit 100 to operate in dry mode.

[0130] In some embodiments, such as Figure 1 and Figure 2 As shown, the outdoor space 62 has an outdoor air inlet 66 and an outdoor air outlet 67, and the cooling unit 100 also includes an outdoor fan 3. The outdoor fan 3 drives airflow from the outdoor air inlet 66 to the outdoor air outlet 67. Therefore, when the cooling unit 100 is operated in dry mode, the outdoor fan 3 operates, providing power for the airflow. The outdoor fan 3 forcibly draws outdoor air through the outdoor coil 12 and / or the outdoor heat exchanger 22, reducing the surface temperature of the outdoor coil 12 and / or the outdoor heat exchanger 22 through evaporative cooling, thereby cooling the heat exchange medium and / or refrigerant. This ensures the operation of the indirect heat exchange system 1 and the refrigeration system 2, thus guaranteeing the stable operation and cooling effect of the cooling unit 100.

[0131] According to the control method of the cooling unit 100 of the present invention, by determining that the outdoor inlet dry bulb temperature Td is less than or equal to the outdoor inlet switching temperature To2, the cooling unit 100 is controlled to operate in dry mode, and heat exchange is carried out through the indoor coil 11 and the outdoor coil 12. The indoor fan 24 is running, the fresh air inlet 63 is closed, the indoor air inlet 64 is opened, and the indoor air outlet 65 is opened. In this way, the indoor air is cooled down through the indirect heat exchange system 1, thereby achieving the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0132] In some embodiments of the present invention, such as Figures 1-3 As shown, the control method also includes:

[0133] Determine that the outdoor intake dry bulb temperature Td is greater than the outdoor intake switching temperature To2 and less than or equal to the outdoor intake switching temperature To1, where To2 < To1. Obtain the supply air humidity Tw1 of the equipment to be cooled, and determine that the supply air humidity Tw1 of the equipment to be cooled is greater than or equal to Twset-10% and less than or equal to Twset+10%, where Twset is the supply air set humidity of the equipment to be cooled.

[0134] Understandably, the outdoor intake dry-bulb temperature Td obtained through the above steps is compared with the outdoor intake switching temperatures To2 and To1. If the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To2 and less than or equal to the outdoor intake switching temperature To1, it indicates that the outdoor temperature is moderate and lower than the ambient temperature of the equipment to be cooled. Then, the supply air humidity Tw1 of the equipment to be cooled is compared with the humidity range of the supply air set humidity Twset of the equipment to be cooled. If the supply air humidity Tw1 of the equipment to be cooled is greater than or equal to Twset-10% and less than or equal to Twset+10%, it indicates that the humidity control of the environment where the equipment to be cooled is good, and outdoor air can be directly introduced to achieve the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0135] The cooling unit 100 is controlled to operate in direct ventilation mode, the indoor coil 11 and the outdoor coil 12 stop working, the indoor fan 24 runs, the fresh air inlet 63 is opened, the indoor air inlet 64 is opened, and the indoor air outlet 65 is opened.

[0136] Therefore, if the outdoor intake dry bulb temperature Td is greater than the outdoor intake switching temperature To2 and less than or equal to the outdoor intake switching temperature To1, and the supply air humidity Tw1 of the equipment to be cooled is greater than or equal to Twset-10% and less than or equal to Twset+10%, the outdoor air can be used to directly cool and reduce the indoor air temperature, thereby achieving the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0137] Specifically, outdoor air enters the outdoor space 62 and directly enters the indoor space 61 via the fresh air inlet 63, or outdoor air directly enters the indoor space 6162 via the fresh air inlet 63. The cooler outdoor air entering from the fresh air inlet 63 mixes with the indoor air entering the indoor space 61 from the indoor air inlet 64 and flows from the indoor air outlet 65 to the equipment to be cooled. This achieves direct cooling of the indoor air by the outdoor air, thereby cooling the equipment to be cooled by the cooling unit 100. At the same time, since the indoor coil 11 and outdoor coil 12 in the direct ventilation mode stop working, the overall energy consumption of the cooling unit 100 can be reduced while ensuring the temperature and humidity of the equipment to be cooled, thus achieving energy saving.

[0138] It should be noted that the outdoor air intake switching temperature To1 and the outdoor air intake switching temperature To2 are preset temperatures.

[0139] In some embodiments, such as Figure 1 and Figure 2 As shown, the outdoor space 62 has an outdoor air inlet 66 and an outdoor air outlet 67, and the cooling unit 100 also includes an outdoor fan 3. The outdoor fan 3 drives airflow from the outdoor air inlet 66 to the outdoor air outlet 67. Therefore, when the cooling unit 100 is operated in direct ventilation mode, the outdoor fan 3 stops, allowing outdoor air entering the outdoor space 62 from the outdoor air inlet 66 to enter the indoor space 61 via the fresh air inlet 63.

[0140] In some embodiments of the present invention, such as Figures 1-3 As shown, the control method also includes:

[0141] The supply air humidity Tw1 of the equipment to be cooled is determined to be less than Twset-10% or greater than Twset+10%. This means that the outdoor inlet dry-bulb temperature Td obtained through the above steps is compared with the outdoor inlet switching temperatures To2 and To1. If the outdoor inlet dry-bulb temperature Td is greater than the outdoor inlet switching temperature To2 and less than or equal to the outdoor inlet switching temperature To1, it indicates that the outdoor temperature is moderate and lower than the ambient temperature of the equipment to be cooled. Then, the supply air humidity Tw1 of the equipment to be cooled is compared with the humidity range of the equipment's supply air set humidity Twset. If the supply air humidity Tw1 is less than Twset-10% or greater than Twset+10%, it indicates that the supply air humidity of the equipment to be cooled is out of range. In this case, outdoor air cannot be directly introduced to achieve the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0142] The cooling unit 100 is controlled to operate in dry mode, and heat exchange is carried out through the indoor coil 11 and the outdoor coil 12. The indoor fan 24 is running, the fresh air inlet 63 is closed, the indoor air inlet 64 is open, and the indoor air outlet 65 is open.

[0143] Therefore, when the outdoor intake dry bulb temperature Td is determined to be greater than the outdoor intake switching temperature To2 and less than or equal to the outdoor intake switching temperature To1, and the supply air humidity Tw1 of the equipment to be cooled is determined to be less than Twset-10% or greater than Twset+10%, the cooling unit 100 is controlled to operate in dry mode, and heat is exchanged through the indoor coil 11 and the outdoor coil 12. The indoor air is cooled and reduced through the indirect heat exchange system 1, thereby achieving the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0144] Specifically, in the outdoor space 62, the outdoor airflow exchanges heat with the outdoor coil 12, and then the indoor coil 11 exchanges heat with the outdoor coil 12. The indoor air enters the indoor space 61 from the indoor air inlet 64. In the indoor space 61, the indoor airflow exchanges heat with the outdoor coil 12 through the indoor coil 11. The cooled indoor air flows from the indoor air outlet 65 to the equipment to be cooled, thereby achieving the cooling of the indoor air through the indirect heat exchange system 1, and thus achieving the cooling of the equipment to be cooled by the cooling unit 100.

[0145] Therefore, the control method of the cooling unit 100 of this application can select different cooling modes according to the outdoor inlet dry bulb temperature Td and the supply air humidity of the equipment to be cooled, so as to reduce the overall energy consumption of the cooling unit 100 while cooling the equipment to be cooled, thus achieving energy saving.

[0146] In some embodiments of the present invention, such as Figures 1-3 As shown, the indirect heat exchange system 1 also includes a spray system 14, which is used to spray water onto the outdoor coil 12. The control method further includes:

[0147] It is determined that the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To1. It is understood that by determining that the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To1, it indicates that the outdoor temperature is high. At this time, the cooling unit 100, operating in dry mode or direct ventilation mode, cannot meet the cooling effect required for the equipment to be cooled.

[0148] It is determined that the outdoor inlet wet-bulb temperature Tw is less than or equal to the outdoor inlet switching wet-bulb temperature Two. Understandably, the spray system 14 keeps the surface of the outdoor coil 12 moist. The sprayed water evaporates and absorbs heat on the surface of the outdoor coil 12, effectively reducing the temperature of the heat exchange medium inside the outdoor coil 12. The cooled heat exchange medium enters the indoor coil 11, where it indirectly exchanges heat with the indoor air, thus cooling the indoor air. Therefore, if the outdoor inlet wet-bulb temperature Tw is determined to be less than or equal to the outdoor inlet switching wet-bulb temperature Two, the evaporative cooling effect of the spray system 14 is good, and the spray system 14 can be turned on to improve the cooling effect of the cooling unit 100 on the equipment to be cooled.

[0149] Furthermore, the temperature sensor is also used to measure the outdoor intake air wet-bulb temperature Tw. The temperature sensor transmits the measured outdoor intake air dry-bulb temperature Td to the processor. When the processor determines that the outdoor intake air dry-bulb temperature Td is greater than the outdoor intake air switching temperature To, the temperature sensor measures the outdoor intake air wet-bulb temperature Tw and transmits it to the processor.

[0150] It should be noted that the outdoor intake wet-bulb temperature Tw is the wet-bulb temperature of the outdoor air flowing to the outdoor coil 1212.

[0151] The cooling unit 100 is controlled to operate in wet mode, with the indoor coil 11 and outdoor coil 12 operating, the spray system 14 activated, the indoor fan 24 running, the indoor air inlet 64 open, the indoor air outlet 65 open, and the fresh air inlet 63 closed. Thus, the spray system 14 keeps the surface of the outdoor coil 12 moist, and the sprayed water evaporates and absorbs heat on the surface of the outdoor coil 12, effectively reducing the temperature of the heat exchange medium inside the outdoor coil 12. The cooled heat exchange medium, driven by the circulating water pump 13, enters the indoor coil 11, relatively increasing the temperature difference between the heat exchange medium in the indoor coil 11 and the indoor air. The heat exchange medium indirectly exchanges heat with the indoor air through the indoor coil 11, improving the heat exchange effect between the indoor coil 11 and the indoor air, and better cooling the indoor air. This improves the cooling effect of the indoor air on equipment to be cooled, such as data centers.

[0152] Meanwhile, compared to the outdoor coil 12 only exchanging heat with the outdoor air when the cooling unit 100 operates in dry mode, the cooling unit 100 operates in wet mode, which enhances the heat transfer performance of the outdoor coil 12 through the spray system 14, improves the cooling efficiency of the heat exchange medium at the outdoor coil 12, and thus improves the cooling effect and cooling efficiency of the indirect heat exchange system 1.

[0153] In some embodiments of the present invention, such as Figures 1-3 As shown, the cooling unit 100 also includes a refrigeration system 2, which includes a compressor 21, an outdoor heat exchanger 22, and an indoor heat exchanger 23. The compressor 21, the outdoor heat exchanger 22, and the indoor heat exchanger 23 are connected to form a refrigeration circuit. The control method also includes:

[0154] It is determined that the outdoor intake wet-bulb temperature Tw is greater than the outdoor intake switching wet-bulb temperature Two. This is understandable because, after determining that the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To1, indicating a high outdoor temperature, and then determining that the outdoor intake wet-bulb temperature Tw is greater than the outdoor intake switching wet-bulb temperature Two, it indicates that the outdoor intake wet-bulb temperature and humidity are high, the air is close to saturation, and the heat removed by the evaporation of the spray system 14 is relatively small. At this point, the cooling efficiency of the indirect heat exchange system 1 decreases, and the cooling unit 100, operating only in wet mode, cannot meet the cooling effect required for the equipment to be cooled.

[0155] The cooling unit 100 is controlled to operate in a mixed mode, and the indoor coil 11 and outdoor coil 12 are operated, the spray system 14 is turned on, the compressor 21 is running, the fresh air inlet 63 is closed, the indoor fan 24 is running, the indoor air inlet 64 is opened, and the indoor air outlet 65 is opened.

[0156] Specifically, the spray system 14 keeps the surface of the outdoor coil 12 moist. The sprayed water evaporates and absorbs heat on the surface of the outdoor coil 12, which can effectively reduce the temperature of the heat exchange medium in the outdoor coil 12. The cooled heat exchange medium enters the indoor coil 11 under the drive of the circulating water pump 13, which can relatively increase the temperature difference between the heat exchange medium in the indoor coil 11 and the indoor air. The heat exchange medium exchanges heat indirectly with the indoor air through the indoor coil 11, which improves the heat exchange effect between the indoor coil 11 and the indoor air and better achieves the cooling of the indoor air.

[0157] Meanwhile, during the specific operation of the refrigeration system 2, the compressor 21 compresses the refrigerant into a high-temperature, high-pressure gas. The high-temperature, high-pressure gaseous refrigerant flows through the exhaust port of the compressor 21 to the outdoor heat exchanger 22. The outdoor heat exchanger 22 can exchange heat with the outdoor air and dissipate heat through condensation. After heat exchange in the outdoor heat exchanger 22, the refrigerant flows to the indoor heat exchanger 23 after being throttled and depressurized by the throttling device 25. The refrigerant evaporates and absorbs heat in the indoor heat exchanger 23, thereby cooling the space where the indoor heat exchanger 23 is located, and thus cooling the equipment to be cooled. The refrigerant that has completed heat exchange in the indoor heat exchanger 23 flows back to the exhaust port of the compressor 21 for the next cycle, thus forming a refrigerant cycle in the refrigeration circuit.

[0158] Therefore, by combining the advantages of indirect heat exchange system 1 and refrigeration system 2, the cooling effect of the cooling unit 100 on the equipment to be cooled can be improved, so that the cooling unit 100 can adapt to various climates throughout the year, and the adaptability, energy efficiency and reliability of the cooling unit 100 can be significantly improved.

[0159] In some embodiments, such as Figure 2 As shown, in the mixed-mode operation, the indoor coil 11 and outdoor coil 12 of the cooling unit 100 are connected end-to-end to form a heat exchange loop. The outdoor heat exchanger 22 has a first heat exchange flow path and a second heat exchange flow path for mutual heat exchange. The first heat exchange flow path is connected in series between the compressor 21 and the indoor heat exchanger 23, and the second heat exchange flow path is connected in parallel to the heat exchange flow path and is located downstream of the indoor coil 11 and upstream of the outdoor coil 12. It should be noted that when the outdoor inlet wet-bulb temperature Tw is high, it is impossible to cool down by evaporation through the spray system 14. At this time, the indoor coil 11 and outdoor coil 12 can be controlled to stop working to reduce the energy consumption of the cooling unit 100.

[0160] In some embodiments of the present invention, such as Figure 1 and Figure 3As shown, the cooling unit 100 also includes a refrigeration system 2, which includes a compressor 21, an outdoor heat exchanger 22, and an indoor heat exchanger 23. The compressor 21, the outdoor heat exchanger 22, and the indoor heat exchanger 23 are connected to form a refrigeration circuit. The outdoor heat exchanger 22 has a heat exchange flow path connected in series between the compressor 21 and the indoor heat exchanger 23. The control method also includes:

[0161] It is determined that the outdoor intake wet-bulb temperature Tw is greater than the outdoor intake switching wet-bulb temperature Two. This can be understood as follows: after determining that the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To1, indicating a high outdoor temperature, and then determining that the outdoor intake wet-bulb temperature Tw is greater than the outdoor intake switching wet-bulb temperature Two, it indicates that the outdoor intake wet-bulb temperature and humidity are high, the air is close to saturation, and the heat removed by the evaporation of the spray system 14 is relatively small. At this time, the cooling efficiency of the indirect heat exchange system 1 decreases, and the cooling unit 100, operating in wet mode, cannot meet the cooling effect required for the equipment to be cooled.

[0162] The cooling unit 100 is controlled to operate in pure mechanical refrigeration mode, the indoor coil 11 and outdoor coil 12 are stopped, the spray system 14 is turned off, the compressor 21 is running, the fresh air inlet 63 is closed, the indoor fan 24 is running, the indoor air inlet 64 is opened, and the indoor air outlet 65 is opened.

[0163] Therefore, the cooling unit 100 operates in a purely mechanical refrigeration mode. The compressor 21 compresses the refrigerant into a high-temperature, high-pressure gas. This high-temperature, high-pressure gaseous refrigerant flows through the exhaust port of the compressor 21 to the outdoor heat exchanger 22. The outdoor heat exchanger 22 can exchange heat with the outdoor air, condensing and dissipating heat. After heat exchange in the outdoor heat exchanger 22, the refrigerant is throttled and depressurized by the throttling device 25 before flowing to the indoor heat exchanger 23. The refrigerant evaporates and absorbs heat in the indoor heat exchanger 23, achieving cooling of the space where the indoor heat exchanger 23 is located, thereby cooling the equipment to be cooled. The refrigerant that has completed heat exchange in the indoor heat exchanger 23 flows back to the exhaust port of the compressor 21 for the next cycle, thus forming a refrigerant cycle in the refrigeration circuit, thereby improving the cooling effect of the cooling unit 100 on the equipment to be cooled. At the same time, since evaporative cooling through the spray system 14 is not possible, the indoor coil 11 and the outdoor coil 12 can be stopped and the spray system 14 can be shut down to reduce the energy consumption of the cooling unit 100.

[0164] In some embodiments of the present invention, such as Figures 1-3 As shown, the control method also includes:

[0165] When the outdoor intake air wet-bulb temperature Tw is less than or equal to the supply air set temperature Tset of the equipment to be cooled, the compressor 21 is controlled to run at the first frequency, where Tset > Two;

[0166] When the outdoor intake wet-bulb temperature Tw is greater than the supply air set temperature Tset of the equipment to be cooled, the compressor 21 is controlled to run at a second frequency, which is greater than the first frequency.

[0167] Understandably, the temperature sensor measures the outdoor intake wet-bulb temperature Tw and transmits it to the processor. When the processor determines that the outdoor intake wet-bulb temperature Tw is greater than the outdoor intake switching temperature Two and less than or equal to the supply air setting temperature Tset of the equipment to be cooled, the processor sends a signal to the controller, causing the controller to control the compressor 21 to run at the first frequency. When the processor determines that the outdoor intake wet-bulb temperature Tw is greater than the supply air setting temperature Tset of the equipment to be cooled, the processor sends a signal to the controller, causing the controller to control the compressor 21 to run at the second frequency.

[0168] When the outdoor inlet wet-bulb temperature Tw is greater than the supply air set temperature Tset of the equipment to be cooled, the outdoor temperature and humidity are too high. In this case, the compressor 21 must operate at a higher second frequency to increase the cooling capacity and meet the supply air temperature requirements. When the outdoor inlet wet-bulb temperature Tw is greater than the outdoor inlet switching temperature Two but less than or equal to the supply air set temperature Tset of the equipment to be cooled, the compressor 21 can operate at a slightly lower first frequency, which can ensure the cooling capacity requirement while achieving energy saving and consumption reduction.

[0169] It should be noted that the air supply set temperature Tset of the equipment to be cooled is a preset temperature.

[0170] In this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0171] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cooling unit, characterized in that The cooling unit comprises: a shell having a spaced indoor space and an outdoor space, the indoor space having a fresh air inlet, an indoor air inlet and an indoor air outlet; an indoor air fan for driving air flow from the indoor air inlet and the fresh air inlet to the indoor air outlet; an indirect heat exchange system comprising an indoor coil and an outdoor coil, the indoor coil being located in the indoor space, the outdoor coil being located in the outdoor space, the indoor coil and the outdoor coil being used for heat exchange.

2. Cooling pack according to claim 1, characterized in that a fresh air valve provided at the fresh air inlet for opening or closing the fresh air inlet; and / or, an indoor air valve provided at the indoor air inlet for opening or closing the indoor air inlet.

3. The cooling pack of claim 1, wherein, The indoor air fan is provided at the indoor air outlet.

4. The cooling pack of claim 1, wherein, The indoor air fan is a plurality of indoor air fans arranged in a spaced manner.

5. The cooling pack of claim 1, wherein, The indoor coil and the outdoor coil are connected in series to form a heat exchange loop, and the indirect heat exchange system further comprises: a circulating water pump provided on the heat exchange loop for driving the circulating flow of the heat exchange medium between the indoor coil and the outdoor coil.

6. The cooling pack of claim 1, wherein, The indirect heat exchange system further comprises: a spraying system provided in the outdoor space for spraying water to the outdoor coil.

7. The cooling pack of claim 6, wherein, The spraying system comprises: a water tank; a spraying device connected with the water tank, the spraying device being used for spraying water to the outdoor coil; a spraying water pump connected between the water tank and the spraying device for driving the water in the water tank to flow to the spraying device.

8. The cooling pack of claim 7, wherein, The spraying device comprises: a collecting pipe extending along the length direction of the outdoor coil and having one end communicated with the water tank, a plurality of spraying holes being provided on the collecting pipe and arranged in a spaced manner along the length direction of the collecting pipe.

9. The cooling pack of claim 8, wherein, The spraying device further comprises a plurality of nozzles, the nozzles being respectively provided at the spraying holes.

10. The cooling unit of claim 7, wherein, The spraying system further comprises: a water collecting tray provided below the outdoor coil and communicated with the water tank.

11. The cooling pack of claim 1, wherein, At least one of the indoor coil and the outdoor coil comprises: a heat exchange pipe; a fin connected to the outside of the heat exchange pipe.

12. The cooling pack of claim 1, wherein, The cooling unit further comprises a refrigeration system, the refrigeration system comprising: a compressor, an outdoor heat exchanger and an indoor heat exchanger, the compressor, the outdoor heat exchanger and the indoor heat exchanger being connected to form a refrigeration loop, the compressor and the indoor heat exchanger being provided in the indoor space, and the outdoor heat exchanger being provided in the outdoor space.

13. The cooling pack of claim 12, wherein, The compressor is a plurality of compressors arranged in parallel. Or, the compressor is one, and the compressor is a magnetic suspension compressor.

14. The cooling unit of claim 12, wherein, In the air flow direction, the indoor coil and the indoor heat exchanger are arranged in sequence.

15. The cooling unit of claim 12, wherein, The outdoor space has an outdoor air inlet and an outdoor air outlet, and the cooling unit further comprises: an outdoor air fan for driving air flow from the outdoor air inlet to the outdoor air outlet.

16. The cooling pack of claim 15, wherein, The outdoor coil and the outdoor heat exchanger are arranged in sequence along the airflow direction, and the outdoor heat exchanger has a heat exchange flow path which is connected in series between the compressor and the indoor heat exchanger.

17. The cooling unit of claim 16, wherein, The indirect heat exchange system further comprises: a spraying system for spraying water to the outdoor coil and the outdoor heat exchanger simultaneously.

18. The cooling unit of claim 12, wherein, The indoor coil and the outdoor coil are connected in series to form a heat exchange loop, the outdoor heat exchanger has first and second heat exchange flow paths which exchange heat with each other, the first heat exchange flow path is connected in series between the compressor and the indoor heat exchanger, and the second heat exchange flow path is connected in parallel to the heat exchange flow path and located downstream of the indoor coil and upstream of the outdoor coil.

19. The cooling unit of claim 18, wherein, The flow directions of the first and second heat exchange flow paths are opposite.

20. The cooling unit of claim 15, wherein, The outdoor fans are arranged at intervals.

21. The cooling unit of claim 15, wherein, The outdoor fans are arranged at the outdoor air outlets.

22. The cooling pack of claim 1, wherein, The casing has a partition plate for dividing the space in the casing into the outdoor space and the indoor space arranged horizontally, the fresh air inlet is arranged on the partition plate, the indoor air inlet and the indoor air outlet are arranged on the casing, and the casing further has an outdoor air inlet and an outdoor air outlet which communicate with the outdoor space.

23. A control method of a cooling unit, characterized by, The cooling unit is the cooling unit according to any one of claims 1-22, and the control method comprises: obtaining an outdoor air dry-bulb temperature Td; determining that the outdoor air dry-bulb temperature Td is less than or equal to an outdoor air switching temperature To2, and controlling the cooling unit to operate in a dry mode, heat exchange is performed through the indoor coil and the outdoor coil, the indoor fan operates, the fresh air inlet is closed, the indoor air inlet is opened, and the indoor air outlet is opened.

24. The control method of the cooling pack according to claim 23, wherein The control method further comprises: determining that the outdoor air dry-bulb temperature Td is greater than the outdoor air switching temperature To2 and less than or equal to an outdoor air switching temperature To1, wherein To2 < To1; obtaining a supply air humidity Tw1 of the equipment to be cooled; determining that the supply air humidity Tw1 of the equipment to be cooled is greater than or equal to Twset-10% and less than or equal to Twset+10%, wherein Twset is a supply air set humidity of the equipment to be cooled; controlling the cooling unit to operate in a direct air mode, the indoor coil and the outdoor coil stop working, the indoor fan operates, the fresh air inlet is opened, the indoor air inlet is opened, and the indoor air outlet is opened.

25. The control method of the cooling pack according to claim 24, wherein The control method further comprises: determining that the supply air humidity Tw1 of the equipment to be cooled is less than Twset-10% or greater than Twset+10%; controlling the cooling unit to operate in the dry mode, heat exchange is performed through the indoor coil and the outdoor coil, the indoor fan operates, the fresh air inlet is closed, the indoor air inlet is opened, and the indoor air outlet is opened.

26. The control method of the cooling pack according to claim 24, wherein The indirect heat exchange system further comprises a spraying system for spraying water to the outdoor coil, and the control method further comprises: determining that the outdoor air dry-bulb temperature Td is greater than the outdoor air switching temperature To1; determining that an outdoor air wet-bulb temperature Tw is less than or equal to an outdoor air switching wet-bulb temperature Two; controlling the cooling unit to operate in a cooling mode, controlling the indoor coil and the outdoor coil to work, the spray system to be opened, the compressor to be operated, the fresh air inlet to be closed, the indoor fan to be operated, the indoor air inlet to be opened, and the indoor air outlet to be opened.

27. The control method of the cooling pack according to claim 26, wherein The cooling unit further comprises a refrigeration system, the refrigeration system comprising a compressor, an outdoor heat exchanger and an indoor heat exchanger, the compressor, the outdoor heat exchanger and the indoor heat exchanger being connected to form a refrigeration circuit, and the control method further comprises: determining that the outdoor inlet wet-bulb temperature Tw is greater than the outdoor inlet switching wet-bulb temperature Two; controlling the cooling unit to operate in a cooling mode, controlling the indoor coil and the outdoor coil to work, the spray system to be opened, the compressor to be operated, the fresh air inlet to be closed, the indoor fan to be operated, the indoor air inlet to be opened, and the indoor air outlet to be opened.

28. The control method of the cooling pack according to claim 26, wherein The cooling unit further comprises a refrigeration system, the refrigeration system comprising a compressor, an outdoor heat exchanger and an indoor heat exchanger, the compressor, the outdoor heat exchanger and the indoor heat exchanger being connected to form a refrigeration circuit, and the control method further comprises: determining that the outdoor inlet wet-bulb temperature Tw is greater than the outdoor inlet switching wet-bulb temperature Two; controlling the cooling unit to operate in a cooling mode, controlling the indoor coil and the outdoor coil to work, the spray system to be opened, the compressor to be operated, the fresh air inlet to be closed, the indoor fan to be operated, the indoor air inlet to be opened, and the indoor air outlet to be opened.

29. The control method of a cooling pack according to claim 27 or 28, characterized by, The control method further comprises: when the outdoor inlet wet-bulb temperature Tw is less than or equal to the supply air set temperature Tset of the device to be cooled, controlling the compressor to operate at a first frequency, wherein Tset>Two; when the outdoor inlet wet-bulb temperature Tw is greater than the supply air set temperature Tset of the device to be cooled, controlling the compressor to operate at a second frequency, the second frequency being greater than the first frequency.

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