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 an indirect heat exchange system and a wet film, the indirect heat exchange system comprises an indoor coil pipe, an outdoor coil pipe and a circulating water pump, the indoor coil pipe and the outdoor coil pipe are connected end to end to form a heat exchange loop, and the circulating water pump is arranged on the heat exchange loop; the heat exchanger is used for driving a heat exchange medium to circularly flow between the indoor coil and the outdoor coil; the wet film is arranged adjacent to the indoor coil pipe. According to the cooling unit, heat exchange between indoor air and the indoor coil pipe can be achieved through heat exchange between outdoor air and the outdoor coil pipe, and cooling of the indoor air is achieved. And the flow resistance to indoor air and outdoor air can be effectively reduced, so that the energy consumption of the cooling unit can be reduced, and the effects of saving energy and reducing consumption are achieved. And the wet film is arranged adjacent to the indoor coil pipe, so that the humidity of indoor air can be increased, the indoor environment can be humidified, meanwhile, the indoor air can be further cooled, and the temperature and humidity control function of the cooling unit can be 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] In existing technologies, cooling units utilize heat exchange cores to achieve heat exchange between outdoor and indoor air. However, the presence of these cores hinders the flow of air between the two environments, increasing the energy consumption of the cooling unit. During winter use, heat exchange cores are prone to condensation, water accumulation, freezing, and cracking, and are also susceptible to bacterial and scale growth, which can negatively impact heat exchange efficiency and thus the energy efficiency of the cooling unit. Furthermore, uncontrollable indoor humidity can lead to excessively dry indoor conditions, increasing the risk of static electricity-induced fires. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a cooling unit with low air resistance, which can not only cool indoor air, but also reduce the energy consumption of the cooling unit and achieve energy saving.

[0004] The present invention also proposes a control method for a cooling unit, wherein the cooling unit is the aforementioned cooling unit.

[0005] According to an embodiment of the present invention, a cooling unit includes: an indirect heat exchange system, the indirect heat exchange system including an indoor coil, an outdoor coil and a circulating water pump, the indoor coil and the outdoor coil being connected end to end to form a heat exchange loop, the circulating water pump being disposed on the heat exchange loop and used to drive the heat exchange medium to circulate between the indoor coil and the outdoor coil; and a wet film disposed adjacent to the indoor coil.

[0006] According to embodiments of the present invention, a cooling unit is provided by an indirect heat exchange system comprising an indoor coil, an outdoor coil, and a circulating water pump. The indoor and outdoor coils are connected end-to-end to form a heat exchange loop. The circulating water pump drives the heat exchange medium to circulate between the indoor and outdoor coils. This system can replace conventionally used heat exchange cores, enabling heat exchange between the indoor air and the indoor coils through outdoor air exchange with the outdoor coils, thus cooling the indoor air and consequently the equipment to be cooled. Furthermore, the indoor and outdoor coils effectively reduce the flow resistance to the indoor and outdoor air, thereby reducing the energy consumption of the cooling unit and achieving energy saving. The wet film is positioned adjacent to the indoor coils; when indoor humidity is low, opening the wet film increases the humidity of the indoor air flowing through the indoor coils, humidifying the indoor environment and further cooling the indoor air, thus enabling the cooling unit to control both temperature and humidity.

[0007] In some embodiments of the present invention, the indirect heat exchange system further includes a spray water supply system for supplying water to the wet film.

[0008] In some embodiments of the present invention, the spray water supply system includes: a water tank; and a spray water supply pump, wherein the spray water supply pump is used to drive water in the water tank to flow to the wet membrane.

[0009] In some embodiments of the present invention, the spray water supply system further includes: a water tank, the lower end of the wet membrane being located inside the water tank, and the spray water supply pump being used to drive water in the water tank to flow above the water tank or the wet membrane.

[0010] In some embodiments of the present invention, the water tank is connected to the water trough.

[0011] In some embodiments of the present invention, a filter is provided between the water tank and the water trough.

[0012] In some embodiments of the present invention, the spray water pump is also used to drive water in the water tank to spray onto the outdoor coil.

[0013] In some embodiments of the present invention, the sprinkler water supply system further includes: a sprinkler device connected to the water tank, the sprinkler device being used to spray water onto the outdoor coil, and the sprinkler water supply pump being used to drive the water in the water tank to flow to the sprinkler device.

[0014] 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.

[0015] 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.

[0016] In some embodiments of the present invention, the sprinkler water supply system further includes a water receiving tray, which is disposed below the outdoor coil and is connected to the water tank.

[0017] In some embodiments of the present invention, a filter is provided between the water receiving tray and the water tank.

[0018] In some embodiments of the present invention, a first valve is provided between the spraying device and the spraying water supply pump, and a second valve is provided between the spraying water supply pump and the wet film.

[0019] In some embodiments of the present invention, at least one of the indoor coil and the outdoor coil includes: a heat exchange tube connected to the heat exchange circuit; and fins connected to the outside of the heat exchange tube.

[0020] In some embodiments of the present invention, the cooling unit further includes: a housing having a spaced-apart indoor space and an outdoor space, the indoor space having an indoor air inlet and an indoor air outlet, the indoor coil and the wet film being located in the indoor space, and the outdoor coil being located in the outdoor space; and an indoor fan for driving airflow from the indoor air inlet to the indoor air outlet.

[0021] In some embodiments of the present invention, the indoor space has a fresh air inlet, and the indoor fan is also used to drive airflow from the fresh air inlet to the indoor air outlet.

[0022] 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.

[0023] 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.

[0024] In some embodiments of the present invention, the indoor fan is located at the indoor air outlet.

[0025] In some embodiments of the present invention, the indoor fans are multiple units arranged at intervals.

[0026] 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.

[0027] 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.

[0028] In some embodiments of the present invention, the indoor coil and the indoor heat exchanger are arranged sequentially along the airflow direction.

[0029] In some embodiments of the present invention, the outdoor space has an outdoor air inlet and an outdoor air outlet disposed on the housing, and the cooling unit further includes an outdoor fan for driving airflow from the outdoor air inlet to the outdoor air outlet.

[0030] 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.

[0031] In some embodiments of the present invention, the indirect heat exchange system further includes a spray water supply system, which is used to spray water simultaneously onto the outdoor coil and the outdoor heat exchanger.

[0032] In some embodiments of the present invention, the outdoor fans are multiple units arranged at intervals.

[0033] In some embodiments of the present invention, the outdoor fan is located at the outdoor air outlet.

[0034] 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 intake dry-bulb temperature Td; determining that the outdoor intake dry-bulb temperature Td is less than or equal to the outdoor intake switching temperature To2; controlling the cooling unit to operate in dry mode; controlling the circulating water pump to start; and stopping the wet film from working.

[0035] According to the control method of the cooling unit of the present invention, when the outdoor inlet dry-bulb temperature Td is less than or equal to the outdoor inlet switching temperature To2, the circulating water pump is started to control the cooling unit to operate in dry mode. An indirect heat exchange system replaces the conventionally used heat exchange core, enabling heat exchange between the indoor air and the indoor coil through the heat exchange between the outdoor air and the outdoor coil, thus achieving cooling of the indoor air and consequently cooling of the equipment to be cooled. This reduces power consumption and operating costs. The indoor and outdoor coils also effectively reduce the flow resistance to the indoor and outdoor air, thereby reducing the energy consumption of the cooling unit and achieving energy efficiency optimization and energy saving. Furthermore, with the same heat exchange area, the overall size of the indoor and outdoor coils is smaller than that of the heat exchange core, saving space and facilitating the optimization of the cooling unit's structural layout.

[0036] In some embodiments of the present invention, the cooling unit further includes a housing and an indoor fan. The housing has a spaced-apart indoor space and an outdoor space. The indoor space has a fresh air inlet, an indoor air inlet, and an indoor air outlet. The indoor coil and the wet film are located in the indoor space, and the outdoor coil is located in the outdoor space. The indoor fan is used to drive airflow from the indoor air inlet and the fresh air inlet to the indoor air outlet. The control method further includes: determining that 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, 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 set humidity of the supply air of the equipment to be cooled; controlling the cooling unit to operate in direct ventilation mode, controlling the circulating water pump to be turned off, the fresh air inlet to be turned on, the indoor air inlet to be turned on, the indoor air outlet to be turned on, and the indoor fan to be turned on.

[0037] 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; controlling the circulating water pump to start; and stopping the wet film from working.

[0038] In some embodiments of the present invention, the indirect heat exchange system further includes a spray water supply system for supplying water to the wet film. The control method further includes: determining that the outdoor inlet dry-bulb temperature Td is greater than the outdoor inlet switching temperature To1; obtaining the outdoor inlet wet-bulb temperature Tw; determining that the outdoor inlet wet-bulb temperature Tw is greater than or equal to the outdoor inlet switching wet-bulb temperature Two2 and less than the outdoor inlet switching wet-bulb temperature Two1, wherein Two1>Two2; controlling the cooling unit to operate in evaporative cooling mode, controlling the circulating water pump to shut down, controlling the spray water supply system to supply water to the wet film, opening the fresh air inlet, opening the indoor air inlet, opening the indoor air outlet, and operating the indoor fan.

[0039] In some embodiments of the present invention, the spray water supply system is also used to spray water onto the outdoor coil, and the control method further includes: determining that the outdoor inlet wet-bulb temperature Tw is less than the outdoor inlet switching wet-bulb temperature Two2; controlling the cooling unit to operate in spray mode, controlling the fresh air inlet to close, the indoor air inlet to open, the indoor air outlet to open, and the circulating water pump to open, and the spray water supply system sprays water onto the outdoor coil and stops supplying water to the wet film.

[0040] 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 Two1; controlling the cooling unit to operate in a mixed mode, controlling the circulating water pump to start, the spray water supply system to supply water to the wet film and stop spraying water to the outdoor coil, the indoor fan to run, the indoor air outlet to open, the indoor air inlet to open, the fresh air inlet to close, and the compressor to run.

[0041] 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 > Tw; 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.

[0042] 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

[0043] 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:

[0044] Figure 1 This is a schematic diagram of one embodiment of a cooling unit according to an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of another embodiment of the cooling unit according to an embodiment of the present invention;

[0046] Figure 3 This is a flowchart of a control method for a cooling unit according to an embodiment of the present invention.

[0047] Figure label:

[0048] 100. Cooling unit;

[0049] 1. Indirect heat exchange system; 11. Indoor coil; 12. Outdoor coil; 13. Circulating water pump; 14. Spray water supply system; 141. Water tank; 142. Spray device; 1421. Manifold; 1422. Nozzle; 143. Spray water supply pump; 144. Water tank; 145. First valve; 146. Second valve; 15. Wet film; 16. Filter;

[0050] 2. Refrigeration system; 21. Compressor; 22. Outdoor heat exchanger; 23. Indoor heat exchanger; 24. Indoor fan; 25. Throttling device;

[0051] 3. Outdoor fan; 4. Fresh air valve; 5. Return air valve; 61. Indoor space; 62. Outdoor space; 63. Indoor air inlet; 64. Indoor air outlet; 65. Outdoor air inlet; 66. Outdoor air outlet; 67. Fresh air inlet. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The cooling unit 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0056] like Figure 1 and Figure 2 As shown, the cooling unit 100 according to an embodiment of the present invention includes an indirect heat exchange system 1 and a wet film 15.

[0057] Specifically, the indirect heat exchange system 1 includes an indoor coil 11, an outdoor coil 12, and a circulating water pump 13. The indoor coil 11 and the outdoor coil 12 are connected end to end to form a heat exchange loop. 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.

[0058] The cooling unit 100 can be used in data centers. By utilizing dry air energy for cooling, it can achieve high-efficiency cooling of the data center. It can be understood that the indoor air exchanges heat with the indoor coil 11 and is then used to cool the data center.

[0059] In the indirect heat exchange system 1, the outdoor coil 12 is used to exchange heat with the outdoor air, the indoor coil 11 is used to exchange heat with the indoor air, and the circulating water pump 13 can increase the driving force for the flow of the heat exchange medium, so that the heat exchange medium continuously circulates in the heat exchange loop formed by the indoor coil 11 and the outdoor coil 12.

[0060] In the specific heat exchange process of the indirect heat exchange system 1, outdoor air flows through the outdoor coil 12, exchanging heat with the heat exchange medium inside the outdoor coil 12. 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, exchanging 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 inside 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. The indoor air is then sent back into the room, thereby achieving the cooling effect on the equipment to be cooled, such as the data center.

[0061] Compared to traditional mechanical refrigeration using compressors, 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, thus achieving energy efficiency optimization and energy conservation.

[0062] The wet film 15 is installed near the indoor coil 11. When the indoor humidity is low, the indoor humidity can be increased by opening the wet film 15, thereby humidifying the indoor environment and realizing the temperature and humidity control function of the cooling unit 100.

[0063] Meanwhile, when the indoor air flows through the wet membrane 15, the water on the wet membrane 15 absorbs heat and evaporates, which can cool the indoor air to a certain extent. Combined with the indirect heat exchange system 1, it can achieve secondary cooling of the indoor air and enhance the cooling effect of the indoor air.

[0064] Optionally, the indoor air can flow through the wet membrane 15 first and then to the indoor coil 11, or it can flow through the indoor coil 11 first and then to the wet membrane 15. There is no restriction here.

[0065] In existing technology, the cooling unit 100 utilizes a heat exchange core to achieve heat exchange between outdoor and indoor air. However, the presence of the heat exchange core hinders the flow of outdoor and indoor air, increasing the energy consumption of the cooling unit 100. During winter use, the heat exchange core is prone to condensation, water accumulation, freezing, and cracking, and is also highly susceptible to bacterial and scale growth, which can affect its heat exchange efficiency and thus the energy efficiency of the cooling unit 100. Furthermore, uncontrollable indoor humidity can lead to excessively dry indoor conditions, posing a risk of static electricity-induced fires.

[0066] In this application, the indirect heat exchange system 1 described above replaces the conventional heat exchange core, enabling heat exchange between outdoor and indoor air to ensure effective cooling of the indoor air. The indoor coil 11 and outdoor coil 12 effectively reduce the flow resistance to both indoor and outdoor air, thereby reducing the energy consumption of the cooling unit 100 and achieving energy savings. Furthermore, the wet film 15 increases the humidity of the indoor air flowing through the indoor coil 11, thus humidifying the indoor environment.

[0067] 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.

[0068] 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.

[0069] According to an embodiment of the present invention, the cooling unit 100, by setting up an indirect heat exchange system 1 having an indoor coil 11, an outdoor coil 12, and a circulating water pump 13, wherein the indoor coil 11 and the outdoor coil 12 are connected end to end to form a heat exchange loop, and the circulating water pump 13 is used to drive the heat exchange medium to circulate between the indoor coil 11 and the outdoor coil 12, can replace the conventionally used heat exchange core. This not only utilizes the heat exchange between the outdoor air and the outdoor coil 12 to achieve heat exchange between the indoor air and the indoor coil 11, thus cooling the indoor air and consequently cooling the equipment to be cooled, but also effectively reduces the flow resistance of the indoor and outdoor air, thereby reducing the energy consumption of the cooling unit 100 and achieving energy saving and consumption reduction. Furthermore, the wet film 15 is installed adjacent to the indoor coil 11. When the indoor humidity is low, opening the wet film 15 can increase the humidity of the indoor air flowing through the indoor coil 11, thereby humidifying the indoor environment. At the same time, it can further cool the indoor air, thus realizing the temperature and humidity control function of the cooling unit 100.

[0070] 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 water supply system 14, which supplies water to the wet film 15 so that the wet film 15 can remain moist for a long time. The wet film 15 can work continuously, increasing the humidity of the indoor air flowing through the indoor coil 11, thereby achieving continuous humidification of the indoor environment and further realizing humidity control of the indoor environment.

[0071] Furthermore, such as Figure 1 and Figure 2 As shown, the sprinkler water supply system 14 includes a water tank 141 and a sprinkler water supply pump 143. The sprinkler water supply pump 143 drives the water in the water tank 141 to flow to the wet membrane 15. The water tank 141 serves to store and supply water. The sprinkler water supply pump 143 can pump the water in the water tank 141 to the wet membrane 15, continuously supplying water to the wet membrane 15, so that the wet membrane 15 can maintain a moist state for a long time. The wet membrane 15 can work continuously, increasing the humidity of the indoor air flowing through the indoor coil 11, realizing continuous humidification of the indoor environment, and better achieving humidity control of the indoor environment.

[0072] Furthermore, such as Figure 1 and Figure 2 As shown, the sprinkler water supply system 14 also includes a water tank 144, with the lower end of the wet membrane 15 located inside the water tank 144. The sprinkler water supply pump 143 drives the water in the water tank 141 to flow towards the water tank 144 or above the wet membrane 15. It can be understood that the sprinkler water supply pump 143 drives the water in the water tank 141 to flow towards the water tank 144, where the water soaks the wet membrane 15, increasing the indoor humidity after the wet membrane 15 leaks water.

[0073] Alternatively, the spray water supply pump 143 can be used to drive the water in the water tank 141 to flow upwards towards the wet membrane 15. The spray water supply pump 143 can pump the water in the water tank 141 to the top of the wet membrane 15. In this way, water can spray onto the wet membrane 15 from the top. Thus, spray humidification of the wet membrane 15 can be achieved. The water flow can flow from top to bottom onto the wet membrane 15, thereby wetting the wet membrane 15 from top to bottom. This spray humidification of the wet membrane 15 is beneficial to increasing the wetting speed of the wet membrane 15, and to achieving overall wetting of the wet membrane 15, thus maximizing the humidification capacity of the wet membrane 15.

[0074] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the water tank 144 is connected to the water reservoir 141. The remaining water after spraying the wet membrane 15 can flow into the water tank 144, which can collect excess water from the wet membrane 15. The water in the water tank 144 can flow back into the water reservoir 141 to further participate in the humidification cycle. Therefore, circulating water can be used to humidify the wet membrane 15, which helps reduce bacterial growth in the water reservoir 141 and improves the hygiene level of the cooling unit 100. At the same time, it not only prevents water on the wet membrane 15 from flowing into the room and polluting the environment, but also saves water and reduces the water consumption of the cooling unit 100.

[0075] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a filter 16 is provided between the water tank 144 and the water tank 141. It can filter the water flowing from the water tank 144 to the water tank 141, keep the water in the water tank 141 clean and free of impurities, further filter the water flowing in the spray water supply system 14, purify the water flowing between the water tank 144 and the water tank 141, prevent the water on the wet membrane 15 from being contaminated, and prevent the airflow flowing into the room from being contaminated.

[0076] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the spray water pump 143 is also used to drive the water in the water tank 141 to spray the outdoor coil 12, which can keep the surface of the outdoor coil 12 moist. The spray 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 indirectly exchanges heat 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, thereby improving the cooling effect of the indoor air on the equipment to be cooled, such as the data center.

[0077] Compared to the outdoor coil 12 which only exchanges heat with the outdoor air, by driving the water in the water tank 141 to spray water onto the outdoor coil 12, the heat transfer performance of the outdoor coil 12 can be enhanced, the cooling efficiency of the heat exchange medium at the outdoor coil 12 can be improved, thereby improving the cooling effect and cooling efficiency of the indirect heat exchange system 1.

[0078] Compared to traditional mechanical refrigeration using compressors, the indirect heat exchange system 1 with a spray water supply 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.

[0079] Furthermore, such as Figure 1 and Figure 2 As shown, the spray water supply 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 water supply system 14. It can achieve the optimal spraying effect with a smaller volume of water, thereby saving spray water.

[0080] Furthermore, such as Figure 1 and Figure 2 As shown, the spray water supply system 14 also includes a spray device 142, which is connected to a water tank 141. The spray device 142 is used to spray water onto the outdoor coil 12, and the spray water supply pump 143 is used to drive the water in the water tank 141 to flow to the spray device 142. The water tank 141 serves to store and supply water. The water tank 141 is used to store the cooling water required by the spray device 142 and supply water to the spray device 142. The spray device 142 is connected to the water tank 141, and the spray water supply pump 143 can increase the driving force for the water flow, pressurize the water in the water tank 141 and deliver it to the spray device 142, and then spray it onto the surface of the outdoor coil 12. This ensures sufficient spray volume and spray range, thereby achieving a stable and efficient cooling effect.

[0081] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the spray device 142 includes a manifold 1421, which extends along the length of the outdoor coil 12 and is connected at one end to a water tank 141. The manifold 1421 has multiple spray holes, which are positioned towards the outdoor coil 12 and spaced apart along the length of the manifold 1421. A spray water pump 143 pumps water from the water tank 141 into the manifold 1421, and then sprays it onto the surface of the outdoor coil 12 from the multiple spray holes. The multiple spray holes spaced apart along the length of the manifold 1421 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.

[0082] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the spray device 142 also includes multiple nozzles 1422, which are respectively disposed at multiple spray holes. The nozzles 1422 atomize water into fine droplets. Compared to simply having spray holes, the surface area of ​​the atomized water droplets is significantly increased, which accelerates the evaporation and heat absorption process, thereby improving cooling efficiency. The atomized water sprayed from the nozzles 1422 helps to evenly cover the outer surface of the outdoor coil 12, preventing uneven wetting caused by concentrated water flow, thus ensuring the consistency of evaporative cooling effect throughout the outdoor coil 12, and further improving the overall heat exchange efficiency of the outdoor coil 12.

[0083] In some embodiments of the present invention, the sprinkler water supply system 14 further includes a water receiving tray, which is located below the outdoor coil 12 and is connected to the water tank 141. The sprinkler water supply 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 is used to collect excess sprinkler water that has not evaporated, and then stores it in the water tank 141 for subsequent water supply. This achieves a closed loop, which can recycle water resources, thereby reducing water waste and ensuring the continuous operation of the sprinkler water supply system 14.

[0084] In some embodiments of the present invention, a filter is provided between the water receiving tray and the water tank 141 to filter the water flowing from the water receiving tray to the water tank 141, keeping the water in the water tank 141 clean, hygienic and free of impurities, further filtering the water flowing in the spray water supply system 14, purifying the water flowing between the water receiving tray and the water tank 141, preventing the water sprayed onto the outdoor coil 12 from being contaminated, and preventing the outdoor air flowing into the cooling unit 100 from being contaminated.

[0085] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a first valve 145 is provided between the spray device 142 and the spray water supply pump 143, and a second valve 146 is provided between the spray water supply pump 143 and the wet film 15. The opening or closing of the first valve 145 can control the flow of water between the spray device 142 and the spray water supply pump 143, and the opening or closing of the second valve 146 can control the flow of water between the wet film 15 and the spray water supply pump 143, thus facilitating the control of the cooling unit 100.

[0086] 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. The heat exchange tube is connected to a heat exchange circuit, and the fins are connected to the outside of the heat exchange tube. The heat exchange medium flows inside the heat exchange tube. 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 indoor coil 11 and the outdoor coil 12 are copper tube finned dry cooling coils, that is, the heat exchange tube is a copper tube.

[0087] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the cooling unit 100 also includes a housing and an indoor fan 24. The housing has a spaced-apart indoor space 61 and an outdoor space 62. The indoor space 61 has an indoor air inlet 63 and an indoor air outlet 64. The indoor coil 11 and the wet film 15 are located in the indoor space 61, and the outdoor coil 12 is located in the outdoor space 62. The indoor fan 24 is used to drive the airflow from the indoor air inlet 63 to the indoor air outlet 64.

[0088] Specifically, when the cooling unit 100 is running in dry mode, in the outdoor space 62, the outdoor air flows through the outdoor coil 12 and exchanges heat with the outdoor coil 12. The temperature of the heat exchange medium decreases and flows into the indoor coil 11. The indoor air enters the indoor space 61 from the indoor air inlet 63. In the indoor space 61, the indoor air flows through the indoor coil 11 and the wet film 15 for heat exchange and humidification. The cooled indoor air is driven by the indoor fan 24 and flows from the indoor air outlet 64 to the equipment to be cooled, thereby achieving the cooling effect of the cooling unit 100.

[0089] The indoor fan 24 can ensure the operation of the indirect heat exchange system 1 and the refrigeration system 2, thereby ensuring the stable operation and cooling effect of the cooling unit 100.

[0090] The indoor coil 11 and the indoor heat exchanger 23 are located between the indoor air inlet 63 and the indoor air outlet 64. 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 64. 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 64, thus ensuring the cooling effect.

[0091] In some embodiments of the present invention, such as 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. The indoor heat exchanger 23 is located near the indoor coil 11, and the outdoor heat exchanger 22 can be located near the outdoor coil 12.

[0092] 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.

[0093] Furthermore, such as Figure 1 As shown, 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.

[0094] 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.

[0095] 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.

[0096] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the indoor space 61 has a fresh air inlet 67, and the indoor fan 24 is also used to drive the airflow from the fresh air inlet 67 to the indoor air outlet 64.

[0097] 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 67 opens, the indoor air inlet 63 opens, and the indoor air outlet 64 opens. Outdoor fresh air enters the indoor space 61 directly through the fresh air inlet 67. The cooler outdoor air entering through the fresh air inlet 67 mixes with the indoor air entering through the indoor air inlet 63 and flows through the indoor air outlet 64 to the equipment to be cooled. This achieves direct cooling of the indoor air through the outdoor fresh air, thereby cooling the equipment to be cooled by the cooling unit 100. The wet film 15 can be opened as needed to directly cool the indoor air through the outdoor air, thus achieving the cooling effect of the cooling unit 100.

[0098] Furthermore, such as Figure 1 and Figure 2 As shown, a fresh air valve 4 can be installed at the fresh air inlet 67. The ratio of the air volume entering the indoor space 61 from the fresh air inlet 67 to the air volume entering the indoor space 61 from the indoor air inlet 63 can be controlled by adjusting the opening of the fresh air valve 4 according to the outdoor temperature and the operating temperature requirements of the equipment to be cooled, so that the cooling unit 100 can meet the different cooling needs of the equipment to be cooled.

[0099] Furthermore, when the indoor coil 11 is working, 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 refrigeration unit to improve the adaptability, energy efficiency and reliability of the cooling unit 100.

[0100] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a fresh air valve 4 is installed at the fresh air inlet 67 to open or close the fresh air inlet 67.

[0101] Therefore, when the cooling unit 100 operates in direct ventilation mode, the fresh air inlet 67 is opened via the fresh air valve 4, allowing outdoor air to directly enter the indoor space 61 through the fresh air inlet 67, thereby achieving cooling of the cooling unit 100. When the cooling unit 100 operates in dry mode, the fresh air inlet 67 is closed via the fresh air valve 4, preventing outdoor air from directly entering the indoor space 61 through the fresh air inlet 67, thus allowing the cooling unit 100 to achieve cooling through the indirect heat exchange system 1. Simultaneously, when the cooling unit 100 operates in direct ventilation mode, the opening degree of the fresh air valve 4 is controlled to regulate the airflow of outdoor air entering the indoor space 61 from the fresh air inlet 67, ensuring that the cooling unit 100 meets the different cooling requirements of the equipment being cooled.

[0102] 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 63, which is used to open or close the indoor air inlet 63.

[0103] Therefore, during the cooling process of the cooling unit 100, the indoor air inlet 63 is opened through the return air valve 5, allowing indoor air to enter the indoor space 61 from the indoor air inlet 63 and flow to the equipment to be cooled from the indoor air outlet 64 after passing through the indoor coil 11 or mixing with outdoor fresh air, 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 regulate the airflow entering the indoor space 61 from the indoor air inlet 63, ensuring that the cooling unit 100 meets the different cooling requirements of the equipment to be cooled.

[0104] In some embodiments of the present invention, the housing has a partition for dividing the space inside the housing into an outdoor space 62 and an indoor space 61 arranged in a horizontal direction. A fresh air inlet 67 is provided on the partition, and an indoor air inlet 63 and an indoor air outlet 64 are provided on the housing.

[0105] When the cooling unit 100 operates in dry mode, outdoor air enters the outdoor space 62. Within the outdoor space 62, the outdoor air flows through the outdoor coil 12 to cool the heat exchange medium and through the outdoor heat exchanger 22 to cool the refrigerant. Then, the outdoor air flows out of the outdoor outlet 66 to the outdoor environment. Indoor air enters the indoor space 61 through the indoor inlet 63. Within the indoor space 61, the indoor air flows through the indoor coil 11 and the indoor heat exchanger 23, undergoing multi-stage cooling, before flowing out of the indoor outlet 64 to the equipment to be cooled. This achieves the cooling effect of the cooling unit 100.

[0106] When the cooling unit 100 is running in direct ventilation mode, outdoor air enters the outdoor space 62 and enters the indoor space 61 directly through the fresh air inlet 67. The cooler outdoor air mixes with the indoor air entering the indoor space 61 from the indoor air inlet 63 and flows from the indoor air outlet 64 to the equipment to be cooled. Thus, the outdoor air directly cools and lowers the temperature of the indoor air, thereby achieving the cooling effect of the cooling unit 100.

[0107] In some embodiments of the present invention, such as Figure 1 and Figure 2As shown, the outdoor space 62 has an outdoor air inlet 65 and an outdoor air outlet 66 disposed on the casing. The cooling unit 100 also includes an outdoor fan 3, which drives the airflow from the outdoor air inlet 65 to the outdoor air outlet 66. Thus, the outdoor fan 3 provides 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 to ensure the operation of the indirect heat exchange system 1 and the refrigeration system 2, thereby ensuring the stable operation and cooling effect of the cooling unit 100.

[0108] 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.

[0109] 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 66 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.

[0110] Furthermore, the outdoor coil 12 is arranged in multiple groups at intervals, and each group of outdoor coil 12 includes a first coil and a second coil. There are multiple outdoor air outlets 66, and each group of outdoor coil 12 is arranged opposite to at least one outdoor air outlet 66.

[0111] 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 64, used to drive airflow from the indoor air inlet 63 to the indoor air outlet 64. The indoor fan 24 provides power for the airflow, driving the airflow to the indoor coil 11 and the indoor heat exchanger 23 for heat exchange. The airflow, having completed heat exchange with the indoor coil 11 and the heat exchanger 23, is then blown onto the equipment to be cooled, thus achieving cooling. When the indoor coil 11 and the indoor heat exchanger 23 operate simultaneously, the airflow passes through both the indoor coil 11 and the heat exchanger 23 to achieve two-stage heat exchange, and then, driven by the indoor fan 24, flows towards the equipment to be cooled, improving the cooling effect.

[0112] In this application, an indirect heat exchange system 1 is used to replace the conventional heat exchange core to achieve heat exchange between outdoor air and indoor air. The indoor coil 11 and the outdoor coil 12 can effectively reduce the flow resistance to indoor and outdoor air, thereby reducing the energy consumption of the indoor fan 24 and improving the energy efficiency of the cooling unit 100 to achieve the purpose of energy saving.

[0113] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the outdoor fan 3 is located at the outdoor air outlet 66. The outdoor fan 3 provides power for airflow, forcibly drawing outdoor air from the outdoor air inlet 65 into the outdoor space 62. After flowing through the outdoor coil 12 and the outdoor heat exchanger 22, it flows out of the outdoor air outlet 66 to the outdoor environment, thereby reducing the surface temperature of the outdoor coil 12 and / or the outdoor heat exchanger 22, thus cooling the heat exchange medium and / or refrigerant. The outdoor fan 3 ensures the operation of the indirect heat exchange system 1 and the refrigeration system 2, thereby ensuring the stable operation and cooling effect of the cooling unit 100.

[0114] In this application, an indirect heat exchange system 1 is used to replace the conventional heat exchange core to achieve heat exchange between outdoor air and indoor air. The indoor coil 11 and the outdoor coil 12 can effectively reduce the flow resistance to indoor and outdoor air, thereby reducing the energy consumption of the outdoor fan 3 and improving the energy efficiency of the cooling unit 100 to achieve the purpose of energy saving.

[0115] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, multiple indoor fans 24 are spaced apart. Therefore, by operating multiple outdoor fans 3 simultaneously, the uniformity of airflow can be enhanced. The spaced arrangement of multiple outdoor fans 3 can cover a larger space, thereby expanding the range of airflow and improving the heat exchange efficiency of the indoor air within the indoor space 61. Furthermore, when one outdoor fan 3 fails, the remaining outdoor fans 3 can continue to operate, avoiding the shutdown of the indirect heat exchange system 1 and the refrigeration system 2, thus 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 2As 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.

[0117] In some embodiments of the present invention, multiple compressors 21 are connected in parallel. Each compressor 21 compresses the refrigerant into a high-temperature, high-pressure gas. 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.

[0118] 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.

[0119] The compressors 21 can be arranged in parallel in two, three, four or five, etc. This application does not specify the specific number of compressors 21, and the compressors 21 can be traditional rotary compressors 21.

[0120] In another embodiment of the present invention, there is 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.

[0121] 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.

[0122] In some embodiments of the present invention, the indoor coil 11 and the indoor heat exchanger 23 are arranged sequentially along the airflow direction, so that the airflow first flows 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 the indoor heat exchanger 23, thereby improving the cooling efficiency of the cooling unit 100. Simultaneously, it allows for a compact structure of the cooling unit 100, saving space.

[0123] At the same time, when the wet film 15 is turned on, the airflow can first flow through the wet film 15 for pre-cooling, further improving the cooling efficiency of the cooling unit 100.

[0124] In some embodiments of the present invention, as shown in the figures, the outdoor fan 3 drives airflow toward the outdoor coil 12 and the outdoor heat exchanger 22. Along the airflow direction, the outdoor coil 12 and the outdoor heat exchanger 22 are arranged sequentially, so that the airflow first passes through the outdoor coil 12 to cool the heat exchange medium, and then passes 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, thereby improving the cooling efficiency of the cooling unit 100. Simultaneously, it allows for a compact structure of the cooling unit 100, saving space.

[0125] 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.

[0126] In some embodiments of the present invention, such as Figure 2 As shown, the indirect heat exchange system 1 also includes a spray water supply system 14, which sprays water onto the outdoor coil 12 and the outdoor heat exchanger 22 simultaneously. The spray water supply system 14 keeps the surfaces of the outdoor coil 12 and the outdoor heat exchanger 22 moist. The sprayed water evaporates and absorbs heat on the surfaces of the outdoor coil 12 and the outdoor heat exchanger 22, which can effectively reduce the temperature of the heat exchange medium in the outdoor coil 12 and the temperature of the refrigerant in the outdoor heat exchanger 22.

[0127] After cooling, the heat exchange medium enters the indoor coil 11 and exchanges heat with the indoor air. This relatively increases the temperature difference between the heat exchange medium in the indoor coil 11 and the indoor air, improving the heat exchange effect between the indoor coil 11 and the indoor air. This allows for better primary cooling of the indoor air. After the refrigerant condenses in the outdoor heat exchanger 22, it enters the indoor heat exchanger 23 to evaporate and absorb heat, thus cooling the space where the indoor heat exchanger 23 is located. This achieves secondary cooling of the indoor air, thereby improving the cooling effect of the cooling unit 100 and further enhancing the cooling effect of the indoor air on equipment to be cooled, such as data centers.

[0128] Compared to the previous method where only outdoor airflow passes through the outdoor coil 12 and the outdoor heat exchanger 22 for heat exchange, the installation of the spray water supply system 14 can enhance the heat transfer performance of the outdoor coil 12 and the outdoor heat exchanger 22, improve the cooling efficiency of the heat exchange medium at the outdoor coil 12, and improve the condensation efficiency of the refrigerant at the outdoor heat exchanger 22. This can improve the cooling effect and cooling efficiency of the cooling unit 100, thereby achieving the goal of energy saving and consumption reduction.

[0129] 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.

[0130] like Figure 3 As shown, the control method of the cooling unit 100 according to an embodiment of the present invention includes:

[0131] Obtain the outdoor intake dry bulb temperature Td;

[0132] If 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, control the circulating water pump 13 to start, and control the wet film 15 to stop working.

[0133] Specifically, the cooling unit 100 may be 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 To, and controls the operating mode of the cooling unit 100 based on the determination.

[0134] It should be noted that the outdoor intake dry bulb temperature Td is the dry bulb temperature of the outdoor air flowing to the outdoor coil 12, and the outdoor intake switching temperature To2 is the preset temperature.

[0135] 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 intake dry bulb temperature Td is less than or equal to the outdoor intake switching temperature To2, the processor sends a signal to the controller, causing the controller to control the circulating water pump 13 to start, thereby controlling the cooling unit 100 to operate in dry mode.

[0136] In the indirect heat exchange system 1, the outdoor coil 12 is used to exchange heat with the outdoor air, the indoor coil 11 is used to exchange heat with the indoor air, and the circulating water pump 13 can increase the driving force for the flow of the heat exchange medium, so that the heat exchange medium continuously circulates in the heat exchange loop formed by the indoor coil 11 and the outdoor coil 12.

[0137] When 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 use the low temperature outdoor air to achieve cooling, thereby reducing power consumption and operating costs, and achieving the purpose of energy efficiency optimization and energy saving.

[0138] At this time, the outdoor air can fully cool the heat exchange medium in the outdoor coil 12, without needing to open the wet film 15 to cool the indoor air a second time.

[0139] In the specific heat exchange process of the cooling unit 100, outdoor air flows through the outdoor coil 12, exchanging heat with it. The temperature of the heat exchange medium decreases, and it flows into the indoor coil 11 driven by the circulating water pump 13. Indoor air flows through the indoor coil 11, exchanging heat with it. The indoor air temperature decreases, facilitating cooling of the equipment to be cooled. The temperature of the heat exchange medium increases, and it flows into the outdoor coil 12 driven by the circulating water pump 13, thus creating a cycle. Therefore, the indoor air can be cooled through the indirect heat exchange system 1, achieving the cooling effect for equipment such as data centers.

[0140] This application replaces the conventional heat exchange core with an indirect heat exchange system 1, 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.

[0141] 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.

[0142] According to the control method of the cooling unit 100 of the present invention, when the outdoor inlet dry-bulb temperature Td is less than or equal to the outdoor inlet switching temperature To2, the circulating water pump 13 is started to control the cooling unit 100 to operate in dry mode. The indirect heat exchange system 1 replaces the conventionally used heat exchange core, and can realize the heat exchange between the indoor air and the indoor coil 11 by utilizing the heat exchange between the outdoor air and the outdoor coil 12, thereby achieving the cooling and temperature reduction of the indoor air and the equipment to be cooled. This can reduce power consumption and operating costs. The indoor coil 11 and the outdoor coil 12 can also effectively reduce the flow resistance to the indoor and outdoor air, thereby reducing the energy consumption of the cooling unit 100 and achieving the purpose of energy efficiency optimization and energy saving. In addition, with the same heat exchange area, the overall size of the indoor coil 11 and the outdoor coil 12 is smaller than that of the heat exchange core, which can save space and is conducive to optimizing the structural layout of the cooling unit 100.

[0143] In some embodiments of the present invention, such as Figure 3 As shown, the cooling unit 100 also includes a casing and an indoor fan 24. The casing has a spaced-apart indoor space 61 and an outdoor space 62. The indoor space 61 has a fresh air inlet 67, an indoor air inlet 63, and an indoor air outlet 64. The indoor coil 11 and the wet film 15 are located in the indoor space 61, and the outdoor coil 12 is located in the outdoor space 62. The indoor fan 24 is used to drive airflow from the indoor air inlet 63 and the fresh air inlet 67 to the indoor air outlet 64. The control method also includes:

[0144] 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; 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 humidity setting of the equipment to be cooled.

[0145] 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 fresh air can be directly introduced to achieve the cooling effect of the cooling unit 100.

[0146] Control the cooling unit 100 to operate in direct ventilation mode, control the circulating water pump 13 to be closed, control the fresh air inlet 67 to be opened, control the indoor air inlet 63 to be opened, control the indoor air outlet 64 to be opened, and control the indoor fan 24 to be running.

[0147] 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 indoor air can be cooled directly by outdoor fresh air, thereby achieving the cooling effect of the cooling unit 100.

[0148] Specifically, the circulating water pump 13 is turned off, the indoor fan 24 is running, the fresh air inlet 67 is open, the indoor air inlet 63 is open, and the indoor air outlet 64 is open. Outdoor fresh air enters the outdoor space 62 and directly enters the indoor space 61 through the fresh air inlet 67. The cooler outdoor fresh air mixes with the indoor air entering the indoor space 61 through the indoor air inlet 63 and flows through the indoor air outlet 64 to the equipment to be cooled. This directly cools the indoor air, achieving the cooling effect of the cooling unit 100. Simultaneously, because the circulating water pump 13 is turned off in direct ventilation mode, the overall energy consumption of the cooling unit 100 is reduced while maintaining the temperature and humidity of the equipment to be cooled, achieving energy savings.

[0149] In some embodiments, such as Figure 1 and Figure 2 As shown, the outdoor space 62 has an outdoor air inlet 65 and an outdoor air outlet 66, and the cooling unit 100 also includes an outdoor fan 3. The outdoor fan 3 drives the airflow from the outdoor air inlet 65 to the outdoor air outlet 66. Therefore, when the cooling unit 100 is operated in direct ventilation mode, the outdoor fan 3 stops, allowing the outdoor fresh air entering the outdoor space 62 from the outdoor air inlet 65 to enter the indoor space 61 via the fresh air inlet 67.

[0150] It should be noted that the outdoor air intake switching temperature To1 is a preset temperature.

[0151] In some embodiments of the present invention, such as Figure 3 As shown, the control method also includes:

[0152] 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 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 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 fresh air cannot be directly introduced to achieve the cooling effect of the cooling unit 100.

[0153] The cooling unit 100 is controlled to operate in dry mode, the circulating water pump 13 is started, and the wet film 15 stops working. Therefore, when the outdoor inlet dry-bulb temperature Td is determined to be greater than the outdoor inlet switching temperature To2 and less than or equal to the outdoor inlet 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. Heat exchange occurs through the indoor coil 11 and the outdoor coil 12, and the indoor air is cooled and reduced through the indirect heat exchange system 1, thereby achieving the cooling effect of the cooling unit 100.

[0154] Specifically, in the outdoor space 62, fresh outdoor air flows through the outdoor coil 12 to cool the heat exchange medium inside the outdoor coil 12. The temperature of the heat exchange medium decreases, and it flows into the indoor coil 11. Indoor air enters the indoor space 61 through the indoor air inlet 63. In the indoor space 61, the indoor air flows through the indoor coil 11 and is cooled before flowing from the indoor air outlet 64 to the equipment to be cooled. This achieves cooling of the indoor air through the indirect heat exchange system 1, thereby achieving the cooling effect of the cooling unit 100. Simultaneously, if the humidity of the supply air to the equipment to be cooled exceeds the acceptable range, the wet film 15 needs to be closed to prevent excessive humidity in the equipment, thus avoiding oxidation and corrosion of the internal parts of the equipment caused by excessive humidity.

[0155] 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.

[0156] In some embodiments of the present invention, such as Figure 3 As shown, the indirect heat exchange system 1 also includes a spray water supply system 14, which is used to supply water to the wet film 15. The control method further includes:

[0157] It is determined that the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To1. It can be understood that by determining that the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To1, it means that the outdoor temperature is high. At this time, the cooling unit 100 cannot meet the cooling effect of the equipment to be cooled by operating in dry mode or direct ventilation mode.

[0158] Obtain the outdoor intake wet-bulb temperature Tw; determine that the outdoor intake wet-bulb temperature Tw is greater than or equal to the outdoor intake switching wet-bulb temperature Two2 and less than the outdoor intake switching wet-bulb temperature Two1, where Two1>Two2; it can be understood that the spray water supply system 14 supplies water to the wet film 15 to achieve humidification and secondary cooling of the indoor air, realizing two-stage cooling of the indoor air. Therefore, if the outdoor intake wet-bulb temperature Tw is determined to be greater than or equal to the outdoor intake switching wet-bulb temperature Two2 and less than the outdoor intake switching wet-bulb temperature Two1, the humidification and secondary subcooling effect of the wet film 15 is good, and the spray water supply system 14 can be turned on to supply water to the wet film 15 to improve the cooling effect of the cooling unit 100.

[0159] 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.

[0160] The cooling unit 100 is controlled to operate in evaporative cooling mode, the circulating water pump 13 is controlled to be shut off, the spray water supply system 14 is controlled to supply water to the wet membrane 15, the fresh air inlet 67 is controlled to be opened, the indoor air inlet 63 is controlled to be opened, the indoor air outlet 64 is controlled to be opened, and the indoor fan 24 is controlled to be operated. Thus, through the spray water supply system 14 supplying water to the wet membrane 15, the wet membrane 15 can exchange heat with the indoor air. The water on the wet membrane 15 absorbs heat and evaporates, the indoor air is cooled down, and the humidity increases. The heat exchange medium enters the indoor coil 11, and the heat exchange medium exchanges heat with the indoor air indirectly through the indoor coil 11, which can realize the secondary cooling of the indoor air, thereby cooling the indoor air down.

[0161] Meanwhile, compared to the outdoor coil 12 only exchanging heat with the outdoor air when the cooling unit 100 is running in dry mode, the cooling unit 100 is running in evaporative cooling mode. The indoor air heat exchange effect is enhanced by the wet film 15, which improves the cooling efficiency of the heat exchange medium at the outdoor coil 12, thereby improving the cooling effect and cooling efficiency of the indirect heat exchange system 1.

[0162] Among them, the outdoor air intake switching wet-bulb temperature Two2 and the outdoor air intake switching wet-bulb temperature Two1 are both preset temperatures.

[0163] In some embodiments of the present invention, such as Figure 3 As shown, the sprinkler water supply system 14 is also used to spray water onto the outdoor coil 12, and the control method further includes:

[0164] If the outdoor inlet wet-bulb temperature Tw is determined to be less than the outdoor inlet switching wet-bulb temperature Two2, it can be understood that the spray water supply system 14 can keep 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, and the heat exchange medium indirectly exchanges heat with the indoor air through the indoor coil 11, thereby 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 Two2, the evaporative cooling effect of the spray device 142 is good, and the spray water supply system 14 can be turned on to spray water onto the outdoor coil 12 to improve the cooling effect of the cooling unit 100.

[0165] The cooling unit 100 is controlled to operate in spray mode. The fresh air inlet 67 is closed, the indoor air inlet 63 is opened, and the circulating water pump 13 is turned on. The spray water supply system 14 sprays water onto the outdoor coil 12 and stops supplying water to the wet film 15. Thus, by spraying water onto the outdoor coil 12, the temperature of the heat exchange medium inside the outdoor coil 12 is reduced. 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 and the indoor air in the indoor coil 11. 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 can improve the cooling effect of the indoor air on equipment to be cooled, such as data centers.

[0166] 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 spray mode, which enhances the heat transfer performance of the outdoor coil 12 through the spray water supply 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.

[0167] In some embodiments of the present invention, such as Figure 2 and Figure 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:

[0168] It is understood that after determining that the outdoor intake wet-bulb temperature Tw is greater than the outdoor intake switching wet-bulb temperature Two1, it is understood that after determining that the outdoor intake dry-bulb temperature Td is greater than the outdoor intake switching temperature To1, indicating that the outdoor temperature is high, and then determining that the outdoor intake wet-bulb temperature Tw is greater than the outdoor intake switching wet-bulb temperature Two1, it means that the outdoor intake wet-bulb temperature and humidity are high, the air is close to saturation, and the amount of heat removed by the evaporation of water supplied by the spray water supply system 14 to the wet film 15 and sprayed to the outdoor coil 12 is less. At this time, the cooling efficiency of the indirect heat exchange system 1 decreases, and the cooling unit 100 cannot meet the cooling effect of the equipment to be cooled by operating only in evaporative cooling mode or spray mode.

[0169] The cooling unit 100 is controlled to operate in a mixed mode, with the circulating water pump 13 starting, the spray water supply system 14 supplying water to the wet film 15 and stopping spraying water to the outdoor coil 12, the indoor fan 24 running, the indoor air outlet 64 opening, the indoor air inlet 63 opening, the fresh air inlet 67 closing, and the compressor 21 running. Specifically, during the 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, condensing and dissipating heat. After heat exchange is completed 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 the circulation of refrigerant in the refrigeration circuit.

[0170] Therefore, by combining the advantages of indirect heat exchange system 1 and refrigeration system 2, the cooling effect of cooling unit 100 can be improved, enabling cooling unit 100 to adapt to various climates throughout the year, and significantly improving the adaptability, energy efficiency and reliability of cooling unit 100.

[0171] In some embodiments of the present invention, the control method further includes:

[0172] 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 > Two1;

[0173] 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.

[0174] 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 Two1 and less than or equal to the supply air setting temperature Tset of the device 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 device 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.

[0175] It should be noted that the air supply set temperature Tset of the equipment to be cooled is a preset temperature.

[0176] 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 Two1 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.

[0177] Other configurations and operations of the cooling unit 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0178] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is 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.

[0179] 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, include: An indirect heat exchange system includes an indoor coil, an outdoor coil, and a circulating water pump. The indoor coil and the outdoor coil are connected end to end to form a heat exchange loop. The circulating water pump 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. A wet film is disposed adjacent to the indoor coil.

2. The cooling unit according to claim 1, characterized in that, The indirect heat exchange system also includes: A spray water supply system is used to supply water to the wet film.

3. The cooling unit according to claim 2, characterized in that, The spray water supply system includes: Water tank; A spray water supply pump is used to drive water in the water tank to flow to the wet membrane.

4. The cooling unit according to claim 3, characterized in that, The spray water supply system also includes: The water tank, with the lower end of the wet membrane located inside the water tank, and the spray water supply pump used to drive the water in the water tank to flow towards the water tank or above the wet membrane.

5. The cooling unit according to claim 4, characterized in that, The water tank is connected to the water trough.

6. The cooling unit according to claim 5, characterized in that, A filter is provided between the water tank and the water trough.

7. The cooling unit according to claim 3, characterized in that, The spray water pump is also used to drive the water in the water tank to spray water onto the outdoor coil.

8. The cooling unit according to claim 7, characterized in that, The spray water supply system also includes: A sprinkler system is provided, which is connected to the water tank. The sprinkler system is used to spray water onto the outdoor coil, and the sprinkler water supply pump is used to drive the water in the water tank to flow to the sprinkler system.

9. The cooling unit according to claim 8, characterized in that, The spraying device includes: A manifold extends along the length of the outdoor coil and is connected at one end to the water tank. The manifold is provided with a plurality of spray holes, which are arranged facing the outdoor coil and spaced apart along the length of the manifold.

10. The cooling unit according to claim 9, characterized in that, The spraying device also includes multiple nozzles, which are respectively located at multiple spray holes.

11. The cooling unit according to claim 7, characterized in that, The spray water supply system also includes: A water receiving tray is located below the outdoor coil and is connected to the water tank.

12. The cooling unit according to claim 11, characterized in that, A filter is provided between the water receiving tray and the water tank.

13. The cooling unit according to claim 8, characterized in that, A first valve is provided between the spraying device and the spraying water supply pump, and a second valve is provided between the spraying water supply pump and the wet film.

14. The cooling unit according to claim 1, characterized in that, At least one of the indoor coil and the outdoor coil includes: A heat exchange tube, which is connected to the heat exchange circuit; Fins, which are connected to the outside of the heat exchange tube.

15. The cooling unit according to claim 1, characterized in that, The cooling unit also includes: The housing has a spaced-out indoor space and an outdoor space, the indoor space has an indoor air inlet and an indoor air outlet, the indoor coil and the wet film are located in the indoor space, and the outdoor coil is located in the outdoor space; An indoor fan is used to drive airflow from the indoor air inlet to the indoor air outlet.

16. The cooling unit according to claim 15, characterized in that, The indoor space has a fresh air inlet, and the indoor fan is also used to drive airflow from the fresh air inlet to the indoor air outlet.

17. The cooling unit according to claim 16, characterized in that, A fresh air valve is provided at the fresh air inlet for opening or closing the fresh air inlet; And / or, the indoor air inlet is provided with a return air valve for opening or closing the indoor air inlet.

18. The cooling unit according to claim 16, characterized in that, 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 located on the partition, and the indoor air inlet and indoor air outlet are located on the housing.

19. The cooling unit according to claim 15, characterized in that, The indoor fan is located at the indoor air outlet.

20. The cooling unit according to claim 15, characterized in that, The indoor fans are multiple units arranged at intervals.

21. The cooling unit according to claim 15, characterized in that, The cooling unit also includes a refrigeration system, which includes: The system includes a compressor, an outdoor heat exchanger, and an indoor heat exchanger, which 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.

22. The cooling unit according to claim 21, characterized in that, The compressors are multiple units connected in parallel; Alternatively, the compressor may be a single unit, and the compressor may be a magnetic levitation compressor.

23. The cooling unit according to claim 21, characterized in that, The indoor coil and the indoor heat exchanger are arranged in sequence along the airflow direction.

24. The cooling unit according to claim 21, characterized in that, The outdoor space has an outdoor air inlet and an outdoor air outlet provided on the casing, and the cooling unit further includes: An outdoor fan is used to drive airflow from the outdoor air inlet to the outdoor air outlet.

25. The cooling unit according to claim 24, characterized in that, Along the airflow direction, the outdoor coil and the outdoor heat exchanger are arranged in sequence. The outdoor heat exchanger has a heat exchange flow path, which is connected in series between the compressor and the indoor heat exchanger.

26. The cooling unit according to claim 25, characterized in that, The indirect heat exchange system also includes: A spray water supply system is used to spray water simultaneously onto the outdoor coil and the outdoor heat exchanger.

27. The cooling unit according to claim 24, characterized in that, The outdoor fans are multiple units arranged at intervals.

28. The cooling unit according to claim 24, characterized in that, The outdoor fan is located at the outdoor air outlet.

29. A control method for a cooling unit, characterized in that, The cooling unit is a cooling unit according to any one of claims 1-28, and the control method includes: Obtain the outdoor intake dry bulb temperature Td; If the outdoor intake dry bulb temperature Td is determined to be less than or equal to the outdoor intake switching temperature To2, the cooling unit is controlled to operate in dry mode, the circulating water pump is started, and the wet film stops working.

30. The control method for the cooling unit according to claim 29, characterized in that, The cooling unit further includes a casing and an indoor fan. The casing has a spaced-out indoor space and an outdoor space. The indoor space has a fresh air inlet, an indoor air intake, and an indoor air outlet. The indoor coil and the wet film are located in the indoor space, and the outdoor coil is located in the outdoor space. The indoor fan drives airflow from the indoor air intake and the fresh air inlet to the indoor air outlet. The control method further includes: 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; 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 set humidity of the supply air of the equipment to be cooled. The cooling unit is controlled to operate in direct ventilation mode, the circulating water pump is controlled to be turned off, the fresh air inlet is opened, the indoor air inlet is opened, the indoor air outlet is opened, and the indoor fan is running.

31. The control method for the cooling unit according to claim 30, characterized in that, The control method further includes: Determine that the supply air humidity Tw1 of the equipment to be cooled is less than Twset-10% or greater than Twset+10%; The cooling unit is controlled to operate in dry mode, the circulating water pump is started, and the wet film stops working.

32. The control method for the cooling unit according to claim 30, characterized in that, The indirect heat exchange system further includes a spray water supply system for supplying water to the wet film, and the control method further includes: Ensure that the outdoor intake dry bulb temperature Td is greater than the outdoor intake switching temperature To1; Obtain the outdoor intake wet-bulb temperature Tw; Determine that the outdoor intake wet-bulb temperature Tw is greater than or equal to the outdoor intake switching wet-bulb temperature Two2 and less than the outdoor intake switching wet-bulb temperature Two1, where Two1>Two2; The system controls the cooling unit to operate in evaporative cooling mode, controls the circulating water pump to shut down, controls the spray water supply system to supply water to the wet film, controls the fresh air inlet to open, the indoor air inlet to open, the indoor air outlet to open, and the indoor fan to run.

33. The control method for the cooling unit according to claim 32, characterized in that, The sprinkler water supply system is also used to spray water onto the outdoor coil, and the control method further includes: Ensure that the outdoor intake wet-bulb temperature Tw is less than the outdoor intake switching wet-bulb temperature Two2. The cooling unit is controlled to operate in spray mode, the fresh air inlet is closed, the indoor air inlet is opened, the indoor air outlet is opened, and the circulating water pump is turned on. The spray water supply system sprays water onto the outdoor coil and stops supplying water to the wet film.

34. The control method for the cooling unit according to claim 32, characterized in that, 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: Ensure that the outdoor intake wet-bulb temperature Tw is greater than the outdoor intake switching wet-bulb temperature Two1. The cooling unit is controlled to operate in a mixed mode, including starting the circulating water pump, supplying water to the wet film through the spray water supply system and stopping spraying water to the outdoor coil, running the indoor fan, opening the indoor air outlet, opening the indoor air inlet, closing the fresh air inlet, and running the compressor.

35. The control method for the cooling unit according to claim 34, characterized in that, The control method further includes: 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 is controlled to run at the first frequency, where Tset > Two1; 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 is controlled to run at a second frequency, which is greater than the first frequency.

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