Indirect evaporative cooling air conditioning system

Abstract

This application discloses an indirect evaporative cooling air conditioning system, comprising: a cabinet with an indoor and an outdoor channel; an indoor return air vent and an indoor supply air vent connected via the indoor channel; and an outdoor air inlet and an outdoor air outlet connected via the outdoor channel; an air-to-air heat exchanger located within the cabinet and connected to both the indoor and outdoor channels; a spray mechanism located within the outdoor channel between the air-to-air heat exchanger and the outdoor air outlet; a compressor refrigeration circuit including an evaporator located within the indoor channel between the air-to-air heat exchanger and the indoor supply air vent; a heat exchange assembly including at least one first heat exchange coil located within the indoor channel; and an underground heat exchange coil located outside the cabinet, with its outlet connected to the inlet of the first heat exchange coil for heat exchange with an underground natural cold source. This air conditioning system can utilize natural cooling capacity more efficiently and reduce energy consumption.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, and in particular to indirect evaporative cooling air conditioning systems. Background Technology

[0002] With the booming development of the digital economy, data centers are being built on an increasingly large scale, which also brings enormous power consumption. Nearly 90% of this electricity is converted into heat and dissipated. Therefore, more and more people are focusing on energy-saving technologies for data centers. This approach not only provides the necessary heat but also significantly reduces the energy consumption of air conditioning units, achieving two goals at once.

[0003] Indirect evaporative cooling air conditioning units are becoming increasingly widely used due to their natural cooling function. However, under high load conditions, these units mainly rely on indirect evaporation and the compressor to provide cooling capacity. The drawback of this approach is that when a large amount of cooling is required in summer, the unit mainly relies on the compressor, increasing the energy consumption of the indirect evaporative cooling air conditioning unit. Utility Model Content

[0004] This application provides an indirect evaporative cooling air conditioning system. The indirect evaporative cooling air conditioning system can reduce the operating time of the compressor while utilizing underground natural cold sources for heat exchange, making more efficient use of natural cooling capacity, improving the operating efficiency of the air conditioning unit, and reducing the energy consumption of the air conditioning unit.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] An indirect evaporative cooling air conditioning system, comprising:

[0007] The server rack has an indoor return air vent, an indoor supply air vent, an outdoor air inlet, and an outdoor air outlet. The server rack has an indoor passageway and an outdoor passageway inside. The indoor return air vent and the indoor supply air vent are connected through the indoor passageway, and the outdoor air inlet and the outdoor air outlet are connected through the outdoor passageway.

[0008] An air-to-air heat exchanger is located inside the cabinet and is connected to both the indoor passage and the outdoor passage to allow heat exchange between the indoor passage and the outdoor passage.

[0009] A spraying mechanism is located in the outdoor passage between the air-to-air heat exchanger and the outdoor air outlet, and is used to spray cooling water toward the air-to-air heat exchanger.

[0010] A compressor refrigeration circuit includes a compressor, a condenser, an expansion valve, and an evaporator connected in sequence to form the circuit. The evaporator is located in the indoor passage between the air-to-air heat exchanger and the indoor air outlet, and the condenser is located in the outdoor passage between the spray mechanism and the outdoor air outlet.

[0011] A heat exchange assembly includes at least one first heat exchange coil located within the indoor passageway;

[0012] An underground heat exchange coil is located outside the cabinet. The outlet of the underground heat exchange coil is connected to the inlet of the first heat exchange coil. The underground heat exchange coil is used to exchange heat with an underground natural cold source.

[0013] The aforementioned indirect evaporative cooling air conditioning system includes a cabinet, an air-to-air heat exchanger, a spray mechanism, a compression refrigeration circuit, heat exchange components, and an underground heat exchange coil. The indoor return air vents and indoor supply air vents on the cabinet can connect to the computer room. The underground heat exchange coils can exchange heat with an underground natural cold source, providing cooling capacity to the first heat exchange coil of the heat exchange components. Indoor return air enters the cabinet from the indoor return air vents, then passes through the air-to-air heat exchanger, the first heat exchange coil of the heat exchange components, and the evaporator of the compressor refrigeration circuit, exchanging heat with the air-to-air heat exchanger, the first heat exchange coil, or the compressor to form indoor supply air, which is then delivered to the computer room through the indoor supply air vents. In other words, the aforementioned indirect evaporative cooling air conditioning system can achieve indirect evaporative cooling through the air-to-air heat exchanger and spray mechanism, or through compressor refrigeration via the compression refrigeration circuit, or through the exchange of natural cooling capacity provided by an underground natural cold source via the first heat exchange coil. This allows for heat exchange using the underground natural cold source while reducing compressor operating time, more efficiently utilizing natural cooling capacity, improving the operating efficiency of the air conditioning unit, and reducing its energy consumption.

[0014] Optionally, it also includes a water tray disposed in the cabinet, the water tray being located on the side of the air-to-air heat exchanger away from the spray mechanism, for receiving the cooling water sprayed by the spray mechanism.

[0015] In the aforementioned indirect evaporative cooling air conditioning system, the water tray can catch the cooling water left on the air-to-air heat exchanger when the spray mechanism sprays cooling water onto the air-to-air heat exchanger, thus preventing the cooling water from flowing out of the cabinet.

[0016] Optionally, the inlet of the underground heat exchange coil is connected to the outlet of the first heat exchange coil.

[0017] In the above-mentioned indirect evaporative cooling air conditioning system, the inlet of the underground heat exchange coil can be directly connected to the outlet of the first heat exchange coil. The connection between the first heat exchange coil and the underground heat exchange coil can form a first water-cooled refrigeration circuit. The cooling water can first pass through the first heat exchange coil to perform the first stage of heat exchange with the indoor return air, thereby cooling the indoor return air, and then enter the underground heat exchange coil to perform the second stage of heat exchange with the external water cooling source.

[0018] Optionally, it also includes a water injection pipe, which is connected to the water pan, and the water injection pipe has a water injection valve;

[0019] The heat exchange assembly also includes a water pump, the inlet of which is connected to the water pan, and the outlet of which is connected to the inlet of the underground heat exchange coil.

[0020] The spraying mechanism is connected to the outlet of the first heat exchange coil.

[0021] In the aforementioned indirect evaporative cooling air conditioning system, the water pump, underground heat exchange coil, first heat exchange coil, spray mechanism, and water pan can form a second water-cooled refrigeration circuit, enabling heat exchange through the first heat exchange coil and the spray mechanism. The spray mechanism utilizes the water outlet from the first heat exchange coil for spraying, reducing the need for a separate traditional spray pump and thus improving the overall operating efficiency of the unit.

[0022] Optionally, it also includes a circulation pump, the inlet of which is connected to the outlet of the underground heat exchange coil, and the outlet of the circulation pump is connected to the inlet of the first heat exchange coil, so that the outlet of the underground heat exchange coil is connected to the inlet of the first heat exchange coil.

[0023] In the aforementioned indirect evaporative cooling air conditioning system, the circulating pump can drive the cooling water to circulate in the water-cooled refrigeration circuit.

[0024] Optionally, the outlet of the water pump is connected to the inlet of the underground heat exchange coil through a first pipeline, and a first water valve is provided on the first pipeline.

[0025] The outlet of the first heat exchange coil is connected to the inlet of the underground heat exchange coil through a second pipeline, and a second water valve is installed on the second pipeline.

[0026] The outlet of the first heat exchange coil is connected to the spray mechanism through a third pipeline, and a third water valve is installed on the third pipeline.

[0027] In the aforementioned indirect evaporative cooling air conditioning system, the first water-cooled refrigeration circuit can perform cooling when the second water valve and the circulating pump are opened, and the pumping pump, the first water valve, and the third water valve are closed; while the second water-cooled refrigeration circuit can perform cooling when the pumping pump, the first water valve, the circulating pump, and the third water valve are opened, and the second water valve is closed; different water-cooled refrigeration modes can be switched according to the different cooling capacity requirements of the air conditioning unit.

[0028] Optionally, the outlet of the underground heat exchange coil is connected to the inlet of the circulating pump through a fourth pipeline, and a fourth water valve is installed on the fourth pipeline.

[0029] The heat exchange assembly further includes a second heat exchange coil, which is located in the outdoor channel between the spray mechanism and the condenser. The inlet of the second heat exchange coil is connected to the outlet of the first heat exchange coil, and the outlet of the second heat exchange coil is connected to the inlet of the circulating pump through a fifth pipeline. A fifth water valve is provided on the fifth pipeline.

[0030] In the aforementioned indirect evaporative cooling air conditioning system, when the fourth water valve and circulating pump are opened and other valves are closed, the first and second heat exchange coils can form a third water-cooled refrigeration circuit. Outdoor air entering through the second heat exchange coil can cool the cooling water inside the coil. By cooling the second heat exchange coil, the cooling capacity of the first heat exchange coil can be increased, thereby reducing the power of the first fan and improving the overall operating efficiency of the unit.

[0031] Optionally, it also includes a control unit, which is signal-connected to the circulating pump, the water pump, the compressor, the first water valve, the second water valve, the third water valve, the fourth water valve, the fifth water valve, and the water injection valve. The control unit is used to control the working status of the circulating pump, the water pump, the compressor, the first water valve, the second water valve, the third water valve, the fourth water valve, the fifth water valve, and the water injection valve according to the target cooling capacity.

[0032] In the aforementioned indirect evaporative cooling air conditioning system, the control unit controls the operating status of the circulating pump, water pump, compressor, first water valve, second water valve, third water valve, fourth water valve, fifth water valve, and water injection valve according to the target cooling capacity. This enables the switching of multiple cooling modes of the air conditioning unit and improves the operating efficiency of the air conditioning unit.

[0033] Optionally, the first heat exchange coil is located between the air-to-air heat exchanger and the indoor air supply outlet, and / or between the indoor return air outlet and the air-to-air heat exchanger.

[0034] In the aforementioned indirect evaporative cooling air conditioning system, the first heat exchange coil in the indoor passage can exchange heat with the indoor return air passing through the indoor passage, thereby cooling the indoor return air.

[0035] Optionally, it also includes the first and second fans;

[0036] The first fan is located in the indoor passage, and the first fan is located near the indoor air supply outlet, or between the indoor return air outlet and the air-to-air heat exchanger;

[0037] The second fan is located at the outdoor air outlet.

[0038] In the aforementioned indirect evaporative cooling air conditioning system, the first fan in the indoor duct can drive the airflow direction of the indoor return air, and the second fan at the outdoor air outlet can drive the airflow direction of the outdoor intake air. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of an indirect evaporative cooling air conditioning system provided in an embodiment of this application;

[0040] Figure 2 This is a schematic diagram of an indirect evaporative cooling air conditioning system provided in an embodiment of this application.

[0041] icon:

[0042] 1-Cabinet; 2-Air-to-Air Heat Exchanger; 3-Spray Mechanism; 41-Compressor; 42-Condenser; 43-Expansion Valve; 44-Evaporator; 51-First Heat Exchange Coil; 52-Second Heat Exchange Coil; 53-Water Pump; 54-Circulation Pump; 6-Underground Heat Exchange Coil; 7-Water Pan; 71-Water Injection Valve; 8-First Fan; 9-Second Fan; S1-First Water Valve; S2-Second Water Valve; S3-Third Water Valve; S4-Fourth Water Valve; S5-Fifth Water Valve. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Please refer to Figure 1 This application provides an indirect evaporative cooling air conditioning system, comprising:

[0045] Cabinet 1 has an indoor return air vent, an indoor supply air vent, an outdoor air inlet, and an outdoor air outlet. The interior of cabinet 1 has an indoor passage and an outdoor passage. The indoor return air vent and the indoor supply air vent are connected through the indoor passage, and the outdoor air inlet and the outdoor air outlet are connected through the outdoor passage.

[0046] The air-to-air heat exchanger 2 is located inside the cabinet 1. The air-to-air heat exchanger 2 is connected to both the indoor channel and the outdoor channel so that the indoor channel and the outdoor channel can exchange heat.

[0047] Spraying mechanism 3 is located in the outdoor passage between air-to-air heat exchanger 2 and outdoor air outlet. Spraying mechanism 3 is used to spray cooling water toward air-to-air heat exchanger 2.

[0048] The compressor refrigeration circuit includes a compressor 41, a condenser 42, an expansion valve 43 and an evaporator 44 connected in sequence to form the circuit. The evaporator 44 is located in the indoor passage between the air-to-air heat exchanger 2 and the indoor air outlet, and the condenser 42 is located in the outdoor passage between the spray mechanism 3 and the outdoor air outlet.

[0049] The heat exchange assembly includes at least one first heat exchange coil 51, which is located within the indoor passage.

[0050] The underground heat exchange coil 6 is located outside the cabinet 1. The outlet of the underground heat exchange coil 6 is connected to the inlet of the first heat exchange coil 51. The underground heat exchange coil 6 is used to exchange heat with the underground natural cold source.

[0051] The indirect evaporative cooling air conditioning system provided in this application embodiment includes a cabinet 1, an air-to-air heat exchanger 2, a spray mechanism 3, a compression refrigeration circuit, a heat exchange component, and an underground heat exchange coil. The indoor return air vent and indoor supply air vent on the cabinet 1 can be connected to the computer room. The underground heat exchange coil can exchange heat with the underground natural cold source to provide cooling capacity for the first heat exchange coil 51 of the heat exchange component. After the indoor return air enters the cabinet 1 from the indoor return air vent, it can pass through the air-to-air heat exchanger 2, the first heat exchange coil 51 of the heat exchange component, and the evaporator 44 of the compressor refrigeration circuit to exchange heat with the air-to-air heat exchanger 2, the first heat exchange coil 51, or the compressor to form indoor supply air, which is then sent into the computer room through the indoor supply air vent. The aforementioned indirect evaporative cooling air conditioning system can achieve indirect evaporative cooling through the air-to-air heat exchanger 2 and the spray mechanism 3, or through the compression refrigeration circuit for compressor 41 to perform refrigeration, or through the first heat exchange coil 51 to exchange with the natural cooling capacity provided by the underground natural cold source to achieve refrigeration. It can reduce the operating time of compressor 41 while utilizing the underground natural cold source for heat exchange, making more efficient use of natural cooling capacity, improving the operating efficiency of the air conditioning unit, and reducing the energy consumption of the air conditioning unit.

[0052] The underground natural cold source can be an underground water source or a geothermal source. The underground heat exchange coil 6 can be pre-buried underground. Since the underground cold source is relatively stable and not affected by the outdoor ambient temperature, the heat exchange of the underground heat exchange coil 6 is also continuous and stable. Because the temperature of the underground natural cold source is constant, using the underground natural cold source for heat exchange expands the application range of natural cooling.

[0053] Alternatively, the underground natural cold source can be lake water, with the underground heat exchange coil 6 arranged in the lake. Optionally, the type of underground natural cold source is not limited here and will be determined based on the actual situation.

[0054] Specifically, the cabinet of rack 1 can be rectangular in shape. Rack 1 may include a top plate and a bottom plate arranged opposite each other, as well as four side plates located between the top plate and the bottom plate. The outdoor air outlet can be located on the top plate, the indoor return air outlet and the indoor supply air outlet can be located on two opposite side plates, and the outdoor air inlet can be located on the other side plate. Optionally, the indoor return air outlet, the indoor supply air outlet, the outdoor air inlet, and the outdoor air outlet can also be located in other positions, without limitation, depending on the actual situation. The indoor return air outlet and the indoor supply air outlet are connected to the computer room, and the outdoor air inlet and the outdoor air outlet are connected to the outside atmosphere of the computer room.

[0055] Specifically, the spraying mechanism 3 may include a spray pipe and multiple spray nozzles disposed on the spray pipe, and the spraying mechanism 3 sprays cooling water onto the air-to-air heat exchanger 2 through the spray nozzles.

[0056] The indirect evaporative cooling air conditioning system provided in this application is an indirect evaporative cooling air conditioning system with multiple functions. The indirect evaporative cooling air conditioning system can be divided into four parts: indoor air-side circulation section, outdoor air-side circulation section, refrigerant circulation section, and water-side circulation section.

[0057] The airflow organization of the indoor air-side circulation section is as follows: the return air from the machine room first enters the air-to-air heat exchanger 2, then the first heat exchange coil 51, and finally passes through the evaporator 44 and is sent into the machine room.

[0058] The airflow organization of the outdoor wind-side circulation section is such that the outdoor air intake first passes through the air-to-air heat exchanger 2, then through the condenser 42, and is directly discharged to the outdoor atmospheric environment.

[0059] The refrigerant circulation section consists of four main components of the compression refrigeration circuit: compressor 41, condenser 42, expansion valve 43, and evaporator 44.

[0060] In the water-side circulation section, the unit's inlet water first undergoes the first stage of heat exchange through the underground heat exchange coil 6, and then enters the cabinet 1 for the second stage of heat exchange through the first heat exchange coil 51.

[0061] In this embodiment, the first heat exchange coil 51 may be located between the air-to-air heat exchanger 2 and the indoor air supply outlet, and / or between the indoor return air outlet and the air-to-air heat exchanger 2. This is not limited here and depends on the actual situation, as long as the first heat exchange coil 51 is located within the indoor passageway. For example, the first heat exchange coil 51 may be located between the air-to-air heat exchanger 2 and the evaporator 44, or it may include two first heat exchange coils 51, one located between the indoor return air outlet and the air-to-air heat exchanger 2, and the other located between the air-to-air heat exchanger 2 and the evaporator 44.

[0062] In this embodiment of the application, the indirect evaporative cooling air conditioning system may further include a first fan 8 and a second fan 9; the first fan 8 is located in the indoor passage, and is set near the indoor air supply outlet, or is located between the indoor return air outlet and the air-to-air heat exchanger 2, and can drive the airflow direction of the indoor return air; the second fan 9 is set at the outdoor air outlet and can drive the airflow direction of the outdoor air intake.

[0063] Specifically, the first fan 8 can be located between the condenser 42 and the indoor air supply outlet, or the first fan 8 can also be located between the indoor return air outlet and the air-to-air heat exchanger 2. The first fan 8 is not limited to either a blowing type or a suction type.

[0064] In this embodiment, the indirect evaporative cooling air conditioning system may further include a water tray 7 disposed within the cabinet 1. The water tray 7 is located on the side of the air-to-air heat exchanger 2 away from the spray mechanism 3 and is used to catch the cooling water sprayed by the spray mechanism 3. The water tray 7 can catch the cooling water left on the air-to-air heat exchanger 2 when the spray mechanism 3 sprays cooling water onto the air-to-air heat exchanger 2, preventing the cooling water from flowing out of the cabinet.

[0065] Specifically, the spray mechanism 3 can be located on the outdoor passage and between the air-to-air heat exchanger 2 and the top plate of the cabinet 1, and the water tray 7 can be located between the air-to-air heat exchanger 2 and the bottom plate of the cabinet 1 to catch the cooling water sprayed by the spray mechanism 3.

[0066] Specifically, the air-to-air heat exchanger 2 can be arranged at any angle, without any restrictions here.

[0067] In this embodiment, the inlet of the underground heat exchange coil 6 can be connected to the outlet of the first heat exchange coil 51. Specifically, the inlet of the underground heat exchange coil 6 and the outlet of the first heat exchange coil 51 can be directly connected. The connection between the first heat exchange coil 51 and the underground heat exchange coil 6 can form a first water-cooled refrigeration circuit. The cooling water can first pass through the first heat exchange coil 51 to perform a first-stage heat exchange with the indoor return air, thereby cooling the indoor return air. Then, it enters the underground heat exchange coil 6 to perform a second-stage heat exchange with the external water cooling source, and so on, in a cycle.

[0068] Specifically, the indirect evaporative cooling air conditioning system may further include a circulating pump 54, the inlet of which is connected to the outlet of the underground heat exchange coil, and the outlet of the circulating pump 54 is connected to the inlet of the first heat exchange coil 51, so that the outlet of the underground heat exchange coil is connected to the inlet of the first heat exchange coil 51. The circulating pump 54 can drive cooling water to circulate in the first water-cooled refrigeration circuit.

[0069] In this embodiment, the spraying mechanism 3 can be connected to an independent water source to provide cooling water to the spraying mechanism 3.

[0070] Optionally, the spray mechanism 3 can also be connected to the outlet of the first heat exchange coil 51 to supply water through the first heat exchange coil 51. Specifically, the indirect evaporative cooling air conditioning system can also include a water injection pipe connected to the water pan 7, and the water injection pipe has a water injection valve 71; the heat exchange assembly can also include a water pump 53, the inlet of the water pump 53 is connected to the water pan 7, and the outlet of the water pump 53 is connected to the inlet of the underground heat exchange coil; the spray mechanism 3 is connected to the outlet of the first heat exchange coil 51.

[0071] In the aforementioned indirect evaporative cooling air conditioning system, the water pump 53, underground heat exchange coil 6, first heat exchange coil 51, spray mechanism 3, and water pan 7 can form a second water-cooled refrigeration circuit. Specifically, the water injection valve 71 can be opened first to fill the water pan 7 to the highest water level. At the same time, the water pump 53 is turned on. The cooling water first passes through the underground pre-buried heat exchange coil 6 to complete the first stage of heat exchange with the underground natural cold source, and then enters the first heat exchange coil 51 to complete the second stage of heat exchange, reducing the outlet air temperature at the indoor air outlet of the air conditioning unit. Then, it is sprayed through the spray mechanism 3 onto the air-to-air heat exchanger 2 for evaporative heat exchange, and finally falls into the water pan 7, and then enters the underground pre-buried heat exchange coil 6 to exchange heat with the underground natural cold source. During the circulation of cooling water in the second water-cooled refrigeration circuit, when the water level in the water pan 7 is lower than the preset low water level, the injection valve opens to inject water, and when the water level is filled to the highest water level, the water injection valve 71 can be closed to stop the water injection into the water pan 7. Using the water outlet of the first heat exchange coil 51 for spraying can reduce the need for a separate traditional spray water pump, thereby improving the overall operating efficiency of the unit.

[0072] In this embodiment of the application, the indirect evaporative cooling system may have a first refrigeration cycle loop alone, or it may have a second refrigeration cycle loop alone.

[0073] Alternatively, the indirect evaporative cooling air conditioning system can realize both the first refrigeration cycle loop and the second water-cooled refrigeration loop, achieving different water-cooled refrigeration modes. Specifically, the outlet of the water pump 53 is connected to the inlet of the underground heat exchange coil through a first pipeline, on which a first water valve S1 is installed; the outlet of the first heat exchange coil 51 is connected to the inlet of the underground heat exchange coil through a second pipeline, on which a second water valve S2 is installed; and the outlet of the first heat exchange coil 51 is connected to the spray mechanism 3 through a third pipeline, on which a third water valve S3 is installed.

[0074] In the aforementioned indirect evaporative cooling air conditioning system, when the second water valve S2 and the circulating pump 54 are opened, and the water pump 53, the first water valve S1, and the third water valve S3 are closed, the first water-cooled refrigeration circuit can perform refrigeration; while when the water pump 53, the first water valve S1, the circulating pump 54, and the third water valve S3 are opened, and the second water valve S2 is closed, the second water-cooled refrigeration circuit can perform refrigeration; different water-cooled refrigeration modes can be switched according to the different cooling capacity requirements of the air conditioning unit.

[0075] Specifically, the first heat exchange coil 51 may have one outlet, and the underground heat exchange coil 6 and the spray mechanism 3 may be connected to the same outlet of the first heat exchange coil 51; the first heat exchange coil 51 may also have two outlets, and the underground heat exchange coil 6 and the spray mechanism 3 may be connected to different outlets on the first heat exchange coil 51. The number of outlets of the first heat exchange coil 51 is not limited here and depends on the actual situation.

[0076] In the embodiments of this application, such as Figure 2 As shown, the outlet of the underground heat exchange coil and the inlet of the circulating pump 54 can be connected through a fourth pipeline, on which a fourth water valve S4 is installed; the heat exchange assembly also includes a second heat exchange coil 52, which is located in the outdoor passage between the spray mechanism 3 and the condenser 42. The inlet of the second heat exchange coil 52 is connected to the outlet of the first heat exchange coil 51, and the outlet of the second heat exchange coil 52 is connected to the inlet of the circulating pump 54 through a fifth pipeline, on which a fifth water valve S5 is installed.

[0077] In the aforementioned indirect evaporative cooling air conditioning system, when the fourth water valve S4 and the circulating pump 54 are opened, and other valves are closed, the first heat exchange coil 51 and the second heat exchange coil 52 can form a third water-cooled refrigeration circuit. In this circuit, indoor return air passes through the first heat exchange coil 51, exchanging heat with the circulating cooling water within it, thus cooling the indoor return air. Outdoor intake air passes through the second heat exchange coil 52, which cools the cooling water within it. By cooling the second heat exchange coil 52, the cooling capacity of the first heat exchange coil 51 can be increased, thereby reducing the power of the first fan 8 and improving the overall operating efficiency of the unit.

[0078] Optionally, the indirect evaporative cooling air conditioning system may also include a control unit. The control unit is connected to the circulating pump 54, the water pump 53, the compressor 41, the first water valve S1, the second water valve S2, the third water valve S3, the fourth water valve S4, the fifth water valve S5, and the water injection valve 71. The control unit is used to control the working status of the circulating pump 54, the water pump 53, the compressor 41, the first water valve S1, the second water valve S2, the third water valve S3, the fourth water valve S4, the fifth water valve S5, and the water injection valve 71 according to the target cooling capacity. This enables the switching of multiple cooling modes of the air conditioning unit and improves the operating efficiency of the air conditioning unit.

[0079] Specifically, the first water valve S1 to the fifth water valve S5 and the water injection valve 71 can be two-way valves. Alternatively, the first water valve S1 and the fifth water valve S5 can be replaced by a three-way valve, and the second water valve S2 and the fourth water valve S4 can be replaced by a three-way valve. There are no restrictions here, and it depends on the actual situation.

[0080] Specifically, such as Figure 2 The specific working process of the indirect evaporative cooling air conditioning system shown can be as follows:

[0081] When the target cooling capacity of the air conditioner is low, it can be set to natural cooling mode. The air conditioner achieves cooling through the third water-cooled cooling circuit. The circulation pump 54 is turned on, the fourth water valve S4 is opened, and other valves are closed. The circulating cooling water first enters the second heat exchange coil 52 for cooling, and then enters the first heat exchange coil 51 to cool the air in the machine room. This cycle continues.

[0082] When the target cooling capacity cannot be provided in natural cooling mode, the circulating cooling water of the air conditioning unit can start external circulation. The air conditioner achieves cooling through the first water-cooled refrigeration circuit. The fourth water valve S4 is closed, and the second water valve S2 and the fifth water valve S5 are opened. The circulating cooling water first passes through the underground pre-buried heat exchange coil 6 to complete the first stage of heat exchange with the underground natural cold source, and then enters the first heat exchange coil 51 to complete the second stage of heat exchange with the indoor return air, reducing the outlet air temperature at the indoor air outlet of the air conditioner. Finally, it enters the underground pre-buried heat exchange coil 6 again to exchange heat with the underground water source.

[0083] When the first water-cooled refrigeration circuit still cannot provide the target cooling capacity, the water injection valve 71 can be opened to fill the water pan 7 to the high water level. The second water valve S2 is then closed, and the first water valve S1 and the third water valve S3 are opened. Simultaneously, the water pump 53 is turned on, and the air conditioning unit enters spray mode. The circulating cooling water first passes through the underground pre-buried heat exchange coil 6 to complete the first stage of heat exchange with the underground natural cold source. Then, it enters the first heat exchange coil 51 to complete the second stage of heat exchange with the indoor return air, reducing the outlet air temperature at the air conditioning unit's indoor air supply vents. Finally, it is sprayed through the spray nozzles of the spray mechanism 3 onto the air-to-air heat exchanger 2 for evaporative heat exchange. The water in the water pan 7 is then returned to the underground pre-buried heat exchange coil 6 to exchange heat with the underground natural cold source. During the circulation process, when the water level in the water pan 7 falls below the low water level, the water injection valve 71 is opened to inject water, stopping when the high water level is reached.

[0084] If the indoor air supply temperature still does not reach the set value after the spray mode is turned on, and the target cooling capacity cannot be provided, the compressor 41 will be turned on again for forced cooling to reduce the indoor air supply temperature to the set value.

[0085] The above conditions cover the year-round operation of the indirect evaporative cooling air conditioning system unit of this application, with flow path adjustments and mode switching performed via valves. All of the above conditions ensure safe system operation and cooling output, and effectively reduce the annual energy consumption of the indirect evaporative cooling air conditioning system unit.

[0086] In this case, the aforementioned indirect evaporative cooling system may omit the second heat exchange coil 52, such as... Figure 1 As shown, this can also achieve the goal of reducing the annual energy consumption of indirect evaporative cooling units.

[0087] In this embodiment, all components of the indirect evaporative cooling air conditioning system can be prefabricated. Except for the pre-embedded underground heat exchange coil 6, other components can be arranged inside the cabinet 1 to form a prefabricated module, which saves space, improves the degree of prefabrication, and facilitates the assembly of the air conditioner.

[0088] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. An indirect evaporative cooling air conditioning system, characterized in that, include: The server rack has an indoor return air vent, an indoor supply air vent, an outdoor air inlet, and an outdoor air outlet. The server rack has an indoor passageway and an outdoor passageway inside. The indoor return air vent and the indoor supply air vent are connected through the indoor passageway, and the outdoor air inlet and the outdoor air outlet are connected through the outdoor passageway. An air-to-air heat exchanger is located inside the cabinet and is connected to both the indoor passage and the outdoor passage to allow heat exchange between the indoor passage and the outdoor passage. A spraying mechanism is located in the outdoor passage between the air-to-air heat exchanger and the outdoor air outlet, and is used to spray cooling water toward the air-to-air heat exchanger. A compressor refrigeration circuit includes a compressor, a condenser, an expansion valve, and an evaporator connected in sequence to form the circuit. The evaporator is located in the indoor passage between the air-to-air heat exchanger and the indoor air outlet, and the condenser is located in the outdoor passage between the spray mechanism and the outdoor air outlet. A heat exchange assembly includes at least one first heat exchange coil located within the indoor passageway; An underground heat exchange coil is located outside the cabinet. The outlet of the underground heat exchange coil is connected to the inlet of the first heat exchange coil. The underground heat exchange coil is used to exchange heat with an underground natural cold source.

2. The indirect evaporative cooling air conditioning system according to claim 1, characterized in that, It also includes a water tray installed inside the cabinet, the water tray being located on the side of the air-to-air heat exchanger away from the spray mechanism, for catching the cooling water sprayed out by the spray mechanism.

3. The indirect evaporative cooling air conditioning system according to claim 2, characterized in that, The inlet of the underground heat exchange coil is connected to the outlet of the first heat exchange coil.

4. The indirect evaporative cooling air conditioning system according to claim 2 or 3, characterized in that, It also includes a water injection pipe, which is connected to the water pan, and has a water injection valve on the water injection pipe; The heat exchange assembly also includes a water pump, the inlet of which is connected to the water pan, and the outlet of which is connected to the inlet of the underground heat exchange coil. The spraying mechanism is connected to the outlet of the first heat exchange coil.

5. The indirect evaporative cooling air conditioning system according to claim 4, characterized in that, It also includes a circulation pump, the inlet of which is connected to the outlet of the underground heat exchange coil, and the outlet of the circulation pump is connected to the inlet of the first heat exchange coil, so that the outlet of the underground heat exchange coil is connected to the inlet of the first heat exchange coil.

6. The indirect evaporative cooling air conditioning system according to claim 5, characterized in that, The outlet of the water pump is connected to the inlet of the underground heat exchange coil through a first pipeline, and a first water valve is installed on the first pipeline. The outlet of the first heat exchange coil is connected to the inlet of the underground heat exchange coil through a second pipeline, and a second water valve is installed on the second pipeline. The outlet of the first heat exchange coil is connected to the spray mechanism through a third pipeline, and a third water valve is installed on the third pipeline.

7. The indirect evaporative cooling air conditioning system according to claim 6, characterized in that, The outlet of the underground heat exchange coil is connected to the inlet of the circulating pump through a fourth pipeline, and a fourth water valve is installed on the fourth pipeline. The heat exchange assembly further includes a second heat exchange coil, which is located in the outdoor channel between the spray mechanism and the condenser. The inlet of the second heat exchange coil is connected to the outlet of the first heat exchange coil, and the outlet of the second heat exchange coil is connected to the inlet of the circulating pump through a fifth pipeline. A fifth water valve is provided on the fifth pipeline.

8. The indirect evaporative cooling air conditioning system according to claim 7, characterized in that, It also includes a control unit, which is signal-connected to the circulating pump, the water pump, the compressor, the first water valve, the second water valve, the third water valve, the fourth water valve, the fifth water valve, and the water injection valve. The control unit is used to control the working status of the circulating pump, the water pump, the compressor, the first water valve, the second water valve, the third water valve, the fourth water valve, the fifth water valve, and the water injection valve according to the target cooling capacity.

9. The indirect evaporative cooling air conditioning system according to claim 1, characterized in that, The first heat exchange coil is located between the air-to-air heat exchanger and the indoor air supply outlet, and / or the first heat exchange coil is located between the indoor return air outlet and the air-to-air heat exchanger.

10. The indirect evaporative cooling air conditioning system according to claim 1, characterized in that, It also includes the first and second fans; The first fan is located in the indoor passageway, and the first fan is located near the indoor air supply outlet; or, the first fan is located between the indoor return air outlet and the air-to-air heat exchanger. The second fan is located at the outdoor air outlet.

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