An indirect evaporative cooling device

Abstract

The present invention discloses an indirect evaporative cooling device, which includes a wind circulation system and an inner frame supporting it. The wind circulation system includes an air-to-air heat exchanger, a supply and return air fan assembly arranged at the return air inlet of the air-to-air heat exchanger, and an intake and exhaust air fan assembly arranged at the outdoor exhaust outlet of the air-to-air heat exchanger. It also includes a spraying system arranged on the inner frame. The spraying system includes a plurality of spraying pipes arranged at the outdoor air inlet of the air-to-air heat exchanger and used to convey high-pressure water into it through pipelines. A plurality of spraying holes capable of spraying the high-pressure water into water mist are arranged on each spraying pipe. In this application, the indoor temperature is reduced by means of fan circulation refrigeration and spraying pipe spraying refrigeration to achieve the purpose of controlling the indoor temperature. This cooling method uses the external natural low-temperature air source and normal-temperature water source to exchange heat with the indoor high-temperature return air, reducing the consumption of refrigeration energy and saving the refrigeration cost.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to an indirect evaporative cooling device. Background Art

[0002] In various data centers or computer rooms, maintaining the temperature of the internal environment is necessary for the operation of the data center and improving the reliability of servers and various devices. According to statistics, the power consumption of air-conditioning equipment used to maintain the temperature of the data center accounts for more than 40% of the total energy consumption of the data center. Therefore, it is imperative to adopt a more energy-efficient refrigeration solution in the data center.

[0003] Currently, conventional refrigeration equipment for data centers uses mechanical compression type computer room air conditioners such as air-cooled and water-cooled ones, or a refrigeration solution of a chiller plus a chilled water terminal computer room air conditioner.

[0004] With the introduction of indirect evaporative cooling technology in the field of data center refrigeration, some newly built data centers have adopted indirect evaporative cooling equipment as the refrigeration solution. In currently conventional indirect evaporative cooling equipment, the heat exchanger solution usually uses a metal air-to-air heat exchanger, and the indirect evaporation solution usually adopts a separate spraying method.

[0005] In the above cooling control solutions for data centers, in the mechanical compression type computer room air conditioner solution and the solution using a chiller plus a chilled water type computer room air conditioner terminal, the compressor components with high power consumption operate all year round, the equipment energy consumption is high, and the data center pPUE can only reach about 1.4 or 1.3. Summary of the Invention

[0006] In view of this, the main purpose of the present invention is to provide an energy-saving indirect evaporative cooling device, which saves the consumption of refrigeration energy while refrigerating and reduces the refrigeration cost.

[0007] An indirect evaporative cooling device of the present invention includes a housing, a wind circulation system located inside the housing, and an inner frame supporting it. The wind circulation system includes an air-to-air heat exchanger, a supply and return air fan assembly arranged at the return air inlet of the air-to-air heat exchanger for introducing indoor return air into the air-to-air heat exchanger through the return air inlet, exchanging heat with the outdoor cold air introduced therein, and then discharging it back into the room through the return air outlet, and an intake and exhaust air fan assembly arranged at the outdoor air outlet of the air-to-air heat exchanger for introducing the outdoor cold air into the air-to-air heat exchanger through the outdoor air inlet of the air-to-air heat exchanger, exchanging heat with the indoor return air introduced therein, and then discharging it outdoors through the outdoor air outlet.

[0008] It further includes a spray system disposed on the inner frame. The spray system includes a plurality of spray pipes disposed at the outdoor air inlet of the air-to-air heat exchanger and used to convey high-pressure water therein through pipelines. A plurality of spray holes for spraying the high-pressure water into water mist are disposed on each spray pipe and face the outdoor air inlet of the air-to-air heat exchanger.

[0009] As described above, the present application reduces the indoor temperature by means of fan cycle refrigeration and spray pipe spray refrigeration to achieve the purpose of controlling the indoor temperature. This cooling method exchanges heat between the natural low-temperature air source and normal-temperature water source in the outside world and the indoor high-temperature return air, reducing the consumption of refrigeration energy and saving the refrigeration cost.

[0010] Preferably, the spray system further includes a high-pressure pump for boosting the water pressure of the water source into the high-pressure water. The high-pressure pump is connected to the spray pipe through a pipeline.

[0011] Preferably, it further includes a sprinkler system disposed on the inner frame. The sprinkler system includes a plurality of sprinkler pipes disposed on the side of the outdoor air inlet of the air-to-air heat exchanger and used to convey water therein through pipelines. A plurality of sprinkler holes for spraying water to form water droplets are disposed on the sprinkler pipes and face the outdoor air inlet of the air-to-air heat exchanger.

[0012] As described above, the air intake and exhaust fan assembly introduces the outdoor cold air, the water mist and the water droplets formed at the outdoor air inlet into the air-to-air heat exchanger through the outdoor air inlet to exchange heat with the indoor return air introduced into the air-to-air heat exchanger by the supply and return air fan assembly through the return air inlet, so as to reduce the indoor temperature; the present application reduces the indoor temperature by combining fan cycle refrigeration, spray pipe spray refrigeration and sprinkler pipe water spray refrigeration to achieve the purpose of controlling the indoor temperature. This cooling method exchanges heat between the natural low-temperature air source and normal-temperature water source in the outside world and the indoor high-temperature return air, further reducing the consumption of refrigeration energy and saving the refrigeration cost more.

[0013] Preferably, the sprinkler system further includes a water tray connected to the water source and a circulation pump for pumping water from the water tray for circulation. The circulation pump is connected to the sprinkler pipe through a pipeline.

[0014] Preferably, the spray pipes and the sprinkler pipes are arranged in parallel on a spray rack.

[0015] As described above, the spray pipes and the sprinkler pipes are both arranged on the same spray rack, eliminating the need to separately provide a support for the sprinkler pipes, making full use of the space to make the structural layout compact and reducing the overall size of the cooling equipment.

[0016] Preferably, it further includes a compression refrigeration system. The compression refrigeration system includes an evaporator and a condenser.

[0017] The air-air heat exchanger is circumferentially inclined 45 degrees relative to the bottom of the inner frame along its length direction and is arranged on the inner frame.

[0018] The evaporator is arranged at the return air outlet of the air-air heat exchanger and is detachably fixed on the inner frame. The condenser is arranged at the outdoor air outlet of the air-air heat exchanger and is detachably fixed on the inner frame.

[0019] Thus, in this application, the indoor temperature is reduced by combining the refrigeration of the fan cycle, the spraying of the spray pipe, and the refrigeration of the compressor, or by combining the refrigeration of the refrigeration fan cycle, the spraying of the spray pipe, the spraying of the spray pipe with water, and the refrigeration of the compressor, so as to achieve the purpose of controlling the indoor temperature. This cooling method uses the external natural low-temperature air source and normal-temperature water source to exchange heat with the indoor high-temperature return air, further reducing the consumption of refrigeration energy and saving more refrigeration costs. In addition, the air-air heat exchanger is circumferentially inclined at a certain angle relative to the bottom of the inner frame along its length direction and is arranged on the inner frame. The evaporator is arranged at the return air outlet of the air-air heat exchanger, and the condenser is arranged at the outdoor air inlet of the air-air heat exchanger. When a compressor refrigeration system is required, the indoor high-temperature air extracted by the supply and return air fans passes through the pipeline and absorbs heat through the evaporator, so that the air at the return air outlet of the air-air heat exchanger is cooled and then sent back into the room through the return air outlet. The supply and return air fans extract the outdoor low-temperature air into the air-air heat exchanger and send it through the pipeline to the condenser arranged at the outdoor air outlet of the air-air heat exchanger to release heat and then discharge it outdoors through the outdoor air outlet. This setting can realize both the separate fan cycle refrigeration and the separate compressor refrigeration or the compressor refrigeration + fan cycle refrigeration through the air-air heat exchanger, and at the same time make the overall structure layout of the cooling equipment compact, reduce the overall size of the cooling equipment, so as to facilitate handling and reduce its occupied area.

[0020] Preferably, the supply and return air fan assembly includes a second supply and return air fan whose air outlet faces the return air inlet and is arranged along the length direction of the air-air heat exchanger, and a first supply and return air fan whose air suction port is adjacent to the air suction port of the second supply and return air fan and the center lines of the two are perpendicular.

[0021] Thus, when there are two or more supply and return air fans, some are placed vertically and some are placed laterally, so that the center lines of the first and second supply and return air fans are perpendicularly arranged. Compared with the arrangement method of placing the supply and return air fans vertically or laterally as a whole, the height and width dimensions of the cooling equipment are reduced, making the structure of the cooling equipment more compact and reducing its occupied area.

[0022] Preferably, the inner frame includes a first inner frame and a second inner frame connected up and down.

[0023] The second supply and return air fan is vertically arranged on the second inner frame.

[0024] The first supply and return air fan is laterally arranged on the first inner frame.

[0025] The intake and exhaust fan assembly includes a plurality of intake and exhaust fans that are laterally arranged in the same plane along the length direction of the air-air heat exchanger on the second inner frame, and their air suction ports are arranged facing the outdoor exhaust port.

[0026] As described above, the inner frame is divided into upper and lower sections. The first supply and return air fan is laterally arranged in the same plane along the length direction of the air-air heat exchanger on the first inner frame, and the others are arranged on the second inner frame. When the height of the device is extremely high, dividing it into two sections facilitates handling; in addition, laterally arranging the first supply and return air fan in the same plane along the length direction of the air-air heat exchanger also reduces the dimension in the direction perpendicular to the length direction of the air-air heat exchanger.

[0027] Preferably, the housing includes an outer frame that houses the inner frame and a combined foaming panel arranged on the outer frame.

[0028] The combined foaming panel includes a U-shaped first thin plate, a heat insulation material arranged on the first thin plate, a second thin plate arranged on the upper part of the heat insulation material and sealing it inside the first thin plate, and a border thin plate that integrally connects the edges of the first thin plate and the second thin plate.

[0029] Preferably, the cross-section of the border thin plate is a U-shaped groove with an opening facing the edges of the first thin plate and the second thin plate.

[0030] As described above, the cross-section of the border thin plate is U-shaped. In this way, the border thin plate is clamped on the edges of the first and second thin plates and bonded to them to form a whole with the first and second thin plates and the heat insulation material arranged inside the first thin plate, which is convenient for heat insulation. Brief Description of the Drawings

[0031] Figure 1 It is a three-dimensional view of an indirect evaporative cooling device;

[0032] Figure 2 It is Figure 1 a side view of the first part of the indirect evaporative cooling device shown;

[0033] Figure 3 It is Figure 1 a three-dimensional view of the first part of the indirect evaporative cooling device shown;

[0034] Figure 4 It is Figure 1 a side view of the second part of the indirect evaporative cooling device shown;

[0035] Figure 5 For Figure 1 The three-dimensional view of the second part of the indirect evaporative cooling device shown;

[0036] Figure 6 For Figure 1 The three-dimensional view of the spray pipe assembly and the spray pipe assembly of the indirect evaporative cooling device shown;

[0037] Figure 7 For Figure 1 The three-dimensional view of the outer shell of the indirect evaporative cooling device shown;

[0038] Figure 8 For Figure 1 The front view of the combined foam panel on the outer shell of the indirect evaporative cooling device shown;

[0039] Figure 9 For Figure 1 The side view of the combined foam panel on the outer shell of the indirect evaporative cooling device shown;

[0040] Figure 10 For Figure 1 The structural schematic diagram of the combined foam panel on the outer shell of the indirect evaporative cooling device shown;

[0041] Figure 11 For Figure 1 The installation schematic diagram of the thermal insulation material between the inner and outer frames of the indirect evaporative cooling device shown.

[0042] Description of Reference Numerals

[0043] 1 Wind circulation system;

[0044] 11 Supply and return air fan assembly, 12 Air-air heat exchange, 13 Supply and exhaust air fan assembly;

[0045] 111 First supply and return air fan, 112 Second supply and return air fan;

[0046] 2 Inner frame, 21 First inner frame, 22 Second inner frame;

[0047] 3 Spray system;

[0048] 31 High-pressure pump, 32 Pipeline assembly, 33 Spray assembly;

[0049] 331 Spray water delivery pipe, 332 Spray pipe;

[0050] 4 Spray system;

[0051] 41 Circulation pump assembly, 42 Spray assembly, 43 Water tray;

[0052] 411 Circulation pump, 412 Water level switch;

[0053] 421 Spray water delivery pipe, 422 spray pipe;

[0054] 5 Compression refrigeration system, 51 compressor, 52 evaporator, 53 condenser;

[0055] 6 Shell, 61 outer frame, 62 combined foam panel, 63 door lock component, 64 thermal insulation material;

[0056] 621 First thin plate, 622 second thin plate, 623 heat insulation material, 624 U-shaped edge wrapping thin plate;

[0057] 7 Electric control box. Detailed implementation mode

[0058] As Figures 1 to 5 shown, an indirect evaporative cooling device includes an air circulation system 1 and an inner frame 2 that supports the air circulation system 1. For the convenience of installation and transportation, the cooling device can be divided into two upper and lower connected parts, that is, the inner frame 2 includes a first inner frame 21 and a second inner frame 22. The first and second inner frames 21, 22 carry the entire cooling device, which is welded by stainless steel profiles and stainless steel plates, with a firm structure and not easily deformed.

[0059] The air circulation system 1 includes a supply and return air fan assembly 11, an air-to-air heat exchanger 12, and an intake and exhaust air fan assembly 13.

[0060] As Figure 1 shown, the air-to-air heat exchanger 12 is a rectangular cube structure, which is arranged on the bottom plate of the second inner frame 22 after being inclined 45 degrees along its length direction relative to the bottom of the second inner frame 22. An outdoor exhaust air outlet and an outdoor intake air inlet are respectively arranged on the left and right opposite surfaces along its length direction, and a return air intake and a return air exhaust outlet are respectively arranged on the upper and lower opposite surfaces along its length direction. The supply and return air fan assembly 11 and the intake and exhaust air fan assembly 13 are respectively arranged on the return air intake side and the outdoor air outlet side of the air-to-air heat exchanger 12.

[0061] The supply and return air fan assembly 11 includes three first supply and return air fans 111 arranged laterally along the length direction of the air-to-air heat exchanger 12 on the first inner frame 21 and three second supply and return air fans 112 arranged vertically along the length direction of the air-to-air heat exchanger 12 on the second inner frame 22. In this way, the central axes of the first and second supply and return air fans 111, 112 are perpendicular to each other, and their air inlets are also adjacent; that is, the air inlet of the second supply and return air fan 112 is arranged upward, and its air outlet is arranged downward on the return air intake side of the air-to-air heat exchanger 12; From Figure 1From the shown direction, the air inlet of the first supply and return air fan 111 can be arranged on the left or right side of the air inlet of the second supply and return air fan 112. In this embodiment, as Figure 1 shown, the air inlet of the first supply and return air fan 111 is arranged on the left side of the air inlet of the second supply and return air fan 112. In this way, the second supply and return air fan 112 sends the high-temperature return air (hereinafter referred to as indoor return air) in the data center from top to bottom into the air-air heat exchanger 12, and the first supply and return air fan 111 sucks the indoor return air from right to left. Since the rear part of the air outlet of the first supply and return air fan 111 is blocked, the indoor return air discharged from the air outlet of the first supply and return air fan 111 is also sent into the air-air heat exchanger 12. Then, the indoor return air sent into the air-air heat exchanger 12 exchanges heat with the outdoor cold air described later and is discharged from the return air outlet of the air-air heat exchanger 12 opposite to the second supply and return air fan 112.

[0062] The central axes of the first and second supply and return air fans 111 and 112 are vertically arranged. That is, in the narrow air inlet channel, the second supply and return air fan 112 is vertically arranged, and the first supply and return air fan 111 is laterally arranged in an L-shaped layout. Compared with the case where all the supply and return air fans are vertically arranged or all are laterally arranged, the occupied space of the supply and return air fans is reduced, which not only reduces the width of the cooling equipment but also reduces its height, making the structure of the cooling equipment more compact. At the same time, the mutual interference generated when multiple supply and return air fans are placed side by side is weakened, and the fan efficiency is improved.

[0063] Filters 14 are also arranged in the air inlet channels of the first and second supply and return air fans 111 and 112, as Figure 2 and Figure 3 shown, for filtering the indoor return air before sending it into the air-air heat exchanger 12 to purify the indoor air.

[0064] The air inlet and outlet fan assembly 13 includes a total of 6 air inlet and outlet fans arranged in two rows, upper and lower, along the length direction of the air-air heat exchanger 12 on the same vertical plate of the second inner frame 22 on the outdoor air outlet side of the air-air heat exchanger 12. This arrangement makes full use of the limited space inside the cooling equipment and reduces the dimension of the cooling equipment perpendicular to the length direction of the air-air heat exchanger 12. The air inlet and outlet fan assembly 13 introduces the low-temperature air outside the data center (hereinafter referred to as outdoor low-temperature air) into the air-air heat exchanger 12 through the outdoor air inlet of the air-air heat exchanger 12 opposite to the air inlet and outlet fans. In the air-air heat exchanger 12, the outdoor low-temperature air exchanges heat with the indoor return air and is discharged outdoors through the outdoor air outlet of the air-air heat exchanger 12.

[0065] Fan cycle temperature control

[0066] When the air temperature and humidity outside the data center meet the set requirements, the supply and return air fan assembly 11 and the intake and exhaust air fan assembly 13 operate at the rated speed. The outdoor low-temperature air is introduced into the air-to-air heat exchanger 12 through the intake and exhaust air fan assembly 13, and the indoor return air is introduced into the air-to-air heat exchanger 12 through the supply and return air fan assembly 11. In the air-to-air heat exchanger 12, after the outdoor low-temperature air exchanges heat with the indoor return air, they are respectively discharged into the room from the return air outlet of the air-to-air heat exchanger 12 and discharged to the outside through the outdoor outlet of the air-to-air heat exchanger 12. By relying on the heat exchange between the outdoor low-temperature air and the return air flow in the data center, the cold quantity of the natural cold source outdoors is introduced into the room through heat exchange, achieving the effect of controlling the temperature in the data center only by operating the supply and return air fans and the intake and exhaust air fans, which is energy-saving and does not introduce fresh air, and has no impact on the cleanliness of the indoor environment.

[0067] Fan circulation + spray system temperature control

[0068] When the outdoor ambient dry-bulb temperature rises and relying solely on the operation of the fans cannot meet the temperature control effect, the spray system 3 needs to be added to the operation. Therefore, this indirect evaporative cooling device also includes a spray system 3 that is detachably fixed on the second inner frame 22 at the outdoor air inlet of the air-to-air heat exchanger 12 opposite to the intake and exhaust air fan assembly 13. The spray system 3 includes a high-pressure pump 31 arranged on the bottom plate of the second inner frame 22 for boosting low-pressure water into high-pressure water, a pipeline assembly 32 including a water inlet pipeline and a water supply pipeline, and a spray assembly 33 arranged at the outdoor air inlet of the air-to-air heat exchanger 12 for spraying high-pressure water to form a mist. As Figure 6 shown, the spray assembly 33 includes a spray water delivery pipe 331 connected to the water supply pipeline and a plurality of parallel spray pipes 332 connected to the spray water delivery pipe 331 through joints. Each spray pipe 332 is provided with a plurality of small spray holes at intervals. The plurality of spray pipes 332 are arranged parallel to each other at intervals up and down on the spray rack 333, and the spray rack 333 is fixed on the second inner frame 22.

[0069] When the spray system 3 needs to spray, the high-pressure pump 31 starts to work. The high-pressure pump 31 introduces the external water source through the water inlet pipeline, raises the water pressure, and then sends it into the spray pipe 332 through the water supply pipeline, and then sprays it out rapidly from the smaller spray holes on it to form a conical fine water mist. The water mist is introduced into the air-to-air heat exchanger 12 through the intake and exhaust air fan assembly 13 and quickly evaporates and absorbs heat to achieve refrigeration, and exchanges heat with the indoor return air introduced by the supply and return air fan assembly 11 in the air-to-air heat exchanger 12 to achieve refrigeration.

[0070] According to different refrigeration requirements, the high-pressure pump 31 adjusts its speed through a frequency converter (not shown) to adjust the water pressure and flow rate, and then adjusts the spray evaporation amount to achieve better energy-saving effects.

[0071] Fan circulation + spray system + spray system temperature control

[0072] Furthermore, when the wet-bulb temperature of the outdoor environment rises and the temperature control requirements cannot be met after the fan circulation and micro-mist are heat-exchanged through the air-air heat exchanger 12, it is necessary to add a spray system 4 to the spray system 3. The spray system 4 includes a circulation pump assembly 41 arranged on the bottom plate of the second inner frame 22, a spray assembly 42 arranged on the spray rack 333, a water inlet solenoid valve (not shown), and a water tray 43 arranged below the circulation pump assembly 41.

[0073] The spray assembly 42 includes a plurality of corresponding spray water delivery pipes 421 and spray pipes 422. Each spray water delivery pipe 421 is connected to the water delivery pipeline 322. The spray water delivery pipe 421 is connected to the end of the spray pipe 422 through a joint. A plurality of spray pipes 422 are horizontally arranged in parallel on the spray rack 333, and each spray pipe 422 is provided with a plurality of spray holes larger than the spray holes.

[0074] At this time, while the spray system 3 is working, the water inlet solenoid valve is opened, and the outside water enters the water tray 43 arranged below the circulation pump 411 through the water inlet pipeline 321. The water level height in the water tray 43 is controlled by a water level switch 412. When the water level height reaches the starting height of the circulation pump 411, the circulation pump 411 is started. The water pumped out by the circulation pump 411 is transported through the pipeline to the spray pipe 422, and is sucked into the air-air heat exchanger 12 through the spray holes on the spray pipe 422 by the exhaust fan assembly 13. A small part of the water is evaporated to absorb the heat of the return air introduced by the return air fan assembly, and most of it exchanges heat with the high-temperature return air through the lower water temperature to achieve cooling in the data center.

[0075] The circulation pump 411 adopts a waterproof water pump and is placed in the water tray 43, eliminating the need to separately set up an installation space for the circulation pump 411, simplifying the water pipe connection, improving the space utilization rate inside the cooling equipment, and reducing the size of the cooling equipment.

[0076] Compressor refrigeration temperature control or fan circulation + spray system + spray system + compressor refrigeration temperature control

[0077] When the fan circulation, spray system, and sprinkler system cannot work or even when all of them work together, they still cannot achieve the temperature control inside the data center, it is necessary to start the traditional refrigeration mode. Therefore, this indirect evaporative cooling device further includes a compression refrigeration system 5, which includes a compressor 51 arranged on the bottom plate of the second inner frame 22, an evaporator 52 arranged on the air return air outlet side of the air-to-air heat exchanger 12, a condenser 53 arranged on the outdoor air outlet side of the air-to-air heat exchanger 12, and related refrigeration components. Since the air-to-air heat exchanger 12 is installed on the bottom plate of the second inner frame 22 in a tilted 45° manner when viewed from its length direction, this setting enables the evaporator 52, condenser 53, spray pipe 332, and sprinkler pipe 422 to be closely installed on the second inner frame 22 against the surface of the air-to-air heat exchanger 12. Among them, both the evaporator 52 and the condenser 53 are closely attached to the air outlet to reduce the installation space, and at the same time make the surface wind speed of the evaporator 52 and the condenser 53 more uniform, improving the heat exchange efficiency. This setting makes full use of the internal structural space, making the cooling device compact in structure.

[0078] When the compression refrigeration system is needed, the indoor high-temperature air extracted by the supply and return air fans passes through the evaporator 52 through the pipeline to absorb heat, cooling the air at the air return air outlet of the air-to-air heat exchanger 12 and then sending it back into the room through this air return air outlet. The intake and exhaust air fans extract the outdoor low-temperature air into the air-to-air heat exchanger 12, send it through the pipeline to the condenser 53 arranged at the outdoor air outlet of the air-to-air heat exchanger 12 to release heat, and then discharge it outdoors through this outdoor air outlet. This setting can achieve both separate fan circulation refrigeration and separate compression refrigeration or a combination of compression refrigeration and any other energy-saving refrigeration method through the air-to-air heat exchanger 12. At the same time, it makes the overall structural layout of the cooling device compact, reduces the overall size of the cooling device, and thus facilitates handling and reduces its occupied area.

[0079] As Figure 7 shown, the cooling device is arranged in a square housing 6, which includes an outer frame 61 processed from aluminum profiles and a combined foaming panel 62 installed on the outer frame 61 and processed and combined from aluminum plates, PVC plates, and PVC profiles. Among them, the foaming panel 62 that does not need to be opened is riveted to the outer frame 61 from the inside. It has the advantages of novel appearance, good sealing performance, no exposed screws, and anti-cold bridge.

[0080] Door lock components 63 are installed on the combined foaming panel 62 outside the parts that need to be repaired, such as the intake and exhaust air fans, supply and return air fans, high-pressure pump 31, circulation pump 411, etc. As Figure 8 and Figure 9As shown, the combined foam panel 62 can be opened quickly and conveniently with a special key to inspect and repair the parts without removing the screws. At the same time, it prevents outdoor unauthorized personnel from using common tools such as screwdrivers to open the door panel of the cooling device.

[0081] like Figure 10 As shown, the combined foam panel 62 includes a U-shaped first thin plate 621 made of aluminum plate, a foaming agent as a kind of heat insulating material 623 is arranged in the first thin plate 621, and a second thin plate 622 made of PVC plate is arranged on the upper part of the heat insulating material 623 and sealed in the space formed by the first and second thin plates 621, 622. The edge of the combined foam panel 62 is provided with a U-shaped edging thin plate 624 of PVC profile, which wraps the first and second thin plates 621 and the heat insulating material 623 into a whole. A plurality of dedicated door lock components 63 are arranged on the combined foam panel 62, which are used to open the movable combined foam panel to facilitate the maintenance of the inspection parts.

[0082] An external electric control box 7 is also provided on the outer side of the square housing 6, so that the inside of the electric control box can be inspected and operated without opening the door panel of the cooling device.

[0083] like Figure 11 As shown, an outer frame 61 made of aluminum alloy profile is arranged on the outer side of the inner frame 2, and flexible insulation material 64 is installed between the inner frame 2 and the outer frame 61 and in the inner hole of the outer frame 61 profile, so that the inner and outer frames 2, 61 are tightly sealed.

[0084] In the above embodiment, the structure is installed in two sections, mainly for the convenience of transportation and handling. When there are not so many air inlet and exhaust fans and return air fans, the inner frame 2 can be designed as a whole.

[0085] Among the above fan circulation, spray system, sprinkler system and compressor refrigeration temperature control, any compressor refrigeration in realizing the refrigeration function is a permanent refrigeration mode, which is used when any of the following energy-saving modes cannot make the temperature in the data center reach the set temperature. The energy-saving modes include any one of fan circulation, fan circulation + spray system, fan circulation + spray system + sprinkler system or fan circulation + sprinkler system.

[0086] This cooling equipment can not only control the temperature in data centers where a large number of machines and equipment are running, but also control the temperature of any other indoor environment that requires temperature control.

[0087] The present invention provides an indirect evaporative cooling device that is structurally compact and energy-saving. A segmented structural design is adopted to solve the problem that in some cases, the installation and transportation of the cooling device are inconvenient due to the excessive height and weight caused by the large number of inlet and outlet air fans and supply and return air fans. The air-air heat exchanger 12 of the cooling device is installed on the second inner frame 22 after being circumferentially rotated 45 degrees along its length direction, so that the spray pipe 332, the spray pipe 422, the evaporator 52, and the condenser 53 can be sequentially arranged close to the outdoor air inlet, the return air outlet, and the outdoor air outlet along the length direction of the air-air heat exchanger 12. This arrangement makes the cooling device compact and reduces the length and height of the cooling device. The second supply and return air fan is vertically arranged, and the first supply and return air fan is laterally arranged, and the centerlines of the two are perpendicular. When multiple first and second supply and return air fans are set, compared with setting all the first and second supply and return air fans vertically or all laterally, the size of the cooling device is reduced.

[0088] In terms of energy conservation, a refrigeration method for temperature control is adopted, which uses the traditional compression refrigeration mode as a supplement and operates in any one of the energy-saving modes of fan circulation, fan circulation + spray system, fan circulation + spray system + spray system, or fan circulation + spray system. The pPUE of the data center adopting this refrigeration solution is about 1.2 - 1.3.

[0089] The structure of a double-layer inner frame is adopted to improve the problem that the strength of the ordinary assembled inner frame structure is insufficient and it is easy to deform when the size is large. The internal structure layout is compact and flexible, solving the problems of large external dimensions, inconvenient production, transportation and installation, and high cost of similar products. The external panel adopts the form of aluminum alloy, PVC profile + aluminum plate, and PVC board combined with foam, improving the appearance quality, sealing, and heat preservation effect of the ordinary sheet metal processing panel, and canceling the exposed screws to prevent the generation of cold bridges. The outside of the components that need to be maintained inside the unit adopts a quick-release panel to improve the work efficiency of maintenance and repair.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An indirect evaporative cooling device, comprising a housing (6), an air circulation system (1) located in the housing (6) and an inner frame (2) supporting the housing (6), the air circulation system (1) comprising an air-to-air heat exchanger (12), a supply-return air fan assembly (11) arranged at a return air inlet of the air-to-air heat exchanger (12) and introducing indoor return air into the air-to-air heat exchanger (12) through the return air inlet, exchanging heat with outdoor cold air introduced therein, and then discharging the returned air back into the room through a return air outlet, and an air supply-exhaust fan assembly (13) arranged at an outdoor air outlet of the air-to-air heat exchanger (12) and introducing outdoor cold air into the air-to-air heat exchanger (12) through the outdoor air inlet, exchanging heat with the indoor return air introduced therein, and then discharging the returned air back into the room through a return air outlet, wherein the air supply-exhaust fan assembly (13) is arranged at an outdoor air outlet of the air-to-air heat exchanger (12) and introducing outdoor cold air into the air-to-air heat exchanger (12) through the outdoor air inlet, exchanging heat with the indoor return air introduced therein, and then discharging the returned air back into the room through the outdoor air outlet, wherein the air supply-exhaust fan assembly (13) is characterized in that: It also includes a spray system (3) arranged on the inner frame (2), the spray system (3) including a plurality of spray pipes (332) arranged at the outdoor air inlet of the air-air heat exchanger (12) and transporting high-pressure water therein through pipelines, each of the spray pipes (332) being provided with a plurality of spray holes arranged in the outdoor air inlet of the air-air heat exchanger (12) and capable of spraying the high-pressure water into mist; It also includes a spray system (4) arranged on the inner frame (2), the spray system (4) including a plurality of spray pipes (422) arranged on the outdoor air inlet side of the air-air heat exchanger (12) and transporting water therein through pipelines, the spray pipes (422) being provided with a plurality of spray holes arranged in the outdoor air inlet of the air-air heat exchanger (12) for spraying water to form water droplets, the aperture of the spray hole being larger than the aperture of the spray hole; When the outdoor dry-bulb temperature rises and the air circulation system (1) alone cannot meet the temperature control effect, the spray system (3) needs to be put into operation. When the outdoor wet-bulb temperature rises and the air circulation system (1) with the spray system (3) added to the operation cannot meet the temperature control requirements, it is necessary to add a spray system (4) to the spray system (3).

2. The indirect evaporative cooling device according to claim 1, wherein The spray system (3) further comprises a high-pressure pump (311) for increasing the pressure of a water source to convert it into the high-pressure water, and the high-pressure pump (311) is connected to the spray pipe (332) via a pipeline.

3. The indirect evaporative cooling device according to claim 1, wherein The spray system (4) further comprises a water tray (43) connected to a water source, and a circulation pump (411) for extracting water from the water tray (43) for circulation, wherein the circulation pump (411) is connected to the spray pipe (422) via a pipeline.

4. The indirect evaporative cooling device according to claim 1, characterized in that, The spray pipe (332) and the shower pipe (422) are arranged in parallel on the spray rack (333).

5. The indirect evaporative cooling device according to claim 1, wherein It also includes a compressor refrigeration system (5), wherein the compressor refrigeration system (5) includes an evaporator (52) and a condenser (53). The air-to-air heat exchanger (12) is arranged on the inner frame (2) along its length direction at an angle of 45 degrees relative to the bottom circumference of the inner frame (2). The evaporator (52) is arranged at the return air outlet of the air-air heat exchanger (12) and is detachably fixed on the inner frame (2), and the condenser (53) is arranged at the outdoor air outlet of the air-air heat exchanger (12) and is detachably fixed on the inner frame (2).

6. The indirect evaporative cooling device according to claim 1, wherein the supply and return air fan assembly (11) includes a second supply and return air fan (112) whose air outlet faces the return air inlet and is arranged along the length direction of the air-air heat exchanger (12), and a first supply and return air fan (111) whose air suction port is adjacent to the air suction port of the second supply and return air fan (112) and the center lines of the two are perpendicular to each other.

7. The indirect evaporative cooling device according to claim 6, wherein the inner frame (2) includes a first inner frame (21) and a second inner frame (22) connected up and down the second supply and return air fan (112) is vertically arranged on the second inner frame (22) the first supply and return air fan (111) is laterally arranged on the first inner frame (21) the air inlet and outlet fan assembly (13) includes a plurality of air inlet and outlet fans (131) arranged on the second inner frame (22) laterally along the length direction of the air-air heat exchanger (12) in the same plane and whose air suction ports face the outdoor air outlet.

8. The indirect evaporative cooling device according to claim 1, characterized in that The housing (6) includes an outer frame (61) for accommodating the inner frame (2) and a combined foam panel (62) arranged on the outer frame (61). The combined foam panel (62) includes a U-shaped first thin plate (621), a heat insulation material (623) arranged in the first thin plate (621), a second thin plate (622) arranged on the upper part of the heat insulation material (623) and sealing it in the first thin plate (621), and a edge-sealing thin plate (624) for integrally connecting the edges of the first thin plate (621) and the second thin plate (622).

9. The indirect evaporative cooling device according to claim 8, wherein The cross section of the edge-sealing thin plate (624) is a U-shaped groove with an opening facing the edges of the first thin plate (621) and the second thin plate (622).

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