An indirect evaporative cooling device

Abstract

The present invention discloses an indirect evaporative cooling device, comprising a housing, an air circulation system located in the housing, a compressor refrigeration system and an inner frame supporting the two, wherein the air circulation system comprises an air-to-air heat exchanger, a return air blower assembly arranged on the return air inlet side of the air-to-air heat exchanger, and an inlet and exhaust air blower assembly arranged on the outdoor air outlet side of the air-to-air heat exchanger, wherein the compressor refrigeration system comprises an evaporator and a condenser, wherein the air-to-air heat exchanger is arranged on the inner frame at an angle of 45 degrees relative to the bottom of the inner frame along its length direction, wherein the evaporator is arranged at the return air outlet of the air-to-air heat exchanger and is detachably fixed on the inner frame, and wherein the condenser is arranged at the outdoor air outlet of the air-to-air heat exchanger and is detachably fixed on the inner frame. The cooling device has a compact structure and a small outer size, and is convenient for transportation and installation.

Description

Technical Field

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

[0002] The indirect evaporative cooling equipment currently used in the market has rich functions, large cooling capacity requirements, and many internal components, resulting in complex structure, large dimensions, and heavy weight, which brings difficulties to production, transportation, and installation; large-sized cooling equipment is also easy to deform during transportation and installation, affecting the installation quality and, in severe cases, affecting the reliability of product operation; more importantly, due to its large dimensions, it takes up a large space to place. Summary of the invention

[0003] In view of this, the main purpose of the present invention is to provide an indirect evaporative cooling device with a compact structure to reduce its overall size and facilitate production, transportation and installation.

[0004] The invention discloses an indirect evaporative cooling device, comprising a housing, a wind circulation system located in the housing, a compressor refrigeration system and an inner frame supporting the two.

[0005] The air circulation system includes an air-to-air heat exchanger, a return air blower assembly arranged at the return air inlet side of the air-to-air heat exchanger, which introduces indoor return air into the air-to-air heat exchanger through the return air inlet, exchanges heat with the outdoor cold air introduced therein, and then discharges it back to the room through the return air outlet, and an air inlet and exhaust blower assembly arranged at the outdoor air outlet side of the air-to-air heat exchanger, which introduces the outdoor cold air into the air-to-air heat exchanger through the outdoor air inlet, exchanges heat with the indoor return air introduced therein, and then discharges it to the room through the outdoor air outlet.

[0006] The compressor refrigeration system comprises an evaporator, a condenser and a compressor, and the air-to-air heat exchanger is arranged on the inner frame along its length direction and is inclined relative to the bottom circumference of the inner frame.

[0007] The evaporator is flat as a whole, and is arranged at the return air outlet of the air-to-air heat exchanger and is fixed on the inner frame from the bottom to the top. The compressor is arranged below the inner frame. The condenser is flat as a whole, and is arranged at the outdoor air outlet of the air-to-air heat exchanger and is fixed on the inner frame from the bottom to the top. The evaporator and condenser are arranged in a V shape as a whole.

[0008] From the above, the air-to-air heat exchanger is arranged on the inner frame along its length direction and is inclined relative to the bottom circumference of the inner frame. The evaporator is arranged at the return air outlet of the air-to-air heat exchanger, and the condenser is arranged at the outdoor air inlet of the air-to-air heat exchanger. When the compressor refrigeration system is not needed, only the air circulation system is used to achieve refrigeration. The return air fan draws the indoor high-temperature air into the air-to-air heat exchanger, and after the heat exchange and cooling by the heat exchange element therein, the air is sent into the room through the return air outlet of the air-to-air heat exchanger. The intake and exhaust air fans draw the outdoor cold air through the outdoor air inlet of the air-to-air heat exchanger, and send it into the air-to-air heat exchanger through the heat exchange and heating by the heat exchange element, and then the air is discharged to the outside through the outdoor air outlet of the air-to-air heat exchanger, so as to achieve indoor air Temperature control function; when a compressor refrigeration system is needed, the indoor high-temperature air extracted by the return air fan passes through the evaporator through the pipeline to absorb heat, so that the air at the return air outlet of the air-to-air heat exchanger is cooled and then sent back to the room through the return air outlet. The air inlet and outlet fans draw outdoor low-temperature air into the air-to-air heat exchanger, and are sent through the pipeline to the condenser set at the outdoor outlet of the air-to-air heat exchanger to release heat, and then are discharged to the outside through the outdoor outlet. This arrangement can realize separate fan circulation refrigeration, separate compressor refrigeration or compressor refrigeration + fan circulation refrigeration through the air-to-air heat exchanger, and at the same time make the entire cooling equipment structure compact, reduce the overall size of the cooling equipment, thereby facilitating transportation and reducing its occupied area.

[0009] Preferably, the supply-return air fan assembly includes a second supply-return air fan whose exhaust port is directed toward the return air inlet and is arranged along the length direction of the air-to-air heat exchanger, and a first supply-return air fan whose suction port is adjacent to the suction port of the second supply-return air fan and whose center lines are perpendicular.

[0010] As shown above, when there are two or more supply and return air fans, some are placed vertically and the other parts are placed laterally. In this way, the center lines of the first and second supply and return air fans are arranged vertically. Compared with the arrangement of placing the supply and return air fans as a whole vertically or as a whole laterally, the height and width dimensions of the cooling device are reduced, making the cooling device structure more compact and reducing its occupied area.

[0011] Preferably, the inner frame includes a first inner frame and a second inner frame connected vertically.

[0012] The second supply and return air fan is vertically arranged on the second inner frame.

[0013] The first return air fan is laterally arranged on the first inner frame.

[0014] The air intake and exhaust fan assembly includes a plurality of air intake and exhaust fans arranged on the second inner frame in the same plane along the length direction of the air-to-air heat exchanger and with the air intake facing the air exhaust port of the air-to-air heat exchanger.

[0015] The compressor refrigeration system is detachably fixed on the second inner frame.

[0016] From the above, the inner frame is divided into two sections, the first supply and return air fan is arranged on the first inner frame laterally along the length direction of the air-to-air heat exchanger in the same plane, and the others are arranged on the second inner frame. When the height of the equipment is too high, it is divided into two sections for easy transportation; in addition, the first supply and return air fan is arranged on the same plane laterally along the length direction of the air-to-air heat exchanger, which also reduces the size in the direction perpendicular to the length direction of the air-to-air heat exchanger.

[0017] Preferably, the air-to-air heat exchanger is arranged on the inner frame along its length direction at an angle of 45 degrees relative to the bottom circumference of the inner frame.

[0018] From above, the effect is best when the tilt angle is 45 degrees.

[0019] Preferably, the outer shell includes an outer frame accommodating the inner frame and a combined foam panel arranged on the outer frame.

[0020] The combined foam panel includes a U-shaped first thin plate, a heat insulating material arranged in the first thin plate, a second thin plate arranged on the upper part of the heat insulating material and sealed in the first thin plate, and an edge-wrapping thin plate that connects the first thin plate and the second thin plate together along their edges.

[0021] Preferably, it also includes a spray system arranged on the inner frame, the spray system includes a plurality of spray tubes arranged at the outdoor air inlet of the air-to-air heat exchanger and conveying high-pressure water therein through pipes, each of the spray tubes is provided with a plurality of spray holes that can spray the high-pressure water into water mist, the air intake and exhaust fan assembly introduces outdoor cold air and the water mist formed at the outdoor air inlet into the air-to-air heat exchanger through the outdoor air inlet, and the supply and return air fan assembly introduces indoor return air into the air-to-air heat exchanger through the return air inlet for heat exchange so as to reduce the indoor temperature.

[0022] As described above, a spray system is provided, and a spray is formed at the outdoor air inlet of the air-to-air heat exchanger through a spray pipe to reduce the air temperature at the outdoor air inlet, and then the air is introduced into the air-to-air heat exchanger through an air intake and exhaust fan for heat exchange with the indoor return air introduced into the air-to-air heat exchanger, thereby reducing the temperature of the indoor return air and lowering the temperature of the air returning to the room. The method of controlling the indoor air temperature by natural cooling is more energy-saving.

[0023] Preferably, the spray system further comprises a high-pressure pump for increasing the pressure of a water source to convert it into the high-pressure water, and the high-pressure pump is connected to the spray pipe via a pipeline.

[0024] Preferably, it also includes a spray system arranged on the inner frame, the spray system includes a plurality of spray pipes arranged at the outdoor air inlet of the air-to-air heat exchanger for transporting water therein through pipes, the spray pipes are provided with a plurality of spray holes for spraying water, the spray holes are larger than the aperture of the spray holes, the air inlet and exhaust fan assembly introduces 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, and the supply and return air fan assembly introduces indoor return air into the air-to-air heat exchanger through the return air inlet for heat exchange so as to reduce the indoor temperature.

[0025] As described above, multiple spray pipes are arranged at the outdoor air inlet of the air-to-air heat exchanger, and water is sprayed through the spray pipes, enters the air-to-air heat exchanger through the outdoor air inlet of the air-to-air heat exchanger, exchanges heat with the indoor return air introduced therein, reduces the temperature of the indoor return air, and reduces the temperature of the air returned to the room. The method of controlling the indoor air temperature by natural cooling is more energy-saving.

[0026] Preferably, the spray system further comprises a water tray connected to a water source, and a circulation pump for drawing water from the water tray for circulation, wherein the circulation pump is connected to the spray pipe via a pipeline.

[0027] Preferably, the spray pipe and the shower pipe are arranged in parallel on a spray rack connected to the inner frame.

[0028] As described above, the spray pipe and the shower pipe are both arranged on the same spray rack, and there is no need to arrange an additional bracket to support the shower pipe, so that the space is fully utilized to make the structure compact and reduce the overall size of the cooling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A three-dimensional diagram of an indirect evaporative cooling device;

[0030] Figure 2 for Figure 1 A side view of a first portion of an indirect evaporative cooling apparatus is shown;

[0031] Figure 3 for Figure 1 A three-dimensional diagram of a first portion of an indirect evaporative cooling apparatus is shown;

[0032] Figure 4 for Figure 1 A side view of a second portion of the indirect evaporative cooling apparatus is shown;

[0033] Figure 5 for Figure 1 A three-dimensional diagram of the second portion of the indirect evaporative cooling apparatus shown;

[0034] Figure 6 for Figure 1 A three-dimensional diagram of the spray pipe assembly and the shower pipe assembly of the indirect evaporative cooling device shown;

[0035] Figure 7 for Figure 1 A three-dimensional diagram of the housing of the indirect evaporative cooling device shown;

[0036] Figure 8 for Figure 1 A front view of a composite foam panel on a housing of an indirect evaporative cooling device is shown;

[0037] Fig. 9 for Figure 1 A side view of a composite foam panel on a housing of an indirect evaporative cooling device is shown;

[0038] Fig.10 for Figure 1 A schematic diagram of the structure of a combined foam panel on a housing of an indirect evaporative cooling device shown;

[0039] Fig.11 for Figure 1 Schematic diagram of the installation of insulation material between inner and outer frames of an indirect evaporative cooling device is shown.

[0040] Description of Reference Numerals

[0041] 1. Air circulation system;

[0042] 11: return air fan assembly, 12: air-to-air heat exchange, 13: air inlet and exhaust fan assembly;

[0043] 111 a first supply and return air fan, 112 a second supply and return air fan;

[0044] 2 inner frame, 21 first inner frame, 22 second inner frame;

[0045] 3. Spray system;

[0046] 31 high pressure pump, 32 pipeline assembly, 33 spray assembly;

[0047] 331 spray water pipe, 332 spray pipe;

[0048] 4. Sprinkler system;

[0049] 41 circulation pump assembly, 42 spray assembly, 43 water tray;

[0050] 411 circulation pump, 412 water level switch;

[0051] 421 spray water pipe, 422 spray pipe;

[0052] 5 compressor refrigeration system, 51 compressor, 52 evaporator, 53 condenser;

[0053] 6 shell, 61 outer frame, 62 combined foam panel, 63 door lock component, 64 insulation material;

[0054] 621 a first thin plate, 622 a second thin plate, 623 a heat insulating material, 624 a U-shaped edge-binding thin plate;

[0055] 7Electrical control box. DETAILED DESCRIPTION

[0056] like Figures 1 to 5 As shown, an indirect evaporative cooling device includes an air circulation system 1 and an inner frame 2 supporting the air circulation system 1. For the convenience of installation and transportation, the cooling device can be divided into two parts connected to each other, 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 and 22 carry the entire cooling device and are welded from stainless steel profiles and stainless steel plates, with a firm structure and not easily deformed.

[0057] 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 .

[0058] like Figure 1 As 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 port and an outdoor air inlet are respectively arranged on the left and right opposite surfaces along its length direction, and a return air inlet and a return air exhaust port 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 inlet side and the outdoor air outlet side of the air-to-air heat exchanger 12.

[0059] The return air fan assembly 11 includes three first return air fans 111 arranged on the first inner frame 21 and laterally arranged along the length direction of the air-to-air heat exchanger 12, and three second return air fans 112 arranged on the second inner frame 22 and also vertically arranged along the length direction of the air-to-air heat exchanger 12, so that the central axes of the first and second return air fans 111, 112 are arranged perpendicular to each other, and the air intakes of the two are also adjacent; that is, the air intake of the second return air fan 112 is arranged upward, and its air outlet is arranged downward on the return air inlet side of the air-to-air heat exchanger 12; Figure 1From the direction shown, the air inlet of the first return air blower 111 can be arranged on the left or right side of the air inlet of the second return air blower 112. Figure 1 The air inlet of the first supply-return air fan 111 is arranged on the left side of the air inlet of the second supply-return air fan 112. In this way, the second supply-return air fan 112 sends the high-temperature return air (hereinafter referred to as indoor return air) in the data center to the air-air heat exchanger 12 from top to bottom, and the first supply-return air fan 111 sucks the indoor return air from right to left. Since the rear part of the exhaust port of the first supply-return air fan 111 is blocked, the indoor return air discharged from the exhaust port of the first supply-return air fan 111 is also sent to the air-air heat exchanger 12, and then the indoor return air sent to the air-air heat exchanger 12 exchanges heat with the outdoor cold air described later and is discharged from the return air exhaust port of the air-air heat exchanger 12 opposite to the second supply-return air fan 112.

[0060] The central axes of the first and second return air fans 111, 112 are arranged vertically, that is, the return air fans are arranged in a narrow air inlet channel, the second return air fan 112 is arranged vertically, and the first return air fan 111 is arranged laterally in an L-shaped arrangement. Compared with the return air fans arranged vertically or laterally, the occupied space of the return air fans is reduced, and both the width and height of the cooling device are reduced, making the cooling device structure more compact. At the same time, the mutual interference generated when multiple return air fans are placed in parallel is reduced, and the fan efficiency is improved.

[0061] A filter 14 is also provided in the air suction passage of the first and second return air blowers 111, 112. Figure 2 and Figure 3 As shown, it is used to filter the indoor return air before sending it into the air-to-air heat exchanger 12 so as to purify the indoor air.

[0062] The air inlet and exhaust fan assembly 13 includes two rows of six air inlet and exhaust fans arranged laterally 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 exhaust port side of the air-air heat exchanger 12. This arrangement makes full use of the limited space in the cooling device and reduces the size of the cooling device perpendicular to the length direction of the air-air heat exchanger 12. The air inlet and exhaust fan assembly 13 introduces 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 exhaust fans. After the outdoor low-temperature air exchanges heat with the indoor return air in the air-air heat exchanger 12, it is discharged outdoors through the outdoor exhaust port of the air-air heat exchanger 12.

[0063] Fan circulation temperature control

[0064] When the air temperature and humidity outside the data center meet the set requirements, the return air fan assembly 11 and the intake and exhaust air fan assembly 13 operate at the rated speed. Outdoor low-temperature air is introduced into the air-air heat exchanger 12 through the intake and exhaust air fan assembly 13, and indoor return air is introduced into the air-air heat exchanger 12 through the return air fan assembly 11. In the air-air heat exchanger 12, the outdoor low-temperature air and the indoor return air are exchanged with each other and then discharged to the indoor from the return air outlet of the air-air heat exchanger 12 and to the outdoor through the outdoor air outlet of the air-air heat exchanger 12. The outdoor low-temperature air exchanges heat with the return air flow in the data center, and the coldness of the outdoor natural cold source is introduced into the indoor through heat exchange, so that the temperature in the data center can be controlled by operating the return air fan and the intake and exhaust air fan only, which saves energy and does not introduce fresh air, and has no effect on the cleanliness of the indoor environment.

[0065] Fan circulation + spray system temperature control

[0066] When the dry-bulb temperature of the outdoor environment rises and the temperature control effect cannot be satisfied by relying solely on the fan operation, the spray system 3 needs to be put into operation. Therefore, the indirect evaporative cooling device also includes a spray system 3 detachably fixed on the second inner frame 22 at the outdoor air inlet of the air-to-air heat exchanger 12 opposite to the air inlet and exhaust fan assembly 13. The spray system 3 includes a high-pressure pump 31 arranged on the bottom plate of the second inner frame 22 to boost low-pressure water to high-pressure water, a pipeline assembly 32 including a water inlet pipeline and a water delivery pipeline, and a spray assembly 33 arranged at the outdoor air inlet of the air-to-air heat exchanger 12 to spray high-pressure water to form mist. Figure 6 As shown, the spray assembly 33 includes a spray water pipe 331 connected to the water supply pipeline and a plurality of parallel spray pipes 332 connected to the spray water pipe 331 through a joint, each spray pipe 332 has a plurality of fine spray holes arranged at intervals, and the plurality of spray pipes 332 are arranged in parallel and at intervals up and down on a spray rack 333, and the spray rack 333 is fixed on the second inner frame 22.

[0067] When the spray system 3 needs to spray, the high-pressure pump 31 starts to work. The high-pressure pump 31 introduces external water through the water inlet pipeline, increases the water pressure, and then sends it into the spray pipe 332 through the water supply pipeline, and then sprays it rapidly from the smaller spray hole on it to form a conical fine water mist. After the water mist is introduced into the air-air heat exchanger 12 through the air intake and exhaust fan assembly 13, it quickly evaporates and absorbs heat to achieve refrigeration, and exchanges heat with the indoor return air introduced by the return air fan assembly 11 in the air-air heat exchanger 12 to achieve refrigeration.

[0068] 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 adjust the spray evaporation amount to achieve better energy-saving effect.

[0069] Fan circulation + spray system + spray system temperature control

[0070] Furthermore, when the wet-bulb temperature of the outdoor environment rises and the temperature control requirements cannot be met after the fan circulation and the micro-mist are heat exchanged by the air-to-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 at the lower part of the circulation pump assembly 41.

[0071] The spray assembly 42 includes a plurality of spray water pipes 421 and spray pipes 422 corresponding to each other. Each spray water pipe 421 is connected to the water supply pipeline 322. The spray water pipe 421 is connected to the end of the spray pipe 422 through a joint. The plurality of spray pipes 422 are horizontally and parallelly arranged on the spray rack 333, and each spray pipe 422 is provided with a plurality of spray holes larger than the spray hole.

[0072] At this time, while the spray system 3 is working, the water inlet solenoid valve is opened, and external water enters the water pan 43 arranged at the lower part of the circulation pump 411 through the water inlet pipe 321. The water level in the water pan 43 is controlled by the water level switch 412. When the water level reaches the starting height of the circulation pump 411, the circulation pump 411 is started, and the circulation pump 411 transports the pumped water to the spray pipe 422 through the pipeline. The water is sucked into the air-air heat exchanger 12 from the spray hole on the spray pipe 422 through the exhaust fan assembly 13. A small amount of water is evaporated and absorbs the heat of the return air introduced by the return air fan assembly. Most of the water is exchanged through lower water temperature and high-temperature return air to achieve cooling in the data center.

[0073] The circulation pump 411 is a waterproof water pump and is placed in the water tray 43. There is no need to set up a separate installation space for the circulation pump 411, and the water pipe connection is simplified, thereby improving the space utilization inside the cooling device and reducing the size of the cooling device.

[0074] Compressor refrigeration temperature control or fan circulation + spray system + spray system + compressor refrigeration temperature control

[0075] When the fan cycle, the spray system and the sprinkler system cannot work or all work together and still cannot reach the temperature control in the data center, it is necessary to start the traditional cooling mode, so the indirect evaporative cooling device also includes a compressor 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 return air outlet side of the air-air heat exchanger 12, a condenser 53 arranged on the outdoor outlet side of the air-air heat exchanger 12, and related refrigeration components. Since the air-air heat exchanger 12 is installed on the bottom plate of the second inner frame 22 in a 45° tilted manner from its length direction, this arrangement allows the evaporator 52, the condenser 53, the spray pipe 332 and the sprinkler pipe 422 to be installed on the second inner frame 22 in close contact with the surface of the air-air heat exchanger 12, wherein the evaporator 52 and the condenser 53 are both closely attached to the air outlet to reduce the installation space, and at the same time make the wind speed on the surface of the evaporator 52 and the condenser 53 more uniform, thereby improving the heat exchange efficiency. This arrangement makes full use of the internal structural space to make the cooling device compact.

[0076] When a compressor refrigeration system is needed, the indoor high-temperature air extracted by the return air fan passes through the evaporator 52 through the pipeline to absorb heat, so that the air at the return air outlet of the air-to-air heat exchanger 12 is cooled and then sent back to the room through the return air outlet. The air intake and exhaust fans draw outdoor low-temperature air into the air-to-air heat exchanger 12, and are sent through the pipeline to the condenser 53 set at the outdoor outlet of the air-to-air heat exchanger 12 to release heat and then be discharged to the outside through the outdoor outlet. This arrangement can realize single fan circulation refrigeration through the air-to-air heat exchanger 12, and can also realize single compressor refrigeration or compressor refrigeration and any other energy-saving refrigeration combination mode, while making the entire cooling device structure compact, reducing the overall size of the cooling device, thereby facilitating transportation and reducing its occupied area.

[0077] like Figure 7 As shown, the cooling device is arranged in a square housing 6, which includes an outer frame 61 made of aluminum profiles, and a combined foam panel 62 made of aluminum plates, PVC plates, and PVC profiles and mounted on the outer frame 61. The foam panel 62, which does not need to be opened, is riveted together with the outer frame 61 from the inside. It has the advantages of novel appearance, good sealing, no exposed screws, and anti-cold bridge.

[0078] A door lock component 63 is installed on the outer side of the combined foam panel 62 of the parts that need to be repaired, such as the air inlet and exhaust fan, the return air fan, the high pressure pump 31, the circulation pump 411, etc. Figure 8 and Fig. 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.

[0079] like Fig.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.

[0080] 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.

[0081] like Fig.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.

[0082] 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 frame 2 can be designed as a whole.

[0083] 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.

[0084] 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.

[0085] The present invention provides an indirect evaporative cooling device with a compact structure and energy saving. The structure adopts a segmented structural design to solve the problem of inconvenience in handling and installation caused by the excessive height and weight of the cooling device due to the large number of air inlet and exhaust fans and supply and return air fans in some cases; the air-to-air heat exchanger 12 of the cooling device is rotated 45 degrees in the circumferential direction along its length direction and then installed on the second inner frame 22, so that the spray pipe 332 and the spray pipe 422, the evaporator 52, and the condenser 53 can be arranged in sequence close to the outdoor air inlet, return air outlet and outdoor air outlet of the air-to-air heat exchanger 12 along its length direction. 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 center lines of the two are perpendicular. When multiple first and second supply and return air fans are arranged, the size of the cooling device is reduced compared with setting all the first and second supply and return air fans vertically or laterally.

[0086] Energy saving is achieved by using a cooling method that supplements the traditional compressor cooling mode and controls the temperature by operating in any of the energy-saving modes of fan circulation, fan circulation + spray system, fan circulation + spray system + sprinkler system, or fan circulation + sprinkler system. The pPUE of a data center using this type of cooling solution is about 1.2 to 1.3.

[0087] The double-layer inner frame structure is adopted to improve the problems of insufficient strength of ordinary assembled inner frame structures and easy deformation when the size is large; the internal structure layout is compact and flexible, which solves the problems of large size, inconvenient production, transportation and installation, and high cost of similar products; the external panel adopts the form of aluminum alloy, PVC profile + aluminum plate, PVC plate combined foaming, which improves the appearance quality, sealing and thermal insulation effect of ordinary sheet metal processing panels, and eliminates exposed screws to prevent cold bridges; the outside of the components that need to be maintained inside the unit adopts quick-release panels to improve the efficiency of maintenance and overhaul.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should 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), a compressor refrigeration system (5), and an inner frame (2) supporting the two. The air circulation system (1) comprises an air-to-air heat exchanger (12), a return air blower 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 heat back into the room through a return air outlet, and a return air blower assembly (11) arranged at an outdoor air outlet of the air-to-air heat exchanger (12) and introducing the outdoor cold air into the air-to-air heat exchanger (12) through the outdoor air inlet of the air-to-air heat exchanger (12) and exchanging heat with the outdoor cold air introduced therein. The indoor return air is discharged to the outside through the outdoor exhaust port after heat exchange by the inlet and exhaust fan assembly (13), the supply and return air fan assembly (11) comprises a second supply and return air fan (112) whose exhaust port faces the return air inlet and is arranged along the length direction of the air-to-air heat exchanger (12), and a first supply and return air fan (111) whose air intake port is adjacent to the air intake port of the second supply and return air fan (112) and whose center lines are perpendicular to each other, and the second supply and return air fan (112) is arranged vertically and the first supply and return air fan (111) is arranged laterally in an L-shaped arrangement; The inner frame (2) comprises a second inner frame (22), and the air inlet and exhaust fan assembly (13) comprises a plurality of air inlet and exhaust fans (131) arranged in the same plane on the second inner frame (22) laterally along the length direction of the air-to-air heat exchanger (12) and with the air inlet facing the outdoor air outlet; 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 compressor refrigeration system (5) comprises an evaporator (52), a condenser (53) and a compressor (51). It is characterized in that The air-to-air heat exchanger (12) is arranged on the inner frame (2) along its length direction and is inclined relative to the bottom circumference of the inner frame (2). The evaporator (52) is flat as a whole and is arranged at the return air outlet of the air-to-air heat exchanger (12) and is fixed on the inner frame (2) from the bottom to the top. The compressor (51) is arranged below the inner frame (2). The condenser (53) is flat as a whole and is arranged at the outdoor air outlet of the air-to-air heat exchanger (12) and is fixed on the inner frame (2) from the bottom to the top. The evaporator (52) and the condenser (53) are arranged in a V-shape as a whole.

2. The indirect evaporative cooling device according to claim 1, It is characterized in that The inner frame (2) comprises a first inner frame (21) and a second inner frame (22) connected vertically. The second supply-return air fan (112) is vertically arranged on the second inner frame (22). The first supply-return air fan (111) is laterally arranged on the first inner frame (21). The compressor refrigeration system (5) is fixedly mounted on the second inner frame (22).

3. The indirect evaporative cooling device according to claim 1, It is characterized in that The outer shell (6) comprises an outer frame (61) accommodating the inner frame (2) and a combined foam panel (62) arranged on the outer frame (61). The combined foam panel (62) comprises a U-shaped first thin plate (621), a heat insulating material (623) arranged inside the first thin plate (621), a second thin plate (622) arranged on top of the heat insulating material (623) and sealed inside the first thin plate (621), and an edge-wrapping thin plate (624) that connects the first thin plate (621) and the second thin plate (622) together along their edges.

4. The indirect evaporative cooling device according to claim 1, It 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 conveying high-pressure water therein through a pipeline, each of the spray pipes (332) being provided with a plurality of spray holes capable of spraying the high-pressure water into water mist, the air intake and exhaust fan assembly (13) introducing the outdoor cold air and the water mist formed at the outdoor air inlet into the air-air heat exchanger (12) through the outdoor air inlet, and the indoor return air introduced into the air-air heat exchanger (12) by the supply and return air fan assembly (11) through the return air inlet for heat exchange, thereby reducing the indoor temperature.

5. The indirect evaporative cooling device according to claim 4, It is characterized in that The spray system (3) further comprises a high-pressure pump (31) for increasing the pressure of a water source to convert it into the high-pressure water; the high-pressure pump (31) is connected to the spray pipe (332) via a pipeline.

6. The indirect evaporative cooling device according to claim 4, It is characterized in that 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 at the outdoor air inlet of the air-to-air heat exchanger (12) and transporting water therein through pipes, the spray pipes (422) being provided with a plurality of spray holes for spraying water, the spray holes being arranged toward the outdoor air inlet of the air-to-air heat exchanger (12).

7. The indirect evaporative cooling device according to claim 6, It is characterized in that The spray system (4) further comprises a circulation pump (411) for extracting water from the water tray (43) for circulation, and the circulation pump (411) is connected to the spray pipe (422) via a pipeline.

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