Double-core-body down-flow type upper spraying indirect evaporative cooling air conditioning unit

Abstract

The invention relates to the technical field of air conditioners, in particular to a double-core-body down-flow type upper spraying indirect evaporative cooling air conditioning unit which comprises a box body. An exhaust cavity is formed in the middle of the box body; a first heat exchange core body and a second heat exchange core body are arranged on the two sides of the box body correspondingly. A first condenser and a second condenser are arranged at the top of the exhaust cavity; a water tank is arranged at the bottom of the exhaust cavity; the box body is provided with an exhaust outlet communicated with the exhaust cavity; an exhaust fan is arranged between the exhaust cavity and the exhaust outlet; the box body is provided with a fresh air opening. The flowing direction of spraying water is kept consistent with the flowing direction of outdoor fresh air, uniform and stable water films are easily formed on the surface of the first heat exchange core body and the surface of the second heat exchange core body, and the heat exchange effect is improved; in addition, the first heat exchange core body and the second heat exchange core body are arranged on the two sides of the box body respectively, the water tank is located between the two heat exchange core bodies, the two heat exchange core bodies share one water tank, the structure is simple, maintenance is convenient, and the water leakage risk and the production cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning, and in particular to a double-core downstream type upper spraying indirect evaporative cooling air conditioning unit. Background Art

[0002] Driven by the application demands of 5G, Internet of Things, cloud computing, artificial intelligence, etc., data centers have experienced explosive development. Indirect evaporative cooling air-conditioning units are widely used in data centers for their high energy-saving rate. The indirect evaporative cooling air-conditioning units used in data centers generally include a spray system, a mechanical refrigeration system, an indoor air system, an outdoor air system, and a heat exchange core for heat exchange between indoor air and outdoor air. There are three main operating modes of indirect evaporative cooling air conditioners used in existing data centers: dry mode, wet mode, and a mixed mode consisting of a wet mode and a mechanical refrigeration system. Under different meteorological conditions, the evaporative cooling system and the mechanical refrigeration system are coordinated and switched to achieve seasonal and time-division control and regulation. The secondary exhaust air is used to cool the condenser of the mechanical refrigeration system to achieve multi-level energy utilization, effectively improving the energy utilization efficiency and the energy efficiency ratio of the system.

[0003] In order to solve the problems of long heat exchange flow path, large core resistance and high fan power in traditional indirect evaporative cooling air-conditioning units using single heat exchange core, some technical solutions of double heat exchange core are proposed.

[0004] The disadvantages of the existing dual heat exchange core technical solution are as follows:

[0005] 1. The existing scheme adopts the upper spraying method. The outdoor air flows from bottom to top, and the spraying liquid flows from top to bottom. The flow directions are opposite, which not only increases the outdoor resistance, but also causes the spraying liquid droplets to fail to wet the entire core surface, and the core heat exchange surface area cannot be effectively utilized;

[0006] 2. The dual heat exchange cores of the existing solution are closely adjacent to each other, and the space at the outlet of the indoor circulating air after passing through the heat exchange core is limited, resulting in large air flow resistance and fan power consumption.

[0007] 3. The existing solution has a spray water tank located at the outdoor fresh air inlet. When the outdoor temperature is low, the water tank needs to be emptied to prevent it from freezing. Especially when the temperature difference between day and night is large, the water tank needs to be replenished during the day and drained at night, which wastes water resources.

[0008] 4. The existing dual heat exchange core solution has two water tanks, which requires a lot of cleaning and maintenance work, has many water tank interfaces and a high risk of leakage, and has a more complicated processing technology, which greatly increases the cost. Summary of the invention

[0009] The purpose of the present invention is to provide a dual-core downstream upper spray indirect evaporative cooling air conditioning unit in view of the above-mentioned deficiencies in the prior art.

[0010] The object of the present invention is achieved through the following technical solutions: A dual-core downstream upper spray indirect evaporative cooling air conditioning unit, comprising a box; an exhaust cavity is provided in the middle of the box; a first heat exchange core and a second heat exchange core are provided on both sides of the box; the first heat exchange core is provided with a first air duct and a second air duct; the second heat exchange core is provided with a third air duct and a fourth air duct;

[0011] The bottom of the first air duct and the bottom of the third air duct are respectively arranged on both sides of the exhaust cavity and are connected to the exhaust cavity; the top of the exhaust cavity is provided with a first condenser and a second condenser; the bottom of the exhaust cavity is provided with a water tank; the top of the first air duct is provided with a first spray pipe; the top of the third air duct is provided with a second spray pipe;

[0012] The box body is provided with an exhaust port connected to the exhaust cavity; an exhaust fan is provided between the exhaust cavity and the exhaust port; the box body is provided with a fresh air port; the top of the first air duct and the top of the third air duct are respectively connected to the fresh air port.

[0013] The present invention is further configured such that the fresh air outlet includes a first fresh air outlet and a second fresh air outlet; the top of the first air duct is connected to the first fresh air outlet; the top of the third air duct is connected to the second fresh air outlet;

[0014] The first fresh air inlet is arranged on one side wall of the box body; the second fresh air inlet is arranged on the other side wall of the box body; and the exhaust port is arranged in the middle of the top surface of the box body.

[0015] The present invention is further configured such that the first fresh air outlet is provided with a first fresh air filter; the second fresh air outlet is provided with a second fresh air filter; and one end of the first condenser abuts against one end of the second condenser.

[0016] The present invention is further configured such that a first air supply cavity is formed between the bottom of the second air duct and one side wall of the box body; a second air supply cavity is formed between the bottom of the fourth air duct and the other side wall of the box body; the first air supply cavity is provided with a first evaporator; the second air supply cavity is provided with a second evaporator;

[0017] The box body is provided with a return air outlet and an air supply outlet; the top of the second air duct and the top of the fourth air duct are respectively connected to the return air outlet; the first air supply chamber and the second air supply chamber are respectively connected to the air supply outlet; a first air supply fan is provided between the first air supply chamber and the air supply outlet; a second air supply fan is provided between the second air supply chamber and the air supply outlet.

[0018] The present invention is further configured such that the return air outlet includes a first return air outlet and a second return air outlet; the top of the second air duct is connected to the first return air outlet; the top of the fourth air duct is connected to the second return air outlet;

[0019] The first return air inlet and the second return air inlet are respectively arranged on both sides of the upper cross-section of the box body; the air supply inlet is arranged at the lower cross-section of the box body.

[0020] The present invention is further configured such that a first return air filter is provided between the top of the second air duct and the first return air outlet; and a second return air filter is provided between the top of the fourth air duct and the second return air outlet.

[0021] The present invention is further configured such that the first heat exchange core and the second heat exchange core are both air-to-air heat exchangers; the cross-sectional shape of the first heat exchange core and the cross-sectional shape of the second heat exchange core are both square; the first air duct and the second air duct are cross-arranged; and the third air duct and the fourth air duct are cross-arranged.

[0022] The present invention is further configured such that a top crossbeam, a bottom crossbeam, a first vertical beam, a second vertical beam, a first side beam and a second side beam are provided in the middle of the box body;

[0023] The first heat exchange core is provided with a first connection surface at a position corresponding to the bottom of the first air duct; the second heat exchange core is provided with a second connection surface at a position corresponding to the bottom of the third air duct;

[0024] The exhaust cavity is enclosed in sequence by a top crossbeam, a first vertical beam, a first connecting surface, a first side beam, a bottom crossbeam, a second side beam, a second connecting surface and a plane where the second vertical beam is located.

[0025] The present invention is further configured such that the water tank is enclosed by a first side beam, a bottom cross beam and a partition where the second side beam is located.

[0026] The present invention is further configured such that the first side beam is tiltedly disposed in the box body; and the second side beam is tiltedly disposed in the box body.

[0027] Beneficial effects of the present invention: The present invention keeps the flow direction of the spray water consistent with the flow direction of the outdoor fresh air, and a uniform and stable water film is easily formed on the surface of the first heat exchange core and the surface of the second heat exchange core, thereby improving the heat exchange effect; in addition, the first heat exchange core and the second heat exchange core are arranged on both sides of the box body, and the water tank is located between the two heat exchange cores. The two heat exchange cores share one water tank, which has a simple structure, is easy to maintain, and reduces the risk of water leakage and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Among them: 1. box; 2. first heat exchange core; 21. first air duct; 22. second air duct; 23. first spray pipe; 3. second heat exchange core; 31. third air duct; 32. fourth air duct; 33. second spray pipe; 4. exhaust cavity; 41. first condenser; 42. second condenser; 43. water tank; 44. exhaust fan; 5. exhaust outlet; 51. first fresh air outlet; 52. second fresh air outlet; 61. first air supply cavity; 62. first Second air supply chamber; 63, first evaporator; 64, second evaporator; 65, first air supply fan; 66, second air supply fan; 7, air supply outlet; 71, first return air outlet; 72, second return air outlet; 73, first return air filter; 74, second return air filter; 81, top cross beam; 82, bottom cross beam; 83, first vertical beam; 84, second vertical beam; 85, first side beam; 86, second side beam; 91, first connecting surface; 92, second connecting surface. DETAILED DESCRIPTION

[0031] The present invention is further described in conjunction with the following examples.

[0032] Depend on Figure 1 It can be seen that the dual-core downstream upper spray indirect evaporative cooling air-conditioning unit described in this embodiment includes a box body 1; an exhaust cavity 4 is provided in the middle of the box body 1; a first heat exchange core 2 and a second heat exchange core 3 are provided on both sides of the box body 1; the first heat exchange core 2 is provided with a first air duct 21 and a second air duct 22; the second heat exchange core 3 is provided with a third air duct 31 and a fourth air duct 32;

[0033] The bottom of the first air duct 21 and the bottom of the third air duct 31 are respectively arranged on both sides of the exhaust cavity 4 and are connected to the exhaust cavity 4; the top of the exhaust cavity 4 is provided with a first condenser 41 and a second condenser 42; the bottom of the exhaust cavity 4 is provided with a water tank 43; the top of the first air duct 21 is provided with a first spray pipe 23; the top of the third air duct 31 is provided with a second spray pipe 33;

[0034] The box body 1 is provided with an exhaust port 5 connected to the exhaust chamber 4; an exhaust fan 44 is provided between the exhaust chamber 4 and the exhaust port 5; the box body 1 is provided with a fresh air port; the top of the first air duct 21 and the top of the third air duct 31 are respectively connected to the fresh air port; wherein the first spray pipe 23 and the second spray pipe 33 are respectively connected to the water tank 43 through a water pump.

[0035] Specifically, the dual-core downstream upper spray indirect evaporative cooling air-conditioning unit described in this embodiment can effectively improve the heat exchange efficiency of the whole machine by simultaneously arranging the first heat exchange core 2 and the second heat exchange core 3 in the box body 1; in addition, during use, under the action of the exhaust fan 44, outdoor fresh air enters the first air duct 21 and the third air duct 31 from the fresh air outlet, enters the exhaust chamber 4 after heat exchange and temperature rise, and passes through the first condenser 41 and the second condenser 42 to be mixed, and then discharges the heated outdoor fresh air and the heat of the first condenser 41 and the second condenser 42 from the exhaust outlet 5 to the box body 1.

[0036] In addition, the present embodiment adopts an upper spraying method, and the first spray pipe 23 and the second spray pipe 33 of the spray system are respectively arranged at the top of the first air duct 21 and the top of the third air duct 31. The water in the water tank 43 flows into the first spray pipe 23 and the second spray pipe 33 after being pressurized by the water pump, and then is sprayed on the first heat exchange core 2 and the second heat exchange core 3 through the nozzle. The spray water can flow from the upper sides to the middle and lower part along the direction of the outdoor fresh air flow. The spray water evaporates and absorbs heat in the first heat exchange core 2 and the second heat exchange core 3, and cools the inner surface of the first air duct 21 of the first heat exchange core 2, the inner surface of the third air duct 31 of the second heat exchange core 3 and the outdoor fresh air. Finally, the spray water that has not been evaporated converges into the water tank 43.

[0037] Through the above-mentioned arrangement, the present embodiment can ensure that the flow direction of the spray water is consistent with the flow direction of the outdoor fresh air, and the surface of the first air duct 21 of the first heat exchange core 2 and the surface of the third air duct 31 of the second heat exchange core 3 are easy to form a uniform and stable water film, thereby improving the evaporative heat exchange effect; in addition, the water tank 43 is located on the air outlet side of the first heat exchange core 2 and the second heat exchange core 3. Because the first air duct 21 of the first heat exchange core 2 exchanges heat with the indoor high-temperature airflow of the second air duct 22, and the third air duct 31 of the second heat exchange core 3 exchanges heat with the indoor high-temperature airflow of the fourth air duct 32, even if the outdoor fresh air temperature is very low, after the heat exchange core is heated, the temperature of the water tank 43 on the air outlet side can be guaranteed to be above 0°C. Therefore, compared with the traditional method in which the water tank is directly in contact with the outdoor fresh air, there is no need to drain the water in the water tank 43 for anti-freezing considerations because there is water in the water tank 43, which saves Water resources; secondly, the first heat exchange core 2 and the second heat exchange core 3 are arranged on both sides of the box body 1, and the water tank 43 is located between the two heat exchange cores. The two heat exchange cores share one water tank 43, which has a simple structure and is easy to maintain, reducing the risk of water leakage and production costs; in addition, the first condenser 41, the second condenser 42 and the water tank 43 are located in the same space. After the water in the water tank 43 evaporates naturally, the air humidity in the exhaust chamber 4 is high, which is beneficial to reducing the inlet air temperature of the first condenser 41 and the second condenser 42, and improving the heat exchange efficiency of the outdoor fresh air flow at the two condensers. Compared with the traditional method in which the spray pipe is set close to the condenser, because the natural evaporation of water in the water tank 43 is directly used to increase the outdoor fresh air humidity, the air humidity is increased, and there is no need to set a water baffle to prevent excessive humidity and affect the service life of the two condensers and the exhaust fan 44.

[0038] The present embodiment describes a dual-core downstream upper spray indirect evaporative cooling air-conditioning unit, wherein the fresh air inlet comprises a first fresh air inlet 51 and a second fresh air inlet 52; the top of the first air duct 21 is connected to the first fresh air inlet 51; the top of the third air duct 31 is connected to the second fresh air inlet 52; through the above arrangement, outdoor fresh air enters the first air duct 21 and the third air duct 31 from the first fresh air inlet 51 and the second fresh air inlet 52 respectively, making the structure of the entire unit more reasonable and reliable.

[0039] The first fresh air inlet 51 is arranged on one side wall of the box body 1; the second fresh air inlet 52 is arranged on the other side wall of the box body 1; the exhaust port 5 is arranged in the middle of the top surface of the box body 1. The above arrangement allows the wind to flow stably, and the fresh air inlets are arranged on the two opposite left and right side walls of the unit at the same time, so that the fresh air inlet area is larger, and at the same air flow speed, the amount of outdoor fresh air involved in heat exchange is also larger, so that in the same working time of the unit, more outdoor cold sources can be used, making the operation of the entire unit more energy-saving, and the left and right relative arrangement also makes the overall structure of the unit stable and reliable.

[0040] In the dual-core downstream upper spray indirect evaporative cooling air conditioning unit described in this embodiment, the first fresh air outlet 51 is provided with a first fresh air filter; the second fresh air outlet 52 is provided with a second fresh air filter; one end of the first condenser 41 abuts against one end of the second condenser 42. The above arrangement can prevent impurities such as leaves and dust carried by outdoor fresh air from entering the first air duct 21 and the third air duct 31.

[0041] In the dual-core downstream upper spray indirect evaporative cooling air-conditioning unit described in this embodiment, a first air supply cavity 61 is formed between the bottom of the second air duct 22 and one side wall of the box body 1; a second air supply cavity 62 is formed between the bottom of the fourth air duct 32 and the other side wall of the box body 1; the first air supply cavity 61 is provided with a first evaporator 63; the second air supply cavity 62 is provided with a second evaporator 64;

[0042] The box body 1 is provided with a return air port and an air supply port 7; the top of the second air duct 22 and the top of the fourth air duct 32 are respectively connected to the return air port; the first air supply chamber 61 and the second air supply chamber 62 are respectively connected to the air supply port 7; a first air supply fan 65 is provided between the first air supply chamber 61 and the air supply port 7; a second air supply fan 66 is provided between the second air supply chamber 62 and the air supply port 7.

[0043] During use, under the action of the first blower 65 and the second blower 66, the indoor return air enters the second air duct 22 and the fourth air duct 32 from the return air port, and then enters the first air supply chamber 61 and the second air supply chamber 62 respectively, and respectively passes through the first evaporator 63 and the second evaporator 64 to transport the cold air to the indoor from the air supply port 7; in this embodiment, by arranging the first evaporator 63 and the second evaporator 64 on both sides of the box body 1, it is convenient to open the side panel of the box body 1 to disassemble or repair the evaporator; in addition, by arranging the first blower 65 and the second blower 66, two rows of blowers are arranged in the box body 1, which can effectively increase the air supply volume, thereby further improving the heat exchange efficiency of the whole machine, and under the energy-saving strategy, the cooling capacity and cooling demand can be adapted by selectively shutting down different numbers of fans; the other two evaporators are respectively placed under the heat exchange cores on both sides, and are not isolated and closed by the air ducts, which is conducive to inspection and maintenance.

[0044] The present embodiment describes a dual-core downstream upper spray indirect evaporative cooling air conditioning unit, wherein the return air outlet includes a first return air outlet 71 and a second return air outlet 72; the top of the second air duct 22 is connected to the first return air outlet 71; the top of the fourth air duct 32 is connected to the second return air outlet 72; the first return air outlet 71 and the second return air outlet 72 are respectively arranged on the left and right sides of the upper part of the cross section of the box body 1; the air supply outlet 7 is arranged at the lower part of the cross section of the box body 1. The present embodiment arranges the first return air outlet 71 and the second return air outlet 72 on both sides of the top of the box body 1 so that the air flow pressure will not squeeze and interfere with each other, thereby increasing the air duct space for indoor circulating air, and can realize the side-by-side placement of double-row air supply fans, which can reduce indoor air flow resistance and fan power consumption; the indoor air flow can enter and exit in a horizontal direction, and at the same time, the return air hot air flow is at the upper part, and the supply air cold air flow is at the lower part, which is conducive to connecting with the air duct of the external data center computer room, so that the circulating air flow can flow stably.

[0045] In the dual-core downstream upper spray indirect evaporative cooling air conditioning unit described in this embodiment, a first return air filter 73 is provided between the top of the second air duct 22 and the first return air outlet 71; a second return air filter 74 is provided between the top of the fourth air duct 32 and the second return air outlet 72. The above arrangement can prevent impurities from entering the second air duct 22 and the fourth air duct 32.

[0046] The present embodiment describes a dual-core downstream upper spray indirect evaporative cooling air-conditioning unit, wherein the first heat exchange core 2 and the second heat exchange core 3 are both air-to-air heat exchangers; the above arrangement can effectively enable the first air duct 21 to exchange heat with the second air duct 22, and effectively enable the third air duct 31 to exchange heat with the fourth air duct 32; the cross-sectional shape of the first heat exchange core 2 and the cross-sectional shape of the second heat exchange core 3 are both square; the square heat exchange core enables one of its diagonals to be parallel to the horizontal direction, and the other diagonal to be parallel to the vertical direction; the above arrangement can enable the airflow in the core air duct to fully contact to achieve efficient heat conduction and heat exchange; the first air duct 21 and the second air duct 22 are cross-arranged; the third air duct 31 and the fourth air duct 32 are cross-arranged; the above arrangement facilitates heat exchange between the first air duct 21 and the second air duct 22, and facilitates heat exchange between the third air duct 31 and the fourth air duct 32.

[0047] The present embodiment describes a double-core downstream upper spray indirect evaporative cooling air-conditioning unit, wherein the middle portion of the box body 1 is provided with a top crossbeam 81, a bottom crossbeam 82, a first vertical beam 83, a second vertical beam 84, a first side beam 85 and a second side beam 86; the first heat exchange core 2 is provided with a first connecting surface 91 at a position corresponding to the bottom of the first air duct 21; the second heat exchange core 3 is provided with a second connecting surface 92 at a position corresponding to the bottom of the third air duct 31; the exhaust cavity 4 is enclosed in the shape of a long-necked flask by the top crossbeam 81, the first vertical beam 83, the first connecting surface 91, the first side beam 85, the bottom crossbeam 82, the second side beam 86, the second connecting surface 92 and the plane where the second vertical beam 84 is located. Through the above-mentioned arrangement, the overall structure of the exhaust chamber 4 is stable and reliable, and the outdoor fresh air can flow stably; at the same time, the bottle-shaped bottom has a larger capacity when used as the water tank 43, and the large space is also conducive to the outdoor fresh air passing through the core for heat exchange, and then being fully mixed and evenly mixed in the water tank 43 and then participating in heat exchange in the condenser. The airflow with uniform temperature has higher heat exchange efficiency; the long-necked exhaust chamber channel is conducive to increasing the wind pressure of the exhaust fan 44 and the wind speed passing through the condenser. When the airflow flows from the bottom of the large space to the narrow neck, the air flow rate can be increased under the action of fluid mechanics, thereby enhancing the heat exchange efficiency.

[0048] In the dual-core downstream upper spray indirect evaporative cooling air conditioning unit described in this embodiment, the water tank 43 is directly enclosed by the first side beam 85, the bottom cross beam 82 and the partition at the second side beam 86. With the above arrangement, there is no need to set up an additional water tank 43.

[0049] Furthermore, a separate water tank 43 may be provided, and the water tank wall is arranged in contact with the partition at the first side beam 85, the bottom cross beam 82 and the second side beam 86. With the above arrangement, the water tank 43 can be directly withdrawn at the end of the unit not connected to the air duct for maintenance.

[0050] In the dual-core downstream upper spray indirect evaporative cooling air conditioning unit described in this embodiment, the first side beam 85 is tiltedly arranged in the box body 1; the second side beam 86 is tiltedly arranged in the box body 1. The above arrangement facilitates the spray water that is not completely evaporated in the heat exchange core to be collected in the middle of the water tank 43.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit, characterized in that: The invention comprises a box body (1); an exhaust cavity (4) is provided in the middle of the box body (1); a first heat exchange core (2) and a second heat exchange core (3) are provided on both sides of the box body (1); the first heat exchange core (2) is provided with a first air duct (21) and a second air duct (22); the second heat exchange core (3) is provided with a third air duct (31) and a fourth air duct (32); The bottom of the first air duct (21) and the bottom of the third air duct (31) are respectively arranged on both sides of the exhaust cavity (4) and are in communication with the exhaust cavity (4); a first condenser (41) and a second condenser (42) are arranged at the top of the exhaust cavity (4); a water tank (43) is arranged at the bottom of the exhaust cavity (4); a first spray pipe (23) is arranged at the top of the first air duct (21); and a second spray pipe (33) is arranged at the top of the third air duct (31); The box body (1) is provided with an exhaust port (5) connected to an exhaust cavity (4); an exhaust fan (44) is provided between the exhaust cavity (4) and the exhaust port (5); the box body (1) is provided with a fresh air port; the top of the first air duct (21) and the top of the third air duct (31) are respectively connected to the fresh air port.

2. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 1, characterized in that: The fresh air inlet comprises a first fresh air inlet (51) and a second fresh air inlet (52); the top of the first air duct (21) is connected to the first fresh air inlet (51); the top of the third air duct (31) is connected to the second fresh air inlet (52); The first fresh air inlet (51) is arranged on one side wall of the box body (1); the second fresh air inlet (52) is arranged on the other side wall of the box body (1); and the exhaust port (5) is arranged in the middle of the top surface of the box body (1).

3. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 2, characterized in that: The first fresh air inlet (51) is provided with a first fresh air filter; the second fresh air inlet (52) is provided with a second fresh air filter; one end of the first condenser (41) abuts against one end of the second condenser (42).

4. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 1, characterized in that: A first air supply cavity (61) is formed between the bottom of the second air duct (22) and one side wall of the box body (1); a second air supply cavity (62) is formed between the bottom of the fourth air duct (32) and the other side wall of the box body (1); the first air supply cavity (61) is provided with a first evaporator (63); the second air supply cavity (62) is provided with a second evaporator (64); The housing (1) is provided with a return air port and an air supply port (7); the top of the second air duct (22) and the top of the fourth air duct (32) are respectively connected to the return air port; the first air supply chamber (61) and the second air supply chamber (62) are respectively connected to the air supply port (7); a first air supply fan (65) is provided between the first air supply chamber (61) and the air supply port (7); and a second air supply fan (66) is provided between the second air supply chamber (62) and the air supply port (7).

5. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 4, characterized in that: The return air port comprises a first return air port (71) and a second return air port (72); the top of the second air duct (22) is connected to the first return air port (71); the top of the fourth air duct (32) is connected to the second return air port (72); The first return air port (71) and the second return air port (72) are respectively arranged on both sides of the upper part of the cross section of the box body (1); and the air supply port (7) is arranged at the lower part of the cross section of the box body (1).

6. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 5, characterized in that: A first return air filter (73) is provided between the top of the second air duct (22) and the first return air outlet (71); and a second return air filter (74) is provided between the top of the fourth air duct (32) and the second return air outlet (72).

7. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 1, characterized in that: The first heat exchange core (2) and the second heat exchange core (3) are both air-to-air heat exchangers; the cross-sectional shape of the first heat exchange core (2) and the cross-sectional shape of the second heat exchange core (3) are both square; the first air duct (21) and the second air duct (22) are arranged crosswise; and the third air duct (31) and the fourth air duct (32) are arranged crosswise.

8. The dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 1, characterized in that: The middle part of the box body (1) is provided with a top cross beam (81), a bottom cross beam (82), a first vertical beam (83), a second vertical beam (84), a first side beam (85) and a second side beam (86); The first heat exchange core (2) is provided with a first connection surface (91) at a position corresponding to the bottom of the first air duct (21); and the second heat exchange core (3) is provided with a second connection surface (92) at a position corresponding to the bottom of the third air duct (31); The exhaust cavity (4) is enclosed in sequence by a top cross beam (81), a first vertical beam (83), a first connecting surface (91), a first side beam (85), a bottom cross beam (82), a second side beam (86), a second connecting surface (92) and a plane where the second vertical beam (84) is located.

9. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 8, characterized in that: The water tank (43) is enclosed by a first side beam (85), a bottom cross beam (82) and a partition where the second side beam (86) is located.

10. A dual-core downstream upper spray indirect evaporative cooling air conditioning unit according to claim 9, characterized in that: The first side beam (85) is arranged obliquely in the box body (1); and the second side beam (86) is arranged obliquely in the box body (1).

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