CN219868264U - External indirect evaporation air conditioning unit - Google Patents

Abstract

The utility model discloses an external indirect evaporation air conditioning unit, relates to the technical field of air conditioning equipment, and aims to solve the problem that the indirect evaporation air conditioning unit occupies a large machine room space. The external indirect evaporation air conditioning unit is positioned outside a machine room and comprises a shell, a heat exchange core, a first fan, a second fan, an evaporator and a condenser. The casing has holding the chamber, and heat exchange core, first fan, second fan etc. are located the holding chamber of casing. An outdoor air inlet, an outdoor air outlet, an indoor air inlet and an indoor air outlet are formed in the shell, outdoor cold air enters the heat exchange core body from the outdoor air inlet, and indoor hot air enters the heat exchange core body from the indoor air inlet. The cold air cools the hot air, then the outdoor air after heat exchange flows out of the heat exchange core body and is discharged from the outdoor air outlet, and the indoor air after cooling flows out of the heat exchange core body and flows back into the room from the indoor air outlet.

Description

External indirect evaporation air conditioning unit

Technical Field

The utility model relates to the technical field of air conditioning equipment, in particular to an external indirect evaporation air conditioning unit.

Background

The equipment in data center and computer lab can produce a large amount of heat in the course of the work, in order to ensure that equipment can normal operating, need to cool down to the inside computer lab. In order to save electric energy, compression refrigeration can be combined with an indirect evaporation technology, the air to be treated is precooled by the indirect evaporation technology, and generally, the indirect evaporation unit is large in size, occupies a large space and is not suitable for reconstruction of an old machine room.

Disclosure of Invention

The utility model provides an external indirect evaporation air conditioning unit which is used for solving the problems that the indirect evaporation unit is large in size and occupies a large space.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an external indirect evaporation air conditioning unit is arranged outside a machine room and comprises a shell, a heat exchange core, a first fan, a second fan, an evaporator and a condenser. The casing is arranged outside the machine room and is provided with a containing cavity. Based on the above, the casing is provided with an outdoor air inlet, an outdoor air outlet, an indoor air outlet and an indoor air inlet.

In this case, the heat exchange core is disposed in the accommodating cavity of the casing, and the heat exchange core can enable the outdoor cooler air to exchange heat with the hot air in the machine room, and pre-cool the hot air in the machine room by using the outdoor cooler air.

In order to achieve the purpose of pre-cooling hot air in a machine room by using outdoor cold air, the heat exchange core body is provided with a plurality of outdoor air flow passages and a plurality of indoor air flow passages. The outdoor air flow channels penetrate through the heat exchange core body, and the outdoor air flow channels are provided with a first air inlet and a first air outlet which are oppositely arranged. The plurality of indoor air flow passages penetrate through the heat exchange core body, and the indoor air flow passages are provided with a second air inlet and a second air outlet which are oppositely arranged. In addition, the outdoor air flow passage and the indoor air flow passage are arranged at intervals, and the outdoor air flow passage and the indoor air flow passage are not communicated.

In this way, the cool air outside the machine room can enter the outdoor air flow passage from the first air inlet, flow out of the machine room along the outdoor air flow passage and from the first air outlet. Meanwhile, the hot air in the machine room can enter the indoor air flow channel from the second air inlet, flow along the indoor air flow channel and flow back into the room from the second air outlet.

In the process, the cold air in the outdoor air flow channel and the hot air in the indoor air flow channel can perform heat exchange, and the cold air can pre-cool the hot air, so that the temperature of the hot air flowing back into the machine room is reduced, and the effect of reducing the temperature in the machine room is achieved.

In order to allow the outdoor cool air to enter the outdoor air flow path and the indoor hot air to enter the indoor air flow path. The external indirect evaporation air conditioning unit provided by the utility model further comprises a first fan and a second fan. The first fan is located in the accommodating cavity of the shell, and is arranged adjacent to the outdoor air inlet and used for inputting outdoor air into the outdoor air flow channel. Specifically, when the first fan works, outdoor cold air can enter the accommodating cavity through an outdoor air inlet formed in the casing, and then enters the outdoor air flow passage through the first air inlet.

On the basis, the second fan is positioned in the accommodating cavity and is arranged adjacent to the indoor air outlet for inputting indoor hot air into the indoor air flow channel. When the second fan works, indoor hot air can enter the accommodating cavity through an indoor air outlet formed in the casing, and then enters the indoor air flow passage through the second air inlet.

In this way, under the action of the first fan and the second fan, outdoor cold air can be ensured to enter the outdoor air flow passage, indoor hot air enters the indoor air flow passage, and then the cold air can be ensured to precool the hot air. In autumn and winter season or cold areas with lower temperature, the machine room can be cooled through the external indirect evaporation air conditioning unit.

When the outdoor ambient temperature is high, in order to ensure that the temperature in the machine room is at a temperature suitable for the normal operation of the equipment. The external indirect evaporation air conditioning unit can further comprise an evaporator and a condenser, wherein the evaporator is positioned in the accommodating cavity and is arranged at the indoor air inlet of the shell, the condenser is positioned in the accommodating cavity and is arranged at the outdoor air outlet of the shell.

Therefore, when the precooled indoor air in the indoor air flow passage flows along the indoor air flow passage and flows out of the second air outlet, the precooled indoor air flows through the evaporator arranged at the indoor air inlet, the evaporator can cool the air to be returned to the machine room again, and the temperature in the machine room can be effectively reduced.

In addition, because the condenser sets up in outdoor wind export department, this makes the air that flows out in the outdoor wind flow path when flowing outside the computer lab through outdoor wind export, can cool off the condenser to a certain extent, need not to dispose the fan additionally and cool off the condenser, can reduce the size of unit, and can also reduce cost.

Further, the external indirect evaporation air conditioning unit further comprises a spraying device which is arranged at the first air inlet, and cold water can be sprayed into the outdoor air flow channel by the spraying device so as to cool air flow in the outdoor air flow channel.

Further, the spraying device comprises a water storage box, a water supply pipe and a plurality of liquid distribution pipes. The water storage box is used for storing cold water, and the water supply pipe is communicated with the water storage box and provides cold water for the water storage box. The liquid distribution pipes are communicated with the water storage box, are arranged adjacent to the first air inlet of the outdoor air flow channel, are provided with a plurality of liquid distribution holes at intervals on one side of the liquid distribution pipes facing the first air inlet, and correspond to one outdoor air flow channel.

Further, the spraying device further comprises a plurality of liquid-separating branch pipes, one ends of the liquid-separating branch pipes are connected with the liquid-separating holes, and the other ends of the liquid-separating branch pipes extend into the first air inlet so that cold water flows into the outdoor air flow passage, and one liquid-separating branch pipe corresponds to one liquid-separating hole.

Further, the spraying device further comprises a water collecting box, and the water collecting box is arranged adjacent to the first air outlet of the outdoor air flow channel and is used for collecting cold water.

Further, the external indirect evaporation air conditioning unit also comprises an exhaust pipe and a return air pipe. The exhaust pipe is provided with a first end and a second end, wherein the first end is communicated with indoor air, the second end extends to the outside, and the second end is communicated with an indoor air inlet. The return air pipe is provided with a third end and a fourth end, wherein the third end extends to the outside of the room and is communicated with an indoor air outlet, and the fourth end is communicated with indoor air.

Further, the outdoor air flow channel extends along a first direction, the indoor air flow channel extends along a second direction, the first direction is perpendicular to the wall, and the first direction is perpendicular to the second direction.

Further, the heat exchange core body comprises a plurality of sub-cores, outdoor air flow channels and indoor air flow channels are formed in the plurality of sub-cores, the plurality of sub-cores are arranged in a stacked mode along a third direction, and the third direction is perpendicular to the first direction and is perpendicular to the second direction.

Further, a plurality of partition boards are arranged in one outdoor air flow channel at intervals, and a plurality of first air inlets are formed by the partition boards. A plurality of partition boards are arranged in the second flow passage at intervals, a plurality of second air inlets are separated by the partition boards, and one liquid separation branch pipe corresponds to one first air inlet.

Further, the external indirect evaporation air conditioning unit further comprises a filter screen which is arranged at the outdoor air inlet.

Drawings

Fig. 1 is a schematic structural diagram of an external indirect evaporation air conditioning unit according to an embodiment of the present utility model;

FIG. 2 is a second schematic diagram of an external indirect evaporation air conditioning unit according to an embodiment of the present utility model;

FIG. 3 is a third schematic diagram of an external indirect evaporation air conditioning unit according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of an external indirect evaporation air conditioning unit according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of an external indirect evaporation air conditioning unit according to an embodiment of the present utility model.

Reference numerals:

1-a shell; 10-a receiving cavity; 11-outdoor wind inlet; 12-an outdoor wind outlet; 13-indoor wind outlet; 14-indoor wind inlet;

2-a heat exchange core; 20-a sub-core; 210-a separator; 21-an outdoor air flow channel; 211-a first air inlet; 212-a first air outlet; 22-an indoor air flow passage; 221-a second air inlet; 222-a second air outlet; 23-a first fan; 24-a second fan; 25-an evaporator; 26-a condenser;

3-spraying device; 31-a water storage box; 32-a water supply pipe; 33-a liquid separating pipe; 330-a liquid separation hole; 34-a liquid separation branch pipe; 35-a water collecting box;

41-an exhaust pipe; 411 a first end; 412-a second end; 42-return air pipe; 421-third end; 422-fourth end.

Detailed Description

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model provides an external indirect evaporation air conditioning unit which is arranged outside a machine room. As shown in fig. 1, the external indirect evaporation air conditioning unit mainly comprises a casing 1 and a heat exchange core 2. Wherein, the casing 1 is arranged outside the machine room, and the casing 1 is provided with a containing cavity 10. Based on this, the casing 1 is provided with an outdoor air inlet 11, an outdoor air outlet 12, an indoor air outlet 13, and an indoor air inlet 14.

In some embodiments of the utility model, there is a space between the cabinet 1 and the wall of the machine room. The outdoor air outlet 12 is formed in a wall of the casing 1 facing the wall.

In this case, the heat exchange core 2 is disposed in the accommodating cavity 10 of the casing 1, and the heat exchange core 2 can make the outdoor cooler air exchange heat with the hot air in the machine room, and pre-cool the hot air in the machine room by using the outdoor cooler air.

For the purpose of pre-cooling hot air in a machine room by using outdoor cold air, as shown in fig. 2, the heat exchange core 2 has a plurality of outdoor air flow passages 21 and a plurality of indoor air flow passages 22. The plurality of outdoor air flow passages 21 penetrate through the heat exchange core 2, and the outdoor air flow passages 21 have first air inlets 211 and first air outlets 212 (see fig. 1) disposed opposite to each other. The plurality of indoor air flow passages 22 penetrate through the heat exchange core 2, and the indoor air flow passages 22 are provided with a second air inlet 221 and a second air outlet 222 which are oppositely arranged. In addition, the outdoor air flow path 21 and the indoor air flow path 22 are provided at a distance from each other, and the outdoor air flow path 21 and the indoor air flow path 22 are not communicated with each other.

In this way, the cool air outside the machine room can enter the outdoor air flow path 21 through the first air inlet 211, flow along the outdoor air flow path 21, and flow out of the machine room through the first air outlet 212. Meanwhile, the hot air in the machine room may enter the inflow indoor air duct 22 through the second air inlet 221, flow along the indoor air duct 22, and flow back into the room from the second air outlet 222.

In this process, the cold air in the outdoor air flow channel 21 and the hot air in the indoor air flow channel 22 can exchange heat, and the cold air can pre-cool the hot air, so that the temperature of the hot air flowing back into the machine room is reduced, and the effect of reducing the temperature in the machine room is achieved.

In order to allow the outdoor cool air to enter the outdoor air flow path 21 and the indoor hot air to enter the indoor air flow path 22. As shown in fig. 1, the external indirect evaporation air conditioning unit provided by the utility model further comprises a first fan 23 and a second fan 24.

Wherein the first fan 23 is located in the receiving chamber 10 of the cabinet 1, and the first fan 23 is disposed adjacent to the outdoor air inlet 11 for inputting outdoor air into the outdoor air flow path 21. Specifically, when the first fan 23 is operated, the outdoor cool air may enter the accommodating chamber 10 through the outdoor air inlet 11 formed in the casing 1, and then enter the outdoor air flow path 21 through the first air inlet 211.

On the basis of this, a second fan 24 is located in the accommodating chamber 10 and is disposed adjacent to the indoor air outlet 13 for inputting indoor hot air into the indoor air flow passage 22. When the second fan 24 works, indoor hot air can enter the accommodating cavity 10 through the indoor air outlet 13 formed in the casing 1, and then enters the indoor air flow passage 22 through the second air inlet 221.

In this way, under the action of the first fan 23 and the second fan 24, the outdoor cold air can be ensured to enter the outdoor air flow channel 21, the indoor hot air can be ensured to enter the indoor air flow channel 22, and then the cold air can be ensured to precool the hot air. In autumn and winter season or cold areas with lower temperature, the machine room can be cooled through the external indirect evaporation air conditioning unit.

In some embodiments of the present utility model, the external indirect evaporation air conditioning unit further includes a filter screen, where the filter screen is disposed at the outdoor air inlet 11. In this way, when the second fan 24 works to make outdoor air enter the casing 1, the filter screen can play a role in blocking, so as to prevent sundries from being sucked into the casing 1, and further prevent the external indirect evaporation air conditioning unit from being damaged.

When the outdoor ambient temperature is high, in order to ensure that the temperature in the machine room is at a temperature suitable for the normal operation of the equipment. The external indirect evaporation air conditioning unit may further include an evaporator and a condenser, as shown in fig. 1, the evaporator 25 is located in the accommodating cavity 10 and is disposed at the indoor air inlet 14 of the casing 1, the condenser 26 is located in the accommodating cavity 10, and the condenser 26 is disposed at the outdoor air outlet 12 of the casing 1.

Thus, when the precooled indoor air in the indoor air flow passage 22 flows along the indoor air flow passage 22 and flows out from the second air outlet 222, the precooled indoor air flows through the evaporator 25 arranged at the indoor air inlet 14, and the evaporator 25 can cool the air to be returned into the machine room again, so that the temperature in the machine room can be effectively reduced.

In addition, since the condenser 26 is disposed at the outdoor air outlet 12, the air flowing out of the outdoor air flow passage 21 can cool the condenser 26 to a certain extent when flowing out of the machine room through the outdoor air outlet 12, the condenser 26 is not required to be cooled by an additional fan, the size of the machine set can be reduced, and the cost can be reduced.

As can be seen from the above, the casing 1 is disposed outside the machine room, and on this basis, the heat exchange core 2, the first fan 23, the second fan 24, and the evaporator 25 and the condenser 26 are disposed in the housing chamber of the casing 1. The external indirect evaporation air conditioning unit provided by the embodiment of the utility model can be arranged outside the machine room, is suitable for old machine rooms with inconvenient reconstruction of the internal structure of the machine room, or is not enough in the internal space of the machine room, so that the problem that the indirect evaporation unit occupies a larger machine room space is solved.

On this basis, in order to allow the outdoor air to enter the cabinet 1 and enter the outdoor air flow passage 21 of the heat exchange core 2, and to be discharged outside the machine room along the outdoor air flow passage 21. As shown in fig. 1, the external indirect evaporation air conditioning unit further includes an exhaust duct 41 and a return duct 42. The exhaust duct 41 has a first end 411 and a second end 412, the first end 411 communicates with indoor air, the second end 412 extends to the outside, and the second end communicates with the indoor air outlet 13. The return duct 42 has a third end 421 which extends to the outside and communicates with the indoor air inlet 14, and a fourth end 422 which communicates with the indoor air.

Thus, when the first fan 23 is operated, air in the machine room enters the exhaust duct 41 from the first end 411 of the exhaust duct 41, flows along the exhaust duct 41, and sequentially enters the indoor air flow passage 22 of the heat exchange core 2 through the indoor air outlet 13 and the second air inlet. Further, the air in the indoor air flow path 22 will flow along the indoor air flow path 22 and out from the second air outlet 222. And the air also flows through the evaporator arranged at the indoor air inlet, so that the evaporator can further cool the part of the return air. Further, the air which is cooled again by the evaporator flows into the return air pipe 42 and flows back into the machine room from the fourth end 422 of the return air pipe 42, so that the cooling of the machine room is realized.

In addition, in some embodiments, the outdoor air inlet and the outdoor air outlet are formed on a side of the casing facing the inner side wall of the machine room. Thus, the piping design of the exhaust duct 41 and the return duct 42 can be simplified, and the laying lengths of the exhaust duct 41 and the return duct 42 can be shortened.

On the basis, referring to fig. 3 and 4, the external indirect evaporation air conditioner unit further comprises a spraying device 3, wherein the spraying device 3 is arranged at the first air inlet 211 of the outdoor air flow channel 21, and the spraying device 3 can spray cold water into the outdoor air flow channel 21 to cool the air flow in the outdoor air flow channel 21.

In this way, when the spraying device 3 sprays cold water into the outdoor air flow path 21, the outdoor air in the outdoor air flow path 21 can directly contact with the cold water and exchange heat to form cold air. In this way, the indoor air flowing in the indoor air flow path 22 can exchange heat with the cool air in the outdoor air flow path 21, and the indoor air is not in direct contact with the cool water or the cool water-cooled outdoor air during the heat exchange. The indoor air can exchange heat under the condition of unchanged humidity, so that the humidity of the air flowing back into the machine room is unchanged, the humidity in the machine room is unchanged, and the working environment of equipment in the machine room is stable.

As described above, the shower device 3 may be provided to cool the outdoor air flowing into the outdoor air duct 21, in addition to directly cooling the indoor return air by the outdoor cool air.

The shower device 3 will be further described below. As shown in fig. 3, the shower device 3 includes a water storage box 31, a water supply pipe 32, and a plurality of liquid distribution pipes 33. Wherein, the water storage box 31 is used for storing cold water, and the delivery pipe 32 is communicated with the water storage box 31 for providing cold water for the water storage box 31. Based on this, the plurality of liquid dividing pipes 33 communicate with the water storage box 31, the plurality of liquid dividing pipes 33 are disposed adjacent to the first air inlet 211 of the outdoor air flow passage 21, and one liquid dividing pipe 33 corresponds to one outdoor air flow passage 21. In addition, the liquid dividing pipe 33 is provided with a plurality of liquid dividing holes 330 at intervals on a side facing the first air inlet 211.

In this way, the water supply pipe 32 injects cold water into the water storage box 31, the cold water flows into the plurality of liquid separation pipes 33 communicating with the water storage box 31, and then the cold water flows out from the liquid separation holes 330 formed in the liquid separation pipes 33 at intervals, and flows into the outdoor airflow path 21 from the first air inlet 211. The purpose of cooling the air in the outdoor airflow path 21 is achieved.

In this case, a plurality of partitions 210 are provided in the outdoor airflow path 21 at intervals, and the partitions 210 partition a plurality of first air inlets 211 (see fig. 2). A plurality of partition plates 210 are also arranged in the indoor air flow passage 22 at intervals, and a plurality of second air inlets 221 are partitioned by the partition plates 210.

In this way, the plurality of liquid distribution holes 330 formed in the liquid distribution pipe 33 at intervals may correspond to the plurality of first air inlets 211. That is, one of the liquid separation holes 330 corresponds to one of the first air inlets 211, so that the cold water sprayed from the liquid separation pipe 33 can flow into the corresponding first air inlet 211 through the plurality of liquid separation holes 330 arranged at intervals.

In some embodiments, the plurality of first air inlets 211 and the plurality of second air inlets 221 separated by the partition plate are in a shape of a "mouth", so that the design can prevent the air duct from deforming when the wind pressure is large, and ensure that each air inlet or each air outlet of the heat exchange core 2 cannot deform.

Further, as shown in fig. 4, the spraying device 3 further includes a plurality of liquid-dividing branches 34, and one liquid-dividing branch 34 corresponds to one liquid-dividing hole 330. Based on this, one end of the liquid separation branch pipe 34 communicates with the liquid separation hole 330, and the other end extends into the first air inlet 211 of the outdoor air flow path 21 so that cold water can flow into the outdoor air flow path.

On this basis, as shown in fig. 1, the spraying device 3 further includes a water collecting box 35, wherein the water collecting box 35 is disposed adjacent to the first air outlet 212 of the outdoor air flow channel 21, and the water collecting box 35 is used for collecting cold water so as to prevent the cold water from flowing into the casing 1 or the machine room.

In some embodiments of the present utility model, the outdoor air flow path 21 of the heat exchange core 2 extends in a first direction, and the indoor air flow path 22 extends in a second direction (see fig. 1). The first direction is perpendicular to the wall, and based on this, the first direction is perpendicular to the second direction.

In this way, the flow path design of the outdoor air flow path 21 and the indoor air flow path 22 can be simplified. The outdoor air flow channel 21 and the indoor air flow channel 22 are in a straight shape, the flow channel is designed to be at the path end, and the flow channel wind resistance can be reduced.

In some embodiments of the present utility model, the heat exchange core 2 may include a plurality of sub-cores 20, where the plurality of sub-cores 20 are provided with an outdoor air flow channel 21 and an indoor air flow channel 22. In this case, the plurality of sub-cores 20 are stacked in the third direction. The third direction is perpendicular to the first direction and also perpendicular to the second direction (see fig. 5).

Based on this, when the heat exchange core 2 is formed by stacking and splicing the plurality of sub-cores 20, the heat exchange efficiency of the outdoor cold air and the indoor hot air is more efficient, and the wind pressure resistance of the heat exchange core 2 is enhanced. In addition, when the heat exchange core body 2 is damaged, only the damaged sub-core body 20 is replaced, so that the heat exchange core body 2 is convenient to maintain in the later period.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. An external indirect evaporation air conditioning unit, its characterized in that, external indirect evaporation air conditioning unit is located the computer lab outside, external indirect evaporation air conditioning unit includes:

a housing having a receiving cavity; the shell is provided with an outdoor air inlet, an outdoor air outlet, an indoor air inlet and an indoor air outlet;

a heat exchange core located in the receiving cavity, the heat exchange core having:

a plurality of outdoor air flow passages penetrating through the heat exchange core; the outdoor air flow passage is provided with a first air inlet and a first air outlet which are opposite;

a plurality of indoor air flow passages penetrating through the heat exchange core; the indoor air flow passage is provided with a second air inlet and a second air outlet which are opposite, the outdoor air flow passage and the indoor air flow passage are arranged at intervals, and the outdoor air flow passage is not communicated with the indoor air flow passage;

the first fan is positioned in the accommodating cavity and is arranged adjacent to the indoor air outlet and used for inputting indoor air into the indoor air flow channel;

the second fan is positioned in the accommodating cavity and is arranged adjacent to the outdoor air inlet and used for inputting outdoor air into the outdoor air flow channel;

the evaporator is positioned in the accommodating cavity and is arranged at the indoor air inlet;

the condenser is positioned in the accommodating cavity and is arranged at the outdoor air outlet.

2. The external indirect evaporative air conditioning unit of claim 1, further comprising:

the spraying device is arranged at the first air inlet and can spray cold water into the outdoor air flow channel so as to cool air flow in the outdoor air flow channel.

3. The external indirect evaporative air conditioning unit according to claim 2, wherein the spraying device comprises:

a water storage box for storing cold water;

the water supply pipe is communicated with the water storage box and is used for supplying cold water for the water storage box;

the liquid distribution pipes are communicated with the water storage box, are arranged adjacent to the first air inlet of the outdoor air flow channel, and are provided with a plurality of liquid distribution holes at intervals towards one side of the first air inlet; one of the liquid separation pipes corresponds to one of the outdoor air flow passages.

4. The external indirect evaporative air conditioning unit according to claim 3, wherein the spraying device further comprises:

one end of each liquid-separating branch pipe is connected with each liquid-separating hole, and the other end of each liquid-separating branch pipe extends into the first air inlet so that cold water flows into the outdoor air flow channel, and one liquid-separating branch pipe corresponds to one liquid-separating hole.

5. The external indirect evaporative air conditioning unit according to claim 2, wherein the spray device further comprises:

and the water collecting box is arranged adjacent to the first air outlet of the outdoor air flow channel and is used for collecting the cold water.

6. The external indirect evaporative air conditioning unit of claim 1, further comprising:

an exhaust duct having a first end and a second end, the first end being in communication with indoor air, the second end extending outdoors and the second end being in communication with the indoor air inlet;

the return air pipe is provided with a third end and a fourth end, the third end extends to the outside of the room and is communicated with the indoor air outlet, and the fourth end is communicated with indoor air.

7. The external indirect evaporative air conditioning unit according to claim 1, wherein,

the outdoor air flow channel extends along a first direction, the indoor air flow channel extends along a second direction, and the first direction is perpendicular to a machine room wall; the first direction is perpendicular to the second direction.

8. The external indirect evaporative air conditioning unit according to claim 7, wherein,

the heat exchange core body comprises a plurality of sub-core bodies, wherein the outdoor air flow channel and the indoor air flow channel are respectively arranged on the plurality of sub-core bodies, the plurality of sub-core bodies are arranged in a stacked mode along a third direction, and the third direction is perpendicular to the first direction and is perpendicular to the second direction.

9. The external indirect evaporative air conditioning unit according to claim 4, wherein,

a plurality of partition boards are arranged in one outdoor air flow channel at intervals, and the plurality of partition boards divide a plurality of first air inlets; a plurality of partition plates are arranged in the indoor air flow passage at intervals, and the plurality of partition plates divide a plurality of second air inlets; one of the liquid-separating branch pipes corresponds to one of the first air inlets.

10. The external indirect evaporative air conditioning unit of claim 1, further comprising:

the filter screen is arranged at the outdoor wind inlet.