Combined refrigerating system and refrigerating method

Abstract

The invention belongs to the field of energy-saving air conditioners, and particularly relates to a combined refrigerating system and a refrigerating method.The combined refrigerating system comprises an air duct which is fixedly installed at the top of a machine room; the exhaust fan is fixedly installed at the bottom of the air duct and communicates with the interior of the air duct, and heat in the machine room is introduced into the air duct through the exhaust fan and exhausted outdoors; the shell is fixed to the outer side of the exhaust fan, the bottom of the shell is of an open structure, a through groove used for air inflow is formed in the side wall of the shell, a refrigeration assembly is arranged in the shell, and the machine room is refrigerated and cooled through the refrigeration assembly; through combined refrigeration of the cooling water coil pipe, the evaporative cooling coil pipe and other structures, the refrigeration effect is improved; and in addition, condensate water formed on the pipe wall is conveniently collected and cleaned through the condensate water collecting assembly, the situation that the condensate water falls onto equipment, and consequently the equipment is damaged is avoided, in addition, automatic cleaning of the condensate water is effectively achieved, and the maintenance workload is reduced.

Description

Technical Field

[0001] The invention belongs to the field of energy-saving air conditioners, and in particular relates to a combined refrigeration system and a refrigeration method. Background Art

[0002] Because the computer room contains a large number of electronic equipment, an air conditioning system is needed to cool it down so that the computer room is at a suitable working temperature.

[0003] Patent document CN101126529A discloses a machine room air conditioning unit, the technical solution of which is as follows: it includes an indoor air conditioner and a chiller, the chiller is connected to the indoor air conditioner, the chiller is used to provide chilled water for the indoor air conditioner, and includes a compressor, a condensing coil, an expansion valve and an evaporator connected end to end in sequence, the centrifugal fan, a static pressure box and an air outlet of the indoor air conditioner are connected in sequence, the air outlet is located at the lower part of the indoor air conditioner, and the return air outlet is located at the uppermost part of the machine room; the chiller also includes a natural cooling heat exchange coil and a three-way regulating valve, one end of the natural cooling heat exchange coil is connected to the chilled water return pipe of the air conditioning system, and the other end is connected to the three-way regulating valve and the evaporator in sequence, and the other end of the three-way regulating valve is connected to the chilled water return bypass pipe of the air conditioning system. The invention can optimize the airflow and temperature distribution in the machine room, thereby obtaining the best heat exchange effect, and save energy by increasing the supply air temperature and the supply and return air temperature difference, and adopts the natural cooling technical solution, which greatly improves the energy saving effect.

[0004] However, the above technologies often have the following defects: the outdoor unit adopts natural cold source cooling, and the indoor unit adopts traditional chilled water unit. Due to the limitation of water supply temperature of indoor air-conditioning unit, the utilization time of natural cold source is short, and the combined cooling mode cannot be formed, resulting in poor cooling effect.

[0005] To this end, the present invention provides a combined refrigeration system and a refrigeration method. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a combined refrigeration system described in the present invention comprises: An air duct, wherein the air duct is fixedly installed on the top of the machine room; An exhaust fan, which is fixedly mounted at the bottom of the air duct and communicated with the interior of the air duct, and through which the heat inside the machine room is introduced into the air duct and discharged to the outdoors; A shell, the shell is fixed to the outside of the exhaust fan, the bottom of the shell is an open structure, the side wall of the shell is provided with a through slot for air intake, and a refrigeration component is provided inside the shell, and the refrigeration component is used to cool and reduce the temperature of the machine room; The refrigeration component includes a cooling water coil and an evaporative cooling coil. The cooling water coil is arranged below the exhaust fan, and the evaporative cooling coil is arranged below the cooling water coil. The cooling water coil and the evaporative cooling coil are respectively connected to an external water supply component.

[0008] Preferably, the cooling water coil and the evaporative cooling coil are fixedly installed at an angle below the exhaust fan.

[0009] Preferably, it also includes a condensate collection component, which includes a water guide groove, which is fixedly connected to the bottom of the cooling water coil and the evaporative cooling coil through a fixed block, and extends along the pipeline direction of the cooling water coil and the evaporative cooling coil, and the cross-section of the water guide groove is set to be V-shaped.

[0010] Preferably, a water collecting trough is fixed on the lower end side wall of the water guide trough, and the side wall of the water collecting trough is provided with a water guide hole connected to the water guide trough, and the end of the water collecting trough away from the water guide hole is set to be conical, and a fixed pipe is fixedly connected in the middle of the conical part, and a connecting pipe is sleeved on the outer side of the end of the fixed pipe, and the end of the connecting pipe is fixedly connected to a water collecting cylinder, and the connecting pipe is connected to the inside of the water collecting cylinder.

[0011] Preferably, a sponge column is installed inside the water collecting cylinder, and an outer protrusion is provided on the top of the sponge column.

[0012] Preferably, a through hole is provided in the middle of the bottom of the water collecting cylinder, a breathable and waterproof membrane is installed inside the through hole, and a cavity is provided in the middle of the sponge column.

[0013] Preferably, the water supply assembly includes a three-way valve 1, a three-way valve 2 and a condenser, the first channel of the three-way valve 1 is connected to the water supply port, the second channel of the three-way valve 1 is connected to the water inlet end of the cooling water coil, the water outlet end of the cooling water coil is connected to the third channel of the three-way valve 1, and the water outlet end of the cooling water coil is connected to the first channel of the three-way valve 2, the second channel of the three-way valve 2 is connected to the first inlet of the condenser, the first outlet of the condenser is connected to the third channel of the three-way valve 2, and the first outlet of the condenser is connected to the return water port, the second inlet of the condenser is connected to a compressor, the compressor is connected to the outlet end of the evaporative cooling coil, and the second outlet of the condenser is connected to the inlet end of the evaporative cooling coil.

[0014] Preferably, the water supply port and the water return port are both connected to an outdoor cooling tower or a dry cooler.

[0015] Preferably, a throttling device is connected between the second outlet of the condenser and the inlet end of the evaporative cooling coil.

[0016] A combined refrigeration method, which is applicable to the combined refrigeration system mentioned above, comprises the following steps: S1. Start the exhaust fan to exhaust the hot air in the room, accelerate the indoor air circulation, and achieve initial heat dissipation. S2, cooling water enters the cooling water coil through the water supply port and three-way valve 1, and flows back to the return port through three-way valve 2, so that the cooling water circulates in the cooling water coil, and the hot air inside the computer room rises to the vicinity of the cooling water coil for heat exchange, achieving further cooling and cooling the inside of the computer room; S3, cooling water enters three-way valve 2, part of it flows to the return water port, and the other part flows to the condenser, the cooling water is cooled by the condenser and the compressor, and the cooling water is introduced into the evaporative cooling coil for circulation, and finally discharged from the return water port, so that the cooling water coil and the evaporative cooling coil can work together to achieve joint refrigeration, and the refrigeration effect is better; S4, by setting a water guide groove under the cooling water coil and the evaporative cooling coil to collect the condensed water formed on the surface of the two, and guide the condensed water into the water collecting groove, and finally collect the condensed water through the water collecting cylinder; S5. By setting up a sponge column to absorb condensed water, the airflow can accelerate the volatilization of water in the sponge column when it flows through the shell, effectively realizing the automatic cleaning of condensed water and reducing the maintenance workload.

[0017] The beneficial effects of the present invention are as follows: 1. The combined refrigeration system and refrigeration method described in the present invention, by arranging structures such as air ducts, exhaust fans, cooling water coils, evaporative cooling coils, and water supply components, the hot air inside the computer room is discharged from the air duct to the outdoors through the exhaust fan, thereby accelerating the indoor air circulation, achieving preliminary heat dissipation at natural temperature, and accelerating the air flow through the natural exhaust fan for pre-cooling. If the pre-cooling effect is not good, cooling water is then sent to the cooling water coil through the water supply component, and the hot air inside the computer room rises to the vicinity of the cooling water coil for heat exchange, thereby achieving further refrigeration and cooling the inside of the computer room; in addition, the evaporative cooling coil is used to further improve the refrigeration and cooling effect, and the cooling water coil and the evaporative cooling coil can be used for combined refrigeration, so that the refrigeration effect is better, and the use time of the natural cold source is extended, thereby reducing the energy consumption of the computer room air conditioner.

[0018] 2. The combined refrigeration system and refrigeration method described in the present invention, by providing a condensed water collection component to deal with the condensed water droplets formed on the surface of the cooling water coil and the evaporative cooling coil during the refrigeration process, and by providing a water guide groove at the bottom to further prevent the condensed water from dripping onto the equipment below, the condensed water gathers in the water guide groove, flows downward along the water guide groove, and finally flows into the water collecting cylinder to be collected; the sponge column inside the water collecting cylinder absorbs the condensed water, and the air flow can accelerate the volatilization of water in the sponge column during the process of flowing through the shell, thereby effectively realizing the automatic cleaning of the condensed water and reducing the maintenance workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 is a stereogram of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 yes Figure 2 A partial enlarged view of the middle part; Figure 4 is a partial cross-sectional view of the present invention; Figure 5 yes Figure 4 A partial enlarged view of point B in the middle; Figure 6 It is a schematic diagram of the structure of the condensate collection assembly of the present invention; Figure 7 It is a schematic diagram of cooling water flow of the present invention; Figure 8 It is a schematic flow chart of the method of the present invention.

[0021] In the figure: 1. air duct; 2. shell; 3. through groove; 4. exhaust fan; 5. cooling water coil; 6. evaporative cooling coil; 7. water guide groove; 8. water collecting groove; 9. water guide hole; 10. fixed pipe; 11. water collecting cylinder; 12. through hole; 13. breathable and waterproof membrane; 14. sponge column; 15. cavity; 16. connecting pipe; 17. external protrusion; 18. fixed block; 19. water supply port; 20. water return port; 21. three-way valve one; 22. three-way valve two; 23. condenser; 24. compressor; 25. throttling device. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0023] Embodiment 1: Figures 1 to 7 As shown, a combined refrigeration system according to an embodiment of the present invention includes: Air duct 1, the air duct 1 is fixedly installed on the top of the machine room; An exhaust fan 4 is fixedly mounted at the bottom of the air duct 1 and communicated with the interior of the air duct 1. The exhaust fan 4 introduces the heat inside the machine room into the air duct 1 and exhausts it to the outdoors; A shell 2, wherein the shell 2 is fixed to the outside of the exhaust fan 4, the bottom of the shell 2 is an open structure, the side wall of the shell 2 is provided with a through slot 3 for air intake, and a refrigeration component is provided inside the shell 2, and the refrigeration component is used to cool and reduce the temperature of the machine room; The refrigeration assembly includes a cooling water coil 5 and an evaporative cooling coil 6. The cooling water coil 5 is arranged below the exhaust fan 4, and the evaporative cooling coil 6 is arranged below the cooling water coil 5. The cooling water coil 5 and the evaporative cooling coil 6 are respectively connected to an external water supply assembly; During operation, the exhaust fan is started, and the hot air inside the computer room is discharged from the air duct 1 to the outdoors through the exhaust fan 4, so as to accelerate the indoor air circulation and achieve preliminary heat dissipation at natural temperature. The air flow is accelerated by the natural exhaust fan for pre-cooling. If the pre-cooling effect is not good, the cooling water is sent to the cooling water coil 5 through the water supply component, and the hot air inside the computer room rises to the vicinity of the cooling water coil 5 for heat exchange to achieve further cooling and cool down the inside of the computer room. In addition, the cooling water is sent to the evaporative cooling coil 6 through the water supply component at the same time, and the relevant compression cooling facilities are cooperated to further improve the cooling and cooling effect. The cooling water coil 5 and the evaporative cooling coil 6 can be cooled jointly, so that the cooling effect is better, and the use time of the natural cold source is extended, and the energy consumption of the computer room air conditioner is reduced.

[0024] The cooling water coil 5 and the evaporative cooling coil 6 are fixedly installed at an angle below the exhaust fan 4. When working, condensed water droplets may form on the surfaces of the cooling water coil 5 and the evaporative cooling coil 6 during the refrigeration process. By setting the two at an angle, the condensed water droplets can flow downward along the pipe wall under the influence of gravity and are finally collected and processed, thereby preventing the condensed water from dripping onto the equipment below and causing damage to the equipment.

[0025] It also includes a condensed water collection component, which includes a water guide groove 7. The water guide groove 7 is fixedly connected to the bottom of the cooling water coil 5 and the evaporative cooling coil 6 through a fixed block 18, and extends along the pipeline direction of the cooling water coil 5 and the evaporative cooling coil 6. The cross-section of the water guide groove 7 is set to be V-shaped; when working, the condensed water is further prevented from dripping onto the equipment below by arranging the water guide groove 7 below. When the condensed water contacts the fixed block 18, it can flow into the water guide groove 7 collected by the fixed block 18 and flow downward along the water guide groove 7.

[0026] A water collecting trough 8 is fixed on the lower end side wall of the water guide trough 7, and a water guide hole 9 connected to the water guide trough 7 is provided on the side wall of the water collecting trough 8. The end of the water collecting trough 8 away from the water guide hole 9 is set to be conical, and a fixed pipe 10 is fixedly connected in the middle of the conical part. A connecting pipe 16 is sleeved on the outer side of the end of the fixed pipe 10, and a water collecting cylinder 11 is fixedly connected to the end of the connecting pipe 16, and the connecting pipe 16 is connected to the inside of the water collecting cylinder 11; when working, condensed water flows into the water collecting trough 8 along the water guide trough 7, and then flows into the water collecting cylinder 11 through the fixed pipe 10 and the connecting pipe 16 to be collected; the connecting pipe 16 and the fixed pipe 10 are plugged into each other to quickly disassemble and assemble the water collecting cylinder 11, which is convenient for cleaning the condensed water inside the water collecting cylinder 11.

[0027] A sponge column 14 is installed inside the water collecting cylinder 11, and an outer protrusion 17 is provided on the top of the sponge column 14. When working, the sponge column 14 absorbs condensed water, and the airflow flows through the shell 2, which can accelerate the volatilization of water in the sponge column 14, effectively realize the automatic cleaning of condensed water, and reduce the maintenance workload; the outer protrusion 17 can expand the contact area between the sponge column 14 and the airflow, thereby accelerating the volatilization of water.

[0028] A through hole 12 is provided in the middle of the bottom of the water collecting cylinder 11, and a breathable and waterproof membrane 13 is installed on the inner side of the through hole 12. A cavity 15 is provided in the middle of the sponge column 14. During operation, the breathable and waterproof membrane 13 allows gas to pass through and prevents condensed water from dripping downward. When airflow enters from the bottom of the shell 2, the airflow can enter the cavity 15 in the middle of the sponge column 14 from the through hole 12, further increasing the contact area and thereby improving the water volatilization rate.

[0029] The water supply assembly includes a three-way valve 21, a three-way valve 22 and a condenser 23, the first channel of the three-way valve 21 is connected to the water supply port 19, the second channel of the three-way valve 21 is connected to the water inlet end of the cooling water coil 5, the water outlet end of the cooling water coil 5 is connected to the third channel of the three-way valve 21, and the water outlet end of the cooling water coil 5 is connected to the first channel of the three-way valve 22, the second channel of the three-way valve 22 is connected to the first inlet of the condenser 23, the first outlet of the condenser 23 is connected to the third channel of the three-way valve 22, and the first outlet of the condenser 23 is connected to the return water port 20, the second inlet of the condenser 23 is connected to a compressor 24, the compressor 24 is connected to the outlet end of the evaporative cooling coil 6, and the second outlet of the condenser 23 is connected to the inlet end of the evaporative cooling coil 6. Connection; during operation, when the cooling water coil 5 needs to work, the cooling water enters the cooling water coil 5 through the water supply port 19 and the three-way valve one 21, and flows back to the return water port 20 through the three-way valve two 22, so that the cooling water circulates in the cooling water coil 5, and the hot air inside the machine room rises to the vicinity of the cooling water coil 5 for heat exchange, thereby achieving further refrigeration and cooling the inside of the machine room; when the evaporative cooling coil 6 needs to work, the cooling water enters the three-way valve two 22, a part of it flows to the return water port 20, and the other part flows to the condenser 23, and the cooling water is cooled by the condenser 23 and the compressor 24, and the cooling water is introduced into the evaporative cooling coil 6 for circulation, and finally discharged from the return water port 20, so that the cooling water coil 5 and the evaporative cooling coil 6 can work together to achieve joint refrigeration, and the refrigeration effect is better.

[0030] The water supply port 19 and the water return port 20 are both connected to an outdoor cooling tower or a dry cooler; when working, a cooling tower or a dry cooler of the same specification continuously provides cooling water to the device, thereby realizing the recycling of cooling water.

[0031] Embodiment 2: Figure 7 As shown, in contrast to Example 1, another embodiment of the present invention is that a throttling device 25 is connected between the second outlet of the condenser 23 and the inlet end of the evaporative cooling coil 6; during operation, the flow rate and pressure of the cooling water in the pipeline are controlled by setting the throttling device 25.

[0032] like Figure 8 As shown, a combined refrigeration method, which is applicable to the above-mentioned combined refrigeration system, comprises the following steps: S1, start the exhaust fan 4, exhaust the hot air inside the computer room through the exhaust fan 4, accelerate the indoor air circulation, and achieve preliminary heat dissipation; S2, cooling water enters the cooling water coil 5 through the water supply port 19 and the three-way valve 1 21, and flows back to the return port 20 through the three-way valve 2 22, so that the cooling water circulates in the cooling water coil 5, and the hot air inside the machine room rises to the vicinity of the cooling water coil 5 for heat exchange, thereby achieving further refrigeration and cooling the inside of the machine room; S3, the cooling water enters the three-way valve 22, a part of it flows to the return port 20, and the other part flows to the condenser 23, the cooling water is cooled by the condenser 23 and the compressor 24, and the cooling water is introduced into the evaporative cooling coil 6 for circulation, and finally discharged from the return port 20, so that the cooling water coil 5 and the evaporative cooling coil 6 can work together to achieve joint refrigeration, and the refrigeration effect is better; S4, by setting a water guide trough 7 below the cooling water coil 5 and the evaporative cooling coil 6 to collect the condensed water formed on the surfaces of the two, and guide the condensed water into the water collecting trough 8, and finally collect the condensed water through the water collecting cylinder 11; S5. By arranging the sponge column 14 to absorb the condensed water, the airflow can accelerate the volatilization of the water in the sponge column 14 during the flow through the shell 2, thereby effectively realizing the automatic cleaning of the condensed water and reducing the maintenance workload.

[0033] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A combined refrigeration system, characterized in that: include: An air duct (1), wherein the air duct (1) is fixedly installed on the top of the machine room; An exhaust fan (4), the exhaust fan (4) being fixedly mounted at the bottom of the air duct (1) and in communication with the interior of the air duct, and the heat inside the machine room is introduced into the air duct (1) and discharged to the outdoors through the exhaust fan (4); A shell (2), the shell (2) being fixed to the outside of the exhaust fan (4), the bottom of the shell (2) being an open structure, the side wall of the shell (2) being provided with a through slot (3) for air intake, the inside of the shell (2) being provided with a refrigeration component, and the refrigeration component being used to cool and lower the temperature of the machine room; The refrigeration component comprises a cooling water coil (5) and an evaporative cooling coil (6); the cooling water coil (5) is arranged below the exhaust fan (4); the evaporative cooling coil (6) is arranged below the cooling water coil (5); and the cooling water coil (5) and the evaporative cooling coil (6) are respectively connected to an external water supply component.

2. A combined refrigeration system according to claim 1, characterized in that: The cooling water coil (5) and the evaporative cooling coil (6) are fixedly installed at an angle below the exhaust fan (4).

3. A combined refrigeration system according to claim 2, characterized in that: It also includes a condensed water collection component, the condensed water collection component including a water guide groove (7), the water guide groove (7) being fixedly connected to the bottom of the cooling water coil (5) and the evaporative cooling coil (6) through a fixing block (18), and extending along the pipeline direction of the cooling water coil (5) and the evaporative cooling coil (6), and the cross section of the water guide groove (7) is set to be V-shaped.

4. A combined refrigeration system according to claim 3, characterized in that: A water collecting groove (8) is fixed on the lower side wall of the water guide groove (7), and a water guide hole (9) communicating with the water guide groove (7) is provided on the side wall of the water collecting groove (8). The end of the water collecting groove (8) away from the water guide hole (9) is set to be conical, and a fixed pipe (10) is fixedly connected to the middle of the conical part. A connecting pipe (16) is sleeved on the outer side of the end of the fixed pipe (10), and a water collecting cylinder (11) is fixedly connected to the end of the connecting pipe (16), and the connecting pipe (16) is communicated with the inside of the water collecting cylinder (11).

5. A combined refrigeration system according to claim 4, characterized in that: A sponge column (14) is installed inside the water collecting cylinder (11), and an outer protrusion (17) is provided on the top of the sponge column (14).

6. A combined refrigeration system according to claim 5, characterized in that: A through hole (12) is provided in the middle of the bottom of the water collecting cylinder (11), a breathable and water-proof membrane (13) is installed inside the through hole (12), and a cavity (15) is provided in the middle of the sponge column (14).

7. A combined refrigeration system according to claim 6, characterized in that: The water supply assembly comprises a three-way valve (21), a three-way valve (22) and a condenser (23); the first port of the three-way valve (21) is connected to the water supply port (19); the second port of the three-way valve (21) is connected to the water inlet end of the cooling water coil (5); the water outlet end of the cooling water coil (5) is connected to the third port of the three-way valve (21); and the water outlet end of the cooling water coil (5) is connected to the first port of the three-way valve (22); the three-way valve (22) is connected to the water outlet end of the cooling water coil (5). The second port of the condenser (23) is connected to the first inlet of the condenser (23), the first outlet of the condenser (23) is connected to the third port of the three-way valve (22), the first outlet of the condenser (23) is connected to the water return port (20), the second inlet of the condenser (23) is connected to the compressor (24), the compressor (24) is connected to the outlet end of the evaporative cooling coil (6), and the second outlet of the condenser (23) is connected to the inlet end of the evaporative cooling coil (6).

8. A combined refrigeration system according to claim 7, characterized in that: The water supply port (19) and the water return port (20) are both connected to an outdoor cooling tower or a dry cooler.

9. A combined refrigeration system according to claim 8, characterized in that: A throttling device (25) is connected between the second outlet of the condenser (23) and the inlet end of the evaporative cooling coil (6).

10. A combined refrigeration method, the method adopting a combined refrigeration system according to claim 9, characterized in that: The following steps are involved: S1, starting the exhaust fan (4), exhausting the hot air inside the computer room through the exhaust fan (4), accelerating the indoor air circulation, and achieving initial heat dissipation; S2, cooling water enters the cooling water coil (5) through the water supply port (19) and the three-way valve 1 (21), and flows back to the return port (20) through the three-way valve 2 (22), so that the cooling water circulates in the cooling water coil (5), and the hot air inside the machine room rises to the vicinity of the cooling water coil (5) for heat exchange, thereby achieving further cooling and cooling the inside of the machine room; S3, the cooling water enters the three-way valve 2 (22), a part of which flows to the return water port (20), and the other part flows to the condenser (23), the cooling water is cooled by the condenser (23) and the compressor (24), and the cooling water is introduced into the evaporative cooling coil (6) for circulation, and finally discharged from the return water port (20), so that the cooling water coil (5) and the evaporative cooling coil (6) can work together to achieve joint refrigeration, and the refrigeration effect is better; S4, by providing a water guide groove (7) below the cooling water coil (5) and the evaporative cooling coil (6) to collect condensed water formed on the surfaces of the two, and guiding the condensed water into the water collecting groove (8), and finally collecting the condensed water through the water collecting cylinder (11); S5. By arranging a sponge column (14) to absorb condensed water, the volatilization of water in the sponge column (14) can be accelerated during the process of airflow passing through the shell (2), thereby effectively realizing automatic cleaning of condensed water and reducing maintenance workload.

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