Indirect evaporative cooling device with closed precooling

Abstract

The present invention discloses a closed pre-cooling indirect evaporative cooling device, in which a first exhaust fan and a spray device are arranged in a chassis, a water tank is arranged below the filler, a first surface cooler is arranged between the filler and the water tank, a first outlet pipe of the water tank is connected to the primary side of the plate heat exchanger, and its outlet pipe is connected to the spray device, the secondary side of the plate heat exchanger is connected to the inlet of the first surface cooler, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger; or a closed coil is arranged on the air outlet side of the first surface cooler, and the outlet pipe of the closed coil is connected to the inlet of the first surface cooler, and its outlet pipe is connected to the inlet of the closed coil, and the outlet pipe of the water tank is connected to the spray device. The present invention has a reasonable structure, and the two-stage pre-cooling surface coolers of the indirect evaporative chiller can realize closed operation, avoiding the safety hazards brought by the open water system, improving the safety of winter use, making full use of outdoor low-temperature air, saving energy and water, and reducing the ineffective heat loss of the plate heat exchanger.

Description

Technical Field

[0001] The invention belongs to air handling equipment in the field of heating, ventilation and air conditioning, in particular to a closed pre-cooling indirect evaporative cooling device. Background Art

[0002] The open air conditioning cold water system is in direct contact with the outdoor atmosphere, so the water quality of the air conditioning system has certain problems. For example, suspended matter in the outdoor air enters the system and causes the heat exchange equipment to be blocked. As the water in the air conditioning system continues to evaporate and concentrate, calcium and magnesium ions in the water precipitate to form sediments, causing the air conditioning system water pipelines and the pipelines in the heat exchange equipment to be blocked, affecting the heat exchange efficiency. In addition, oxygen corrosion in the system causes corrosion of the pipelines to form iron oxides, which also causes the pipelines or heat exchange equipment to be blocked. In order to solve the above problems, adding a plate heat exchanger unit in the air conditioning system can basically solve the above problems.

[0003] Indirect evaporative chillers use surface heat exchangers to precool outdoor air to reduce the dry-bulb and wet-bulb temperatures of fresh air. The water inlet to the surface heat exchanger is generally the cold water taken by the indirect evaporative chiller and the return water from the users of the air-conditioning system. Generally, if the cold water taken by the indirect evaporative chiller is used to precool the outdoor air, the outdoor air temperature will drop significantly. However, since the open cold water taken by the indirect evaporative chiller directly enters the surface heat exchanger for heat exchange, the heat exchange coil of the surface heat exchanger is easily clogged, which results in a decrease in the heat exchange efficiency of the surface heat exchanger in summer and makes it easier for the heat exchange coil to be frozen in winter. Summary of the invention

[0004] The purpose of the present invention is to provide an indirect evaporative cooling device with closed pre-cooling, which has a reasonable structure. The two-stage pre-cooling surface coolers of the indirect evaporative chiller can both realize closed operation, avoid the safety hazards brought by the open water system, improve the safety of winter use, make full use of outdoor low-temperature air, save energy and water, and reduce the ineffective heat loss of the plate heat exchanger.

[0005] The object of the present invention is achieved as follows: a closed pre-cooling indirect evaporative cooling device, a first exhaust fan and a spray device are arranged above the filler in the chassis, a water tank is arranged below the filler, a first air inlet is arranged between the filler and the water tank, and a first surface cooler is installed on it, a first outlet pipe of the water tank is connected to the inlet of the primary side of the plate heat exchanger through a first circulation pump, and its outlet pipe is connected to the spray device, and the outlet pipe of the secondary side of the plate heat exchanger is connected to the inlet of the first surface cooler through a second circulation pump and a user, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger; or a closed coil is arranged on the air outlet side of the first surface cooler, and the outlet pipe of the closed coil is connected to the inlet of the first surface cooler through a second circulation pump and a user, and its outlet pipe is connected to the inlet of the closed coil, and the outlet pipe of the water tank is connected to the spray device through the first circulation pump.

[0006] The present invention realizes closed operation of the user-side cold medium, and the two-stage pre-cooling surface coolers of the indirect evaporative water chiller can both realize closed operation, thus avoiding the safety hazards brought by the open water system; at the same time, the pre-cooling surface cooler of the indirect evaporative water chiller pre-cools the outdoor fresh air through the cold medium, and the cold medium can be water or antifreeze; by adding a second exhaust fan and a dry cooling surface cooler, the user-side circulation system of the indirect evaporative water chiller will not freeze when the indirect evaporative water chiller is operated in winter, and by shutting down the spray water system of the indirect evaporative water chiller, the water consumption for the whole year operation is reduced; the cold water taken by the indirect evaporative water chiller is sequentially connected in series for the air-conditioning user and the condenser of the mechanical refrigeration unit, and while the cooling capacity of the cold water is fully released, the air-conditioning safety is higher.

[0007] advantage:

[0008] 1. The indirect evaporative chiller surface cooler pre-cools the outdoor fresh air in a closed manner, and the surface cooler coil will not be blocked, which is highly safe;

[0009] 2. The cooling medium circulating on the secondary side of the plate heat exchanger is water or antifreeze, which improves the safety of winter use;

[0010] 3. Add natural cooling surface cooler and second exhaust fan in winter to make full use of low-temperature outdoor air and save energy and water;

[0011] 4. By switching the air valve and water valve, the indirect evaporative chiller can be operated all year round;

[0012] 5. Add mechanical refrigeration units and use the cold water of indirect evaporative chillers as cooling water for the mechanical refrigeration units. The user's cold water is further cooled by the mechanical refrigeration units, which improves the safety of air conditioning.

[0013] 6. Closed coils can be used to achieve closed operation of cold water on the user side, reducing the ineffective heat loss of the plate heat exchanger.

[0014] The present invention has a reasonable structure, and the two-stage pre-cooling surface coolers of the indirect evaporative chiller can realize closed operation, avoiding the potential safety hazards brought by the open water system, improving the safety of winter use, making full use of outdoor low-temperature air, saving energy and water, and reducing the ineffective heat loss of the plate heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings. Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention. Figure 2 This is a structural diagram of Embodiment 2 of the present invention. Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention. Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the present invention. Figure 5 This is a structural diagram of Embodiment 5 of the present invention. Figure 6This is a structural diagram of Embodiment 6 of the present invention. Figure 7 This is a structural diagram of Embodiment 7 of the present invention. Figure 8 This is a schematic diagram of the structure of Embodiment 8 of the present invention. Fig. 9 This is a schematic diagram of the structure of Example 9 of the present invention. Fig.10 This is a schematic diagram of the structure of Embodiment 10 of the present invention. Fig.11 This is a schematic diagram of the structure of Embodiment 11 of the present invention. Fig.12 This is a schematic diagram of the structure of Embodiment 12 of the present invention. Fig.13 This is a schematic diagram of the structure of Embodiment 13 of the present invention. Fig.14 This is a structural diagram of Embodiment 14 of the present invention. Fig.15 This is a structural diagram of Embodiment 15 of the present invention. Fig.16 This is a structural diagram of Embodiment 16 of the present invention. Fig.17 This is a structural diagram of Embodiment 17 of the present invention. Fig.18 This is a schematic diagram of the structure of Embodiment 18 of the present invention. Fig.19 This is a structural diagram of Embodiment 19 of the present invention. Fig. 20 This is a schematic diagram of the structure of Embodiment 20 of the present invention. Fig.21 This is a schematic diagram of the structure of Embodiment 21 of the present invention. Fig. 22 This is a schematic diagram of the structure of Embodiment 22 of the present invention. Fig.23 This is a schematic diagram of the structure of Embodiment 23 of the present invention. Fig.24 This is a schematic diagram of the structure of Embodiment 24 of the present invention. Fig.25 This is a schematic diagram of the structure of Embodiment 25 of the present invention. Fig.26 This is a schematic diagram of the structure of Example 26 of the present invention. Fig. 27 This is a schematic diagram of the structure of Embodiment 27 of the present invention. Fig.28 This is a structural schematic diagram of Example 28 of the present invention. DETAILED DESCRIPTION

[0016] A closed precooling indirect evaporative cooling device, such as Figure 1 , Fig.23As shown, a first exhaust fan 3 and a spray device 4 are arranged above the filler 2 in the chassis 1, a water tank 5 is arranged below the filler 2, a first air inlet 6 is arranged between the filler 2 and the water tank 5, and a first surface cooler 7 is installed on it, a first outlet pipe of the water tank 5 is connected to the inlet of the primary side of the plate heat exchanger 9 through a first circulation pump 8, and its outlet pipe is connected to the spray device 4, and the outlet pipe of the secondary side of the plate heat exchanger 9 is connected to the inlet of the first surface cooler 7 through a second circulation pump 10 and a user 11, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9; or a closed coil 37 is arranged on the air outlet side of the first surface cooler 7, and the outlet pipe of the closed coil 37 is connected to the inlet of the first surface cooler 7 through the second circulation pump 10 and the user 11, and its outlet pipe is connected to the inlet of the closed coil 37, and the outlet pipe of the water tank 5 is connected to the spray device 4 through the first circulation pump 8. The indirect evaporative cooling device comprises a first air inlet 6, a first surface cooler 7, a water tank 5, a filler 2 and a first exhaust fan 3. The cold water in the water tank 5 enters the primary side of the plate heat exchanger 9 through the first circulation pump 8. The return water on the primary side of the plate heat exchanger 9 is sprayed and cooled by the filler 2. The secondary side liquid outlet pipe of the plate heat exchanger 9 is connected to the air conditioner user 11 through the second circulation pump 10. The liquid outlet pipe of the user 11 is connected to the inlet of the first surface cooler 7. The outlet of the first surface cooler 7 is connected to the plate heat exchanger 9. The liquid inlet on the secondary side of the plate heat exchanger 9, wherein the cooling medium circulating on the primary side of the plate heat exchanger 9 is cold water, which is cooled by the filler 2, and the cooling medium circulating on the secondary side of the plate heat exchanger 9 can be water or antifreeze (such as ethylene glycol solution), and the antifreeze pre-cools the air entering the filler 2 through the first surface cooler 7. The cooling medium of the first surface cooler 7 is the closed antifreeze on the secondary side of the plate heat exchanger 9, which avoids the safety hazard of blockage of the first surface cooler coil caused by open cold water. In order to realize the closed operation of the indirect evaporative cold water supply device, a closed coil 37 is arranged on the air outlet side of the first surface cooler 7. The air whose temperature is reduced after passing through the first surface cooler 7 passes through the closed coil 37 to cool the cold medium. The low-temperature liquid outlet of the closed coil 37 is used for cooling the air-conditioning user 11 through the second circulation pump 10. The liquid outlet of the user 11 passes through the first surface cooler 7 to pre-cool the outdoor air. The liquid outlet of the first surface cooler 7 returns to the return liquid port of the closed coil 37 for cooling. The closed coil 37 is arranged below the packing 2. The cold medium in the closed coil 37 is cooled by the spray water and low-temperature air outside the coil, thereby avoiding the safety hazards of open cold water and the waste of cooling capacity caused by the conventional closed system using the plate heat exchanger 9.

[0017] like Figure 2As shown, a second cooler 12 is arranged on the air outlet side of the first cooler 7, and a bypass is arranged on the pipeline connecting the second circulation pump 10 to the user 11, the bypass is connected to the inlet of the second cooler 12, and its outlet pipe is connected to the inlet pipe of the first cooler 7. A second cooler 12 is provided on the air outlet side of the first cooler 7. The cold water in the water tank 5 enters the primary side of the plate heat exchanger 9 through the first circulation pump 8. The return water on the primary side of the plate heat exchanger 9 is sprayed and cooled by the filler 2. A portion of the liquid outlet pipe on the secondary side of the plate heat exchanger 9 enters the second cooler 12 through the second circulation pump 10, and a portion enters the air-conditioning user for refrigeration. The liquid outlet of the user 11 and the liquid outlet of the second cooler 12 are mixed and then enter the first cooler 7 to pre-cool the outdoor air for the first time. The outlet of the first cooler 7 is connected to the liquid inlet on the secondary side of the plate heat exchanger 9. The cooling medium in the first cooler 7 and the second cooler 12 are both antifreeze on the secondary side of the plate heat exchanger 9. The first cooler 7 and the second cooler 12 are both operated in a closed manner, avoiding the safety hazard of blockage of the heat exchange coil by open cold water.

[0018] like Figure 3 As shown, the outlet pipe of the second cooler 12 is connected to the outlet pipe of the first cooler 7. The cold water in the water tank 5 enters the primary side of the plate heat exchanger 9 through the first circulation pump 8, and the return water on the primary side of the plate heat exchanger 9 is sprayed and cooled by the filler 2. The secondary side liquid outlet pipe of the plate heat exchanger 9 enters the second cooler 12 through the second circulation pump 10, and the other part enters the air conditioner user 11 for refrigeration. The liquid outlet of the user 11 enters the first cooler 7 to pre-cool the outdoor air for the first time. The liquid outlets of the first cooler 7 and the second cooler 12 are both returned to the secondary side of the plate heat exchanger 9. The first cooler 7 and the second cooler 12 are both operated in a closed manner, avoiding the potential safety hazard of blockage of the heat exchange coil by open cold water.

[0019] like Figure 4 As shown, a bypass is provided on the pipeline connecting the first circulation pump 8 to the primary side inlet of the plate heat exchanger 9 , the bypass is connected to the inlet of the second surface cooler 12 , and its outlet pipe is connected to the spray device 4 . A second cooler 12 is arranged on the air outlet side of the first cooler 7. A part of the cold water in the water tank 5 enters the second cooler 12 through the first circulation pump 8, and the other part enters the primary side of the plate heat exchanger 9. The return water on the primary side of the plate heat exchanger 9 and the outlet water of the second cooler 12 are sprayed and cooled by the filler 2. The secondary side liquid outlet pipe of the plate heat exchanger 9 is connected to the air-conditioning user through the second circulation pump 10. The user's liquid outlet pipe is connected to the inlet of the first cooler 7. The outlet of the first cooler 7 is connected to the liquid inlet of the secondary side of the plate heat exchanger 9. The cooling medium precools the air entering the filler 2 for the first time through the first cooler 7. A part of the cold water in the water tank 5 precools the air entering the filler 2 for the second time through the second cooler 12. After two precoolings, the dry-bulb and wet-bulb temperatures of the air are lower, and the temperature of the produced cold water is lower.

[0020] like Figure 5 As shown, a wind box is arranged between the air outlet side of the first cooler 7 and the chassis 1, and a second exhaust fan 16 is arranged on the air outlet of the wind box. An air cavity is connected between the air outlet side of the first cooler 7 and the air inlet side of the second cooler 12, and a second air outlet 13 and a third air outlet 14 are arranged at the bottom and top of the air cavity, respectively. A fourth air outlet 15 is arranged obliquely in the air cavity. The outlet pipe of the user 11 is connected to the inlet of the second cooler 12, and its outlet pipe is connected to the inlet of the first cooler 7. The second cooler 12 is arranged on the air outlet side of the first cooler 7, and dry cooling in winter is achieved by arranging an air valve and a second exhaust fan 16. Operation condition 1: the second air outlet 13 and the third air outlet 14 and the second exhaust fan 16 are closed, the fourth air outlet 15 is closed, the outdoor air is cooled step by step through the first cooler 7 and the second cooler 12, the cooling medium after the user's heat exchange first enters the second cooler 12, the outlet of the second cooler 12 enters the first cooler 7, the outlet of the first cooler 7 returns to the secondary side of the plate heat exchanger 9, the temperature of the air cooled step by step is lower, and the outlet water temperature of the water tank 5 can be lower in summer; Operation condition 2: the second air outlet 13 and the third air outlet 14 and the first exhaust fan 3 and the second exhaust fan The machines 16 are all turned on, and the fourth air vent 15 is closed. The cooling medium after heat exchange with the user 11 first enters the second cooler 12, and the outdoor low-temperature air entering from the second air vent 13 is cooled. The air after heat exchange with the second cooler 12 is discharged by the first exhaust fan 3. The outlet liquid of the second cooler 12 further enters the first cooler 7, and the outdoor low-temperature air entering from the first air inlet 6 is further cooled. The air after heat exchange with the first cooler 7 is discharged by the second exhaust fan 16. The spray water system on the primary side of the plate heat exchanger 9 stops running, and only low-temperature air is used for dry cooling, which fully saves water.

[0021] like Figure 6As shown, a bypass is provided on the pipeline between the second circulation pump 10 and the inlet of the user 11, and the bypass is connected to the inlet of the second cooler 12, the outlet pipe of the user 11 is connected to the inlet of the first cooler 7, and the outlet pipe of the second cooler 12 is connected to the inlet pipe of the first cooler 7. By switching different air inlets, simultaneous cooling of the first cooler 7 and the second cooler 12 in winter and summer is achieved. Operation condition one: the second air inlet 13 and the third air inlet 14 are closed, and the fourth air inlet 15 is opened. The outdoor air enters through the first air inlet 6, and is pre-cooled by the first cooler 7 and the second cooler 12 in two stages, and cold water is produced by the filler 2; Operation condition two: the second air inlet 13 and the third air inlet 14 are opened, and the fourth air inlet 15 is closed. The outdoor low-temperature air enters through the first air inlet 6 and the second air inlet 13 respectively, and cools the cooling medium through the first cooler 7 and the second cooler 12. The air outlet of the first cooler 7 The air is discharged from the second exhaust fan 16 through the third air outlet 14, the air of the second surface cooler 12 enters through the second air outlet 13, and is discharged through the first exhaust fan 3 after passing through the filler 2. The circulation process of the antifreeze liquid is as follows: a part of the low-temperature cooling medium on the secondary side of the plate heat exchanger 9 passes through the second surface cooler 12, the cooling medium outlet of the second surface cooler 12 and the cooling medium with a relatively high temperature after heat exchange by the user 11 are mixed and then enter the first surface cooler 7, and the outlet of the first surface cooler 7 returns to the secondary side of the plate heat exchanger 9.

[0022] like Figure 7 As shown, a bypass is provided on the pipeline connecting the first circulation pump 8 to the primary inlet of the plate heat exchanger 9, the bypass is connected to the inlet of the second cooler 12, and its outlet pipe is connected to the spray device 4. The outlet pipe of the secondary side of the plate heat exchanger 9 is connected to the inlet of the first cooler 7 through the second circulation pump 10 and the user 11, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9. The second cooler 12 is provided on the outlet side of the first cooler 7. When operating in winter, the fourth air vent 15 is closed, and the outdoor air enters the first cooler 7 from the first air inlet 6. The cooling medium is cooled by the low-temperature air. The air is discharged from the third air vent 14 through the second exhaust fan 16. The outdoor air enters the second cooler 12 from the second air vent 13. The outlet air of the second cooler 12 passes through the filler 2 to produce cold water. The cold water enters the primary side of the plate heat exchanger 9 to further cool the cooling medium on the secondary side of the plate heat exchanger 9.

[0023] like Figure 8As shown, a bypass is arranged on the pipeline connecting the second circulation pump 10 to the inlet of the user 11, and the bypass is connected to the inlet of the second condenser 12 through the first valve 17. The outlet pipe of the user 11 is connected to the inlet of the first condenser 7 through the third valve 19, and is connected to the outlet of the second condenser 12 through the arranged bypass. A bypass is arranged on the outlet pipe of the user 11, and the bypass is connected to the bypass arranged on the outlet pipe of the second circulation pump 10 after the first valve 17 through the second valve 18. By setting valves to switch the different cooling medium circulation processes in winter and summer, operating condition 1: the second air outlet 13 and the third air outlet 14 are closed, the fourth air outlet 15 is opened, the second valve 18 is closed, the first valve 17 and the third valve 19 are opened, a part of the low-temperature cooling medium on the secondary side of the plate heat exchanger 9 enters the second surface cooler 12 to pre-cool the outdoor air for the second time, and the other part enters the air-conditioning user 11 for refrigeration. The outlet liquid of the user 11 passes through the third valve 19 and the outlet liquid of the second surface cooler 12 and then enters the first surface cooler 7 to pre-cool the outdoor air for the first time. The outlet liquid of the first surface cooler 7 returns to the plate heat exchanger 9. Secondary side cooling cycle of heat exchanger 9; operating condition two: the second air outlet 13 and the third air outlet 14 are opened, the fourth air outlet 15 is closed, the first valve 17 and the third valve 19 are closed, and the second valve 18 is opened. The outlet liquid of the secondary side of the plate heat exchanger 9 enters the air-conditioning user 11 for refrigeration through the second circulation pump 10. The outlet liquid of the user 11 first enters the second surface cooler 12 and is cooled by the outdoor low-temperature air. The outlet liquid of the second surface cooler 12 then enters the first surface cooler 7 and is cooled for the second time by the outdoor low-temperature air. The outlet liquid temperature of the first surface cooler 7 is reduced and returns to the secondary side of the plate heat exchanger 9 for refrigeration of the air-conditioning user.

[0024] like Fig. 9As shown, a bypass is provided on the pipeline connecting the second circulation pump 10 to the inlet of the user 11, and the bypass is connected to the inlet of the second cooler 12 through the first valve 17 and the tee, and the other interface of the tee is connected to the outlet pipe of the first cooler 7 through the second valve 18, and the outlet pipe of the user 11 is connected to the inlet of the first cooler 7. By setting valves, different circulation processes of the cooling medium in winter and summer are switched. Operating condition 1: the second air vent 13 and the third air vent 14 are closed, the fourth air vent 15 is opened, the second valve 18 is closed, the first valve 17 and the third valve 19 are opened, a part of the low-temperature cooling medium on the secondary side of the plate heat exchanger 9 enters the second cooler 12 to pre-cool the outdoor air for the second time, and the other part enters the air-conditioning user 11 for refrigeration, and the outlet liquid of the user 11 enters the first cooler 7 to pre-cool the outdoor air for the first time, and the outlet liquid of the first cooler 7 and the outlet liquid of the second cooler 12 are both returned to the plate heat exchanger 9 secondary side. Secondary side cooling cycle; operating condition two: the second air outlet 13 and the third air outlet 14 are opened, the fourth air outlet 15 is closed, the first valve 17 and the third valve 19 are closed, and the second valve 18 is opened. The outlet liquid of the secondary side of the plate heat exchanger 9 enters the air-conditioning user 11 for refrigeration through the second circulation pump 10. The outlet liquid of the user 11 first enters the first surface cooler 7 and is cooled by the outdoor low-temperature air. The outlet liquid of the first surface cooler 7 then enters the second surface cooler 12 and is cooled for the second time by the outdoor low-temperature air. The outlet liquid temperature of the second surface cooler 12 is reduced and returns to the secondary side of the plate heat exchanger 9 to be used for refrigeration of the air-conditioning user.

[0025] like Fig.10As shown, an air inlet box is provided between the air outlet side of the second cooler 12 and the air inlet of the chassis 1, and the sixth and seventh air outlets 21 and 22 are provided at the top and bottom of the air inlet box respectively, and the fifth air outlet 20 is provided at the air inlet of the chassis 1. The fifth and sixth air outlets are provided on the air outlet side of the second cooler. Operation condition one: the first exhaust fan 3 is turned off, the fourth air outlet 15, the fifth air outlet 20 and the seventh air outlet 22 are all turned off, the second air outlet 13, the third air outlet 14 and the sixth air outlet 21 are all turned on, the outdoor air first enters the second cooler 12 through the second air outlet 13 to cool the cooling medium after the user's heat exchange, the outdoor air is discharged from the sixth air outlet 21 through the second exhaust fan 16, the outdoor air is further cooled by the first air inlet 6 through the first cooler 7, the outdoor air is discharged from the third air outlet 14 through the second exhaust fan 16, and the cooling medium passes through the first cooler 7 and the second cooler 7. The cooling medium whose temperature is reduced after two-stage cooling by the cooler 12 is used for cooling the user 11. By setting the fifth air vent 20 and the sixth air vent 21, the air does not pass through the filler 2 during winter operation, thereby reducing the energy consumption of the exhaust fan during winter operation; operating condition two: the second air vent 13, the third air vent 14 and the second exhaust fan 16 are closed, the sixth air vent 21 is also closed, the fourth air vent 15 is opened, and the outdoor air is cooled step by step through the first surface cooler 7 and the second surface cooler 12; operating condition three: only the fifth air vent 20 and the seventh air vent 22 are opened, the first exhaust fan 3 is opened, and the outdoor air passes through the filler 2 to produce cold water.

[0026] like Fig.11 As shown, a bypass is provided on the pipeline connecting the second circulation pump 10 to the inlet of the user 11, the bypass is connected to the inlet of the second cooler 12, the outlet pipe of the user 11 is connected to the inlet of the first cooler 7, and the outlet pipe of the second cooler 12 is connected to the outlet pipe of the user 11. By switching different air inlets, the first cooler 7 and the second cooler 12 can cool simultaneously in winter and summer. Operation condition one: the second air outlet 13 and the third air outlet 14 are closed, the fourth air outlet 15 is opened, the sixth air outlet 21 and the seventh air outlet 22 are closed, and the fifth air outlet 20 is opened. The outdoor air enters through the first air inlet 6, passes through the two-stage pre-cooling of the first surface cooler 7 and the second surface cooler 12, and produces cold water through the filler 2; Operation condition two: only the fifth air outlet 20 and the seventh air outlet 22 are opened, the first exhaust fan 3 is turned on, and the outdoor air is cooled through the filler 2; Operation condition three: only the first air inlet 6 and the third air outlet 14 are opened, the second exhaust fan 16 is turned on, and the outdoor low-temperature air cools the cooling medium on the user side through the first surface cooler 7.

[0027] like Fig.12As shown, the outlet pipe of the user 11 is connected to the inlet of the first surface cooler 7, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9. A bypass is arranged on the pipeline connecting the first circulation pump 8 to the inlet of the primary side of the plate heat exchanger 9, and the bypass is connected to the inlet of the second surface cooler 12, and its outlet pipe is connected to the spray device 4. Operation condition one: the second, third, sixth and seventh air vents 13, 14, 21 and 22 are closed, the fourth and fifth air vents 15 and 20 are opened, the first exhaust fan 3 is opened, and the second exhaust fan 16 is closed. After the outdoor air is pre-cooled by the first surface cooler 7 and the second surface cooler 12, cold water is produced through the filler 2; Operation condition two: only the fifth air vent 20 and the seventh air vent 22 are opened, the first exhaust fan 3 is opened, and the outdoor air produces cold water through the filler 2, thereby reducing the operating energy consumption of the first exhaust fan 3; Operation condition three: the third air vent 14 is opened, and the other air vents are closed. The outdoor low-temperature air cools the user's required cooling medium in the first surface cooler 7 through the first air inlet 6, and the air is discharged through the second exhaust fan 16. At this time, the spray water system of the filler 2 is closed.

[0028] like Fig.13 As shown, a bypass is provided on the pipeline connecting the second circulation pump 10 to the inlet of the user 11, the bypass is connected to the inlet of the second cooler 12, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9, and the outlet pipe of the user 11 is connected to the inlet of the first cooler 7, and its outlet pipe is connected to the outlet pipe of the second cooler 12. The circulation process of the antifreeze liquid is as follows: a part of the low-temperature cooling medium on the secondary side of the plate heat exchanger 9 passes through the second cooler 12, and the cooling medium with a relatively high temperature after heat exchange by the user enters the first cooler 7, and the cooling medium in the first cooler 7 and the second cooler 12 cools the outdoor air in two stages, and the outlet liquids of the first cooler 7 and the second cooler 12 are returned to the secondary side of the plate heat exchanger 9.

[0029] like Fig.14As shown, the outlet pipe of the user 11 is connected to the inlet of the first cooler 7, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9. The second outlet pipe of the water tank 5 is connected to the inlet of the second cooler 12 through the third circulation pump 23. Its outlet pipe is connected to the spray device 4 through the three-way and the fourth valve 24. The other interface of the three-way is connected to the water tank 5 through the fifth valve 25. The outlet pipe of the primary side of the plate heat exchanger 9 is connected to the spray device 4 through the three-way and the sixth valve 26. The other interface of the three-way is connected to the water tank 5 through the seventh valve 27. A partition 28 is provided in the water tank 5 to separate the lower part of the water tank 5. The water level of the upper part is connected. The first and second outlet pipes of the water tank 5 are respectively connected to the water outlet of the water tank 5 separated by the partition 28. By providing air valves at the air inlets of the first cooler 7 and the second cooler 12, and providing water valves on the circulation pipeline, different operation modes in winter and summer are switched. During summer operation, the second air vent 13 and the third air vent 14 are closed, and the fourth air vent 15 is opened. The outdoor dry hot air first passes through the first surface cooler 7, is pre-cooled by the cooling medium that has been heat exchanged by the user, and then passes through the second surface cooler 12, and is pre-cooled by the low-temperature cold water in the water tank 5. A third circulation pump 23 is provided at the water inlet of the second surface cooler 12. The cooling medium whose temperature is increased through the heat exchange of the first surface cooler 7 returns to the secondary side of the plate heat exchanger 9, and the cold water whose temperature is increased through the heat exchange of the second surface cooler 12 returns to the packing 2 for spraying and cooling. The return water on the primary side of the plate heat exchanger 9 returns to the packing 2 for spraying and cooling. At this time, on the cooling medium circulation pipeline, the fourth valve 24 and the sixth valve 26 are opened, and the fifth valve 25 and the seventh valve 27 are closed. During winter or transitional season operation: the second air vent 13 and the third air vent 14 are opened, and the fourth The air vent 15 is closed, and the second exhaust fan 16 is turned on. The cooling medium with the increased temperature after the user heat exchange passes through the first surface cooler 7, is first cooled by the outdoor low-temperature air, and then returns to the secondary side of the plate heat exchanger 9. The water tank 5 is divided into two parts, the left and right parts, and the cold water circulation process on the primary side of the plate heat exchanger 9 is as follows: the return water temperature on the primary side of the plate heat exchanger 9 is the highest, and enters the right side of the water tank 5 through the seventh valve 27, enters the second surface cooler 12 through the third circulation pump 23 and is cooled by the outdoor low-temperature air, the cold water with reduced temperature enters the left side of the water tank 5 through the valve 25, and enters the primary side of the plate heat exchanger 9 through the first circulation pump 8. The low-temperature cold water is used to cool the cooling medium on the secondary side on the primary side of the plate heat exchanger 9. At this time, the fourth valve 24 and the sixth valve 26 are closed, and the fifth valve 25 and the seventh valve 27 are opened on the water circulation pipeline. In winter and summer operation, the flow and lift of the third circulation pump 23 are inconsistent, so the third circulation pump 23 is set as a variable frequency pump to facilitate flexible adjustment of the flow and lift of the water pump.

[0030] like Fig.15As shown, the outlet pipe of the user 11 is connected to the inlet of the first cooler 7, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9. The outlet pipe of the first circulation pump 8 is connected to the inlet of the primary side of the plate heat exchanger 9 through a tee. The other interface pipe of the tee is connected to the inlet of the second cooler 12 through the sixth valve 26, and its outlet pipe is connected to the spray device 4 through the fourth valve 24. The outlet pipe of the water tank 5 is connected to the outlet pipe of the second cooler 12 located behind the fourth valve 24 through the fifth valve 25. The outlet pipe of the primary side of the plate heat exchanger 9 is connected to the spray device 4 through the set tee and the eighth valve 29, and the other interface pipe of the tee is connected to the inlet pipe of the second cooler 12 through the seventh valve 27. By setting air valves at the air inlets of the first cooler 7 and the second cooler 12, and setting water valves on the circulation pipeline, different operation modes in winter and summer can be switched. Under this switching mode, the system operation can be realized by using the first circulation pump 8 in both winter and summer. Operation condition one: the second air vent 13 and the third air vent 14 are closed, and the fourth air vent 15 is opened. The cold water in the water tank 5 passes through the first circulation pump 8, and a part enters the second surface cooler 12, and the other part enters the primary side of the plate heat exchanger 9. The outdoor dry hot air first passes through the first surface cooler 7, is pre-cooled by the cold medium that has exchanged heat with the user 11, and then passes through the second surface cooler 12, and is pre-cooled by the low-temperature cold water in the water tank 5. The cold medium with a higher temperature after heat exchange in the first surface cooler 7 returns to the secondary side of the plate heat exchanger 9, and the cold water with a higher temperature after heat exchange in the second surface cooler 12 returns to the packing 2 for spray cooling. The return water on the primary side of the plate heat exchanger 9 returns to the packing 2 for spray cooling. At this time, on the cold medium circulation pipeline, the fourth valve 24, the sixth valve 26, and the eighth valve 29 are opened, and the fifth valve 25, the sixth valve 26, and the eighth valve 29 are opened. The seventh valve 27 is closed; operating condition two: the second air outlet 13 and the third air outlet 14 are opened, the fourth air outlet 15 is closed, and the second exhaust fan 16 is turned on. The cooling medium whose temperature is increased by heat exchange with the user 11 passes through the first surface cooler 7, is first cooled by the outdoor low-temperature air, and then returns to the secondary side of the plate heat exchanger 9. The cold water circulation process on the primary side of the plate heat exchanger 9 is as follows: the outlet water temperature on the primary side of the plate heat exchanger 9 is the highest, and the outlet water on the primary side enters the second surface cooler 12 through the seventh valve 27, and is cooled by the outdoor low-temperature air in the second surface cooler 12. The cold water with reduced temperature enters the primary side of the plate heat exchanger 9 through the fifth valve 25 using the first circulation pump 8, and the low-temperature cold water is used to cool the cooling medium on the secondary side on the primary side of the plate heat exchanger 9. At this time, on the water circulation pipeline, the fourth valve 24, the sixth valve 26, and the eighth valve 29 are closed, and the fifth valve 25 and the seventh valve 27 are opened.

[0031] like Fig.16As shown, a wind box is arranged on the air inlet side of the chassis 1, a first air inlet 6 is arranged on the wind box, a first surface cooler 7 is arranged on the first air inlet 6, an air inlet box is arranged between the air inlet side of the chassis 1 and the air outlet side of the first surface cooler 7, a sixth and seventh air inlets 21 and 22 are arranged on the top and bottom of the air inlet box respectively, and a fifth air inlet 20 is arranged at the air inlet of the chassis 1. Operation condition 1: the sixth air inlet 21 and the seventh air inlet 22 are closed, the fifth air inlet 20 is opened, the outdoor air is pre-cooled through the first surface cooler 7, and then enters the packing cooling spray water through the fifth air inlet 20; Operation condition 2: the fifth air inlet 20 and the seventh air inlet 22 are opened, the sixth air inlet 21 is closed, and the outdoor air directly enters the packing cooling spray water to produce cold water; Operation condition 3: the fifth air inlet 20 and the seventh air inlet 22 are closed, the sixth air inlet 21 is opened, the second exhaust fan 16 is opened, and the outdoor low-temperature air cools the user-side cooling medium through the first surface cooler 7.

[0032] like Fig.17 As shown, the primary side outlet pipe of the plate heat exchanger 9 is connected to the cooling water inlet of the mechanical refrigeration unit 30, and its outlet pipe is connected to the spray device 4. The chilled water outlet pipe of the mechanical refrigeration unit 30 is connected to the inlet of the first surface cooler 7 through the second circulation pump 10 and the user 11. The secondary side outlet pipe of the plate heat exchanger 9 is connected to the chilled water inlet of the mechanical refrigeration unit 30. The water outlet of the primary side of the plate heat exchanger 9 is connected to the inlet of the cooling water of the mechanical refrigeration unit 30. The cooling water outlet of the mechanical refrigeration unit 30 is sprayed and cooled through the filler 2. The outlet of the chilled water side of the mechanical refrigeration unit 30 is connected to the inlet of the air-conditioning user 11 through the second circulating pump 10. The liquid outlet of the user 11 is connected to the inlet of the first surface cooler 7. The liquid outlet of the first surface cooler 7 is connected to the inlet of the secondary side of the plate heat exchanger 9. The outlet pipe of the secondary side of the plate heat exchanger 9 is connected to the chilled water inlet of the mechanical refrigeration unit 30. The cooling medium circulating between the secondary side of the plate heat exchanger 9 and the chilled water side of the mechanical refrigeration unit 30 is antifreeze. By adding the mechanical refrigeration unit 30, the safety of the user's air conditioning is more guaranteed.

[0033] like Fig.18As shown, the outlet pipe on the primary side of the plate heat exchanger 9 is connected to the cooling water inlet of the mechanical refrigeration unit 30 through a tee, the cooling water outlet pipe of the mechanical refrigeration unit 30 is connected to the spray device 4, the other interface pipe of the tee is connected to the cooling water outlet pipe of the mechanical refrigeration unit 30 through a ninth valve 31, the secondary side outlet pipe of the plate heat exchanger 9 is connected to the chilled water inlet of the mechanical refrigeration unit 30, the chilled water outlet pipe of the mechanical refrigeration unit 30 is connected to the inlet of the first surface cooler 7 through the tee, the second circulating pump 10 and the user 11, wherein the other interface of the tee is connected to the outlet pipe on the secondary side of the plate heat exchanger 9 through a tenth valve 32. By adjusting the ninth valve 31, a part of the water outlet from the primary side of the plate heat exchanger 9 is used as cooling water for the mechanical refrigeration unit 30, and the other part returns to the packing 2 for spraying and cooling. The cooling water outlet of the mechanical refrigeration unit 30 returns to the packing 2 for spraying and cooling. By adjusting the tenth valve 32, a part of the water outlet from the secondary side of the plate heat exchanger 9 enters the chilled water side of the mechanical refrigeration unit 30 for further cooling. The other part of the cold water is mixed with the chilled water outlet of the mechanical refrigeration unit 30 and then supplied to the air-conditioning users. In this system process, part of the mechanical refrigeration unit 30 is configured to make full use of the indirect evaporative cold water supply device to produce cold water, and the mechanical refrigeration unit 30 only plays a role in supplementary refrigeration.

[0034] like Fig.19 As shown, the exhaust pipe of the first exhaust fan 3 is connected to the air inlet of the outdoor unit heat exchanger 33 of the air-cooled mechanical refrigeration unit, and the refrigerant inlet and outlet pipes of the outdoor unit heat exchanger 33 are connected to the indoor unit heat exchanger 34. The condenser of the air-cooled mechanical refrigeration unit is arranged at the air outlet of the first exhaust fan 3, and the indirect evaporative cold water supply device is combined with the air-cooled mechanical refrigeration unit. The air temperature after heat exchange by the filler 2 is still relatively low, and is sent to the air-cooled condenser of the air-cooled mechanical refrigeration unit through the first exhaust fan 3, thereby improving the energy efficiency of the air-cooled refrigeration unit.

[0035] like Fig. 20As shown, a bellows having an eighth air inlet 35 and an air outlet is disposed on the upper portion of the first cooler 7, a third cooler 36 is disposed on the eighth air inlet 35, and a second exhaust fan 16 is disposed on the air outlet. The outlet pipe of the first cooler 7 is connected to the inlet of the third cooler 36, and the outlet pipe thereof is connected to the inlet of the secondary side of the plate heat exchanger 9. A third surface cooler 36 is added, and an eighth air inlet is provided on the air inlet side corresponding to the third surface cooler 36. A second exhaust fan 16 is provided on the air outlet side of the third surface cooler 36. The main purpose of adding the third surface cooler 36 is: when the indirect evaporative cooling water supply device is operated in winter, the spray water system on the primary side of the plate heat exchanger 9 is closed, and only the outdoor low-temperature air is used to cool the high-temperature cooling medium on the user's liquid outlet side through the first surface cooler 7 and the first exhaust fan 3. When the refrigeration capacity is insufficient, the third surface cooler 36 and the second exhaust fan 16 are added to assist in refrigeration. The liquid outlet of the first surface cooler 7 enters the third surface cooler 36 for further cooling, and the low-temperature cooling medium passes through the secondary side of the plate heat exchanger 9 and enters the user for refrigeration.

[0036] like Fig.21 As shown, a second cooler 12 is arranged on the air outlet side of the first cooler 7, and its outlet pipe is connected to the outlet pipe of the user 11. A bypass is arranged on the connecting pipe between the second circulating pump 10 and the user 11, and the bypass is connected to the inlet of the second cooler 12. A third cooler 36 is added, and an eighth air inlet is provided on the air inlet side of the third cooler 36. A second exhaust fan 16 is arranged on the air outlet side of the third cooler 36. The purpose of adding the third cooler 36 is mainly: when the indirect evaporative cold water supply device is operated in winter, the spray water system on the primary side of the plate heat exchanger 9 is closed, and only the outdoor low-temperature air is used to cool the high-temperature cooling medium on the user's liquid outlet side through the first cooler 7, the second cooler 12 and the first exhaust fan 3. The cooling capacity is insufficient, and the third cooler 36 and the second exhaust fan 16 are added to assist in cooling. The liquid outlet of the first cooler 7 enters the third cooler for further cooling, and the low-temperature cooling medium passes through the secondary side of the plate heat exchanger 9 and enters the user for cooling.

[0037] like Fig. 22 As shown, a bypass is provided on the pipeline connecting the first circulation pump 8 to the primary inlet of the plate heat exchanger 9, the bypass is connected to the inlet of the second cooler 12, and its outlet pipe is connected to the spray device 4. The outlet pipe of the secondary side of the plate heat exchanger 9 is connected to the inlet of the first cooler 7 through the second circulation pump 10 and the user 11. The second cooler 12 is mainly used to pre-cool the outdoor air in summer through the open cold water of the water tank 5. In winter, the spray water system on the primary side of the plate heat exchanger 9 is closed, and the outdoor low-temperature air cools the cooling medium through the first cooler 7 and the third cooler 36.

[0038] like Fig.24As shown, the closed coil 37 is arranged in the water tank 5 at the lower part of the air outlet side of the first surface cooler 7. The closed coil 37 can be arranged in the water tank 5, which can play a role in antifreeze protection for the water in the water tank 5. During winter operation, the user's liquid first passes through the first surface cooler 7, and the liquid of the first surface cooler 7 enters the side of the closed coil 37 close to the bottom of the water tank 5. The liquid outlet side of the closed coil 37 is close to the upper part of the water tank 5. The liquid outlet temperature of the closed coil 37 is reduced, and is used for cooling the user 11 through the second circulation pump 10.

[0039] like Fig.25 As shown, the user 11 is a unit equipped with a high-temperature condenser 39 and a low-temperature condenser 40. The outlet pipe of the second circulating pump 10 is connected to the inlet of the user's high-temperature condenser 39, and its outlet pipe is connected to the inlet of the first condenser 7. The outlet pipe of the first condenser 7 is connected to the inlet of the secondary side of the plate heat exchanger 9. The outlet pipe of the user's low-temperature condenser 40 is connected to the cooling water inlet of the air-cooled mechanical refrigeration unit 38, and its cooling water outlet pipe is connected to the inlet of the low-temperature condenser 40. The indirect evaporative cooling water supply device is combined with an air-cooled mechanical refrigeration unit. The user 11 includes a high-temperature surface cooler 39 and a low-temperature surface cooler 40. The high-temperature cooling medium on the secondary side of the plate heat exchanger 9 is used for pre-cooling the air by the high-temperature surface cooler 39, and the low-temperature cooling medium produced by the air-cooled mechanical refrigeration unit is used for further cooling the air by the low-temperature surface cooler 40. The air temperature is reduced after two-stage cooling and is sent to the air-conditioned area. During part of the year, only the indirect evaporative cooling water supply device can be used to meet the user's cooling needs. When this is done, the air-cooled mechanical refrigeration unit is turned off to reduce system energy consumption.

[0040] like Fig.26 As shown, the first exhaust fan 3 is connected to the air inlet of the condenser of the air-cooled mechanical refrigeration unit 38 through an exhaust pipe. The indirect evaporative cold water supply device is combined with the air-cooled mechanical refrigeration unit 38, and the exhaust of the indirect evaporative cold water supply device leads to the condenser of the air-cooled mechanical refrigeration unit 38. The user 11 includes a high-temperature surface cooler 39 and a low-temperature surface cooler 40. The high-temperature cooling medium on the secondary side of the plate heat exchanger 9 is used for pre-cooling the air in the high-temperature surface cooler 39, and the low-temperature cooling medium prepared by the air-cooled mechanical refrigeration unit 38 is used for further cooling the air in the low-temperature surface cooler 40. The air temperature is reduced after two-stage cooling and sent to the air-conditioned area. In some time periods throughout the year, only the indirect evaporative cold water supply device can meet the user's cooling needs, and the air-cooled mechanical refrigeration unit 38 is turned off to reduce system energy consumption.

[0041] like Fig. 27As shown, the closed coil 37 is arranged at the lower part of the air outlet side of the first surface cooler 7, and is located above the water tank 5. After the outdoor air is cooled by the first surface cooler 7, cold water is produced by the filler 2. The cold water cools the cooling medium in the closed coil 37 on the outside of the closed coil 37. The cooling medium in the coil and the cold water outside the coil realize closed heat exchange. The cooled cooling medium is used for user cooling. The user's outlet liquid enters the first surface cooler 7 to cool the air. According to needs, when the outlet liquid temperature of the closed coil 37 is relatively high and cannot meet the user's cooling requirements, the outlet liquid of the coil can be further cooled by the mechanical refrigeration unit. After the temperature is further reduced, it is used for user cooling, thereby improving the user's air conditioning safety.

[0042] like Fig.28 As shown, an air duct is provided between the air outlet side of the first surface cooler 7 and the air inlet of the packing 2 of the indirect evaporative cold water supply device, and a second air vent 13 is provided on the bottom surface of the air duct. By closing the second air vent 13, fresh air enters the packing 2 to produce cold water after being precooled by the first surface cooler 7. In part of the time period, by opening the second air vent 13, fresh air directly enters the packing 2 to produce cold water through the second air vent 13, thereby reducing the exhaust resistance of the first exhaust fan 7 and reducing energy consumption throughout the year.

Claims

1. A closed pre-cooling indirect evaporative cooling device, comprising: a first exhaust fan (3) and a spray device (4) are arranged above a filler (2) in a case (1); a water tank (5) is arranged below the filler (2); a first air inlet (6) is arranged between the filler (2) and the water tank (5); a first surface cooler (7) is installed on the first air inlet (6); a first outlet pipe of the water tank (5) is connected to the inlet of the primary side of a plate heat exchanger (9) through a first circulation pump (8); the outlet pipe of the water tank (5) is connected to the spray device (4); the outlet pipe of the secondary side of the plate heat exchanger (9) is connected to the inlet of the primary side of the plate heat exchanger (9) through a second circulation pump (10) and the user (11) are connected to the inlet of the first cooler (7), and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9); or a closed coil (37) is arranged on the air outlet side of the first cooler (7), and the outlet pipe of the closed coil (37) is connected to the inlet of the first cooler (7) through the second circulation pump (10) and the user (11), and its outlet pipe is connected to the inlet of the closed coil (37), and the outlet pipe of the water tank (5) is connected to the spray device (4) through the first circulation pump (8), Its characteristics are: A wind box is arranged between the air outlet side of the first surface cooler (7) and the chassis (1), and a second exhaust fan (16) is arranged on the air outlet of the wind box. An air cavity is connected between the air outlet side of the first surface cooler (7) and the air inlet side of the second surface cooler (12) in the wind box, and a second air port (13) and a third air port (14) are arranged at the bottom and the top of the air cavity respectively. A fourth air port (15) is arranged obliquely in the air cavity. The outlet pipe of the user (11) is connected to the inlet of the second surface cooler (12), and its outlet pipe is connected to the inlet of the first surface cooler (7); the outlet pipe of the primary side of the plate heat exchanger (9) is connected to the cooling water inlet of the mechanical refrigeration unit (30) through a tee, and the cooling water outlet pipe of the mechanical refrigeration unit (30) is connected to the spray device (4). Another interface pipe of the tee is connected to the cooling water outlet pipe of the mechanical refrigeration unit (30) through a ninth valve (31). The secondary side outlet pipe of the heat exchanger (9) is connected to the chilled water inlet of the mechanical refrigeration unit (30), and the chilled water outlet pipe of the mechanical refrigeration unit (30) is connected to the inlet of the first condenser (7) through a tee, a second circulation pump (10) and a user (11), wherein the other interface of the tee is connected to the secondary side outlet pipe of the plate heat exchanger (9) through a tenth valve (32); the user (11) is a unit provided with a high-temperature condenser (39) and a low-temperature condenser (40), the outlet pipe of the second circulation pump (10) is connected to the inlet of the user's high-temperature condenser (39), and its outlet pipe is connected to the inlet of the first condenser (7), the outlet pipe of the first condenser (7) is connected to the secondary side inlet of the plate heat exchanger (9), the outlet pipe of the user's low-temperature condenser (40) is connected to the cooling water inlet of the air-cooled mechanical refrigeration unit (38), and its cooling water outlet pipe is connected to the inlet of the low-temperature condenser (40).

2. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A second cooler (12) is arranged on the air outlet side of the first cooler (7), and a bypass is arranged on the pipeline connecting the second circulation pump (10) to the user (11), the bypass is connected to the inlet of the second cooler (12), and its outlet pipe is connected to the inlet pipe of the first cooler (7).

3. The closed precooling indirect evaporative cooling device according to claim 2, Its characteristics are: The outlet pipe of the second condenser (12) is connected to the outlet pipe of the first condenser (7).

4. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A bypass is provided on the pipeline connecting the first circulation pump (8) to the primary side inlet of the plate heat exchanger (9), the bypass is connected to the inlet of the second surface cooler (12), and its outlet pipe is connected to the spray device (4).

5. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A bypass is provided on the pipeline between the second circulation pump (10) and the inlet of the user (11), the bypass is connected to the inlet of the second cooler (12), the outlet pipe of the user (11) is connected to the inlet of the first cooler (7), and the outlet pipe of the second cooler (12) is connected to the inlet pipe of the first cooler (7).

6. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A bypass is provided on the pipeline connecting the first circulation pump (8) to the primary side inlet of the plate heat exchanger (9), the bypass is connected to the inlet of the second surface cooler (12), and its outlet pipe is connected to the spray device (4); the outlet pipe of the secondary side of the plate heat exchanger (9) is connected to the inlet of the first surface cooler (7) through the second circulation pump (10) and the user (11), and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9).

7. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A bypass is provided on the pipeline connecting the second circulation pump (10) to the inlet of the user (11), and the bypass is connected to the inlet of the second cooler (12) through a first valve (17). The outlet pipe of the user (11) is connected to the inlet of the first cooler (7) through a third valve (19), and is connected to the outlet of the second cooler (12) through the provided bypass. A bypass is provided on the outlet pipe of the user (11), and the bypass is connected to the bypass provided on the outlet pipe of the second circulation pump (10) after the first valve (17) through a second valve (18).

8. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A bypass is provided on the pipeline connecting the second circulation pump (10) to the inlet of the user (11), and the bypass is connected to the inlet of the second cooler (12) through the first valve (17) and the tee, and the other interface of the tee is connected to the outlet pipe of the first cooler (7) through the second valve (18), and the outlet pipe of the user (11) is connected to the inlet of the first cooler (7).

9. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: An air inlet box is arranged between the air outlet side of the second surface cooler (12) and the air inlet of the chassis (1), a sixth air inlet (21, 22) is arranged at the top and bottom of the air inlet box respectively, and a fifth inlet (20) is arranged at the air inlet of the chassis (1).

10. The closed precooling indirect evaporative cooling device according to claim 9, Its characteristics are: A bypass is provided on the pipeline connecting the second circulation pump (10) to the inlet of the user (11), the bypass is connected to the inlet of the second cooler (12), the outlet pipe of the user (11) is connected to the inlet of the first cooler (7), and the outlet pipe of the second cooler (12) is connected to the outlet pipe of the user (11).

11. The closed precooling indirect evaporative cooling device according to claim 9, Its characteristics are: The outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7), and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9). A bypass is arranged on the pipeline connecting the first circulation pump (8) to the inlet of the primary side of the plate heat exchanger (9), and the bypass is connected to the inlet of the second surface cooler (12), and its outlet pipe is connected to the spray device (4).

12. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A bypass is provided on the pipeline connecting the second circulation pump (10) to the inlet of the user (11), the bypass is connected to the inlet of the second cooler (12), and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9), the outlet pipe of the user (11) is connected to the inlet of the first cooler (7), and its outlet pipe is connected to the outlet pipe of the second cooler (12).

13. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: The outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7), and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9). The second outlet pipe of the water tank (5) is connected to the inlet of the second surface cooler (12) through the third circulation pump (23). The outlet pipe is connected to the spray device (4) through a three-way connection and a fourth valve (24). The other interface of the three-way connection is connected to the water tank (5) through a fifth valve (25). The outlet pipe of the primary side of the plate heat exchanger (9) is connected to the spray device (4) through a three-way connection and a sixth valve (26). The other interface of the three-way connection is connected to the water tank (5) through a seventh valve (27). A partition (28) is provided in the water tank (5) to separate the lower part of the water tank (5) and connect the water level of the upper part. The first and second outlet pipes of the water tank (5) are respectively connected to the water outlet of the water tank (5) separated by the partition (28).

14. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: The outlet pipe of the user (11) is connected to the inlet of the first cooler (7), and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9). The outlet pipe of the first circulation pump (8) is connected to the inlet of the primary side of the plate heat exchanger (9) through a tee. The other interface pipe of the tee is connected to the inlet of the second cooler (12) through a sixth valve (26). Its outlet pipe is connected to the spray device (4) through a fourth valve (24). The outlet pipe of the water tank (5) is connected to the outlet pipe of the second cooler (12) located behind the fourth valve (24) through a fifth valve (25). The outlet pipe of the primary side of the plate heat exchanger (9) is connected to the spray device (4) through a tee and an eighth valve (29). The other interface pipe of the tee is connected to the inlet pipe of the second cooler (12) through a seventh valve (27).

15. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A wind box is arranged on the air inlet side of the chassis (1), a first air inlet (6) is arranged on the wind box, a first surface cooler (7) is arranged on the first air inlet (6), an air inlet box is arranged between the air inlet side of the chassis (1) and the air outlet side of the first surface cooler (7), a sixth and a seventh air inlet (21, 22) are arranged at the top and bottom of the air inlet box respectively, and a fifth inlet (20) is arranged at the air inlet of the chassis (1).

16. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: The primary side outlet pipe of the plate heat exchanger (9) is connected to the cooling water inlet of the mechanical refrigeration unit (30), and its outlet pipe is connected to the spray device (4). The chilled water outlet pipe of the mechanical refrigeration unit (30) is connected to the inlet of the first surface cooler (7) through the second circulation pump (10) and the user (11). The secondary side outlet pipe of the plate heat exchanger (9) is connected to the chilled water inlet of the mechanical refrigeration unit (30).

17. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: The exhaust pipe of the first exhaust fan (3) is connected to the air inlet of the outdoor unit heat exchanger (33) of the air-cooled mechanical refrigeration unit, and the refrigerant inlet and outlet pipes of the outdoor unit heat exchanger (33) are connected to the indoor unit heat exchanger (34).

18. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: A wind box having an eighth air inlet (35) and an air outlet is arranged on the upper part of the first cooler (7), a third cooler (36) is arranged on the eighth air inlet (35), and a second exhaust fan (16) is arranged on the air outlet. The outlet pipe of the first cooler (7) is connected to the inlet of the third cooler (36), and the outlet pipe thereof is connected to the inlet of the secondary side of the plate heat exchanger (9).

19. The closed precooling indirect evaporative cooling device according to claim 18, Its characteristics are: A second cooler (12) is arranged on the air outlet side of the first cooler (7), and its outlet pipe is connected to the outlet pipe of the user (11). A bypass is arranged on the connecting pipe between the second circulation pump (10) and the user (11), and the bypass is connected to the inlet of the second cooler (12).

20. The closed precooling indirect evaporative cooling device according to claim 19, Its characteristics are: A bypass is provided on the pipeline connecting the first circulation pump (8) to the primary inlet of the plate heat exchanger (9), the bypass is connected to the inlet of the second surface cooler (12), and its outlet pipe is connected to the spray device (4). The outlet pipe of the secondary side of the plate heat exchanger (9) is connected to the inlet of the first surface cooler (7) through the second circulation pump (10) and the user (11).

21. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: The closed coil (37) is arranged in a water tank (5) at the lower part of the air outlet side of the first surface cooler (7).

22. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: The first exhaust fan (3) is connected to the air inlet of the condenser of the air-cooled mechanical refrigeration unit (38) through an exhaust pipe.

23. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: The closed coil (37) is arranged at the lower part of the air outlet side of the first surface cooler (7) and is located above the water tank (5).

24. The closed precooling indirect evaporative cooling device according to claim 1, Its characteristics are: An air duct is arranged between the air outlet side of the first surface cooler (7) and the air inlet of the filler (2) of the indirect evaporative cold water supply device, and a second air outlet (13) is arranged on the bottom surface of the air duct.

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