Anti-freezing Indirect Evaporative Cooling Air Conditioning System for Data Center

Abstract

The present invention belongs to an air handling device in the field of heating, ventilation and air conditioning, in particular to an anti-freezing indirect evaporative cooling air conditioning system for a data center, which is composed of an evaporative refrigeration water supply device, a heat preservation space and a water storage device. The heat preservation space is composed of an upper heat preservation surface, a lower heat preservation surface and a side heat preservation surface. The evaporative refrigeration water supply device is placed on the upper heat preservation surface. A water storage device is arranged in the heat preservation space. The evaporative refrigeration water supply device is communicated with the water storage device through a connecting pipe. The water storage device is provided with a water outlet pipe. The cold water produced by the evaporative refrigeration water supply device flows into the water storage device through the connecting pipe. The water in the water storage device is supplied to users through the water outlet pipe and returns to the unit through the unit water inlet pipe. The structure of the present invention is reasonable, which can solve the anti-freezing problem of outdoor water pipelines in winter in the data center, and can also store water without additionally setting a water storage tank.

Description

Technical Field

[0001] The present invention belongs to an air handling device in the field of heating, ventilation and air conditioning, and particularly relates to an anti-freezing indirect evaporative cooling air conditioning system for a data center. Background Art

[0002] With the development of the 5G technology, a new round of rapid development of data centers has begun. At the same time, the scale of a single data center in China has also developed from hundreds of square meters at the beginning to thousands or even tens of thousands of square meters at present. With the continuous development of computer technology, the computer room, as a platform for the safe and stable operation of computers, has also developed accordingly.

[0003] Along with the development of data centers, the problem of high energy consumption in data centers has become increasingly prominent; in the energy consumption ratio of data centers, the air conditioning energy consumption accounts for 20%-30% of the total energy consumption. Therefore, reducing the air conditioning energy consumption is a very important means to reduce the energy consumption of data centers; in order to reduce the air conditioning energy consumption, the common method is to build data centers in northern regions and utilize the characteristics of low temperature and dryness in northern regions to extend the natural cooling time of data centers and reduce the PUE of data centers.

[0004] Generally, in order to reduce the energy consumption of the air conditioning system in a data center, the air conditioning system in a data center usually uses a conventional water-cooled mechanical refrigeration system, or adopts a water evaporation cooling system in areas with suitable climates to improve the energy efficiency ratio of the air conditioning system; in winter in northern China, although the low-temperature air can be directly used to extract chilled water, there is also a phenomenon of freezing and cracking of outdoor water pipelines, which directly affects the safe operation of the data center.

[0005] In order to solve the phenomenon of freezing and cracking of outdoor water pipelines in winter, the conventional method is to install electric tracing on the water pipelines and the pipelines of cooling equipment. Although electric tracing solves the risk of freezing and cracking of water pipelines to a certain extent, it also increases the installed power and power consumption of the air conditioning system, resulting in that when the air conditioning system uses natural cooling, the energy consumption of the air conditioning system does not decrease. Summary of the Invention

[0006] The purpose of the present invention is to provide an anti-freezing indirect evaporative cooling air conditioning system for a data center, which has a reasonable structure, can solve the anti-freezing problem of outdoor water pipelines in a data center in winter, and can also store water without additionally setting a water storage tank.

[0007] The object of the present invention is achieved as follows: An anti-freezing indirect evaporative cooling air conditioning system for a data center is composed of an evaporative refrigeration water supply device, a heat preservation space, and a water storage device. The heat preservation space is composed of an upper heat preservation surface, a lower heat preservation surface, and a side heat preservation surface. The evaporative refrigeration water supply device is placed on the upper heat preservation surface. A water storage device is arranged in the heat preservation space. The evaporative refrigeration water supply device is communicated with the water storage device through a connecting pipe. The water storage device is provided with a water outlet pipe. The cold water produced by the evaporative refrigeration water supply device flows into the water storage device through the connecting pipe. The water in the water storage device is supplied to users through the water outlet pipe and returns to the unit through the unit water inlet pipe.

[0008] The present invention solves the problem of anti-freezing of outdoor water pipelines in winter. Usually, the evaporative cooling equipment for producing cold water outdoors in winter is placed on the equipment platform, and the water pipelines are usually arranged under the platform. Therefore, the space under the equipment platform can be enclosed, and duty heating is carried out in the enclosed space to ensure that the pipelines under the platform will not freeze; in order to avoid the freezing of the equipment water tank, a water tank is arranged under the equipment platform, and only a water receiving tray is arranged inside the equipment. The water in the water receiving tray directly flows into the water tank. The water tank is arranged in a closed space, so there is no risk of freezing; the make-up water of the evaporative cooling equipment is directly arranged in the heat exchange machine room and replenished through the system, and there is no need to replenish water for the unit separately, solving the problem of anti-freezing of the make-up water system. Beneficial effects

[0009] 1. Effectively solves the problem of anti-freezing of outdoor water pipelines in the data center in winter;

[0010] 2. The water tank can not only be used as an anti-freezing device, but also store water. Therefore, the system does not need to be additionally provided with a water storage tank;

[0011] The present invention has a reasonable structure, solves the problem of anti-freezing of outdoor water pipelines in the data center in winter, and can also store water without additionally setting a water storage tank. Brief description of the drawings

[0012] The present invention will be further described below in conjunction with the drawings. Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention. Figure 2 It is a schematic structural diagram of Embodiment 2 of the present invention. Figure 3 It is a schematic structural diagram of Embodiment 3 of the present invention. Figure 4 It is a schematic structural diagram of Embodiment 4 of the present invention. Figure 5 It is a schematic structural diagram of Embodiment 5 of the present invention. Figure 6 It is a schematic structural diagram of Embodiment 6 of the present invention. Figure 7 It is a schematic structural diagram of Embodiment 7 of the present invention. Figure 8 It is a schematic structural diagram of Embodiment 8 of the present invention. Figure 9 It is a schematic structural diagram of Embodiment 9 of the present invention. Figure 10 It is a schematic structural diagram of Embodiment 10 of the present invention. Figure 11Schematic diagram of Structure of Embodiment 11 of the present invention Figure 12 Schematic diagram of Structure of Embodiment 12 of the present invention Figure 13 Schematic diagram of Structure of Embodiment 13 of the present invention Figure 14 Schematic diagram of Structure of Embodiment 14 of the present invention Figure 15 Schematic diagram of Structure of Embodiment 15 of the present invention Figure 16 Schematic diagram of Structure of Embodiment 16 of the present invention Figure 17 Schematic diagram of Structure of Embodiment 17 of the present invention Figure 18 Schematic diagram of Structure of Embodiment 18 of the present invention Figure 19 Schematic diagram of Structure of Embodiment 19 of the present invention Figure 20 Schematic diagram of Structure of Embodiment 20 of the present invention Figure 21 Schematic diagram of Structure of Embodiment 21 of the present invention Figure 22 Schematic diagram of Structure of Embodiment 22 of the present invention Figure 23 Schematic diagram of Structure of Embodiment 23 of the present invention Figure 24 Schematic diagram of Structure of Embodiment 24 of the present invention Detailed implementation manners

[0013] An anti-freezing indirect evaporative cooling air conditioning system for a data center, as Figure 1 shown, is composed of an evaporative refrigeration water supply device 1, a heat preservation space 4, and a water storage device 7. The heat preservation space 4 is composed of an upper heat preservation surface 5, a lower heat preservation surface 8, and a side heat preservation surface 6. The evaporative refrigeration water supply device 1 is placed on the upper heat preservation surface 5. A water storage device 7 is arranged in the heat preservation space 4. The evaporative refrigeration water supply device 1 is communicated with the water storage device 7 through a connecting pipe 2. The water storage device 7 is provided with a water outlet pipe 9. The cold water produced by the evaporative refrigeration water supply device 1 flows into the water storage device 7 through the connecting pipe 2. The water in the water storage device 7 is supplied to users through the water outlet pipe 9 and returns to the unit through the unit water inlet pipe 3. Most of the water pipelines and the water storage device 7 in this device are arranged in the heat preservation space 4, and there will be no problem of pipeline and equipment freezing during winter operation.

[0014] As Figure 2As shown in the figure, a water receiving tray 10 is provided at the bottom of the evaporative cooling water supply device 1. The heat preservation space 4 is composed of four walls of upper and lower heat preservation surfaces 5, 8 and side heat preservation surface 6. The evaporative cooling water supply device 1 is provided on the upper heat preservation surface 5 of the heat preservation space. The connecting pipe 2 provided on the bottom surface of the water receiving tray 10 is connected to the water storage device 7 located in the heat preservation space 4. The water storage device 7 is provided with a water outlet pipe 9. The unit water inlet pipe 3 located in the heat preservation space 4 is sequentially connected to the unit water inlet valve 11 and the pipeline to communicate with the unit spraying device. A drain pipe 47 is provided in the rear section of the unit water inlet valve 11, and the drain pipe 47 is communicated with the water storage device 7. A drain valve 12 can be added to the drain pipe 47. There is a water receiving tray 10 in the evaporative cooling water supply device 1. The water storage device 7 is a water tank. An inlet valve is provided on the unit water inlet pipe 3. A drain pipe and a drain valve 12 are connected after the unit water inlet valve 11. The cold water produced by the evaporative cooling water supply device 1 first falls into the unit water receiving tray 10, and the unit water receiving tray 10 flows into the water storage device 7 through the connecting pipe 2 of the evaporative cooling water supply device 1. The water in the water storage device 7 is supplied to users through the water outlet pipe 9, and the water of the users returns to the evaporative cooling water supply device 1 through the unit water inlet pipe 3. When the unit stops running, the unit water inlet valve 11 is closed, and the water in the unit water inlet pipe 3 flows into the water storage device 7 through the drain pipe and the drain valve 12.

[0015] As Figure 3 shown, a heating device 13 is provided in the heat preservation space 4. The heating device 13 is added in the heat preservation space 4. The heating device 13 can heat water or can be electric heating; when heating water, the hot water can be provided by an external heat source or can be provided by a water source heat pump; the main function of the heating device 13 is to ensure the temperature in the heat preservation space 4 so that pipelines, water storage devices 7, etc. in the heat preservation space 4 will not be frozen.

[0016] As Figure 4 shown, a water seal pipe 14 is provided on the connecting pipe 2 of the evaporative cooling water supply device 1. The water pipe can be an S-shaped bend or a P-shaped bend. The lower heat preservation surface 8 is a roof or a ground, and the upper heat preservation surface 5 is a unit foundation platform. The water seal pipe 14 is added to the unit water outlet pipe of the evaporative cooling device to prevent the cold air outside from entering the heat preservation space 4 through the unit water outlet pipe when the unit stops running. The upper heat preservation surface 5 of the heat preservation space 4 can be a unit foundation platform, and the lower heat preservation surface 8 of the heat preservation space 4 can be a roof / ground.

[0017] As Figure 5 shown, a surface cooler 15 is connected to the unit water inlet pipe 3, and the surface cooler 15 is installed on the air inlet of the evaporative cooling water supply device 1. The evaporative cooling device is an indirect evaporative chiller. The surface cooler 15 is connected in series on the unit water inlet pipe 3, and the surface cooler 15 is installed on the air inlet of the evaporative cooling device. In summer, it can cool the air entering the unit, making the produced water temperature lower, and can reduce the energy consumption of the system; in winter, it can heat the air inlet temperature of the unit to ensure that the unit will not be frozen and has the function of preventing freezing.

[0018] As shown Figure 6 in the figure, the surface cooler 15 connected to the water inlet pipe 3 of the unit is an anti-freezing surface cooler, and a surface cooler drain pipe 36 is provided on the anti-freezing surface cooler. The surface cooler 15 of the evaporation cooling device is an anti-freezing surface cooler, and a surface cooler drain pipe 36 and a surface cooler drain valve 12 are provided on the anti-freezing surface cooler. The surface cooler drain valve 12 adjusts the flow rate of the long-flow water of the surface cooler. When the unit stops running, the water in the surface cooler 15 can be discharged to the water receiving tray 10 through the surface cooler drain pipe 36, and the water in the water receiving tray 10 is discharged to the water storage device 7 through the unit outlet pipe, ensuring that there is no water in the water pipes and equipment outside the heat preservation space 4, and avoiding freezing.

[0019] As shown Figure 7 in the figure, the surface cooler 15 is an anti-freezing surface cooler, and uniformly distributed heat exchange pipelines are arranged in the anti-freezing surface cooler and inclined downward to the direction of the surface cooler drain pipe. The surface cooler 15 is an anti-freezing surface cooler, and the heat exchange pipelines of the surface cooler 15 slope towards the drain pipe direction. When the surface cooler 15 is not in use, the water in the surface cooler 15 can be discharged to the water receiving tray 10 through the surface cooler drain pipe 36 along the slope of the heat exchange pipes.

[0020] As shown Figure 8 in the figure, the surface cooler 15 is connected in parallel to the water inlet pipe 3 of the unit. The surface cooler 15 is divided into two parts, and the water inlet pipe 3 of the unit is respectively connected to the inlets of the two surface coolers. The surface cooler 15 of the evaporation cooling device is two in parallel, and the water inlet pipe 3 of the unit is respectively connected to the inlets of the two surface coolers 15, which can reduce the flow velocity in the pipes of the surface cooler 15, reduce the water resistance of the surface cooler 15, and reduce the power consumption of the water pump.

[0021] As shown Figure 9 in the figure, two air inlets are provided on the evaporation cooling water supply device 1, namely the first air inlet 16 and the second air inlet 17, and the surface cooler 15 is provided on the first air inlet 16 or the second air inlet 17. Two air inlets are provided on the evaporation cooling device, namely the first air inlet 16 and the second air inlet 17. A surface cooler is provided on the first air inlet 16 or the second air inlet 17. A wind valve or other opening and closing device is provided on the air inlet where the surface cooler is not provided. When the evaporation cooling device is only used as a cooling tower, the wind valve or opening and closing device on the air inlet is opened to reduce the energy consumption of the evaporation cooling device; when the evaporation cooling device is used as an indirect evaporative chiller, the opening and closing device on the air inlet is closed. The outdoor air enters the evaporation cooling device after being treated by the surface cooler 15. The first air inlet 16 and the second air inlet 17 can be arranged on one side, both sides or around the unit.

[0022] As shown Figure 10As shown in the figure, a bypass water pipe is provided on the unit water inlet pipe 3 located behind the incoming group water inlet valve 11 and in front of the water inlet pipe of the surface cooler 15. The bypass water pipe is connected to the spray device of the evaporation cooling water supply device 1 through the bypass water valve 18. A bypass water pipe is added in the heat preservation space 4 behind the unit water inlet valve 11 and before the water inlet of the surface cooler 15. The main function of the bypass water pipe is that the water entering the unit part can directly enter the unit spray through the bypass water pipe without passing through the surface cooler 15, which can reduce the water resistance of the unit and thus reduce the power consumption of the circulating water pump; in winter, in order to prevent the unit from freezing, it is necessary to increase the flow rate of the surface cooler 15. Therefore, it is necessary to adjust the bypass water pipe to increase the flow rate and velocity of the surface cooler 15 of the unit, improving the anti-freezing performance of the unit. The bypass water valve 18 is provided in the heat preservation and closed space, and the bypass water valve 18 mainly adjusts the bypass water flow rate.

[0023] As Figure 11 shown, the structure of the upper heat preservation surface of the heat preservation space is that a platform heat preservation layer 19 is provided under the unit foundation platform to prevent the cold outdoors from being transmitted into the heat preservation space through the platform. In addition, it can also prevent the phenomenon of condensation on the top of the heat preservation space. The platform support columns 22 provided in the heat preservation space support the unit foundation platform. Electric tracing devices 20 are provided on the unit water inlet pipe 3, the connecting pipe 2 and the bypass pipe of the evaporation cooling water supply device 1 before they pass through the heat preservation space to prevent the cold outdoors from being transmitted into the heat preservation space through the pipes and causing the water pipe to freeze. A floor drain 21 is provided at the low place of the heat preservation space floor. A water tank platform 23 is provided through the platform support columns 22. The water storage device 7 is installed on the water tank platform 23. A water tank top cover 24 is provided on the top of the water storage device 7. The sewage pipe provided at the bottom surface of the water storage device 7 is connected to the floor drain 21. A sewage valve 44 is provided on the sewage pipe. A bypass drain pipe is provided behind the bypass water valve 18. The bypass drain pipe is communicated with the water storage device 7. A bypass drain valve is provided on the bypass drain pipe. When the bypass water pipe is not applicable in winter, the water in the bypass pipe can be discharged through the bypass drain valve.

[0024] As Figure 12As shown in the figure, a water tank water treatment device 46 is provided on the water storage device 7. The water tank water treatment device 46 is connected to the water storage device 7 through a water pipe. An overflow pipe 45 is provided on the water storage device 7, and a floor drain 21 is connected to the outlet of the overflow pipe 45. Thermal insulation measures are added under the unit platform to prevent condensation at the bottom of the platform in winter and also reduce the heat dissipation of the platform in winter. Electric tracing measures are added when the unit inlet pipe 3, outlet pipe, and bypass pipe pass through the platform to prevent the water pipes from transferring cold energy when the unit stops operating, causing the water pipes connected to them to freeze. A floor drain 21 is added at the low point of the enclosed space, and the drainage of the enclosed space is discharged into the drainage system through the floor drain 21. The water storage device 7 can be arranged on the water storage device 7 platform built on the platform support column 22. A top cover of the water storage device 7 is added to the top of the water storage device 7 to prevent sundries from falling into the water storage device 7. A sewage discharge pipe is provided at the bottom of the water storage device 7, and a sewage discharge valve is provided on the sewage discharge pipe. The sewage discharge pipe leads to the floor drain 21, and the sewage in the water storage device 7 can be discharged regularly. An overflow pipe is provided in the water storage device 7. When the liquid level in the water storage device 7 exceeds the operating liquid level, the water in the water storage device 7 flows to the floor drain 21 through the overflow pipe. The water storage device 7 is provided with a water tank water treatment device 46, which can treat the water in the water tank.

[0025] The evaporation cooling water supply device 1 is an indirect evaporation chiller.

[0026] Such as Figure 13As shown in the figure, the lower heat-insulating surface is the roof, and below the roof floor is the air-conditioning floor. A primary water pump 27 is arranged in the heat exchange station or the heat-insulating space 4 below the air-conditioning floor. The inlet of the primary water pump 27 is connected to the outlet pipe 9 through a pipeline, and the outlet of the primary water pump 27 is connected to the inlet of the primary side of the plate heat exchanger 29 through the water treatment equipment 28. The outlet of the primary side of the plate heat exchanger 29 is connected to the inlet pipe 3 of the unit through a pipeline. A water storage tank 25 is arranged on the heat exchange station floor or outdoors. The water storage tank 25 is connected to the inlet of the primary water pump 27 through a make-up water pump 26 by a pipeline, and the make-up water pipe of the water storage tank 25 is connected to the make-up water system; the outlet pipe of the secondary side of the plate heat exchanger 29 is connected to the inlet of the air-conditioning terminal 32 through a secondary water pump 30 and a cold storage device 31, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 29. Water pumps, plate heat exchangers 29, cold storage devices, etc. are arranged in the heat exchange layer. The water in the water storage tank 25 is supplied to the primary side of the plate heat exchanger 29 through the outlet pipe of the water storage tank 25 and the primary side water supply pipe, taking away the heat of the secondary side of the system, and finally returning to the evaporation refrigeration unit through the primary side return pipe and the inlet pipe 3 of the unit. The heat in the water is discharged to the outdoors through the evaporation refrigeration unit; the secondary side of the plate heat exchanger 29 is connected to the air-conditioning terminal 32 through the secondary side water supply pipe and the secondary side return pipe, and the heat in the room is taken away through the air-conditioning terminal 32. A cold storage device is arranged on the secondary side water supply pipe to ensure continuous cooling after the system power failure. A make-up water system is arranged at the inlet of the primary side water pump. A large water tank is arranged in the make-up water system. The large water tank has a water storage function. When the water supply system stops supplying water, the large water tank can ensure make-up water for the air-conditioning system for a certain period of time; a float valve is arranged in the large water tank, and the large water tank is replenished with water through the system water supply.

[0027] As Figure 14 shown in the figure, the outlet pipe 9 is connected to the inlet of the primary side of the plate heat exchanger 29 through the primary water pump 27 and the water treatment equipment 28, and its outlet pipe is connected to the inlet pipe 3 of the unit. The outlet pipe of the secondary side of the plate heat exchanger 29 is connected to the inlet of the air-conditioning terminal 32 through the secondary water pump 30 and the cold storage device 31. The outlet of the air-conditioning terminal 32 is connected to the inlet of the secondary side of the plate heat exchanger 29. A float valve is arranged in the water storage device 7, and the system make-up water is connected to the float valve of the water tank. The large water tank is cancelled, and the large water tank and the water storage device 7 in the heat-insulating space 4 are combined, and the make-up water of the air-conditioning system is directly replenished into the water storage device 7, and the volume of the water storage device 7 is increased to ensure that after the water supply system stops supplying water, the water in the water storage device 7 can ensure the operation of the air-conditioning system for a certain period of time. The primary circulation water pump can also be arranged on the roof and can also be dispersed. One water pump is correspondingly arranged for each water storage device 7.

[0028] As Figure 15As shown, the water outlet pipe 9 is connected to the inlet of the primary side of the plate heat exchanger 29 through the primary water pump 27 and the water treatment equipment 28, and its outlet pipe is connected to the inlet of the condenser of the mechanical refrigeration unit 33. The outlet pipe of its condenser is connected to the water inlet pipe 3 of the unit. The outlet pipe of the secondary side of the plate heat exchanger 29 is connected to the inlet of the evaporator of the mechanical refrigeration unit 33. Its chilled water outlet pipe is connected to the inlet of the air-conditioning terminal 32 through the secondary water pump 30 and the cold storage device 31, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 29 through the first switching valve 34 and to the inlet of the evaporator of the mechanical refrigeration unit 33 through the second switching valve 35. The mechanical refrigeration unit 33 is added to the system. On the primary side of the system, the water outlet of the plate heat exchanger 29 serves as the cooling water of the mechanical refrigeration unit 33 and then returns to the unit through the primary side return water pipe of the system. On the secondary side of the system, the water outlet of the plate heat exchanger 29 is connected to the evaporator of the mechanical refrigeration unit 33, and the first switching valve 34 and the second switching valve 35 for system switching are added to the secondary side system. When the water outlet temperature of the evaporation refrigeration unit is higher than the system return water temperature, the first switching valve 34 of the system switching is closed and the second switching valve 35 is opened. When the water outlet temperature of the evaporation refrigeration unit is lower than the system return water temperature, the first switching valve 34 is opened and the second switching valve 35 is closed.

[0029] As Figure 16 shown, the water storage device 7 located in the heat preservation space, its water outlet pipe 9 is successively connected to the primary water pump 27, the water treatment equipment 28 and the inlet of the primary side of the plate heat exchanger 29, its outlet pipe is connected to the water inlet pipe 3 of the unit, the inlet pipe of the secondary side of the plate heat exchanger 29 is connected to the cold storage device 31, and the outlet pipe of the cold storage device 31 is connected to the inlet of the air-conditioning terminal 32 located on the air-conditioning floor through the secondary water pump 30, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 29. The equipment such as the plate heat exchanger 29, the water pump and the cold storage device 31 of the system are placed in the roof heat preservation space 4.

[0030] As Figure 17 shown, the cold storage device 31 is arranged in the heat exchange room. The outlet pipe of the secondary side of the plate heat exchanger 29 is connected to the water inlet of the air-conditioning terminal 32 through the secondary water pump 30 and the cold storage device 31, and its outlet is connected to the secondary side inlet of the plate heat exchanger 29. The cold storage device 31 is placed in the heat exchange room.

[0031] As Figure 18As shown in the figure, the water storage device 7 located in the heat-insulated space has its water outlet pipe 9 of the water storage device connected to the primary side inlet of the plate heat exchanger 29 through the primary water pump 27 and the water treatment equipment 28. Its primary side outlet pipe is connected to the condenser inlet of the mechanical refrigeration unit 33. Its outlet pipe is connected to the water inlet pipe 3 of the unit. The secondary side outlet pipe of the plate heat exchanger 29 is connected to the evaporator inlet of the mechanical refrigeration unit 33. The evaporator outlet pipe is connected to the chilled water storage device 31. Its outlet pipe is connected to the inlet of the air-conditioning terminal 32 through the secondary water pump 30. Its outlet pipe is connected to the secondary side inlet of the plate heat exchanger 29 through the first switching valve 34 and to the evaporator inlet of the mechanical refrigeration unit 33 through the second switching valve 35. Equipment such as the system plate heat exchanger 29, water pumps, chilled water storage device 31, and mechanical refrigeration unit 33 are placed in the roof heat-insulated space 4.

[0032] As Figure 19 shown, the primary side return water pipe of the plate heat exchanger 29 is connected to the water inlet pipe 3 of the unit. The water inlet pipe 3 of the unit is connected to the inlet of the condenser of the mechanical refrigeration unit 33 through the surface cooler 15. Drain pipes communicating with the water storage device 7 are provided on both the condenser outlet pipe of the mechanical refrigeration unit 33 and the outlet pipe of the surface cooler 15. Drain valves 12 are provided on the drain pipes. The condenser outlet pipe of the mechanical refrigeration unit 33 is connected to the spray device of the evaporation refrigeration water supply device 1. The water in the water storage device 7 is supplied to the primary side of the plate heat exchanger 29 through the water outlet pipe of the water storage device 7 and the primary side system water supply pipe, taking away the system heat. The water passing through the primary side of the plate heat exchanger 29 enters the unit surface cooler 15 through the primary side system return water pipe and the water inlet pipe 3 of the unit. The water after passing through the unit surface cooler 15 enters the condenser of the mechanical refrigeration unit 33 through the outlet pipe of the surface cooler 15, taking away the heat of the mechanical refrigeration unit 33, and finally returns to the unit spray through the mechanical refrigeration cooling water outlet pipe to form a cycle. This system Figure 15 , compared with

[0033] As Figure 20As shown in the figure, the mechanical refrigeration unit 33 is arranged outside the heat preservation space. A connecting pipe is provided between the water storage device 7 and the cold storage device 31, and a connecting valve is arranged on the connecting pipe. A drain pipe is arranged on the evaporator inlet pipe of the mechanical refrigeration unit 33, and the drain pipe is communicated with the cold storage device 31, and a valve is arranged on the drain pipe. Electric auxiliary heating is arranged on the evaporator inlet and outlet pipes of the mechanical refrigeration unit 33 before passing through the equipment platform. The mechanical refrigeration unit 33 is placed outside the heat preservation space 4 and combined with the evaporation refrigeration device; the evaporation refrigeration device makes cold water fall into the water receiving tray 10, and the water in the water receiving tray 10 flows into the water storage device 7 through the unit outlet pipe. The water in the water storage device 7 is supplied to the plate heat exchanger 29 through the water outlet pipe 9 of the water storage device 7 and the primary side water supply pipe of the system. After taking away the heat of the system, the primary side outlet water of the plate heat exchanger 29 passes through the primary side return pipe and the unit inlet pipe 3, first passes through the surface cooler 15, and then passes through the condenser of the mechanical refrigeration unit 33 to take away the heat of the mechanical refrigeration unit 33, and finally returns to the evaporation refrigeration unit to form a cycle. The return water of the air-conditioning terminal 32 is communicated with the secondary side inlet of the plate heat exchanger 29 and the evaporator of the mechanical refrigeration unit 33 through pipelines. The outlet of the secondary side of the plate heat exchanger 29 is communicated with the evaporator of the mechanical refrigeration unit 33. A cold storage device is arranged at the outlet of the water outlet pipe of the mechanical refrigeration evaporator. The water in the cold storage device is supplied to the air-conditioning terminal 32 through the secondary water pump 30 and the secondary side water supply pipe. When the cold water made by the evaporation refrigeration device has a temperature lower than the temperature of the secondary side system return water, the system switching first switching valve 34 is opened, and the system second switching valve 35 is closed. The water supply on the primary side first exchanges heat with the return water on the secondary side of the plate heat exchanger 29, and the secondary side cold water after heat exchange then enters the evaporator of the mechanical refrigeration unit 33. If the temperature of the secondary side water after heat exchange meets the system requirements, the mechanical refrigeration unit 33 does not need to be started. If the temperature of the secondary side cold water after heat exchange is higher than the system water supply requirements, the mechanical refrigeration unit 33 is started for supplementary refrigeration and finally supplied to the air-conditioning terminal 32. When the cold water made by the evaporation refrigeration device has a temperature higher than the system return water temperature, the system switching first switching valve 34 is closed, and the system second switching valve 35 is opened. The secondary side system return water directly returns to the evaporator of the mechanical refrigeration unit 33, and after mechanical refrigeration, it is supplied to the air-conditioning terminal 32. A long flowing water pipe and a water valve on the freezing side are added to the mechanical refrigeration inlet pipe in this system. When the unit stops running, the system switching first switching valve 34 and the second switching valve 35 are closed at the same time, and the water in the mechanical refrigeration unit 33 and the water pipes outside the heat preservation space will be discharged into the cold storage device. And electric auxiliary heating is arranged on the mechanical refrigeration inlet and outlet pipes of the traditional heat preservation space 4. A connecting water pipe is added between the cold storage device 31 and the water storage device 7, and a connecting valve is added to the connecting water pipe; when the system stops supplying water and the water in the water storage device 7 is used up, the connecting water valve can be opened to supply the water in the cold storage device 31 to the water storage device 7 to supplement water to the primary side system, and the water in the water storage tank 25 will not flow into the cold storage device 31.

[0034] As Figure 21As shown in the figure, the mechanical refrigeration unit is the water source heat pump 37. The water outlet of the air-conditioning terminal 32 is connected to the secondary side water inlet of the plate heat exchanger 29 through the secondary water pump 30 and the first switching valve 34. At the same time, the water outlet of the air-conditioning terminal 32 is connected to the evaporator inlet of the water source heat pump 37 through the secondary water pump 30, the second switching valve 35, and the third switching valve 38. The secondary side water outlet of the plate heat exchanger 29 is connected to the inlet of the cold storage device 31 through the fourth switching valve 39. At the same time, the secondary side water outlet of the plate heat exchanger 29 is connected to the evaporator inlet of the water source heat pump 37 through the third switching valve 38. The evaporator outlet is connected to the inlet of the cold storage device 31 through the seventh switching valve 42. The hot water return pipe is connected to the evaporator inlet of the water source heat pump 37 through the fifth switching valve 40, and the hot water supply pipe is connected to the evaporator outlet of the water source heat pump 37 through the sixth switching valve 41. The mechanical refrigeration unit 33 is a heat pump unit, which can refrigerate in summer and heat in winter. The third switching valve 38, the fourth switching valve 39, the fifth switching valve 40, the sixth switching valve 41, and the seventh switching valve 42 are added to the system. When the water source heat pump refrigerates, the fourth switching valve 39, the fifth switching valve 40, and the sixth switching valve 41 are closed. The return water on the secondary side is first precooled by the plate heat exchanger 29, then enters the water source heat pump 37, and then enters the cold storage device 31 after being cooled further, and is supplied to the air-conditioning terminal 32. Or the return water of the secondary side system directly enters the water source heat pump 37 for refrigeration, and the cooled cold water enters the cold storage device 31 and is supplied to the air-conditioning terminal 32. When the water source heat pump heats, the third switching valve 38 and the seventh switching valve 42 are closed, and the rest of the valves need to be opened. The evaporative cooling device produces cold water and exchanges heat with the return water of the secondary side system through the plate heat exchanger 29. After the heat exchange, the temperature rises, and it is supplied to the heat pump to take away the cold of the heat pump and return to the evaporative cooling device. The evaporative cooling device adjusts the exhaust air volume according to the return water temperature to ensure that the supply water temperature will not be too low. The hot water produced by the heat pump can be used for heating the insulation space 4 or providing heating for other areas.

[0035] As Figure 22 shown, a water source heat pump 37 is added in the insulation space. The heat pump water inlet and outlet pipes of the water source heat pump 37 are respectively connected to the outlet of the first side of the plate heat exchanger 29 and the unit inlet pipe 3. A water source heat pump 37 is added in the insulation space 4. The water source of the water source heat pump 37 is provided by the evaporative cooling device. The water source heat pump 37 unit can refrigerate in summer, and the produced cold water can be provided to the air-conditioning terminal 32 in the computer room or the office area for maintenance personnel for refrigeration. The water source heat pump can heat in winter, and the produced hot water can be provided for heating the insulation space 4 or providing heating for other areas. The heat pump water inlet pipe is connected to the outlet pipe of the first side of the plate heat exchanger 29, and the heat pump water outlet pipe is connected to the evaporative cooling unit inlet pipe 3. A part of the cold water on the first side of the plate heat exchanger 29 is used as the water source of the water source heat pump.

[0036] As Figure 23As shown, the evenly distributed anti-freeze air-conditioning devices form a unit group, and the water storage devices 7 are connected through the balance pipe 43. The water storage devices 7 are connected through the balance pipe 43 to ensure the balance of the water system.

[0037] As Figure 24 shown, the evenly distributed anti-cooling air-conditioning devices form a unit group. Some of the water pipelines of the unit group are not in the thermal insulation space, and an electric tracing heating device 20 is provided on the water pipeline located outside the thermal insulation space. Some of the water pipelines are not in the thermal insulation space 4, and electric tracing heating 20 needs to be considered to assist on the pipelines outside the thermal insulation space to prevent the pipelines from being frozen.

[0038] The pipeline in the evaporation cooling water supply device 1 cannot be arranged in the thermal insulation space 4 and an electric tracing heating device needs to be provided.

[0039] The cold storage device 31 placed in the thermal insulation space 4 can be an open-type cold storage water tank.

Claims

1. An anti-freezing indirect evaporative cooling air conditioning system for a data center, characterized in that: It consists of an evaporation cooling water supply device (1), a heat preservation space (4), and a water storage device (7). The heat preservation space (4) is composed of an upper heat preservation surface (5), a lower heat preservation surface (8), and a side heat preservation surface (6). The evaporation cooling water supply device (1) is placed on the upper heat preservation surface (5). A water storage device (7) is arranged inside the heat preservation space (4). The evaporation cooling water supply device (1) is communicated with the water storage device (7) through a connecting pipe (2). The water storage device (7) is provided with a water outlet pipe (9). The cold water produced by the evaporation cooling water supply device (1) flows into the water storage device (7) through the connecting pipe (2). The water in the water storage device (7) is supplied to users through the water outlet pipe (9) and returns to the unit through the unit water inlet pipe (3). A water receiving tray (10) is arranged at the bottom of the evaporation cooling water supply device (1). The heat preservation space (4) is composed of the four walls of the upper and lower heat preservation surfaces (5, 8) and the side heat preservation surface (6). The evaporation cooling water supply device (1) is arranged on the upper heat preservation surface (5) of the heat preservation space. The connecting pipe (2) arranged on the bottom surface of the water receiving tray (10) is connected to the water storage device (7) located inside the heat preservation space (4). The water storage device (7) is provided with a water outlet pipe (9). The unit water inlet pipe (3) located inside the heat preservation space (4) is sequentially communicated with the unit water spray device through the arranged unit water inlet valve (11) and pipeline. A drain pipe (47) is arranged at the rear section of the unit water inlet valve (11). The drain pipe (47) is communicated with the water storage device (7). A heating device (13) is arranged inside the heat preservation space (4). A surface cooler (15) is connected to the unit water inlet pipe (3). The surface cooler (15) is installed at the air inlet of the evaporation cooling water supply device (1). The surface cooler (15) is connected in parallel to the unit water inlet pipe (3). The surface cooler (15) is divided into two parts. The unit water inlet pipe (3) is respectively connected to the inlets of the two surface coolers. A bypass water pipe is arranged on the unit water inlet pipe (3) behind the unit water inlet valve (11) and in front of the inlet pipe of the surface cooler (15). The bypass water pipe is connected to the spray device of the evaporation cooling water supply device (1) through a bypass water valve (18). The water outlet pipe (9) is connected to the primary side inlet of a plate heat exchanger (29) through a primary water pump (27) and a water treatment device (28). The primary side outlet pipe of the plate heat exchanger (29) is connected to the inlet of the condenser of a mechanical refrigeration unit (33). The condenser outlet pipe of the mechanical refrigeration unit (33) is connected to the unit water inlet pipe (3). The secondary side outlet pipe of the plate heat exchanger (29) is connected to the inlet of the evaporator of the mechanical refrigeration unit (33). The chilled water outlet pipe of the evaporator of the mechanical refrigeration unit (33) is connected to the inlet of an air-conditioning terminal (32) through a secondary water pump (30) and a chilled water storage device (31). The outlet pipe of the air-conditioning terminal (32) is connected to the primary side inlet of the plate heat exchanger (29) through a first switching valve (34) and to the inlet of the evaporator of the mechanical refrigeration unit (33) through a second switching valve (35).The mechanical refrigeration unit is a water source heat pump (37). The water outlet of the air-conditioning terminal (32) is connected to the secondary water inlet of the plate heat exchanger (29) through the secondary water pump (30) and the first switching valve (34). At the same time, the water outlet of the air-conditioning terminal (32) is connected to the inlet of the evaporator of the water source heat pump (37) through the secondary water pump (30), the second switching valve (35), and the third switching valve (38). The secondary water outlet of the plate heat exchanger (29) is connected to the inlet of the cold storage device (31) through the fourth switching valve (39). At the same time, the secondary water outlet of the plate heat exchanger (29) is connected to the inlet of the evaporator of the water source heat pump (37) through the third switching valve (38). The outlet of the evaporator is connected to the inlet of the cold storage device (31) through the seventh switching valve (42). The hot water return pipe is connected to the inlet of the evaporator of the water source heat pump (37) through the fifth switching valve (40), and the hot water supply pipe is connected to the outlet of the evaporator of the water source heat pump (37) through the sixth switching valve (41).;

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