CN111295085A - Evaporative cooling air-conditioning system for data center based on air cooling and water cooling combined unit - Google Patents

Abstract

The invention discloses an evaporative cooling air-conditioning system for a data center based on an air-cooling and water-cooling combined unit, which comprises a water side evaporative cooling unit, a wind side evaporative cooling unit and a data center machine room unit communicated with the wind side evaporative cooling unit, wherein the data center machine room unit is connected with the water side evaporative cooling unit through a secondary side liquid supply pipe and a secondary side liquid return pipe, and a secondary side circulating water pump is arranged on the secondary side liquid supply pipe. According to the air conditioning system, the air side evaporative cooling technology and the water side evaporative cooling technology are effectively combined together, the data center is cooled in a room level in an air cooling mode, and chips of the server are cooled in a water cooling mode, so that the energy consumption of the data center is reduced.

Description

Evaporative cooling air conditioning system for data centers based on air-cooled and water-cooled composite units

technical field

The invention belongs to the technical field of air-conditioning systems, and in particular relates to an evaporative cooling air-conditioning system for data centers based on air-cooled and water-cooled composite units.

Background technique

With the rapid development of new technologies such as artificial intelligence, cloud computing, big data, and 5G, data centers serve as service platforms for centralized processing, transmission, storage, and exchange of data and information. The number of data centers under construction has exploded exponentially. At the same time, based on the surge in market demand, IT computing power continues to evolve, CPU and server power continues to increase, and data centers are bound to develop toward high density. Currently, the average power of a single data center cabinet is 6 ～8KW, it is expected that 15-20KW/cabinet will become the mainstream in the future, so the power consumption of the data center is huge, among which the energy consumption of the air conditioning system accounts for about 40% of the total energy consumption.

Faced with the high energy consumption of the data center air conditioning system, the existing cooling methods include air cooling and water cooling. The traditional air cooling method has the disadvantages of small specific heat capacity and low thermal conductivity, resulting in high transportation energy consumption and large heat transfer temperature difference. It is not conducive to the heat being taken away in time, and it has gradually been unable to meet the cooling and cooling needs of computer equipment, and the equipment of the air conditioning system occupies a large amount of space in the data center where "land is expensive". The pipeline is huge and complex, which is not conducive to the utilization of natural cold sources, and the later operation and maintenance are also difficult, and they all need to consume a lot of electricity. Therefore, it is necessary to optimize and improve the data center air conditioning system.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an evaporative cooling air conditioning system for a data center based on an air-cooled and water-cooled composite unit, which effectively combines the air-side evaporative cooling technology and the water-side evaporative cooling technology, and provides an air-cooled form to the data center. Perform room-level cooling and cooling, and perform chip-level cooling on the chips of the server in the form of water cooling, thereby reducing the energy consumption of the data center.

The technical solution adopted in the present invention is that an evaporative cooling air-conditioning system for data centers based on air-cooled and water-cooled composite units includes a water-side evaporative cooling unit, an air-side evaporative cooling unit, and a data center computer room connected with the air-side evaporative cooling unit The unit, the data center computer room unit is connected to the water-side evaporative cooling unit through the secondary-side liquid supply pipe and the secondary-side liquid return pipe, and the secondary-side liquid supply pipe is provided with a secondary-side circulating water pump.

The present invention is also characterized in that,

The air-side evaporative cooling unit includes an air-conditioning unit combined with indirect evaporative cooling and mechanical refrigeration, an air supply pipe and a return air pipe; the air-conditioning unit combined with indirect evaporative cooling and mechanical refrigeration is connected to the data center room unit through the air supply pipe and the return air pipe. .

The air-conditioning unit combining indirect evaporative cooling and mechanical refrigeration includes a unit casing a. The two opposite side walls of the unit casing a are respectively provided with a primary air inlet and a primary air supply outlet. The air filter a, the indirect evaporative cooling section, the humidification section, the evaporator and the primary air blower are arranged in sequence in the flow direction; a condenser is arranged above the indirect evaporative cooling section, and the top wall of the unit shell a corresponding to the condenser is arranged on the top wall. The secondary air outlet is provided with a secondary air exhaust fan, and the side walls of the unit shell a corresponding to the opposite sides of the indirect evaporative cooling section are provided with secondary air inlets. An air filter b is arranged at the air inlet; an expansion valve and a compressor are also arranged below the evaporator, and the condenser, the expansion valve, the compressor and the evaporator are connected by pipes to form a closed loop.

The indirect evaporative cooling section includes an indirect evaporative cooler a, a high-pressure spray water distributor and a water collecting tank a, which are arranged in sequence from top to bottom. The nozzles on the high-pressure spray water distributor face the indirect evaporative cooler a. The water supply pipe a is connected with the water collecting tank a; the water supply pipe a is also provided with a circulating water pump a, and the two opposite side walls of the unit housing a corresponding to the high-pressure spray water distributor and the water collecting tank a are provided with secondary air Inlet.

The humidification section includes a water distributor a, a filler a and a water collecting tank c arranged in sequence from top to bottom. The water distributor a is connected to the water collecting tank c through a first water pipe; the first water pipe is also provided with a circulating water pump c.

The data center computer room unit includes a return air duct set at the top of the data computer room, and a floor air supply duct set below the floor of the data computer room; the return air duct is connected to the primary air outlet through a return air duct, and the floor air duct passes through a supply air duct It is connected with the primary air inlet; it also includes several groups of server unit modules arranged in the data center room between the return air duct and the floor air supply duct, each group of server unit modules is composed of two server cabinets, and two The air outlet sides of adjacent server unit modules are arranged opposite to each other, and a hot channel is formed between the air outlet sides of the two adjacent server unit modules, and a cold channel is formed between two sets of server cabinets in each group of server unit modules; There are several return air vents on the return air duct, and the hot aisle communicates with the return air duct through the return air vents; there are several air supply vents on the floor air supply duct, and the cold aisle communicates with the floor air supply duct through the air supply vents; There is a liquid cooling module for cooling the heating chip of the server. The liquid cooling module corresponds to the server cabinet one by one. Each liquid cooling module is connected to the water side evaporative cooling unit through the secondary liquid supply pipe and the secondary liquid return pipe. connect.

The liquid cooling module includes a collector, a flow divider and several liquid cooling plates. Each liquid cooling plate is connected to the flow divider through a liquid inlet pipe, and each liquid cooling plate is connected to the current collector through a liquid outlet pipe. The flow device is also connected with the secondary side liquid return pipe, the flow divider is also connected with the secondary side liquid supply pipe, and the liquid cooling plate is in one-to-one correspondence with the server.

The water-side evaporative cooling unit includes a plate heat exchanger and an indirect-direct evaporative cooling chiller; the plate heat exchanger is connected to the indirect-direct evaporative cooling chiller through the primary-side return pipe and the primary-side water supply pipe, and the primary-side return pipe is provided with There is a primary side circulating water pump.

The indirect-direct evaporative cooling chiller includes an organic unit casing b. Air inlets are symmetrically arranged on the two opposite side walls of the unit casing b. A direct evaporative cooling unit is arranged in the middle of the unit casing b. The indirect evaporative cooling unit is symmetrically arranged;

The direct evaporative cooling unit includes a direct section exhaust fan, a water baffle, a water distributor b, a filler b and a water collecting tank c, which are arranged in sequence from top to bottom; the water distributor b is connected to the water collecting tank c through a second water pipe; the direct section A direct section air outlet is provided on the top wall of the unit casing b corresponding to the upper part of the exhaust fan;

The indirect evaporative cooling unit includes an indirect section exhaust fan, a water distributor c, an indirect evaporative cooler b and a water collecting tank b, which are arranged in sequence from top to bottom. The water distributor c is connected to the water collecting tank b through the water supply pipe b, and the water supply pipe b A circulating water pump b is also arranged on the upper part, and an indirect section air outlet is arranged on the top wall of the unit casing b corresponding to the upper part of the indirect section exhaust fan;

One end of the primary side water supply pipe is connected to the plate heat exchanger, and the other end of the primary side water supply pipe is connected to the water collecting tank c; one end of the primary side water return pipe is connected to the plate heat exchanger, and the other end of the primary side water return pipe is connected to the water distributor bConnect.

An air filter c is provided at the air inlet.

The beneficial effects of the present invention are:

(1) The present invention effectively combines the air-side evaporative cooling technology and the water-side evaporative cooling technology based on the evaporative cooling air-conditioning system for the data center based on the air-cooled and water-cooled composite units, and performs room-level air-cooling on the data center in the form of air cooling. Cooling and cooling, the chip-level cooling of the server chips in the form of water cooling, the two cooling methods cooperate with each other to achieve efficient cooling of the data center.

(2) The present invention is based on an evaporative cooling air-conditioning system for a data center based on an air-cooled and water-cooled composite unit, uses the wind-side indirect evaporative cooling technology to cool the data room, utilizes the natural cold source to the greatest extent, and reduces the operating time of the mechanical refrigeration. Effectively reduce the energy consumption of the data center.

(3) The present invention is based on an evaporative cooling air-conditioning system for a data center based on an air-cooled and water-cooled composite unit, and uses the water-side evaporative cooling technology to cool the liquid-cooled module of the server, thereby accurately and quickly cooling the server chip, which greatly improves the performance. The cooling efficiency of the server.

(4) The present invention is based on the evaporative cooling air-conditioning system for data centers based on air-cooled and water-cooled composite units, taking into account the respective advantages of air-cooling and water-cooling, and solving the problems of low efficiency of traditional air-cooling and large equipment footprint. Compared with The traditional air-conditioning water system has a simple system form and is easy to maintain and operate.

(5) The present invention is based on an evaporative cooling air-conditioning system for a data center based on an air-cooled and water-cooled composite unit, and skillfully combines the evaporative cooling technology with the liquid cooling technology to improve the energy efficiency of the air-conditioning system of the data center as a whole, which is in line with the requirements of a green data center. development requirements.

Description of drawings

1 is a schematic structural diagram of an evaporative cooling air-conditioning system for a data center based on an air-cooled and water-cooled composite unit of the present invention;

2 is a schematic structural diagram of a server cabinet liquid cooling module in the air conditioning system of the present invention;

3 is a schematic structural diagram of an air-conditioning unit combining indirect evaporative cooling and mechanical refrigeration in the wind-side evaporative cooling unit in the air-conditioning system of the present invention;

4 is a schematic structural diagram of the indirect-direct evaporative cooling chiller in the water-side evaporative cooling unit in the air conditioning system of the present invention.

In the figure, 1. Data center room unit, 2. Server cabinet, 3. Server, 4. Liquid cooling module, 5. Floor air duct, 6. Air supply duct, 7. Air side evaporative cooling unit, 8. Return air Pipe, 9. Return air duct, 10. Air return port, 11. Hot aisle, 12. Cold aisle, 13. Air supply port, 14. Secondary liquid supply pipe, 15. Secondary liquid return pipe, 16. Secondary Side circulating water pump, 17. Plate heat exchanger, 18. Primary side return pipe, 19. Primary side water supply pipe, 20. Primary side circulating water pump, 21. Water side evaporative cooling unit, 22. Liquid cooling plate, 23. Liquid inlet Pipe, 24. Liquid outlet pipe, 25. Collector, 26. Diverter, 27. Air conditioning unit combined with indirect evaporative cooling and mechanical refrigeration, 28. Primary air inlet, 29. Indirect evaporative cooler a, 30. Two Secondary air exhaust port, 31. Secondary air exhaust fan, 32. Condenser, 33. Water distributor a, 34. Packing a, 35. Evaporator, 36. Primary air supply fan, 37. Primary air supply port, 38 .Expansion valve, 39. Compressor, 40. Water collecting tank c, 41. Circulating water pump c, 42. Circulating water pump a, 43. Water supply pipe a, 44. Water collecting tank a, 45. Air filter b, 46. Secondary Air inlet, 47. High pressure spray water distributor, 48. Air filter a, 49. Indirect-direct evaporative cooling chiller, 50. Water baffle, 51. Direct section exhaust fan, 52. Direct section exhaust port, 53. Water distributor b, 54. Packing b, 55. Indirect section air outlet, 56. Indirect section exhaust fan, 57. Water distributor c, 58. Water supply pipe b, 59. Air inlet, 60. Air filter Device c, 61. Circulating water pump b, 62. Collecting tank b, 63. Indirect evaporative cooler b, 64. Collecting tank c.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The present invention is based on an evaporative cooling air-conditioning system for a data center based on an air-cooled and water-cooled composite unit, as shown in Figs. The data center room unit 1 is connected to the water side evaporative cooling unit 21 through the secondary side liquid supply pipe 14 and the secondary side liquid return pipe 15, and the secondary side liquid supply pipe 14 is provided with a secondary side Circulating water pump 16.

As shown in Figure 3, the air-side evaporative cooling unit 7 includes an air-conditioning unit 27 combined with indirect evaporative cooling and mechanical refrigeration, an air supply pipe 6 and a return air pipe 8; the air-conditioning unit 27 combined with indirect evaporative cooling and mechanical refrigeration The pipe 6 and the return air pipe 8 are communicated with the data center equipment room unit 1 .

The air-conditioning unit 27 combined with indirect evaporative cooling and mechanical refrigeration includes a unit casing a. The two opposite side walls of the unit casing a are respectively provided with a primary air inlet 28 and a primary air supply outlet 37. The flow direction after entering is provided with an air filter a48, an indirect evaporative cooling section, a humidification section, an evaporator 35 and a primary air blower 36; a condenser 32 is arranged above the indirect evaporative cooling section, and the corresponding unit shell above the condenser 32 A secondary air exhaust port 30 is provided on the top wall of a, a secondary air exhaust fan 31 is provided at the secondary air exhaust port 30, and the side walls of the unit housing a corresponding to the opposite sides of the indirect evaporative cooling section are A secondary air inlet 46 is provided, and an air filter b45 is provided at the secondary air inlet 46; an expansion valve 38 and a compressor 39 are also provided below the evaporator 35, a condenser 32, an expansion valve 38, and a compressor 39 and The evaporator 35 is connected by pipes and forms a closed circuit, and the mechanical refrigeration section is direct expansion compression refrigeration. The indirect evaporative cooling section includes an indirect evaporative cooler a29, a high-pressure spray water distributor 47 and a water collecting tank a44, which are arranged in sequence from top to bottom. The nozzles on the high-pressure spray water distributor 47 face the indirect evaporative cooler a29. The device 47 is connected with the water collecting tank a44 through the water supply pipe a43; the water supply pipe a43 is also provided with a circulating water pump a42, and the two opposite side walls of the unit housing a corresponding to the high pressure spray water distributor 47 and the water collecting tank a44 are provided on both sides. There are secondary air inlets 46 . The indirect evaporative cooler a29 is the main core component and has a flow channel communicating with the outdoor secondary air. The outdoor secondary air and the indoor primary air conduct heat exchange in the indirect evaporative cooler a29. The form of the indirect evaporative cooler a29 can be either plate-fin type or tube type; the indoor primary air supply fan 36 is a centrifugal fan, and the outdoor secondary air exhaust fan 31 is an axial flow fan.

The air-conditioning unit combined with indirect evaporative cooling and mechanical refrigeration operates throughout the year 27. It is mainly based on indirect evaporative cooling and supplemented by mechanical refrigeration. It takes advantage of indirect evaporative cooling on the wind side and makes full use of natural cold sources, thereby reducing the energy consumption of mechanical refrigeration. .

The humidification section includes a water distributor a33, a filler a34 and a water collecting tank c40 arranged in sequence from top to bottom. The water distributor a33 is connected to the water collecting tank c40 through a first water pipe; the first water pipe is also provided with a circulating water pump c41.

The data center equipment room unit 1 includes a return air duct 9 arranged on the top of the data equipment room, and a floor air supply duct 5 arranged under the floor of the data equipment room; The air duct 5 is connected with the primary air inlet 28 through the air supply duct 6; it also includes several groups of server unit modules located between the return air duct 9 and the floor air supply duct 5 in the data center room, and each group of server unit modules. Both are composed of two server cabinets 2, and the air outlet sides of the two adjacent server unit modules are arranged opposite to each other, and a hot channel 11 is formed between the air outlet sides of the two adjacent server unit modules. A cold aisle 12 is formed between the two groups of server cabinets 2 in the module; a number of return air ports 10 are arranged on the return air duct 9, and the hot aisle 11 communicates with the return air duct 9 through the return air opening 10; the floor air supply duct 5 is provided with Several air supply ports 13, the cold aisle 12 is communicated with the floor air supply duct 5 through the air supply ports 13; each server cabinet 2 is also provided with a liquid cooling module 4 for cooling the heating chip of the server 3, and the liquid cooling module 4 is connected to the server. The cabinets 2 are in one-to-one correspondence, and each liquid cooling module 4 is connected to the water-side evaporative cooling unit 21 through the secondary-side liquid supply pipe 14 and the secondary-side liquid return pipe 15 . The air-conditioning unit 27 combined with indirect evaporative cooling and mechanical refrigeration forms a closed loop with the cold aisle 12 and the hot aisle 11 of the data center computer room unit 1 through the air supply pipe 6 and the return air pipe 8; The upper back, the cold aisle 12 and the hot aisle 11 are separated.

As shown in FIG. 2 , the liquid cooling module 4 includes a collector 25 , a flow divider 26 and several liquid cooling plates 22 . Each liquid cooling plate 22 is connected to the flow divider 26 through a liquid inlet pipe 23 . The plates 22 are all connected to the collector 25 through the liquid outlet pipe 24, the collector 25 is also connected to the secondary side liquid return pipe 15, the flow divider 26 is also connected to the secondary side liquid supply pipe 14, and the liquid cooling plate 22 is connected to the server. 3 one-to-one correspondence. The liquid cooling plate 22 is used to exchange heat with the heating chip of the server 3, and a material with high thermal conductivity should be used. The liquid cooling module 4 , the plate heat exchanger 17 and the secondary side circulating water pump 16 are connected by the secondary liquid supply pipe 14 and the liquid return pipe 15 to form a circulation loop.

As shown in FIG. 4 , the water-side evaporative cooling unit 21 includes a plate heat exchanger 17 and an indirect-direct evaporative cooling chiller 49; The evaporative cooling chiller 49 is connected, and the primary side circulating water pump 20 is provided on the primary side return pipe 18 . The indirect-direct evaporative cooling chiller 49 is connected to the plate heat exchanger 17 through the primary side water supply pipe 19 and the return water pipe 18 to form a circulation loop.

The main function of the indirect-direct evaporative cooling chiller 49 is to cool the coolant in the liquid cooling module 4, and the high-temperature cold water produced by the indirect-direct evaporative cooling chiller 49 indirectly cools the high-temperature coolant through the plate heat exchanger 17 and absorbs the high-temperature cold water. The heated primary cooling water returns to the indirect-direct evaporative cooling chiller 49 for heat dissipation, thus forming a cycle.

The indirect-direct evaporative cooling chiller 49 includes an organic unit casing b. Air inlets 59 are symmetrically arranged on the two opposite side walls of the unit casing b. A direct evaporative cooling unit is arranged in the middle of the unit casing b. The indirect evaporative cooling unit is symmetrically arranged on both sides;

The direct evaporative cooling unit includes a direct section exhaust fan 51, a water baffle 50, a water distributor b53, a filler b54 and a water collecting tank c64 arranged in sequence from top to bottom; the water distributor b53 is connected to the water collecting tank c64 through a second water pipe; The top wall of the unit casing b corresponding to the direct section exhaust fan 51 is provided with a direct section exhaust port 52; the filler b54 can be made of paper fiber, PVC, metal aluminum foil or the like.

The indirect evaporative cooling unit includes an indirect section exhaust fan 56, a water distributor c57, an indirect evaporative cooler b63 and a water collecting tank b62, which are arranged in sequence from top to bottom. The water distributor c57 is connected to the water collecting tank b62 through the water supply pipe b58, and the water supply pipe The b58 is also provided with a circulating water pump b61, and an indirect section air outlet 55 is set on the top wall of the unit housing b corresponding to the indirect section exhaust fan 56; the indirect evaporative cooler b63 can be plate-fin type, horizontal tube, vertical Either a pipe or a dew point indirect cooler.

One end of the primary side water supply pipe 19 is connected to the plate heat exchanger 17, and the other end of the primary side water supply pipe 19 is connected to the collecting tank c64; one end of the primary side water return pipe 18 is connected to the plate heat exchanger 17, and the The other end is connected to the water distributor b53.

An air filter c60 is provided at the air inlet.

The present invention is based on an evaporative cooling air-conditioning system for a data center of an air-cooled and water-cooled composite unit, and its working process is as follows:

According to the working process of the air-cooling form: the hot air in the hot aisle 11 enters the return air duct 9 from the return air port 10, and enters the air-conditioning unit 27 combined with indirect evaporative cooling and mechanical refrigeration through the return air duct 8. At this time, according to the outdoor meteorological parameters Running the indirect evaporative cooler a29 of the indirect evaporative cooling module and the evaporator 35 of the mechanical refrigeration module can switch between dry mode, wet mode and mixed mode, thereby cooling the return air of data center 1, and the cooled air is The air supply duct 6 enters the floor air supply duct 5, and then is sent into the cold aisle 12 from the air supply port 13 to cool the server cabinet 2 and the surrounding environment. The air duct 9 forms a circulation in this way, so as to realize the cooling effect in the room of the data center.

Dry mode, wet mode and mixed mode are the three operating modes of the air-conditioning unit 27 combined with indirect evaporative cooling and mechanical refrigeration. During the operating time of the indirect evaporative cooling module, the evaporative cooler a29 is connected without spraying water, which is the dry mode, and the spraying water is Wet mode, a hybrid mode when the evaporator 35 of the mechanical refrigeration module is operating.

According to the working process of water cooling: it can be divided into primary side water cooling and secondary side liquid cooling.

(1) Working process of primary side water cooling: indirect-direct evaporative cooling chiller 49 produces high-temperature cold water, and the power provided by the primary side circulating water pump 20 flows from the primary side water supply pipe 19 through the plate heat exchanger 17 in exchange for the secondary side The heat of the cooling liquid is returned to the indirect-direct evaporative cooling chiller 49 through the primary side return pipe 18, and the cold water produced by the evaporative cooling technology cools the cooling liquid on the secondary side of the plate heat exchanger 17. This forms a cycle.

The indirect-direct evaporative cooling chiller 49 mainly includes an indirect section and a direct section. The indirect evaporative cooler b63 of the indirect section pre-cools the air entering the indirect-direct evaporative cooling chiller 49, and the pre-cooled air then enters the direct section. The filler b54 exchanges heat and moisture with the high-temperature cooling water after heat exchange, thereby lowering the temperature of the cooling water.

(2) Working process of secondary side liquid cooling: after the cooling liquid installed in the liquid cooling plate 22 on the back of the heating chip of the server 3 absorbs the heat of the chip, it converges from the liquid outlet pipe 24 to the current collector 25, and then passes through the secondary liquid return The pipe 15 returns to the plate heat exchanger 17 to be cooled by the primary side, and the cooled cooling liquid is transported to the diverter 26 of each liquid cooling module 4 through the secondary side water supply pipe under the action of the secondary side circulating water pump 16 , enter the liquid cooling plate 22 through the liquid inlet pipe 23, and continue to cool the server 3 chip.

Between the primary side water cooling loop and the secondary side liquid cooling loop is a plate heat exchanger 17. The primary side water cools the secondary side cooling liquid, so as to take away the heat of the heating chip of the server 3 in a water-cooled manner to realize the chip stage cooling.

Claims (10)

1. Evaporative cooling air conditioning system for data center based on air cooling and water cooling composite unit, characterized by, including water side evaporative cooling unit (21), wind side evaporative cooling unit (7) and with data center computer lab unit (1) of wind side evaporative cooling unit (7) intercommunication, data center computer lab unit (1) is connected with water side evaporative cooling unit (21) through secondary side feed pipe (14) and secondary side return pipe (15), is provided with secondary side circulating water pump (16) on secondary side feed pipe (14).

2. The evaporative cooling air conditioning system for the data center based on the air cooling and water cooling combined unit as claimed in claim 1, wherein the air side evaporative cooling unit (7) comprises an air conditioning unit (27) combining indirect evaporative cooling and mechanical refrigeration, an air supply pipe (6) and a return air pipe (8); the air conditioning unit (27) combining indirect evaporative cooling and mechanical refrigeration is communicated with the data center machine room unit (1) through the blast pipe (6) and the return air pipe (8).

3. The evaporative cooling air-conditioning system for the data center based on the air-cooling and water-cooling combined unit as claimed in claim 2, wherein the air-conditioning unit (27) combining indirect evaporative cooling and mechanical refrigeration comprises a unit casing a, two opposite side walls of the unit casing a are respectively provided with a primary air inlet (28) and a primary air outlet (37), and an air filter a (48), an indirect evaporative cooling section, a humidifying section, an evaporator (35) and a primary air blower (36) are sequentially arranged in the unit casing a according to the flowing direction of primary air after entering; a condenser (32) is arranged above the indirect evaporative cooling section, a secondary air exhaust outlet (30) is arranged on the top wall of the unit shell a corresponding to the upper part of the condenser (32), a secondary air exhaust fan (31) is arranged at the position of the secondary air exhaust outlet (30), secondary air inlets (46) are arranged on the side walls of the unit shell a corresponding to the two opposite sides of the indirect evaporative cooling section, and an air filter b (45) is arranged at the position of each secondary air inlet (46); an expansion valve (38) and a compressor (39) are further arranged below the evaporator (35), and the condenser (32), the expansion valve (38), the compressor (39) and the evaporator (35) are connected through pipelines to form a closed loop.

4. The evaporative cooling air conditioning system for the data center based on the air-cooling and water-cooling combined unit as claimed in claim 3, wherein the indirect evaporative cooling section comprises an indirect evaporative cooler a (29), a high-pressure spray water distributor (47) and a water collection tank a (44) which are sequentially arranged from top to bottom, a nozzle on the high-pressure spray water distributor (47) faces the indirect evaporative cooler a (29), and the high-pressure spray water distributor (47) is connected with the water collection tank a (44) through a water supply pipe a (43); a circulating water pump a (42) is also arranged on the water supply pipe a (43), and secondary air inlets (46) are arranged on two opposite side walls of the unit shell a corresponding to the space between the high-pressure spray water distributor (47) and the water collection tank a (44).

5. The evaporative cooling air conditioning system for the data center based on the air-cooling and water-cooling combined unit as claimed in claim 3, wherein the humidification section comprises a water distributor a (33), a filler a (34) and a water collection tank c (40) which are sequentially arranged from top to bottom, and the water distributor a (33) is connected with the water collection tank c (40) through a first water pipe; and a circulating water pump c (41) is also arranged on the first water pipe.

6. The evaporative cooling air conditioning system for the data center based on the air-cooling and water-cooling combined unit as claimed in claim 3, wherein the data center room unit (1) comprises an air return duct (9) arranged at the top of the data room, and a floor air supply duct (5) arranged below the floor of the data room; the air return duct (9) is connected with a primary air supply outlet (37) through an air return pipe (8), and the floor air supply duct (5) is connected with a primary air inlet (28) through an air supply pipe (6); the system is characterized by further comprising a plurality of groups of server unit modules arranged in the data center machine room and positioned between the air return duct (9) and the floor air supply duct (5), wherein each group of server unit modules consists of two server cabinets (2), the air outlet sides of two adjacent server unit modules are arranged oppositely, a hot channel (11) is formed between the air outlet sides of the two adjacent server unit modules, and a cold channel (12) is formed between the two groups of server cabinets (2) in each group of server unit modules; a plurality of air return ports (10) are arranged on the air return channel (9), and the hot channel (11) is communicated with the air return channel (9) through the air return ports (10); the floor air supply duct (5) is provided with a plurality of air supply outlets (13), and the cold channel (12) is communicated with the floor air supply duct (5) through the air supply outlets (13); and each server cabinet (2) is also provided with a liquid cooling module (4) for cooling the heating chips of the servers (3), the liquid cooling modules (4) are in one-to-one correspondence with the server cabinets (2), and each liquid cooling module (4) is connected with a water side evaporative cooling unit (21) through a secondary side liquid supply pipe (14) and a secondary side liquid return pipe (15).

7. The evaporative cooling air conditioning system for the data center based on the air cooling and water cooling combined unit as claimed in claim 6, wherein the liquid cooling module (4) comprises a current collector (25), a current divider (26) and a plurality of liquid cooling plates (22), each liquid cooling plate (22) is connected with the current divider (26) through a liquid inlet pipe (23), each liquid cooling plate (22) is connected with the current collector (25) through a liquid outlet pipe (24), the current collector (25) is further connected with a secondary side liquid return pipe (15), the current divider (26) is further connected with a secondary side liquid supply pipe (14), and the liquid cooling plates (22) correspond to the servers (3) one to one.

8. The evaporative cooling air conditioning system for data centers based on the combined air-cooling and water-cooling unit as claimed in claim 6, wherein the water side evaporative cooling unit (21) comprises a plate heat exchanger (17) and an indirect-direct evaporative cooling water chilling unit (49); the plate heat exchanger (17) is connected with an indirect-direct evaporative cooling water chilling unit (49) through a primary side water return pipe (18) and a primary side water supply pipe (19), and a primary side circulating water pump (20) is arranged on the primary side water return pipe (18).

9. The evaporative cooling air conditioning system for data centers based on the air-cooling and water-cooling combined unit as claimed in claim 8, wherein the indirect-direct evaporative cooling water chilling unit (49) comprises a unit housing b, air inlets (59) are symmetrically arranged on two opposite side walls of the unit housing b, a direct evaporative cooling unit is arranged in the middle of the inside of the unit housing b, and indirect evaporative cooling units are symmetrically arranged on two sides of the direct evaporative cooling unit;

the direct evaporative cooling unit comprises a direct section exhaust fan (51), a water baffle (50), a water distributor b (53), a filler b (54) and a water collecting tank c (64) which are sequentially arranged from top to bottom; the water distributor b (53) is connected with the water collecting tank c (64) through a second water pipe; a direct section air outlet (52) is arranged on the top wall of the unit shell (b) corresponding to the upper part of the direct section exhaust fan (51);

the indirect evaporative cooling unit comprises an indirect section exhaust fan (56), a water distributor c (57), an indirect evaporative cooler b (63) and a water collecting tank b (62) which are sequentially arranged from top to bottom, the water distributor c (57) is connected with the water collecting tank b (62) through a water supply pipe b (58), a circulating water pump b (61) is further arranged on the water supply pipe b (58), and an indirect section exhaust outlet (55) is formed in the top wall of the unit shell b corresponding to the upper portion of the indirect section exhaust fan (56);

one end of the primary water supply pipe (19) is connected to the plate heat exchanger (17), and the other end of the primary water supply pipe (19) is connected to the water collection tank c (64); one end of the primary side water return pipe (18) is connected with the plate heat exchanger (17), and the other end of the primary side water return pipe (18) is connected with the water distributor b (53).

10. The evaporative cooling air conditioning system for data centers based on combined air-cooling and water-cooling unit as claimed in claim 9, wherein an air filter c (60) is provided at the air intake.

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