CN211345639U - Air conditioning system for data center combining evaporative cooling and lithium bromide absorption refrigeration - Google Patents

Abstract

The utility model discloses an air conditioning system for a data center which combines evaporative cooling and lithium bromide absorption refrigeration. The indirect evaporative cooling unit is connected to the lithium bromide absorption chiller module of the circulation loop through the chilled water supply pipe and the chilled water return pipe. The utility model combines evaporative cooling and lithium bromide absorption refrigeration with an air-conditioning system for a data center. The evaporative cooling and lithium bromide absorption refrigeration are combined. The lithium bromide absorption chiller recycles and utilizes a large amount of heat in the data room as a heat source, and produces cold water as indirect evaporation. The cooling air-conditioning unit performs auxiliary cooling and cooling, thereby meeting the cooling demand of the data center throughout the year with low energy consumption.

Description

Air conditioning system for data centers combining evaporative cooling and lithium bromide absorption cooling

technical field

The utility model belongs to the technical field of air conditioning equipment, and relates to an air conditioning system for a data center which combines evaporative cooling and lithium bromide absorption refrigeration.

Background technique

With the rapid development of data services and networks, the scale of the data center continues to expand, and the power consumption of the data center is also increasing. The power consumption of the data center computer room is the air conditioner, the air supply system, and the environmental conditioning equipment, which consumes the most power. It accounts for about 45% of the total power of the computer room. Therefore, the use of energy-saving cooling methods is an urgent need for energy-saving and emission-reduction in data centers.

From the perspective of energy saving, there are currently solutions that directly use the outdoor cold source—outdoor fresh air to cool the computer room, and indirectly use the outdoor cold source—the runner heat recovery or the cold water system to cool the computer room.

When using outdoor fresh air as the cooling source, in order to ensure the cleanliness of the fresh air, the unit needs to be equipped with a medium-efficiency filter and a chemical filter. Among them, the chemical filter is very expensive and cannot be cleaned and reused, resulting in a very high investment cost and operating cost of the unit. Large; when using runner heat recovery for natural cooling, because the volume of the runner heat recovery air conditioner is too large, it is necessary to design a separate area for the runner heat recovery air conditioner unit, the on-site installation engineering is large, and the construction investment is large; when using a cold water system During natural cooling, the air-conditioning equipment needs to be equipped with an outdoor water tower, and only when the outlet water temperature of the water tower is 2 to 5°C lower than the temperature of the chilled water (usually 7°C), can the use of the compressor be stopped, and the cooling water from the water tower is used to directly cool the air conditioner. However, since the temperature of the treated water is higher than 5 ℃ most of the year, the time period when the outdoor natural cooling source can be directly used is short, the energy saving is not large, and the pipeline is complicated when the cold water system is used for natural cooling. , the operation and maintenance workload is heavy.

Utility model content

The purpose of this utility model is to provide an air-conditioning system for a data center that combines evaporative cooling and lithium bromide absorption refrigeration. The evaporative cooling is combined with lithium bromide absorption refrigeration. The cold water is taken for the indirect evaporative cooling air-conditioning unit for auxiliary cooling and cooling, thereby meeting the cooling demand of the data center throughout the year with low energy consumption.

The technical scheme adopted by the utility model is that the air-conditioning system for a data center combining evaporative cooling and lithium bromide absorption refrigeration includes an indirect evaporative cooling unit, and the indirect evaporative cooling unit is connected with the indirect evaporative cooling unit through a return air duct and an air supply duct to form a circulation loop. The machine room and the lithium bromide absorption chiller module connected with the indirect evaporative cooling unit through the chilled water supply pipe and the chilled water return pipe to form a circulation loop;

The indirect evaporative cooling unit includes a unit casing. The two side walls corresponding to the unit casing are respectively provided with a primary air inlet and a primary air supply outlet. The unit casing is sequentially provided with an air filter a and an indirect evaporative cooling according to the flow direction of the primary air. unit, direct evaporative cooling unit, serpentine cooling coil and primary air supply fan, the serpentine cooling coil is connected with the lithium bromide absorption chiller module through the chilled water supply pipe and chilled water return pipe to form a circulation loop, return air pipe and supply air The pipes are respectively connected with the primary air inlet and the primary air supply outlet;

There are multiple server cabinet groups in the data room, each server cabinet group is composed of two server cabinets, and the air outlet sides of the two server cabinets are arranged opposite to each other, and a hot channel is formed between the air outlet sides of the two server cabinets. After all the hot aisles are merged, they are connected to the return air duct. The rest of the space in the equipment room is used as the cold aisle, and the supply air duct is connected to the cold aisle.

The utility model is also characterized in that,

The indirect evaporative cooling unit includes a standpipe indirect evaporative cooling heat exchanger. Above the standpipe indirect evaporative cooling heat exchanger, a high-pressure spray water distributor a, a secondary air exhaust fan and a secondary air exhaust port are sequentially arranged from bottom to top. An air filter b is arranged under the indirect evaporative cooling heat exchanger of the standpipe, and secondary air inlets are also arranged on the two side walls of the unit casing corresponding to the lower part of the air filter b. The water tank b is connected to the high-pressure spray water distributor a through the water pipe a, and the high-pressure spray water distributor a sprays the indirect evaporative cooling heat exchanger on the plate riser.

The water pipe a is also provided with a water pump b.

The direct evaporative cooling unit includes a filler, a high-pressure spray water distributor b is arranged above the filler, and a water collecting tank a is arranged below the filler. .

The water pipe b is also provided with a water pump a.

The lithium bromide absorption chiller module includes an evaporator, an absorber, a generator and a condenser that are connected in sequence and form a loop. The absorber and the generator are bidirectionally connected through a solution heat exchanger, and the generator is also connected through a heat source water supply pipe and a heat source return pipe. The water pipe is connected with the heat recovery device and forms a circulation loop with the heat recovery device. The evaporator is connected to the serpentine cooling coil through the chilled water supply pipe and the chilled water return pipe to form a circulation loop. The heat recovery device is located in the return air pipe.

A throttle valve is also arranged on the fourth communication pipe from the condenser to the evaporator.

A solution pump is also arranged on the second communication pipe from the absorber to the generator.

The beneficial effects of the present utility model are:

(1) the utility model combines evaporative cooling with lithium bromide absorption refrigeration, the lithium bromide absorption chiller recycles a large amount of heat in the data room as a heat source, and making cold water is that the indirect evaporative cooling air-conditioning unit carries out auxiliary cooling and cooling, and then meets the requirements of the data center. annual cooling demand.

(2) The utility model utilizes the wind-side indirect evaporative cooling technology to cool down the data computer room, ensures the temperature and humidity range of the computer room without mixing with the outside air, and ensures the air quality requirements of the computer room.

(3) The utility model utilizes natural cooling energy and equipment heat dissipation, realizes the effective utilization of low-grade energy, reduces the energy consumption of the air conditioning system, and achieves the effect of maximizing energy saving.

(4) Compared with the air-conditioning water system, the utility model has the advantages of simple system form, short construction period and easy maintenance and operation.

Description of drawings

Fig. 1 is the structural representation of the data center air-conditioning system of the present invention in conjunction with evaporative cooling and lithium bromide absorption refrigeration;

2 is a schematic structural diagram of a lithium bromide absorption chiller module in an air-conditioning system for a data center that combines evaporative cooling and lithium bromide absorption refrigeration according to the present invention.

In the figure, 1. Return air duct, 2. Primary air inlet, 3. Air filter a, 4. Indirect evaporative cooling heat exchanger for riser, 5. High pressure spray water distributor a, 6. Secondary air exhaust fan , 7. Secondary air outlet, 8. Water pipe a, 9. Water pipe b, 10. High pressure spray water distributor b, 11. Serpentine cooling coil, 12. Primary air supply fan, 13. Primary air supply port, 14. Packing, 15. Water collection tank a, 16. Water pump a, 17. Water collection tank b, 18. Water pump b, 19. Air filter b, 20. Secondary air inlet, 21. Chilled water supply pipe, 22. Chilled water return pipe, 23. Evaporator, 24. Lithium bromide absorption chiller module, 25. Generator, 26. Heat source water supply pipe, 27. Heat source return pipe, 28. Heat recovery device, 29. Air supply pipe, 30. Cold aisle, 31. Hot aisle, 32. Server cabinet, 33. First communication pipe, 34. Condenser, 35. Throttle valve, 36. Fourth communication pipe, 37. Absorber, 38. Solution pump, 39. Solution heat exchanger, 40. Second connecting pipe, 41. Third connecting pipe, 42. Indirect evaporative cooling unit, 43. Data room.

Detailed ways

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

A data center air-conditioning system that combines evaporative cooling and lithium bromide absorption refrigeration, including an indirect evaporative cooling unit 42, a data computer room 43 that is connected to the indirect evaporative cooling unit 42 through the return air duct 1 and the air supply duct 29 to form a circulation loop, and an indirect evaporative cooling unit 43. The cooling unit 42 is connected to the lithium bromide absorption chiller module 24 forming a circulation loop through the chilled water supply pipe 21 and the chilled water return pipe 22;

The indirect evaporative cooling unit includes a unit casing. The two side walls corresponding to the unit casing are respectively provided with a primary air inlet 2 and a primary air supply port 13. In the unit casing, according to the primary air flow direction, an air filter a3, an indirect Evaporative cooling unit, direct evaporative cooling unit, serpentine cooling coil 11 and primary air blower 12, the serpentine cooling coil 11 and the lithium bromide absorption chiller module 24 are connected to form a circulation through the chilled water supply pipe 21 and the chilled water return pipe 22 In the circuit, the return air duct 1 and the air supply duct 29 are respectively connected with the primary air inlet 2 and the primary air supply port 13;

A plurality of server cabinet groups are arranged in the data room 43 , each server cabinet group is composed of two server cabinets 32 , and the air outlet sides of the two server cabinets 32 are arranged opposite to each other, between the air outlet sides of the two server cabinets 20 . A hot aisle 31 is formed, all the hot aisles 31 are confluent and connected to the return air duct 1 , the remaining space in the machine room 18 is used as a cold aisle 30 , and the air supply duct 29 is connected to the cold aisle 30 .

The indirect evaporative cooling unit includes a standpipe indirect evaporative cooling heat exchanger 4, and a high-pressure spray water distributor a5, a secondary air exhaust fan 6 and a secondary air exhauster are sequentially arranged above the standpipe indirect evaporative cooling heat exchanger 4 from bottom to top. Air outlet 7, an air filter b19 is arranged under the indirect evaporative cooling heat exchanger 4 of the standpipe, and a secondary air inlet 20 is also arranged on the two side walls of the unit casing corresponding to the lower part of the air filter b19, and the bottom of the unit casing is arranged There is a water collecting tank b17, which is connected to the high-pressure spray water distributor a5 through the water pipe a8, and the high-pressure spray water distributor a5 sprays the indirect evaporative cooling heat exchanger 4 on the plate riser.

The water pipe a8 is also provided with a water pump b18.

The direct evaporative cooling unit includes a filler 14, a high-pressure spray water distributor b10 is arranged above the filler 14, and a water collection tank a15 is arranged below the filler 14. The water collection tank a15 is connected to the high-pressure spray water distributor b10 through a water pipe b9, and the high-pressure spray water distributor b10 faces. Filler 14 is sprayed.

The water pipe b9 is also provided with a water pump a16.

The lithium bromide absorption chiller module 24 includes an evaporator 23, an absorber 37, a generator 25 and a condenser 34 that are connected in sequence and form a loop. The absorber 37 and the generator 25 are bidirectionally connected through a solution heat exchanger 39, and the generator 25 is also connected to a heat recovery device 28 through a heat source water supply pipe 26 and a heat source return pipe 27 and forms a circulation loop with the heat recovery device 28, and the evaporator 23 is connected to the serpentine cooling coil 11 through the chilled water supply pipe 21 and the chilled water return pipe 22. A circulation loop is formed, the heat recovery device 28 is located in the return air pipe 1 , the pipe from the generator 25 to the absorber 37 is the third communication pipe 41 , and the pipe from the generator 25 to the condenser 34 is the first communication pipe 33 .

A throttle valve 35 is also provided on the fourth communication pipe 36 from the condenser 34 to the evaporator 23 .

A solution pump 38 is also provided on the second communication pipe 40 from the absorber 37 to the generator 25 .

The primary air supply fan 12 of the present invention is a centrifugal fan, and the secondary air exhaust fan 6 is an axial flow fan.

The airflow organization of the data room 43 of the present invention adopts the form of lowering and upper returning, and the cold aisle 30 and the hot aisle 31 are separated; the heat recovery device 28 is arranged in the return air duct 1 of the data room 43, and is used for recycling the equipment of the data room 43. Heat output.

The working principle of the evaporative cooling air conditioning system of the utility model is as follows:

The return air in the data room 43 enters the indirect evaporative cooling unit from the primary air inlet 1 through the return air duct 1. After being purified and filtered by the air filter a3, it flows through the dry channel of the indirect evaporative cooling heat exchanger 4 of the riser. After being purified and filtered by the air filter b19 through the secondary air inlet 20, it flows to the wet channel of the indirect evaporative cooling heat exchanger 4 of the standpipe, and exchanges heat with the return air in the dry channel, and the return air transfers the heat to the wet channel side. The secondary air, the primary air of the return air are cooled and cooled, and then cooled and humidified again in the direct direct evaporative cooling unit, and then cooled and cooled again by the serpentine cooling coil 11 through the power provided by the primary air blower 12, and finally cooled and humidified. The primary air is sent from the primary air supply port 13 through the air supply duct 29 into the cold aisle 30 of the data room 43. The primary air forms a circulation in this way, so as to achieve the cooling effect of the data room, and the secondary air passes through the secondary air exhaust fan. The power provided by 6, and finally the secondary air carrying heat is discharged from the secondary air exhaust port 7.

The working process of the water distribution system: the indirect evaporative cooling unit, through the power provided by the water pump b18, the water in the water collection tank b17 is transported to the high-pressure spray water distributor a5 through the water pipe a8 to the indirect evaporative cooling heat exchanger 4 of the vertical pipe. Evaporative cooling unit: powered by the water pump a16, the water in the water collection tank a15 is transported to the high-pressure spray water distributor b10 through the water pipe b9, and the high-pressure spray water distributor b10 forms a layer of water film after spraying on the spray filler 14, realizing the Humidification and further cooling of the air.

The working process of the lithium bromide absorption chiller module 24: in the absorber 37, the refrigerant vaporized in the evaporator 23 is continuously absorbed by the liquid absorbent to achieve the purpose of maintaining the low pressure in the evaporator 23; the absorbent absorbs the refrigerant The vapor forms a refrigerant-absorbent solution; the refrigerant-absorbent solution is boosted by the solution pump 38 and sent into the generator 25 by the second communication pipe 40 through the solution heat exchanger 39, and then sent out by the generator 25 along the first line. The three-connecting pipe 41 is sent back to the absorber 37. During the process of the solution heat exchanger 39 and the generator 25, the refrigerant-absorbent solution returned to the absorber 37 undergoes heat exchange, which effectively improves the entry into the generator 25. The temperature of the cold solution reduces the heat dissipated by the generator 25; in the generator 25, the heat-exchange-treated refrigerant-absorbent solution is mixed from the external heat source water supply pipe 26 connected to the heat recovery device 28 The hot water is heated to boiling, and the refrigerant with a lower boiling point is vaporized to form a high-pressure gaseous refrigerant, which is separated from the absorbent, and then the refrigerant vapor enters the condenser 34 to release heat, and then flows through the throttle valve 35. The refrigerant is liquefied to form a low-pressure liquid state The refrigerant is vaporized and absorbed heat in the evaporator 23 for cooling, and the cold water in the chilled water return pipe 22 is exchanged by the evaporator 23 and then sent to the serpentine cooling coil 11 in the air-conditioning unit through the chilled water supply pipe 21 The indoor primary air is cooled again; after the absorbent is concentrated, it returns to the absorber 37 to absorb the low-pressure gaseous refrigerant again, and the hot water after heating the refrigerant-absorbent solution returns to the data room 43 through the external heat source return pipe 27 to return to the data room 43 for return air The heat recovery device 28 in the pipeline 1 continues to recycle the heat dissipation of the equipment in the data room 43, thus forming a cycle.

The evaporative cooling air conditioning system of the utility model has three working modes, and the working process is as follows:

(1) Dry mode

In winter, when the external ambient temperature is low, the air-conditioning system operates in dry mode; at this time, the spray evaporation system of the indirect evaporative cooling unit 42 and the lithium bromide absorption chiller module 24 do not operate, and the low-temperature fresh air is fed from the secondary air. The tuyere 20 enters, is filtered by the air filter b 19, enters the inner side of the indirect evaporative cooling heat exchanger 4 of the standpipe for heat exchange, and then passes through the secondary air exhaust fan 6, and is discharged from the secondary air exhaust port 7; data room 43 The higher temperature return air first enters the unit through the primary air inlet 2, is filtered by the air filter a3, flows through the riser indirect evaporative cooling heat exchanger 4, and is directly cooled by the outdoor low-temperature fresh air. The primary air supply port 13 is then sent into the cold aisle 30 of the data room 43 through the air supply duct 29 to cool the server cabinet 32 .

(2) Wet mode

In the transition season, when the ambient temperature is relatively mild, the air-conditioning system operates in the wet mode; at this time, the spray evaporation system of the indirect evaporative cooling unit 42 operates, while the lithium bromide absorption chiller module 24 still does not operate, and the high-pressure spray water is distributed. The device a5 sprays and distributes water to the inner side of the pipe of the standpipe indirect evaporative cooling heat exchanger 4, and the low-temperature fresh air enters from the secondary air inlet 20, is filtered by the air filter b19, and enters the pipe inside the standpipe indirect evaporative cooling heat exchanger 4. After heat exchange, it is discharged from the secondary air outlet 7 through the secondary air exhaust fan 6; the higher temperature return air of the data room 43 enters the indirect evaporative cooling air conditioning unit module 42 through the return air duct 1 and the primary air inlet 2 , after being filtered by air filter a3, the outer side of the tube that flows through the indirect evaporative cooling heat exchanger 4 of the standpipe exchanges heat with the secondary air on the inner side of the tube. The air supply port 13 is sent into the data room 43 through the air supply duct 29 . According to the humidity requirements of the data room 43, the direct evaporative cooling unit can be adjusted to be turned on or off to determine whether to perform humidification.

(3) Composite mode

On hot summer days, when the outside temperature is high and the wet bulb temperature is high, the air conditioning system operates in hybrid mode. At this time, the spray evaporation system of the indirect evaporative cooling unit 42 and the lithium bromide absorption chiller module 24 operate simultaneously to achieve the required cooling capacity. The high pressure spray water distributor a5 of the spray evaporation system of the indirect evaporative cooling unit 42 is directed vertically. The inner side of the pipe of the indirect evaporative cooling heat exchanger 4 is sprayed with water; the low-temperature fresh air enters from the secondary air inlet 20, is filtered by the air filter b19, and enters the inner side of the pipe of the indirect evaporative cooling heat exchanger 4 for heat exchange. The power provided by the secondary air exhaust fan 6 is discharged from the secondary air exhaust port 7; the higher temperature return air of the data room 43 enters the indirect evaporative cooling air conditioning unit module 42 through the return air duct 1 through the primary air inlet 2, After being filtered by the air filter a3, the outer side of the tube of the indirect evaporative cooling heat exchanger 4 flows through the riser to exchange heat with the secondary air inside the tube, and then cooled by the serpentine cooling coil 11, and the cooled data room 43 returns to the air. The air is sent into the data room 43 by the primary air blower 12 through the primary air supply port 13 through the air supply duct 29, and the cycle is repeated. In this operation mode, the lithium bromide absorption chiller module 24 is used as the driving heat source of the lithium bromide absorption chiller module 24 through the heat recovery device 28 provided in the return air duct 1 .

Claims (8)

1. The air conditioning system for the data center combining evaporative cooling and lithium bromide absorption refrigeration is characterized by comprising an indirect evaporative cooling unit (42), a data machine room (43) which is connected with the indirect evaporative cooling unit (42) through an air return pipeline (1) and an air supply pipeline (29) to form a circulation loop, and a lithium bromide absorption water cooling machine module (24) which is connected with the indirect evaporative cooling unit (42) through a chilled water supply pipe (21) and a chilled water return pipe (22) to form a circulation loop;

the indirect evaporative cooling unit comprises a unit shell, wherein a primary air inlet (2) and a primary air supply outlet (13) are respectively arranged on two corresponding side walls of the unit shell, an air filter a (3), an indirect evaporative cooling unit, a direct evaporative cooling unit, a snake-shaped cooling coil (11) and a primary air supply blower (12) are sequentially arranged in the unit shell according to the primary air flow direction, the snake-shaped cooling coil (11) and the lithium bromide absorption water chiller module (24) are connected through a chilled water supply pipe (21) and a chilled water return pipe (22) to form a circulation loop, and the air return pipeline (1) and an air supply pipeline (29) are respectively connected with the primary air inlet (2) and the primary air supply outlet (13);

be provided with a plurality of server rack groups in data computer lab (43), every server rack group comprises two server racks (32), and two server racks (32) air-out sides are relative setting, forms hot passageway (31) between the air-out side of two server racks (32), all hot passageway (31) join the back and are connected with return air duct (1), other spaces in computer lab (43) are as cold passageway (30), supply-air duct (29) are connected cold passageway (30).

2. The air conditioning system for data centers as claimed in claim 1, wherein said indirect evaporative cooling unit comprises a riser indirect evaporative cooling heat exchanger (4), a high-pressure spray water distributor a (5), a secondary air exhaust fan (6) and a secondary air exhaust outlet (7) are sequentially arranged above the vertical pipe indirect evaporative cooling heat exchanger (4) from bottom to top, an air filter b (19) is arranged below the vertical pipe indirect evaporative cooling heat exchanger (4), two side walls of the unit shell corresponding to the lower part of the air filter b (19) are also provided with secondary air inlets (20), the bottom of the unit shell is provided with a water collecting tank b (17), the water collecting tank b (17) is connected with the high-pressure spray water distributor a (5) through a water pipe a (8), and the high-pressure spray water distributor a (5) sprays towards the plate vertical pipe indirect evaporative cooling heat exchanger (4).

3. The air conditioning system for the data center according to claim 2, wherein a water pump b (18) is further provided on the water pipe a (8).

4. The air conditioning system for the data center according to claim 1, wherein the direct evaporative cooling unit comprises a filler (14), a high-pressure spray water distributor b (10) is arranged above the filler (14), a water collection tank a (15) is arranged below the filler (14), the water collection tank a (15) is connected with the high-pressure spray water distributor b (10) through a water pipe b (9), and the high-pressure spray water distributor b (10) sprays towards the filler (14).

5. The air conditioning system for the data center according to claim 4, wherein a water pump a (16) is further provided on the water pipe b (9).

6. The air conditioning system for data center according to claim 1, wherein the lithium bromide absorption chiller module (24) comprises an evaporator (23), an absorber (37), a generator (25) and a condenser (34) which are connected in sequence and form a loop, the absorber (37) and the generator (25) are connected in a two-way manner through a solution heat exchanger (39), the generator (25) is further connected with a heat recovery device (28) through a heat source water supply pipe (26) and a heat source water return pipe (27) and forms a circulation loop with the heat recovery device (28), the evaporator (23) is connected with the serpentine cooling coil (11) through a chilled water supply pipe (21) and a chilled water return pipe (22) and forms a circulation loop, and the heat recovery device (28) is located in the air return pipe (1).

7. The air conditioning system for data center according to claim 6, wherein a throttle valve (35) is further provided on a fourth communication pipe (36) of the condenser (34) to the evaporator (23).

8. The air conditioning system for data center according to claim 6, wherein the second connection pipe (40) of the absorber (37) to the generator (25) is further provided with a solution pump (38).

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