CN202734118U - Large temperature difference air conditioning system used for data center heat removal - Google Patents
Large temperature difference air conditioning system used for data center heat removal Download PDFInfo
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- CN202734118U CN202734118U CN201220419266.6U CN201220419266U CN202734118U CN 202734118 U CN202734118 U CN 202734118U CN 201220419266 U CN201220419266 U CN 201220419266U CN 202734118 U CN202734118 U CN 202734118U
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Abstract
The utility model relates to a large temperature difference air conditioning system used for data center heat removal, which comprises an air-water surface cooler, a cooling tower unit, and at last two stages of mechanical compression refrigerating units, wherein the cooling tower unit comprises a heat exchanger, a circulating pump and a cooling tower, and each stage of mechanical compression refrigerating unit comprises an evaporator, a compressor, a condenser and a throttle valve; and an air inlet and an air outlet of the air-water surface cooler are connected with an air outlet and an air inlet of a data center, a water outlet of the air-water surface cooler is connected with a water inlet of an evaporator shell of the first stage cooling tower unit, a water outlet of the evaporator shell is connected with a water inlet of a next stage evaporator shell, and a water outlet of the last stage evaporator shell is connected with the water inlet of the air-water surface cooler by the other circulating pump. The large temperature difference air conditioning system can effectively reduce the circulating water supply quantity and the power consumption, and can be widely used in the heat removing process of various kinds of data centers.
Description
Technical field
The utility model relates to a kind of air-conditioning system, particularly about a kind of large temperature difference air-conditioning system for data center's heat extraction.
Background technology
Along with the development of information industry, the scale of data center and quantity are all in growth at full speed.Data center have heat generation density high, need the annual air-conditioning system of opening get rid of the characteristics such as indoor heat production, except the power consumption of information technoloy equipment, the power consumption that is used for air-conditioning system is the chief component of data center's power consumption.By various means improve air-conditioning systems operational energy efficiency, reduce the power consumption of air-conditioning system, to reducing whole data center power consumption and the propulsion energy-saving emission reduction work is significant.
Newly-built data center all is provided with hot and cold passage mostly at present, and hot and cold passage is isolated by the rack that server is housed.In the air-conditioning system running, the air-supply of processing through cooling is admitted to cold passage, air-supply is via flow through each stratum server in the rack of cold passage, with the heat exchange such as chip in the server, the wind pushing temperature behind the server of flowing through rises and enters the passage of heat and becomes air draft, and the temperature difference of air draft and air-supply is above 10 ℃.The air draft processing of lowering the temperature in passage of heat unification is sent back to the surface cooler of air-conditioning box is re-used as after the processing and sends into cold passage and carry out heat extraction.In the air-conditioning box surface cooler, although air-supply has realized the large temperature difference (above 10 ℃) operation with air draft, but supply water at present, backwater temperature difference is generally still according to 5 ℃ of temperature difference designs in the normal domestic building, thereby the water supply of whole air-conditioning system, backwater temperature difference also are 5 ℃.The temperature difference that surpasses 10 ℃ with indoor supply and exhaust is compared, and the temperature difference of water running is obviously less than normal.Less water temperature difference is so that water supply flow is bigger than normal, and water supply transmission ﹠ distribution energy consumption is larger; If realize the large temperature difference operation of water by appropriate design, in the situation that the identical cold demand that supplies just can effectively reduce the periodical feeding flow, help to reduce the distributing system energy consumption.
On the other hand, when outdoor temperature was hanged down such as winter, the air-conditioning system of at present newly-built data center mostly adopted the cooling tower mode to reduce the energy consumption of air-conditioning system.Utilize the cooling tower cooling to have more excellent efficiency level, but at present in the air-conditioning system when the little temperature difference (about the 5 ℃) operation of water, cooling tower is limited running time: the cooling water temperature that only has cooling tower to produce just can utilize cooling tower to realize cooling when enough hanging down, and just can't utilize the cooling tower cooling when the cooling water of cooling tower generation can not all satisfy the cooling demand.If can realize the large temperature difference (above the 10 ℃) operation of water, by appropriate design can make with air exhaust heat exchange after return water temperature higher, just might when conditioning in Transition Season, utilize the cooling tower cooling to satisfy part cooling demand, prolong the time of utilizing the natural cooling source cooling, improve system energy efficiency, further reduce the air conditioning energy consumption of data center's heat extraction process.
Summary of the invention
For the problems referred to above, the purpose of this utility model provides the large temperature difference air-conditioning system that is used for data center's heat extraction that a kind of periodical feeding amount is low, operational energy efficiency is high, power consumption is low.
For achieving the above object, the utility model is taked following technical scheme: a kind of large temperature difference air-conditioning system for data center's heat extraction is characterized in that: it comprises an Air-Water surface cooler, cooling tower unit, at least two-stage mechanical compression type refrigeration unit and one first circulating pump; Described cooling tower unit comprises a heat exchanger, one second circulating pump and a cooling tower, the heat exchanger tube delivery port of described heat exchanger connects the import of described the second circulating pump, described the second circulation delivery side of pump connects described cooling tower water inlet, and the delivery port of described cooling tower connects the heat exchanger tube water inlet of described heat exchanger; The described mechanical compression type refrigeration unit of every one-level comprises an evaporimeter, a compressor, a condenser and a choke valve; After cold-producing medium enters the heat exchanger tube heat radiation of described condenser through described compressor, the heat exchanger tube heat absorption that enters described evaporimeter through described choke valve; The exhaust outlet at the air inlet connection data center of described Air-Water surface cooler housing, the air inlet at the air outlet connection data center of described Air-Water surface cooler housing; The heat exchanger tube delivery port of described Air-Water surface cooler connects the water inlet of the heat exchanger shell of described cooling tower unit, the delivery port of described heat exchanger shell connects the water inlet of the evaporator shell of the described mechanical compression type refrigeration unit of the first order, the delivery port of the evaporator shell of the described mechanical compression type refrigeration unit of the first order connects the water inlet of the evaporator shell of the described mechanical compression type refrigeration unit of next stage, and the delivery port of the evaporator shell of the described mechanical compression type refrigeration unit of afterbody connects the heat exchanger tube water inlet of described Air-Water surface cooler through described the first circulating pump.
Described Air-Water surface cooler comprises a housing, be provided with some fins that are arranged in parallel in the described housing, described fin vertically is equipped with some row snakelike heat exchange tubes, each is listed as the inlet parallel of described snakelike heat exchange tube on same water inlet collector, and described water inlet collector is as the heat exchanger tube water inlet that passes described Air-Water surface cooler housing; Each outlet that is listed as described snakelike heat exchange tube is connected in parallel on the same water outlet collector, and described water outlet collector is as the heat exchanger tube delivery port that passes described Air-Water surface cooler housing.
The described snakelike heat exchange tube of every row by from top to bottom, pass some straight tubes of each fin, and the elbow that connects two adjacent straight tubes forms, each described elbow projection on described fin all has an inclination angle with vertical direction.
Described cooling tower adopts the cooling tower with the precooling module.
Described mechanical refrigeration compression unit is set to more than three grades.
The utility model is owing to taking above technical scheme, it has the following advantages: 1, the utility model is owing to being provided with an Air-Water surface cooler in system, with the heat exchanger tube of Air-Water surface cooler successively with a cooling tower unit, at least two-stage mechanical compression type refrigeration unit with is connected circulating pump and is connected, being connected with row, the air inlet of data center into and out of the air port Air-Water surface cooler housing simultaneously, in the Air-Water surface cooler, water and air are countercurrent flow generally, have therefore realized the large temperature difference heat transfer process above 10 ℃ of water and air.2, the utility model is owing to being provided with simultaneously a cooling tower unit and two-stage mechanical compression type refrigeration unit at least, therefore can be according to the variation of Various Seasonal temperature, adopt different cooling modes to produce cooling water, such as only open mechanical compression type refrigeration units at different levels in summer, only open in the winter time the cooling tower unit, and in the winter, the transition season in summer can according to circumstances be opened the cooling tower unit simultaneously, open again the mechanical compression type refrigeration unit of certain progression, thereby realize the more heat transfer process of coupling, in the situation that identical for the cold demand, effectively reduce periodical feeding flow and distributing system energy consumption.3, cooling tower of the present utility model is selected the cooling tower with the precooling module, can effectively reduce the leaving water temperature of cooling water, prolong the time of utilizing the natural cooling source cooling, so the utility model can effectively improve the operational energy efficiency of air-conditioning system.4, the utility model has an inclination angle in projection and the vertical direction of each elbow on fin of snakelike heat exchange tube, therefore, the adjacent straight tube of snakelike heat exchange tube is not on same plane, but some similar helical disk tubulose can increase the heat exchange area with air.The utility model operational energy efficiency is high, and has effectively reduced periodical feeding flow and power consumption, and it can be widely used in the heat extraction process of various big-and-middle-sized data centers.
Description of drawings
Fig. 1 is structural representation of the present utility model
Fig. 2 is that the master of Air-Water surface cooler structure looks schematic diagram
Fig. 3 is the schematic side view of Air-Water surface cooler structure
Fig. 4 is the structural representation of the utility model when moving in the winter time
Fig. 5 is the utility model structural representation in conditioning in Transition Season when operation between winter, summer
Fig. 6 is the structural representation of the utility model when summer operation
The specific embodiment
Below in conjunction with accompanying drawing and example the utility model is described in detail.
As shown in Figure 1, the utility model system comprises an Air-Water surface cooler 1, cooling tower unit 2, at least two-stage mechanical compression type refrigeration unit 3 and the first circulating pump 4.Wherein: cooling tower unit 2 comprises the second circulating pump 4, a cooling tower 5 and a heat exchanger 6; The heat exchanger tube delivery port of heat exchanger 6 connects the import of the second circulating pump 4, and the outlet of the second circulating pump 4 connects the water inlet of cooling tower 5, and the delivery port of cooling tower 5 connects the heat exchanger tube water inlet of heat exchanger 6.Every one-level mechanical compression type refrigeration unit 3 comprises a compressor 7, a condenser 8, a choke valve 9 and an evaporimeter 10, and wherein condenser 8 can adopt air-cooled or water-cooled condenser; After the compressed machine 7 of cold-producing medium enters the heat exchanger tube heat radiation of condenser 8, enter the heat exchanger tube heat absorption of evaporimeter 10 through choke valve 9.
Such as Fig. 2, shown in Figure 3, Air-Water surface cooler 1 comprises a housing 11, is provided with air inlet 12 at the top of housing 11, is provided with air outlet 13 in the bottom of housing.In housing 11, be provided with some fins that are arranged in parallel 14, vertically with each fin 14 be equipped with some row snakelike heat exchange tubes 15.The inlet parallel of each row snakelike heat exchange tube 15 is on same water inlet collector 16, and water inlet collector 16 is as the heat exchanger tube water inlet that passes housing 11; The outlet of each row snakelike heat exchange tube 15 is connected in parallel on the same water outlet collector 17, and water outlet collector 17 is as the heat exchanger tube delivery port that passes housing 11.
Above-mentioned snakelike heat exchange tube 15 be by from top to bottom, pass some straight tubes of each fin 14, and the elbow 18 that connects two adjacent straight tubes forms.Each elbow 18 projection on fin 14 of the present utility model all can not taked vertical setting, and have an inclination angle with vertical direction, the adjacent straight tube of the snakelike heat exchange tube 15 that forms so is not on same plane, but some similar helical disk tubulose can increase the heat exchange area with air.
As shown in Figure 1 and Figure 2, Air-Water surface cooler 1 is used for realizing the cooling of air and the large temperature difference operation of empty G﹠W; Cooling tower unit 2 and mechanical compression type refrigeration unit 3 are used for realization to the cooling of backwater.The exhaust outlet at the air inlet 12 connection data centers of the housing 11 of Air-Water surface cooler 1, the air inlet at the air outlet 13 connection data centers of housing 11.The water outlet collector 17 of Air-Water surface cooler 1 connects the water inlet of heat exchanger 6 housings of cooling tower unit 2, the delivery port of heat exchanger 6 housings connects the water inlet of evaporimeter 10 housings of first order mechanical compression type refrigeration unit 3, the delivery port of these evaporimeter 10 housings connects the water inlet of evaporimeter 10 housings of next stage mechanical compression type refrigeration unit 3, and the delivery port of evaporimeter 10 housings of afterbody mechanical compression type refrigeration unit 3 connects the water inlet collector 16 of Air-Water surface cooler 1 through the first circulating pump 4.
Approximately 25 ℃ backwater flows into the water inlet of heat exchanger 6 housings of cooling tower unit 2 from the water outlet collector 17 of Air-Water surface cooler 1, and backwater carries out heat exchange with cooling water that cooling tower 5 produces in heat exchanger 6, and return water temperature reduces.When the temperature of backwater can not reach 15 ℃, need to open first order mechanical compression type refrigeration unit 3.The backwater that the delivery port of heat exchanger 6 housings from cooling tower unit 2 flows out enters the water inlet of evaporimeter 10 housings in the first order mechanical compression type refrigeration unit 3, and backwater carries out heat exchange at evaporimeter 10 and cold-producing medium, and backwater is lowered the temperature again.When the temperature of backwater still can not reach 15 ℃, need to open the mechanical compression type refrigeration unit 3 of next stage, backwater is further lowered the temperature.When the temperature of backwater reached 15 ℃, backwater became water supply, supplied water and entered the water inlet collector 16 of Air-Water surface cooler 1 by the first circulating pump 4.
Such as Fig. 1, shown in Figure 3, in Air-Water surface cooler 1, approximately 15 ℃ water supply is diverted to the import of each row snakelike heat exchange tube 15 by water inlet collector 16, supply water and in each row snakelike heat exchange tube 15, flow from bottom to top, air outside water supply and each row snakelike heat exchange tube 15 carries out becoming approximately 25 ℃ of backwater after the heat exchange, and backwater then is pooled in the water outlet collector 17 by the outlet of each row snakelike heat exchange tube 15.Approximately 30 ℃ the air draft that data center discharges is entered in the housing 11 by the air inlet 12 of housing 11, air draft is flowed from top to bottom, water supply in air draft and each the row snakelike heat exchange tube 15 is carried out becoming after the heat exchange and is about 20 ℃ of air-supplies, air outlet 13 by housing 11 enters data center, carries out heat exchange with heat-producing device in the data center.
In Air-Water surface cooler 1, approximately 15 ℃ water supply and approximately 30 ℃ air draft carry out heat exchange, the flow direction of water from bottom to top, the flow direction of air from top to bottom, water and air are countercurrent flow generally, become the air draft that temperature is about 20 ℃ after the air-supply heat exchange, become approximately 25 ℃ backwater of temperature after the water supply heat exchange, the temperature difference between air-supply and air draft surpasses 10 ℃, and the temperature difference between water supply and backwater also meets or exceeds 10 ℃ simultaneously.In Air-Water surface cooler 1, the countercurrent flow of water and air has guaranteed heat transfer effect, has realized the large temperature difference heat transfer process of water and air.
In above-described embodiment, cooling tower 5 can adopt conventional or with the cooling tower of precooling module.When adopting the latter, by the precooling module is set, can be so that the minimum cold water leaving water temperature of cooling tower 5 reach the dew-point temperature of inlet air in theory, actual leaving water temperature may be lower than the wet-bulb temperature of inlet air.After cooling tower 5 arranges the precooling module, can effectively reduce the leaving water temperature of cooling water, prolong the time of utilizing the natural cooling source free cold supply, improve the whole year operation performance of heat extraction process.
In above-described embodiment, mechanical compression type refrigeration unit 3 can according to ambient temperature, arrange two-stage or multistage.Two-stage mechanical compression type refrigeration unit 3 being set as example, approximately 25 ℃ backwater is at first in the evaporimeter 10 of first order mechanical compression type refrigeration unit 3 for temperature, and temperature is reduced to about 20 ℃; Then, enter in the evaporimeter 10 of second level mechanical compression type refrigeration unit 3, backwater continues to be cooled to about 15 ℃ again, and backwater becomes water supply, supplies water to be sent back to water inlet collector 16 in the Air-Water surface cooler 1 by the first circulating pump 4.
The characteristics that the utility model is can be according to the outdoor temperature of Various Seasonal different are by effectively combining cooling tower cooling mode and mechanical compression type cooling mode, with the operational energy efficiency that improves air-conditioning system, the power consumption that reduces air-conditioning system.The below is illustrated respectively:
As shown in Figure 4, when outdoor temperature was hanged down such as winter, cooling tower unit 2 can satisfy whole cooling demands, can close mechanical compression type refrigeration units 3 at different levels.Between the delivery port of heat exchanger 6 housings of cooling tower unit 2 and 4 imports of the first circulating pump, be communicated with a water pipe, start cooling tower unit 2 and the first circulating pump 4.This moment, approximately 25 ℃ backwater carried out heat exchange with cooling water that cooling tower 5 produces in heat exchanger 6, and return water temperature is reduced to approximately 15 ℃, has namely satisfied the cooling demand.
As shown in Figure 5, the conditioning in Transition Season between winter, summer, cooling tower unit 2 can't satisfy whole cooling demands, can open 3 pairs of backwater of one-level mechanical compression type refrigeration unit and lower the temperature, and have realized effective combination of cooling tower mode and mechanical compression type cooling mode.At first between the delivery port of the housing of the evaporimeter 10 of first order mechanical compression type refrigeration unit 3 and 4 imports of the first circulating pump, be communicated with a water pipe, open cooling tower unit 2, the first circulating pump 4 and first order mechanical compression type refrigeration unit 3.This moment, approximately 25 ℃ the first cooling water that produces with cooling tower 5 in heat exchanger 6 of backwater carried out heat exchange, after return water temperature is reduced to approximately 20 ℃, the evaporimeter 10 of backwater in mechanical compression type refrigeration unit 3 further lowered the temperature, and reaches about 15 ℃, namely satisfied the cooling demand.
As shown in Figure 6, in the time can't using cooling tower mode cooling summer, must all adopt mechanical compression type cooling mode that backwater is lowered the temperature.At first close cooling tower unit 2; Then between the water inlet of the delivery port of Air-Water surface cooler 1 water outlet collector 17 and the housing of the evaporimeter 10 of first order mechanical compression type refrigeration unit 3, be communicated with a water pipe; Open at last mechanical compression type refrigeration units 3 at different levels and the first circulating pump 4.Progressively lowered the temperature in the evaporimeter 10 mechanical compression type refrigeration units 3 at different levels successively from the backwater that Air-Water surface cooler 1 water outlet collector 17 flows out, reached about 15 ℃, namely satisfied the cooling demand.Because backwater operates under the large temperature difference, mechanical compression type refrigeration units 3 at different levels can be realized different evaporating pressures, help to improve the efficiency of processing procedure.
The various embodiments described above only are used for explanation the utility model; wherein the structure of each parts, connected mode etc. all can change to some extent; every equivalents and improvement of carrying out on the basis of technical solutions of the utility model all should do not got rid of outside protection domain of the present utility model.
Claims (6)
1. large temperature difference air-conditioning system that is used for data center's heat extraction is characterized in that: it comprises an Air-Water surface cooler, cooling tower unit, at least two-stage mechanical compression type refrigeration unit and one first circulating pump;
Described cooling tower unit comprises a heat exchanger, one second circulating pump and a cooling tower, the heat exchanger tube delivery port of described heat exchanger connects the import of described the second circulating pump, described the second circulation delivery side of pump connects described cooling tower water inlet, and the delivery port of described cooling tower connects the heat exchanger tube water inlet of described heat exchanger;
The described mechanical compression type refrigeration unit of every one-level comprises an evaporimeter, a compressor, a condenser and a choke valve; After cold-producing medium enters the heat exchanger tube heat radiation of described condenser through described compressor, the heat exchanger tube heat absorption that enters described evaporimeter through described choke valve;
The exhaust outlet at the air inlet connection data center of described Air-Water surface cooler housing, the air inlet at the air outlet connection data center of described Air-Water surface cooler housing;
The heat exchanger tube delivery port of described Air-Water surface cooler connects the water inlet of the heat exchanger shell of described cooling tower unit, the delivery port of described heat exchanger shell connects the water inlet of the evaporator shell of the described mechanical compression type refrigeration unit of the first order, the delivery port of the evaporator shell of the described mechanical compression type refrigeration unit of the first order connects the water inlet of the evaporator shell of the described mechanical compression type refrigeration unit of next stage, and the delivery port of the evaporator shell of the described mechanical compression type refrigeration unit of afterbody connects the heat exchanger tube water inlet of described Air-Water surface cooler through described the first circulating pump.
2. a kind of large temperature difference air-conditioning system for data center's heat extraction as claimed in claim 1, it is characterized in that: described Air-Water surface cooler comprises a housing, be provided with some fins that are arranged in parallel in the described housing, described fin vertically is equipped with some row snakelike heat exchange tubes, each is listed as the inlet parallel of described snakelike heat exchange tube on same water inlet collector, and described water inlet collector is as the heat exchanger tube water inlet that passes described Air-Water surface cooler housing; Each outlet that is listed as described snakelike heat exchange tube is connected in parallel on the same water outlet collector, and described water outlet collector is as the heat exchanger tube delivery port that passes described Air-Water surface cooler housing.
3. a kind of large temperature difference air-conditioning system for data center's heat extraction as claimed in claim 2, it is characterized in that: the described snakelike heat exchange tube of every row by from top to bottom, pass some straight tubes of each fin, and the elbow composition that connects two adjacent straight tubes, each described elbow projection on described fin all has an inclination angle with vertical direction.
4. such as claim 1 or 2 or 3 described a kind of large temperature difference air-conditioning systems for data center's heat extraction, it is characterized in that: described cooling tower adopts the cooling tower with the precooling module.
5. such as claim 1 or 2 or 3 described a kind of large temperature difference air-conditioning systems for data center's heat extraction, it is characterized in that: described mechanical refrigeration compression unit is set to more than three grades.
6. a kind of large temperature difference air-conditioning system for data center's heat extraction as claimed in claim 4, it is characterized in that: described mechanical refrigeration compression unit is set to more than three grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220419266.6U CN202734118U (en) | 2012-08-22 | 2012-08-22 | Large temperature difference air conditioning system used for data center heat removal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220419266.6U CN202734118U (en) | 2012-08-22 | 2012-08-22 | Large temperature difference air conditioning system used for data center heat removal |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818326A (en) * | 2012-08-22 | 2012-12-12 | 清华大学 | Large temperature difference air conditioning system for heat extraction of data center and using method thereof |
| CN105444380A (en) * | 2014-07-31 | 2016-03-30 | 北大方正集团有限公司 | Cold water system |
| CN106839218A (en) * | 2017-03-10 | 2017-06-13 | 深圳达实智能股份有限公司 | Central air conditioner system efficiency lifting assembly and its control method |
| CN106949653A (en) * | 2017-04-06 | 2017-07-14 | 北京百度网讯科技有限公司 | Cooling system applied to data center |
| CN108507237A (en) * | 2017-02-27 | 2018-09-07 | 北京丰联奥睿科技有限公司 | A kind of data center's refrigeration system |
| CN108592331A (en) * | 2018-05-10 | 2018-09-28 | 深圳达实智能股份有限公司 | A kind of the cooling tower cooling mode control method and system of air-conditioning system |
-
2012
- 2012-08-22 CN CN201220419266.6U patent/CN202734118U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818326A (en) * | 2012-08-22 | 2012-12-12 | 清华大学 | Large temperature difference air conditioning system for heat extraction of data center and using method thereof |
| CN105444380A (en) * | 2014-07-31 | 2016-03-30 | 北大方正集团有限公司 | Cold water system |
| CN108507237A (en) * | 2017-02-27 | 2018-09-07 | 北京丰联奥睿科技有限公司 | A kind of data center's refrigeration system |
| CN106839218A (en) * | 2017-03-10 | 2017-06-13 | 深圳达实智能股份有限公司 | Central air conditioner system efficiency lifting assembly and its control method |
| CN106839218B (en) * | 2017-03-10 | 2023-07-28 | 深圳达实智能股份有限公司 | Central air conditioning system energy efficiency lifting assembly and control method thereof |
| CN106949653A (en) * | 2017-04-06 | 2017-07-14 | 北京百度网讯科技有限公司 | Cooling system applied to data center |
| CN106949653B (en) * | 2017-04-06 | 2019-12-10 | 北京百度网讯科技有限公司 | Cooling system applied to data center |
| CN108592331A (en) * | 2018-05-10 | 2018-09-28 | 深圳达实智能股份有限公司 | A kind of the cooling tower cooling mode control method and system of air-conditioning system |
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Granted publication date: 20130213 |