有關(guān)環(huán)境溫度對機(jī)房空調(diào)設(shè)計(jì)的影響

1、專題（2）有關(guān)環(huán)境溫度對機(jī)房空調(diào)設(shè)計(jì)的影響空調(diào)系統(tǒng)作為數(shù)據(jù)中心最重要的子系統(tǒng)，如何合理的設(shè)計(jì)和計(jì)算空調(diào)制冷 量非常重要。除了我們一般核算機(jī)房空調(diào)的制冷量和風(fēng)量外還需要考慮環(huán)境溫度 升高情況下空調(diào)制冷量的修正系數(shù)以及空調(diào)壓縮機(jī)的工作能力。下面以某廠家的 空調(diào)樣本為例詳細(xì)說明計(jì)算過程。Indoor unit specificationProduct ModelNelCol5D00-A012HNetOol5(M)D-AO2SHNetCol5D0O-A035HTotal CDQling capacitvIkW)12_52535Sensible cooing capackWj10-62535Airfli

2、3Wi；m3jb)25DD48006500Electric, hearting capackW)466Him kirfier capacityfkgiTiJ1.52.12.1Net: weightkni15035D350Nitrrdberof fans122Number of compressg111Indoor mrt FLAfAj10-536LD45-DFanAxid FanEC FanAirfcwHorizontal flawPower supplyiV/PhiHzi3 即 415/3/50DimensiDnslW x D k H)(rnm)eao X 55D K ISMeaax 110

3、0K20DDCondensing unit specificationProduct ModelNetCol5D0-AD20MNetCcl500-A0384NetCcl5D0-AD724Power supplylV/Phl-lz)390-4150Number erf212Net weiflhtfkg)5：11D150Air 而州500012DDD26CXX)Liquid pipe；mmj121816Gas pipejmm)162222Outdoor FLAjAJ-2.304_5DDimensions-5V XDX H,ee)05DX1BOX 125013SSX1034X114021 BOX 1

4、D04K110DNotes:1） Dsrta are te&ted under SaQV.Ph/aOhz power supply, Cooling Dapacity conditions:LCo 160OT-A012H. 24return air temiperatiHe, 50% relative humidity. 4512 condeming temperature-以Netcol5000-A035H空調(diào)為例，該空調(diào)制冷量為35KW。該數(shù)據(jù)是在回風(fēng)溫 度24度，50%濕度以及45度冷凝溫度的情況下得到的。但是這里并沒有說明室 外機(jī)環(huán)境溫度多少。通過咨詢廠家得知該數(shù)據(jù)在環(huán)境溫度35度情況

5、下測量的。參考美國UP-TIME對于空調(diào)設(shè)計(jì)要求以及ASHER-2009年版本對于某東南 亞地區(qū)20年內(nèi)最高氣溫的估算，環(huán)境溫度最高38.5度，那么在38.5度情況下 空調(diào)的制冷量是多少？我們需要重新計(jì)算。JAKARTA/SOEKARNO-HA, Indonesiawmo#： 967490Lat 6.12SLong: 106.65E Elev: 8 StdP: 101.23TimeZone: 7.00 (SEA)Period: 88-05 WBAN: 99999Annual Heating and Humidification Design ConditionsColdestMonthHeat

6、ing DBHumidification DP/MCDB and HRColdest month WS/MCDBMCWS/PCWD to 99.6% DB99.6%99%0.4%1%99.6% | 99%DP | HR | MCDBDP | HR | MCDBWS | MCDBWS I MCDBMOWS | PCWD222.022.818.813.627.419.814.527.511.628.79.928.31.1190Annual Cooling, Dehumidification, and Enthalpy Design ConditionsHottest MonthHottestMon

7、thDB RangeCooling DB/MCWBEvaporation WB/MCDBMCWS/PCWD to 0.4% DB0.4%1%2%0.4%1%2%DB | MCWBDB | MCWBDB | MCWBWB | MCDBWB | MCDBWB | MCDBMOWS | PCWD57.633.825.733.125.832.825.927.831.327.531.027.130.85.150Dehumidification DP/MCDB and HREnthalpy/MCDBHours0.4%1%2%0.4%1%2%8 to 4 &DPHRMCDBDPHRMCDBDPHRMCDBE

8、nttiMCDBEnthMCDBEnthMCDB12.8/20.627.022.730.426.221.729.526.121.529.389.231.387.131.585.730.90Extreme Annual Design ConditionsExtreme Annual WSExtremeMax WBExtreme Annual DBn-YearReturn Period Vrfes of ExtremeftMeanStandard deviationn=5 yearsn=10 yearsf n=20 years Ik n=50 years1%| 2.5% |5%Min | MaxM

9、in | MaxMin | MaxMin | MaxH Min | Maxj Min | Max9.78.47.330.017.835.94.51.414.536.911.937.7 9.338.5 7 6.039.5（不同室外溫度及壓縮機(jī)運(yùn)行狀態(tài)下的制冷量）室內(nèi)工況回風(fēng) 37.8/20.8計(jì)算過程室外溫度。c3538.5內(nèi)風(fēng)機(jī)狀態(tài)。c最大轉(zhuǎn)速壓縮機(jī)輸出狀態(tài)額定轉(zhuǎn)速最大轉(zhuǎn)速額定轉(zhuǎn)速最大轉(zhuǎn)速壓縮機(jī)轉(zhuǎn)速rpm4200450042004500吸氣飽和溫度c（蒸發(fā)溫度）11101211根據(jù)額定工況實(shí)測低壓值。并 考慮壓縮機(jī)升轉(zhuǎn)速300rpm 后，吸氣飽和溫度會降低1C。排氣飽和溫度c48495253根

10、據(jù)額定工況實(shí)測高壓值。并 考慮壓縮機(jī)升轉(zhuǎn)速300rpm 后，排氣飽和溫度會上升1C。 且根據(jù)冷凝器散熱量和環(huán)境 溫度的不同，計(jì)算出排氣飽和 溫度計(jì)算制冷量kW38.27639.13737.47838.265采用danfoss計(jì)算軟件計(jì)算實(shí)際制冷量kW36.3637.1835.6036.35根據(jù)實(shí)測數(shù)據(jù)與軟件計(jì)算類 比，偏差5%。凈冷量kW35.1635.9834.4035.15去除風(fēng)機(jī)功率1.2KW的凈制 冷量壓縮機(jī)功率kW9.21810.0859.92610.853采用danfoss計(jì)算軟件計(jì)算冷凝器散熱量kW47.49449.22247.40449.118計(jì)算制冷量+壓縮機(jī)功率室內(nèi)工況：是指室內(nèi)空調(diào)回風(fēng)側(cè)（即熱通道側(cè)）的回風(fēng)溫度（干球溫度）是37.8C，濕球溫度是20.8度。通過上表發(fā)現(xiàn)壓縮機(jī)在額定轉(zhuǎn)速條