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3((),200001),,;;;CalculationandapplicationofwetbulbtemperatureRongJianwen(Carrierairconditioning&refrigerationsales(Shanghai)Co.,Ltd.,Shanghai200001)AbstractIt’sdifficulttomeasurewetbulbtemperaturedirectlyandaccurately.Thearticleprovidesasimpleformula.AfterrunningasegmentprogramwecancalculateWBTaccurately.WBTcouldbeappliedtocoolingtowerfancontrolinsummerandtothejudgmentoftheuseoffreecoolingbycoolingtowerinwinteraswell.Keywordssaturatedvaporpressure,enthalpy,wetbulbtemperature,fancontrol.0,,,1Hyland-Wexler[1],,,[2]:Pv=611.2e18.678-Td234.5TdTd+257.14(1):Td,;PvTd,Pa(1)Hyland-Wexler090,0.05%[3]:d=0.62190.01HrPv101326-0.01HrPv(2)h=1.01Td+(2500+1.84Td)d(3)Hr,%,0100;d,kg/kg;h,kJ/kg,,(1)(3)h,,,100%,(1)(3),(4)(6)hwPv=611.2e18.678-Td234.5TwTw+257.14(4)dw=0.6219Pv101326-Pv(5)hw=1.01Tw+(2500+1.84Tw)dw(6)Tw,;Pv,Pa;83200843:(1972-),,,:3333,(),:200001:david.rong@carrier.utc.com,:021-23063389,:13801770496dw,kg/kg;hw,kJ/kg,h(1)(3),,h=hw,(4)(6)(7)Twh=hw=1.01Tw+0.6219(2500+1.84Tw)6112.2e18.678-Tw234.5TwTw+257.14101326-611.2e18.678-Tw234.5TwTw+257.14(7)(7)Tw:,(4)(6)hw,hw(1)(3)hhwh,,hw,h;hwh,,hw,h,h(()),2,,,,,,,,,,,,,,,,,(),,,,,,11[4],29.41934kW,,2261kW,,21:,21,+,,:+,,7,93200842,4,17,,3311,;,;,,312,;[1]HylandW,WexlerA,1983a.FormulationsforthethermodynamicpropertiesofthesaturatedphasesofH2Ofrom173.15Kto473.15K[J].ASHRAETransactions89(2A).[2]CarrierCorporation.ComfortControllerFlowchartManual[M].U.S.A.:CarrierCorporation,1999.[3],,,.[M].:,1994.11.[4]RonBeliveau.Applying19XRVChillersinVariablePrimarySystems[M].U.S.A.:CarrierCorporation,2003.7.(:HON)20081022,,17006100,1614,PVC(),1350,,,2004,,,55,()[]2008112425,(UNEP),2002011HFC134aCO2HFO1234-yf,,UNEP,,0420084