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1、SHTxxHumidity&TemperatureSensmitterApplicationNoteConditionsofThermalComfort1IntroductionThermalcomfortisdefinedasthatconditionofmindwhichexpressessatisfactionwiththethermalenvironment.Alotofempiricaldatahasbeencollectedonhowtheseconditionsaredefined.Thisapplicationnotegivesashortintroductionontherm
2、alcomfortespeciallyinrespectofhumidityandtemperature.Thefactorsthathaverelevantinfluenceonthethermalcomfortofoccupant’sspacescanbegroupedinenvironmentalandpersonalfactors.Environmentalfactors:-temperature,thermalradiation,humidity,airspeedAirvelocityisnotinthescopeofthisdocument.Generally,itcanbesai
3、d,thatairdraughtshouldbeavoidedaltogetherforsedentarypersons,sinceitisanunwantedlocalcoolingofthebodycausingdiscomfort.Personalfactors:-activity,clothingAcceptanceofthethermalenvironmentandtheperceptionofcomfortandtemperaturearerelatedtometabolicheatproduction,itstransfertotheenvironment,andtheresul
4、tingphysiologicaladjustmentsandbodytemperatures.Activityismeasuredastherateofenergyproductionofthebody.Metabolism,whichvarieswithactivity,isusuallyexpressedinmetunits.Onemetisdefinedas58.2W/m2,whichisequaltotheenergyproducedperunitsurfaceareaofaseatedpersonatrest.Thesurfaceareaofapersonisabout1.8m2.
5、Conditionsforcomfortgiveninthisdocumentrefertoapersonwhoisdoinglightsedentaryactivity(≤1.2met).Clothing,throughitsinsulativeproperties,isanimportantmodifierofbodyheatlossandcomfort.Clothingischangingtoagreatextentbytheseasonandoutdoorweatherconditions.Duringthesummermonths,typicalclothingincommercia
6、lestablishmentsconsistsoflight-weightdresses,lightweighttrousers,short-orlong-sleevedshirtsandblouses,andoccasionallyasuitjacketorsweater.Duringwinterseason,peopleweargarmentsconstructedofthicker,heavier(warmer)fabricsandoftenaddmoregarmentlayerstoanensemble.Conditionsforcomfortgiveninthisdocumentre
7、fertopersonsinsuchtypicalsummerandwinterclothings.Becauseofindividualdifferences,itisimpossibletospecifyathermalenvironmentthatwillsatisfyeveryone.Conditionsstatedinthisdocumentwillensurethat80%ormore
