Liquids - Latent Heat of Evaporation - The Engineering ToolBox

The input energy required to change the state from liquid to vapor at constant temperature is called the latent heat of vaporization. When a liquid vaporize ... EngineeringToolBox-Resources,ToolsandBasicInformationforEngineeringandDesignofTechnicalApplications! Liquids-LatentHeatofEvaporationLatentheatofvaporizationforfluidslikealcohol,ether,nitrogen,waterandmore.SponsoredLinksTheinputenergyrequiredtochangethestatefromliquidtovaporatconstanttemperatureiscalledthelatentheatofvaporization.Whenaliquidvaporizeatthenormalboilingpointthetemperatureoftheliquidwillnotrisebeyondthetemperatureoftheboilingpoint.Thelatentheatofvaporizationistheamountof"heatrequiredtoconvertaunitmassofaliquidintovaporwithoutachangeintemperature".ProductLatentHeatofEvaporation*)-he-(kJ/kg)(Btu/lb)Aceticacid402173Acetone518223Alcohol896385Alcohol,ethyl(ethanol)846364Alcohol,methyl(methanolalcohol,woodalcohol,woodnaphthaorwoodspirits)1100473Alcohol,propyl779335Ammonia1369589Aniline450193Benzene390168Bromine19383Carbonbisulphide160Carbondioxide574247Carbondisulphide351151Carbontetrachloride19483Chlorine293Chloroform247106Decane263113Dodecane256110Ether377162Ethyleneglycol800344Trichlorofluoromethane refrigerantR-1118077Dichlorodifluoromethane refrigerantR-1216571Chlorodifluoromethane refrigerantR-22232100Glycerine974419Helium219Heptane318137Hexane365157Hydrogen461198Iodine16471Kerosene251108Mercury295127Methylchloride406Nitrogen19986Octane298128Oxygen21492Propane428184Propylene342147Propyleneglycol914393Sulphur1510650Sulfurdioxide164Toluene351151Turpentine293126Water2256970.41kJ/kg=0.43Btu/lbm=0.24kcal/kg*)Thelatentheatsofevaporationarebasedonfluidboilingpointtemperaturesatatmosphericpressure.EvaporationHeatTheheatrequiredtoevaporateafluidcanbecalculatedas:q=hem                                                            (1)whereq=evaporationheat(kJ,Btu)he=evaporationheat(kJ/kg,Btu/lb)m=massofliquid(kg,lb)Example-Calculateheatrequiredtoevaporate10kgofwaterThelatentheatofevaporationforwateris2256kJ/kgatatmosphericpressureand100oC.Theheatrequiredtoevaporate10kgcanbecalculatedasq=(2256kJ/kg)(10kg)  =22560kJSponsoredLinksRelatedTopicsMaterialProperties-Materialpropertiesofgases,fluidsandsolids-densities,specificheats,viscositiesandmore.RelatedDocumentsAcetone-DensityandSpecificWeight-Onlinecalculator,figuresandtablesshowingdensityandspecificweightofacetoneattemperaturesrangingfrom-95to275°C(-138to530°F)atatmosphericandhigherpressure-ImperialandSIUnits.Acetone-ThermophysicalProperties-Chemical,physicalandthermalpropertiesofacetone,alsocalled2-propanone,dimethylketoneandpyroaceticacid.Phasediagramincluded.Benzene-DynamicandKinematicViscosityvs.TemperatureandPressure-Onlinecalculator,figuresandtableshowingdynamicandkinematicviscosityofbenzene,C6H6,atvaryingtemperatureandpressure-ImperialandSIUnits.Benzene-Thermophysicalproperties-Chemical,physicalandthermalpropertiesofbenzene,alsocalledbenzol.Phasediagramincluded.Ethanol-DynamicandKinematicViscosityvs.TemperatureandPressure-Onlinecalculator,figuresandtablesshowingdynamicandkinematicviscosityofethanol,C2H5OH,atvaryingtemperatureandpressure-ImperialandSIUnits.Ethanol-SpecificHeatvs.TemperatureandPressure-Onlinecalculators,figuresandtablesshowingspecificheat,CpandCv,ofgasousandliquidethanolattemperaturesrangingfrom-25to325°C(-10to620°F)atatmosphericandhigherpressure-ImperialandSIUnits.Ethylene-ThermophysicalProperties-Chemical,physicalandthermalpropertiesofethylene,alsocalledethene,aceteneandolefiantgas.Phasediagramincluded.EvaporationfromaWaterSurface-Evaporationofwaterfromawatersurface-likeaswimmingpooloranopentank-dependsonwatertemperature,airtemperature,airhumidityandairvelocityabovethewatersurface-onlinecalculator.EvaporativeCooling-Evaporativecoolingtutorial.HeavyWater-ThermophysicalProperties-Thermodynamicpropertiesofheavywater(D2O)likedensity,meltingtemperature,boilingtemperature,latentheatoffusion,latentheatofevaporation,criticaltemperatureandmore.Hydrogen-DensityandSpecificWeightvs.TemperatureandPressure-Onlinecalculator,figuresandtablesshowingdensityandspecificweightofhydrogen,H2,attemperaturesrangingfrom-260to325°C(-435to620°F)atatmosphericandhigherpressure-ImperialandSIUnits.LatentHeatFlow-Latentheatistheheatwhensuppliedtoorremovedfromairresultsinachangeinmoisturecontent-thetemperatureoftheairisnotchanged.LiquidsandGases-BoilingPoints-Boilingtemperaturesforcommonliquidsandgases-acetone,butane,propaneandmore.MeltingandBoilingTemperatures-EvaporationandMeltingHeatscommonMaterials-Meltingandboilingpointtemperatures,latentheatofevaporation,andmeltingheatofcommonsubstanceslikecopper,gold,leadandmore-SIunits.Methanol-DynamicandKinematicViscosityvs.TemperatureandPressure-Onlinecalculator,figuresandtablesshowingdynamicandkinematicviscosityofliquidmethanol,CH3OH,atvaryingtemperature-ImperialandSIUnits.Methanol-ThermophysicalPropertiesvs.Temperature-Thermophysicalpropertiesofmethanol.Nitrogen-DensityandSpecificWeightvs.TemperatureandPressure-Onlinecalculator,figuresandtablesshowingdensityandspecificweightofnitrogen,N2,attemperaturesrangingfrom-175to1325°C(-280to2400°F)atatmosphericandhigherpressure-ImperialandSIUnits.Nitrogen-ThermophysicalProperties-Chemical,PhysicalandThermalPropertiesofNitrogen-N2.SteamandVaporEnthalpy-Vaporandsteamenthalpy,specificent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