Innovative Production of PCMs （Phase Change Materials） Preparation by Vacuum Impregnation： Mechanical Strength of Mortars Cement with Composite PCMs Content.pdf

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Innovative Production of PCMs （Phase Change Materials） Preparation by Vacuum Impregnation： Mechanical Strength of Mortars Cement with Composite PCMs Content.pdf

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J．Chem．Chem．Eng．7(2013)1094-1099 InnovativePrOdUCtionofPCMs(PhaseChangeMaterials) PreparationbyVacuum Impregnation：Mechanical StrengthofMortarsCementwithCompositePCMs Content SirikalayaSuvachittanont，ApinyaDuangchanandThanitMetheenukul DepartmentofChemicalEngineering,FacultyofEngineering,KasetsartUniversity,Bangkok10900,Thailand Received：August19，2013／Accepted：September24，2013／Published：November25，2013 Abstraet：An experimentalinvestigationwasconductedtostudytheefficiencyofthermalinsulationofcompositePCMs(phase changematerials)producedbyvacuum impregnationprocessbetweenpraaffin(PCMs)andflyashparticles．DSC (differential scanningcalorimeter)hasbeenusedtodeterminethethermalpropertiesoflatentheatofmeltingnadheatcapacityforcomposite PCMs．Vacuum impregnationpressureof40in’Hg．paraffinmeltingtemperatureof90。C，vacuum timeandimpregnationtimeof paraffinof30minaretheoptimum conditionofcompositePCM sproductions．Thevaluesof1atentheatofmeltingandheatcapacity are74．00J／g and l5．726J／g．oC forcompositePCMsthatproducesbytheoptimum conditionin vacuum impregnationprocess． IncreasingtheamountofcompositePCMsreplacingofrcementinmortarscausesthecompressivestrength．flexuralstrengthand tensilestrengthreduction．Compressivestrength．flexuralstrengthandtensilestrengthofmortarwithandwithoutcompositePCMs cna beincreasedbythelongertimeofwatercuringformortarspecimens．Therma1conductivityf ofmortarcementisreducedby increasingtheamountofcompositePCM swhichreplacedforcementinmortra platecompositions．CompositePCMshavethe effi ciencyofrthermalenergyinsulationwhenincorporatedintothebuildings．Therefore，thisproperty ofparaffin／flyashcomposites PCM scanreducetheenergyconsumptionofrtemperaturecontrolinthebuildings． Keywords：PCMs，latentheat，heatcapacity，hydrauliccementmortar，mechanicalstrength 1．IntroductiOn importantasdeveloping renewable energy sources． Thermalenergystorages