中文摘要首页用纸

大于石膏板。其中VCPCM的湿缓冲值达到了“优秀”级别。约为11.6%，兰州建筑的平均节能约为28.8%。：多孔材料；相对湿度；湿滞回线；湿缓冲值；相变；节能大学英要首页用纸THESIS：Studyofthetheory,preparationandperformanceofcompositephasechangehumiditycontrolmaterialsSPECIALIZATION:ArchitectureTechnologyPOSTGRADUATE:ZhiChenMENTOR:ProfessorMenghaoWiththerapiddevelopmentofsociety,thedemandforenergyisincreasing.Energyconsumptionhasbroughtaboutaseriesofenvironmentalproblems.Inthewholelifecycleofconstructions,theenergyconsumedbythebuildingisabout50%ofthetotalenergyconsumption,andtheenergyconsumptionofHVACsystemcanaccountformorethan50%ofthetotalenergyconsumptionofbuildings.TheloadoftheHVACsystemhaslatentheatloadandsensibleheatload,andthelatentheatloadismainlytocontroltherelativehumidityoftheindoorenvironment.Thisworkattemptstoachievethepurposeofenergyconservationbyusingenergysavingtechnologytoadjusttherelativehumidityintheroom.Thisworkmainlyincludesthreeparts.Thefirstisthetheoreticalysisonthemoistureadsorption/releasephenomenonofporousmaterial,andthemoisturebuffervalueisyzed.Then,thephasechangehumiditycontrolmaterialsareprepared,andthepropertiesofthecompositesaretested.Finally,theperformanceofthematerialsissimulatedbyEnergyPlus.Theadsorptionprocessofphysicaladsorptionandchemicaladsorptionisyzed.Basedonthetheoryofcapillarycondensation,thehysteresisprocessofthephysicaladsorptionisyzed,andtherelationshipbetweenthehysteresisphenomenonandporestructureisyzedrespectively.Aqualitativeexplanationaboutthehysteresisphenomenonofsinglefacestructureandmulticurvedfacestructureisgiven.Theslopeofthehysteresiscurvecausedbyuniformcylindricalstructureiscalculated.Basedontheysisofhysteresisphenomenon,theconceptoffixedpointhumiditycontrolmaterialisputforward,andthecharacteristicsoftheidealfixedpointhumiditycontrolmaterialareyzed.UsingtheAAOtemplate,thetheoryisverified.Atthesametime,basedonthetheoryofBETmultimolecularlayeradsorption,theformulaofthemoistureabsorptionanddesorptionpathinthehysteresisloopisgiven.Themoisturetransferprocessisyzedwhenthemoisturetransfercoefficientandmoisturecapacityarenotconstant.Themoisturebuffervalueisgivenwhenthesurfacemoisturetransfercoefficientistakenaccount.Then,consideringtheexternalrelativehumidityfluctuationisapproximateharmonicvibration,themoistureuptakeisbymoisturebuffervalue,andthecorrectioncoefficientequationisgiventoo.Accordingtosimulations,themoistureuptakeofthegypsumboard,concrete,aeratedconcreteandsprucearecalculated,andtheresultiscomparedtothatcalculatedbymoisturebuffervalue.Theresultsshowthatthecorrectioncoefficientisgoodtocalculatethemoistureuptakewhenthevariationofrelativehumidityisharmonicvibration.Then,silicawaspreparedbytetraethylorthosilicate,andthephasechangematerialwasencapsulatedbyblendingmethod,andthentheencapsulatedphasechangematerialanddiatomiteweremixedtopreparethephasechangehumiditycontrolmaterial.Themicroencapsulatedphasechangematerialswerepreparedbysol-gelmethod,andphasechangehumiditycontrolmaterialwerepreparedbythecombinationofmicrocapsulesanddiatomite.Usingmethyltriethoxysilane,throughsol-gelmethod,microencapsulatedphasechangematerialswereprepared,andphasechangehumiditycontrolmaterialwerepreparedbythecombinationofmicrocapsulesandvesuvianite,zeoliteandsepiolite.Throughthetest,theresultsshowthatthethermalpropertiesofphasechangehumiditycontrolmaterialsareimproved.Thesuper-coolingdegreedecreases,andtheignitionpointincreases.Atthesametime,moistureadsorptionperformanceofeachkindofcompositesisimproved.Themoisturetransfercoefficientislarger,andmoisturebuffervalueislargerthanthatoftheporousmaterials.Themoisturepropertiesarebetterthangypsumboard.ThemoisturebuffervalueofVCPCM(vesuvianitewithmicrocapsules)reaches"goodclass"level.Finally,EnergyPlusisusedtocalculatetheindoortemperature,relativehumidityandenergyconsumptionofbuildingsinNanjingandLanzhouunderdifferentclimaticconditions.Thecalculationresultsshowthat,afterusingthephasechangehumiditycontrolmaterial,thefluctuationofindoorenvironmenttemperatureandrelativehumidityislesstha