中文摘要首頁(yè)用紙

大于石膏板。其中VCPCM的濕緩沖值達(dá)到了“優(yōu)秀”級(jí)別。約為11.6%，蘭州建筑的平均節(jié)能約為28.8%。：多孔材料；相對(duì)濕度；濕滯回線；濕緩沖值；相變；節(jié)能大學(xué)英要首頁(yè)用紙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