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LessonFive
HeatTransferTopicsWordslearning1Introducitonofheattransfer2Workingsitepictures33Textlerning44heattransferequipment傳熱設(shè)備
heatexchanger熱交換器boiler鍋爐
condenser冷凝器
radiator散熱器
refrigerator冰箱solarcollector太陽(yáng)能集熱器
heattransferrate
傳熱(速)率temperaturedifference溫差
factorofsafety安全系數(shù)experimentalerror實(shí)驗(yàn)誤差
operatingcondition運(yùn)行條件heattransfercoefficient傳熱系數(shù)undertheseadverseconditions在最不利工況下threeformsofheattransfer:conduction傳導(dǎo)
convection對(duì)流
radiation輻射heattransferequipment傳熱設(shè)備heatexchanger熱交換器boiler鍋爐condenser冷凝器radiator散熱器refrigerator冰箱solarcollector太陽(yáng)能集熱器heattransferrate
傳熱(速)率temperaturedifference溫差factorofsafety安全系數(shù)experimentalerror實(shí)驗(yàn)誤差operatingcondition運(yùn)行條件heattransfercoefficient傳熱系數(shù)undertheseadverseconditions在最不利工況下threeformsofheattransfer:conduction傳導(dǎo)
convection對(duì)流
radiation輻射Topicone:FrequentlyusedwordsandphrasesHeatSensibleHeatLatentHeatduetomolecularthermalmotionSolidificationfusionLiquefactionevaporationTopictwo:IntroducitonofheattransferConductionConvectionRadiationThreeformsofheattransferForsteady-stateheatconductioninonedimension,theFourierlawistemperaturegradientcross-sectionalarea
normaltoflowthermalconductivityheatflowrateEquation(1)statesthattheheatflowrate
qinthexdirectionisdirectlyproportionaltothetemperaturegradient
dt/dxandthecross-sectionalareaAnormaltotheheatflow.Theproportionalityfactoristhethermalconductivityλ.Theminussignindicatesthattheheatflowispositiveinthedirectionofdecreasingtemperature.Conductivityvaluesaresometimesgiveninotherunits,butconsistentunitsmustbeusedinEquation(1).(1)Thefundamentalequationforunsteady-stateconductioninsolidsorfluidsinwhichthereisnosubstantialmotioniswherethermaldiffusivity
αistheratioλ/ρcp;λisthermalconductivity;ρ,density;andcp,specificheat.Ifαislarge(highconductivity,lowdensityandspecificheat,orboth),heatwilldiffusefaster.Isthereanymistakes?Heattransferinvolvingmotioninafluidduetothedifferenceindensityandtheactionofgravityiscallednaturalconvectionorfreeconvection.Heattransfercoefficientsassociatedwithgasesfornaturalconvectionaregenerallymuchlowerthanthoseforforcedconvection.Forcedaircoolersandheaters,forcedair-orwater-cooledcondensersandevaporators,areexamplesofequipmentthattransferheatprimarilybyforcedconvection.Whenfluidflowsoveraflatplate,aboundarylayerformsadjacenttotheplate.Thevelocityofthefluidattheplatesurfaceiszeroandincreasestoitsmaximumfreestreamvaluejustpasttheedgeoftheboundarylayer.Radiation,oneofthebasicmechanismsforenergytransferbetweendifferenttemperatureregions,isdistinguishedfromconductionandconvectioninthatitdoesnotdependonanintermediatematerialasacarrierofenergybutratherisimpededbythepresenceofmaterialbetweentheregions.Therateofthermalradiantenergyemittedbyasurfacedependsonitsabsolutetemperature.Asurfaceiscalledblackifitcanabsorballincidentradiation.ThetotalenergyemittedperunittimeperunitareaofblacksurfaceWbtothehemisphericalregionaboveitisgivenbytheStefan-Boltzmannlaw.whereWbisthetotalrateofenergyemissionperunitarea,andσistheStefan-Boltzmannconstant[5.670×10?8W/(m2·K4)].InfiltrationzeroenergybuildinglowenergybuildingTypicalFeatures Increasedceilingandwall insulation Radiantbarrier Lowairinfiltrationrate High-performancewindows EngineeredHVAC Tightductinstallation All-fluorescentlighting Photovoltaic(PV)solar-electric system1.Introduction
heattransferproblemsencounteredinpractice(1)rating(2)sizingtwokindsofapproachforthestudyofheattransfer(1)experimentally(2)analytically2.ModelinginHeatTransfermodelinginheattransferandtheproblemsencounteredaveryaccuratebutcomplexmodelasimplebutnot-so-accuratemodel3.EngineeringSoftwarePackages
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