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1、TheFundamentalsofHeatExchangersFeatureFEATUREbyDeanA.Bartletteatexchangersserveastraightforwardpurpose:thermalconductivity,anddynamicviscosity.controllingasystem’sorsubstance’stemperatureDensity()isafluid’smassperunitvolume,mea-3byaddingorremovingthermalenergy.Althoughtheresuredaslbm/ft(wher
2、elbmrepresentspoundsofmass)3aremanydifferentsizes,levelsofsophisti-orkg/m.Densitycanbeusedtoconvertameasure-Tocontrolthetempera-cation,andtypesofheatexchangers,theymentfromamass-flowrate,suchaslbm/hr,tothemorealluseathermallyconductingelement—commonvolumetricunits,suchasgallonsperminutetureo
3、fasystemorsub-usuallyintheformofatubeorplate—toforliquids,orcubicfeetperminuteforgases.Through-separatetwooutaheatexchanger,thestance,pickoneoffluids,suchmass-flowrateremainscon-thatonecanstant,butchangesintem-threetypesofheattransferther-peratureandpressurecanmalenergytochangethevolumetricf
4、lowexchangersandusetheother.rate,particularlyforagas.HomeheatingSoagasflowshouldbestat-theseequationstoesti-systemsuseaedasamassflow,avolu-heatexchang-metricflowatstandardcon-matethesizeyouneedertotransferditions,orasavolumetriccombustion-flowincludingtemperaturegasheattowaterorair,andpressu
5、re.Inanycase,whichiscirculatedtheoperatingpressurethroughthehouse.Powershouldalwaysbespecified.plantsuselocallyavailableSpecificheat(corcpforawaterorambientairingas,whereprepresentsaquitelargeheatexchang-constantpressure)istheerstocondensesteamamountofheatrequiredtofromtheturbines.Manyraiset
6、hetemperatureofoneindustrialapplicationsuseunitoffluidmassbyonesmallheatexchangerstodegree.ItsunitsareestablishormaintainaBTU/(lbm°C)orJ/(kg°C).requiredtemperature.InSpecificheatrelatestheindustry,heatexchangersquantityoftransferredheatperformmanytasks,rang-Figure1.Coilheatexchangersarecapab
7、leoftothetemperaturechangeingfromcoolinglaserstohandlinghighpressuresandwidetemperatureofthefluidwhilepassingestablishingacontrolledthroughtheheatexchanger.differences.sampletemperaturepriorThermalconductivity(k)tochromatography.representstheabilit
