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1、ASHRAEThailandChapterAStudyonthePerformanceofCoolingCeilingPanelDr.ChirdpunVitooraporn1andAryutWattanawanichakorn21LectureratBuildingTechnologyandEnvironmentLaboratory,2FormergraduatestudentMechanicalEngineeringDepartment,ChulalongkornUniversity,Phya
2、thaiRd,Patumwan,Bangkok,Thailand,10330Tel:662-2218-6622Fax:662-2252-2889E-mail:chirdpun@chula.com1AbstractInthisresearchtheperformanceofcoolingceilingpanelintransferringheatisstudied.Theparametersconsideredintheexperimentaresuppliedchilledwatertemper
3、ature,suppliedchilledwaterflowrate,andthecoolingperformanceofthepanel.Fromtheexperiment,itisfoundthatsuppliedchilledwatertemperaturehasaneffectonthesurfacetemperatureofthepanel,theroomtemperatureandtheheattransferrateofthepanelatthesteadystateconditi
4、on.Lowsuppliedchilledwatertemperatureincreasestheheattransferrateofthepanel,and,atthesametime,decreasesthesurfacetemperatureofthepanelaswellastheroomtemperature.Inthecontrary,thesuppliedchilledwaterflowratedoesnotsignificantlyaffectthesurfacetemperat
5、ureofthepanel,theroomtemperature,andtheheattransferrateofthepanelatthesteadystatecondition.However,thesuppliedchilledwaterflowratehasaneffectonthetimegradientrequiredforthesurfacetemperatureofthepanel,theroomtemperatureandtheheattransferrateofthepane
6、ltoapproachthesteadystatecondition.Thesurfacetemperatureofthepanel,theroomtemperatureandtheheattransferrateofthepanelapproachthesteadystateconditionfasterasthesuppliedchilledwaterflowrateincreases.Furthermore,heatloadalsoplaysanimportanteffectonthesu
7、rfacetemperatureofthepanelandtheroomtemperatureatthesteadystatecondition.Higherheatloadresultsinhighersurfacetemperatureofthepanelandroomtemperatureatthesteadystatecondition.Resultsfromexperimentareusedtoderivetheequationsthatrepresentthecoolingperfo
8、rmanceofthepanelatthesteadystatecondition.2ASHRAEJournal2004-2005ASHRAEThailandChapter1.Introduction2.1RadiationHeatTransferThecoolingceilingpaneltransfersheattoTheradiationheattransferratefortheorfromaroombyconvectionandradiation.Thecoolingceilingpa
