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1、.RadiationalpanelcoolingsystemwithcontinuousnaturalcrossventilationforhotandhumidregionsAbstractThispaperinvestigatesahybridcoolingsystem,utilizingwind-drivencrossventilationandradiationpanelcoolinginanofficesetting.Thecharacteristicsoftheindoorenvironmentareexaminedusingcomputat
2、ionalfluiddynamics(CFD)simulation,whichiscoupledwitharadiationheattransfersimulation,andHVACcontrolinwhichthePMVvalueforahumanmodelinthecenteroftheroomiscontrolledtoattainthetargetvalue.Thesystemisdevisedwithanenergy-savingstrategy,whichutilizesstratifiedroomairwithaverticaltempe
3、raturegradient.Thecooledairsettlesdownwithinthelowerpartoftheroom,whilethehotandhumidairpassesthroughtheupperregionoftheroom,sweepingouttheheatandcontaminantsgeneratedindoors.Thisstrategyisfoundtobequiteenergy-efficientintheintermediateseasonsofspringandautumninJapan.Evenunderhot
4、andhumidoutdoorconditions,thehybridsystemcoupledwithradiationcoolingwouldbringsignificantenergysavingsarepossiblecomparedwithahybridsystemcoupledwithunderfloorair-conditioning.1.IntroductionWind-drivencrossventilationisconsideredtobeapromisingenergy-effectivestrategy,sinceitutili
5、zesnature’spower.AdjustingtheindoorenvironmentbynaturalcrossventilationwasthetraditionalmethodinhotandhumidregionsofAsiaincludingJapan.However,inmodernbuildings,wherecertainty,reliability,andefficiencyarepreferred,theuseofwind-drivencrossventilationaloneisinadequate.Ahybridaircon
6、ditioningsystemwithcontrollednaturalventilation,oracombinationofnaturalventilationwithmechanicalairconditioningisconsideredtobeabletoovercomethedeficiencyofwind-drivencrossventilation,andhassignificantenergy-reducingeffects.Manystudieshavebeenconductedonnaturalventilationsystemsa
7、ndhybridair-conditioningsystemsinEuropeandJapan。InJapaninparticular,ahybridcoolingsystem,usingunderfloorairconditioningincorporating..naturalventilationisprimarilyused。Butmanystudieshavediscoveredthatradiationcoolingismoreeffectivethanconventionalair-coolingsystemsinmanyareas。Int
8、hisstudy,weadvocateahybridcoolingsystemu
