Abstract: Anunsteadynumericalmodelforheatdissipationpotentialofmannedspacecraftcylinderradiatorwithtwoparallelloopswasdeveloped.Basedonthismodel,impactofradiatorloopslayoutwithsameandreverseworkingliquidflowingdirectiononradiatorheatdissipationpotentialunderdifferentparameterswasanalyzed,includinglooplength,workingliquidfluxandworkingliquidtemperatureatloopentrance.Accordingtothecalculationresults,onthepremiseofthesameplateareaandlooplength,loopslayoutcouldbringnonignorabledifferenceofheatdissipationpotentialofradiators.Asthelooplengthislonger,workingliquidtemperatureatloopentranceishigher,orworkingliquidfluxisless,heatdissipationpotentialofradiatorwithsameworkingliquidflowingdirectionisbetterthanthatofradiatorwithreverseworkingliquiddirection.Thedifferenceofmaxheatdissipationpotentialcouldbeupto19.5%,andthedifferenceofminimumheatdissipationpotentialcouldbeupto16.7%.

Key words: mannedspacecraft, radiator, thermalcontrolloop, workingliquid, heatdissipationpotential