Annual Base Performance Evaluation on Cell Temperature and Power Generation of c-Si Transparent Spandrel BIPV Module depending on the Backside Insulation Level

Recently,finishingmaterialsatspandrelarea,apartofcurtain-walsystem,aregradualyforcedtoimprovethermal insulationperformanceinordertoenhancethebuildingenergyeficiency.Also,BuildingIntegratedPhotovoltaics(BIPV) systemshavebeeninstaledintheexteriorsideofthespandrelarea,whichisgeneralycomposedofwindows.ThoseBIPVs aimtoachievehighbuildingenergyeficiencyandsupplytheelectricitytobuilding.However,iftransparentBIPVmodule iscombinedwithhighinsulatedspandrel,itwouldreducethePVeficiencyfortwomajorreasons.First,temperaturein theairspace,locatedbetweenwindowlayerandfinishinglayerofthespandrelarea,cansignificantlyincreasebysolar heatgain,becausethespacehasafewairdensityrelativetootherspacesinbuilding.Secondly,PVhasacharacteristics ofdecreasedVoltage(VocandVmp)withtheincreasedtemperatureonthePVcel.Forthesereasons,thisresearch analyzedadirectinterrelationbetweenPVCeltemperatureandelectricitygenerationperformanceunderdiferentinsulation conditionsinthespandrelarea.Thediferentinsulationconditionsunderconsiderationare1)highinsulatedspandrel(HIS) 2)lowinsulatedspandrel(LIS)3)PVstandaloneontheground(SAG).Asaresult,incaseof1)HIS,PVtemperaturewas increasedandthuselectricitygenerationeficiencywasdecreasedmorethanothercases.Tobespecific,eachcases’ maximum temperatureindicatedthat1)HISis88.8°C,2)LISis74.2°C,and3)SAGis66.3°C.Also,eachcasesyield electricitygenerationlikethat1)HISis913.3kWh/kWp,2)LISis942.8kWh/kWp,and3)SAGis981.3kWh/kWp.These resultshowedthatitisneededforustoseektothewayhowthePVCeltemperaturewouldbedecreased.