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OTTVFOR
NON ENGINEERS
OTTVOVERALL THERMALTRANSFER VALUE
architect
OTTVWATTS PER M2
OTTV x skin area
HEAT W / m2 =
architect
externalenvironment
Qgcglass
conduction
Qwcwall
conduction
Qgsglasssolar
OTTV x (1-WWR) x Uw + x WWR x Uf + x x WWR x
CFTdeq SCSFDT
DIFFERENTIAL TEMPERATURE EQUIVALENTTEMPERATURE DIFFERENCESOLAR FACTORSOLAR CORRECTION FACTORSHADING COEFFICIENT
15 (1 −WWR) + 6(WWR) + (194 x x WWR x )
OTTVα Uw Uf SCCF
BLACK 0.9 – 1.0
WHITE 0.15 – 0.3
SILVER / ALUMINIUM 0.1
SOLAR ABSORPTION FACTORU VALUESOLAR CORRECTION FACTORSHADING COEFFICIENT
α (1 −WWR)Uw + (WWR)Uf + ( x CF x WWR x SC)15 6 194
WALL HEATWINDOW HEATSOLAR THROUGH GLASS
OTTV
Qgcglass
conduction
Qwcwall
conduction
Qgsglasssolar
5%
10% - 20%80%
SHADINGCOEFFICIENTSC
SC = SC1 x SC2
USC
α
OTTVISFOR
NON ENGINEERS
THANK YOU