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Published byJessica Bow
Modified over 2 years ago
OTTV FOR NON ENGINEERS
OTTV OVERALL THERMAL TRANSFER VALUE
OTTV WATTS PER M 2
OTTV x skin area HEAT W / m 2 =
Q gc glass conduction Q wc wall conduction Q gs glass solar
OTTV x (1-WWR) x U w + x WWR x U f + x x WWR x CF T deq SC SF D T DIFFERENTIAL TEMPERATURE EQUIVALENT TEMPERATURE DIFFERENCE SOLAR FACTOR SOLAR CORRECTION FACTOR SHADING COEFFICIENT
15 (1 −WWR) + 6(WWR) + (194 x x WWR x ) OTTV α Uw UfSC CF BLACK0.9 – 1.0 WHITE0.15 – 0.3 SILVER / ALUMINIUM0.1 SOLAR ABSORPTION FACTOR U VALUE SOLAR CORRECTION FACTOR SHADING COEFFICIENT
α (1 −WWR)Uw + (WWR)Uf + ( x CF x WWR x SC) WALL HEAT WINDOW HEAT SOLAR THROUGH GLASS OTTV
Q gc glass conduction Q wc wall conduction Q gs glass solar 5% 10% - 20% 80%
SHADING COEFFICIENT SC SC = SC 1 x SC 2
U SC α
OTTV IS FOR NON ENGINEERS
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