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Published byJessica Bow
Modified over 2 years ago
OTTV FOR NON ENGINEERS
OTTV OVERALL THERMAL TRANSFER VALUE
OTTV WATTS PER M2
HEAT W / m2 = OTTV x skin area
Qgc glass conduction Qgs glass solar Qwc wall conduction
OTTV SOLAR CORRECTION FACTOR SHADING COEFFICIENTTdeq x (1-WWR) x Uw x WWR x Uf x x WWR x DT SF CF SC SHADING COEFFICIENT SOLAR CORRECTION FACTOR TEMPERATURE DIFFERENCE DIFFERENTIAL TEMPERATURE EQUIVALENT SOLAR FACTOR
SOLAR CORRECTION FACTOR SOLAR ABSORPTION FACTOROTTV 15 (1 −WWR) (WWR) (194 x x WWR x ) α Uw Uf CF SC SHADING COEFFICIENT SOLAR CORRECTION FACTOR SOLAR ABSORPTION FACTOR U VALUE BLACK 0.9 – 1.0 WHITE 0.15 – 0.3 SILVER / ALUMINIUM 0.1
α (1 −WWR)Uw + (WWR)Uf + ( x CF x WWR x SC)OTTV 15 α (1 −WWR)Uw + (WWR)Uf + ( x CF x WWR x SC) 6 194 WALL HEAT SOLAR THROUGH GLASS WINDOW HEAT
Qgc Qgs 10% - 20% 80% Qwc 5% glass conduction glass solarwall conduction 5%
SC SHADING COEFFICIENT SC = SC1 x SC2
α SC U
OTTV IS FOR NON ENGINEERS
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