OTTV FOR NON ENGINEERS. OTTV OVERALL THERMAL TRANSFER VALUE.
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Transcript of OTTV FOR NON ENGINEERS. OTTV OVERALL THERMAL TRANSFER VALUE.
![Page 1: OTTV FOR NON ENGINEERS. OTTV OVERALL THERMAL TRANSFER VALUE.](https://reader035.fdocuments.in/reader035/viewer/2022062219/551c38fa550346ea388b484c/html5/thumbnails/1.jpg)
OTTVFOR
NON ENGINEERS
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OTTVOVERALL THERMALTRANSFER VALUE
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architect
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OTTVWATTS PER M2
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OTTV x skin area
HEAT W / m2 =
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architect
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externalenvironment
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Qgcglass
conduction
Qwcwall
conduction
Qgsglasssolar
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OTTV x (1-WWR) x Uw + x WWR x Uf + x x WWR x
CFTdeq SCSFDT
DIFFERENTIAL TEMPERATURE EQUIVALENTTEMPERATURE DIFFERENCESOLAR FACTORSOLAR CORRECTION FACTORSHADING COEFFICIENT
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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
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α (1 −WWR)Uw + (WWR)Uf + ( x CF x WWR x SC)15 6 194
WALL HEATWINDOW HEATSOLAR THROUGH GLASS
OTTV
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Qgcglass
conduction
Qwcwall
conduction
Qgsglasssolar
5%
10% - 20%80%
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SHADINGCOEFFICIENTSC
SC = SC1 x SC2
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USC
α
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OTTVISFOR
NON ENGINEERS
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THANK YOU