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OTTV FOR NON ENGINEERS. OTTV OVERALL THERMAL TRANSFER VALUE.

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Presentation on theme: "OTTV FOR NON ENGINEERS. OTTV OVERALL THERMAL TRANSFER VALUE."— Presentation transcript:

1 OTTV FOR NON ENGINEERS

2

3 OTTV OVERALL THERMAL TRANSFER VALUE

4 architect

5 OTTV WATTS PER M 2

6 OTTV x skin area HEAT W / m 2 =

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8 architect

9

10 external environment

11 Q gc glass conduction Q wc wall conduction Q gs glass solar

12 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

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14 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

15 α (1 −WWR)Uw + (WWR)Uf + ( x CF x WWR x SC) WALL HEAT WINDOW HEAT SOLAR THROUGH GLASS OTTV

16 Q gc glass conduction Q wc wall conduction Q gs glass solar 5% 10% - 20% 80%

17 SHADING COEFFICIENT SC SC = SC 1 x SC 2

18 U SC α

19 OTTV IS FOR NON ENGINEERS

20 THANK YOU


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