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Solar Heat Transmission through Windows

Solar heat gain through windows with roller shades, vertical blinds and Venetian blinds

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Sun Radiation through Windows

Heat gain from sun radiation through windows can be controlled with shades or blinds.

Type of Shading

Transmitted Solar Energy
(%)
Reflected Solar Energy
(%)
Absorbed Solar Energy
(%)
Single or double glass without shading 75 - 80 10 - 20 10 - 20
Vertical Blinds 5 40 - 60 35 - 55
Venetian Blinds 0 23 77
Roller Shades < 25 15 - 80 20 - 65

Effect of Shading compared with unshaded Window

Types of ShadingFraction of Gain through Unshaded Window
Unshaded Window 1.00
Inside roller shade - half-drawn 0.80
Inside roller shade - fully-drawn 0.62
Inside venetian blind 0.65
Canvas awning 0.30
Outside shading screen - solar altitude 20o 0.38
Outside shading screen - solar altitude 30o 0.25
Outside shading screen - solar altitude 40o 0.18
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Tag Search

  • en: radiant sun heat windows venetian roller blinds shades shading heat gain
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