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Solar heat gain through windows with roller shades, vertical blinds and Venetian blinds
Sun Radiation through Windows
Heat gain from sun radiation through windows can be controlled with shades or blinds.
Solar Heat Transmission through Windows
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
Solar Heat Transmission through Windows vs. Shading
|Types of Shading||Fraction 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 |
- Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.
- Solar radiation absorbed by various materials.
- Optical properties of commonly used glazing materials.
- Radiation emissivity of common materials like water, ice, snow, grass and more.
- Heat transfer due to emission of electromagnetic waves is known as thermal radiation.
- Daily surface energy from solar radiation.
- Heat from sun transmitted through windows.
- Online solar chart creator.
- The Wet Bulb Globe Temperature can be used to measure the general Heat-Stress index.
- Water condensation on inside glass windows surfaces vs. outside temperature and inside temperature and humidity.
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