Factors Determining the Performance of Glass

Factors, which determine the performance of glass are defined as follows:

1. Visible light transmittance (%): The percentage of light transmitted in the visible spectrum, from 380 to 780 nanometers.

2. Visible light reflection (%): The percentage of visible light reflected

3. Ultra Violet Rays (%): Percentage of amount of ultra violet rays transmitted.

4. Solar Energy Transmission (%): Percentage of incident solar energy transmitted by glass.

5. Solar Energy Reflection (%): Percentage of incident solar energy reflected by glass.

6. Solar Energy Absorption (%): Percentage of incident solar energy absorbed

7. Solar Factor (SF): Is the amount of energy entering the building, expressed as a percentage of the incident solar energy. Lower the solar factor, lower the solar energy heat gain.

8. Shading Coefficient (SC): Ratio of solar factor of glass to solar factor of 3mm clear glass (0.87)

9. U Value (W/sqm K): Rate of heat transfer through 1sqm of glass for a temperature differential of 1o K between the interior and exterior. The thermal insulation of glass is assessed by its U-value. Lower the U-value, the lower the heat transfer (loss or gain) through glass.

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