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.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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