When direct solar beam falls on a sheet of glass, a part of solar energy is transmitted through glass into the building interior, a part is reflected, and a part is absorbed by the glass. For a clear glass sheet, the percentage of transmitted energy is 85%, reflected energy is 10% and the remaining 5% is absorbed by glass. What is your estimate of the percentage solar heat gain (SHG) of this
glass, defined as the percentage of solar energy that enters the building interior? Explain.
What will be an ideal response?
SHG of glass = 85% + part of the absorbed energy that is radiated into the building interior. The total absorbed
energy in clear glass = 5%. Thus, if both inside and outside air are at the same temperature, SHG = 85% + 2.5% =
87.5%. If the outside air is cooler than the inside air, SHG < 87.5%. If the outside air is warmer than the inside air,
SHG > 87.5%.
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