5.1 Energy and Thermal Properties of Glass
5.1.1 General
The energy and thermal properties of glass is defined by light transmission, internal and external reflection, solar heat gain coefficient and U-value. The performance requirement for glazing shall be suitably selected. Minimum performance requirement is mentioned in the Annex A.
Specific methods of calculating light and energy factors for glass in buildings are covered here and their characteristic data can serve as a basis for light, heating and ventilation calculations of rooms and can permit comparison between different types of glazing. It is applicable to all flat glass material.