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Understanding the value of U-value

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Glass is one of the most versatile and oldest building materials known to man. From humble beginnings as a window pane in the luxurious houses of Pompeii to sophisticated structural members in modern buildings today, its role in architecture has evolved significantly over the years.

Glass insulates us from extreme weather conditions as well as controls the passage of light and heat into and out of a building. Therefore, selecting the right glass for windows is a critical element of a building’s design plan. It not only determines the energy-efficiency of the windows, but also energy costs, heat gain / loss into and out of the building, occupants’ comfort levels, and much more.


In summers, Low-E glass reduces
the heat gain from the sun to
keep the building’s interiors cool.


In winters, Low-E glass allows warm,
solar rays to enter the building
 while
blocking the heat inside from escaping.

While there are several factors that need to be considered when choosing glass for windows, a key factor is the ability of the glass to control heat gain or loss (depending on the type of climate).U-value, a measure of thermal transmittance, is the rate of heat transferred (heat lost or gained) through glass (fenestration/ glazing specifically) by the combined effects of conduction, convection, and radiation when there is a temperature difference between the interior and exterior of a building.It is expressed in Watts per square metre Kelvin (W/m2K) or Watts per square metre degree Celsius (W/m2°C) in SI units and Btu/hr/ft2°F in imperial units.

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