There are various types of glass manufacturers use in constructing
Clear glass has been
the primary material available for window panes in homes. However,
in recent years, the market for glazing--or cutting and fitting
window panes into frames--has changed significantly. Now several
types of special glazing's are available that can help control heat
loss and condensation.
Low_emissivity (low-e) glass.
This has a special surface coating to reduce heat transfer back
through the window. These coatings reflect from 40% to 70% of the
heat that is normally transmitted through clear glass, while allowing
the full amount of light to pass through.
This contains special tints that allow it to absorb as much as 45%
of the incoming solar energy, reducing heat gain. Some of the absorbed
heat, however, passes through the window by conduction and re-radiation.
This has been coated with a reflective film and is useful in controlling
solar heat gain during the summer. It also reduces the passage of
light all year long, and, like heat-absorbing glass, it reduces