GLASS SELECTION GUIDE - Eboss

HEAT GAIN
(SOLAR CONTROL)
Heat gain from the sun is a key factor in modern housing design.
In winter the Insulating Glass Unit can allow the sun to warm the house and thus reduce the amount
of heating required (kWh) to maintain a comfortable environment.
In summer the Insulating Glass Unit can control the sun’s heat, with the help of special solar control
glasses and thus reduce the amount of cooling required to maintain a comfortable environment.
In all seasons the Insulating Glass Unit can reduce the energy loads on Heating, Ventilating and Air
Conditioning (HVAC) systems. Building shading, blinds and drapes can also be used to reduce heat
gain, but care is required to ensure thermal stress breakage does not occur in the glass.
GOOD
Clear glass
INNER
Low E glass
OUTER
Solution:
GlassTech Low E + IGU
Low E glass such as Climaguard N70
used as the outer pane of the IGU with the
coating on surface 2 is good as it will
reduce the solar heat gain, by lowering
the shading coefficient of the glazing.
BETTER
Clear glass
INNER
Tinted glass
OUTER
Solution:
GlassTech Tinted IGU
Tinted glass used as the outer pane of
the IGU is better as it absorbs solar
energy and will reduce the solar heat gain,
by lowering the shading coefficient of the
glazing. Tinted glasses vary in colour and
performance, with the most common being
grey, bronze and green for housing.
BEST
Low E glass
INNER
Tinted glass
OUTER
Solution:
GlassTech Tinted Low E + IGU
By combining tinted glass and
Low E coatings the best heat gain
performance can be achieved.
In addition reflective glasses can be used
as they are the VERY BEST but they are
not common for housing.
www.metroglasstech.co.nz April 2013