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ESTIMATION OF U-VALUE TO EN 673:2011 AND ENERGY
SAVINGS
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FOR VERTICAL
INSULATING GLASS UNIT (IGU) BASED ON EN 673 WINTER CONDITIONS
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Note: Spacer bar is not taken into account
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SELECT GLASS FOR IGU
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Outer Glass Type
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Coating on surface #2 if a Low E glass
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Cavity Width
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mm
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U-Value increases with cavity > 16 mm
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Air or Argon
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Inner Glass Type
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Coating on surface #3 if a Low E glass
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U-VALUE (centre-of-glass)
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Solar control glass such as
Evantage, Sunergy, Stopsol SuperSilver, Performatech and tinted glass must be
installed facing the outside
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Selected IGU
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W/m2.K
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Energy savings compared to:
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4 mm clear glass
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W/m2.K
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4 mm clear glass
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4 mm clear / 12 air / 4 mm
clear IGU
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W/m2.K
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4 mm clear / 12 air / 4 mm clear IGU
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Energy savings are
based on centre-of-glass U Values, and do not account for heat loss through
window frames and energy gain from solar radiation. They do not represent the
total energy savings for a building which are expected to be far less.
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