Improved Windows for Cold Climates
simulations of the heating demand in typical single-family houses in Denmark
and Greenland. The examined windows are typical new windows from Nordic
countries and new proposals of improved windows with low thermal
transmittance and high total solar energy transmittance.
The results show that net energy gain can be increased considerably by reducing
the frame width, which results in a larger transparent area causing a larger solar
gain but still maintaining a low thermal trans-mittance. Using three layers of
glass with large gaps, using very slim frame profiles, and omitting the edge
constructions that normally causes thermal bridges achieve this. Applying
shutters or low emissivity coated roller blinds incorporated in the glazing that
are activated during night time can improve the energy per-formance of
windows.
The results from this work show that it is possible to develop windows with a
positive net energy in a fairly simple way, which means that it contributes to the
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