Doors and Windows
Doors and windows are all breaks in the otherwise continuous thermal
building envelope. Thus when designing a sustainable, energy efficient
home, a primary consideration in selecting a window system is its
Heat loss through a window is classified according to window efficiency
rating schemes. These schemes provide information on the thermal
performance of different window systems.
There are two components of window and energy efficiency:
- The framing system
- The glazing or panel
Window systems often leak heat out through the frames. Leakage
is often indicated by condensation on the frames. Timber window
systems provide natural insulation, whereas others such as steel
and aluminium will need to incorporate thermal breaks.
When selecting frames with wooden components, ensure the timber
is from a sustainable resource.
Aluminium and steel frames are available with a high recycled content.
There are many thermal glazing options - double glazing, triple
glazing, films, low-e timber framed windows, inert gas interlayers.
More on energy efficient glazing systems.
Thermal Barrier And Light
In some areas, keeping heat out of the building is more important
than keeping heat in. In attempting to shield the interior from
solar energy, the internal lighting is also compromised. Fortunately,
innovative glazing systems - green glass - help to provide a therma
heat barrier whilst allowing the maximum amount of light to enter
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