Title: Thermal break - Wikipedia
Headings: Thermal break
Thermal break
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Content: metal windows and doors (aluminium, steel etc.) - separating the frame into two separate interior and exterior pieces joined with a less conductive material reduces temperature transfer. Thermal breaks (made of substantially rigid, low thermal conductive polyamide or polyurethane which is mechanically locked in aluminum window framing can be more than a thousand times less conductive than aluminum and a hundred times less than steel. In addition thermal breaks can have the added benefit of reducing sound transmittance by dampening vibration. The concept of a thermal break is similar to that of a double or triple glazed unit: creating a thermal barrier against heat loss by introducing a low conductive material to the system makeup. With outstanding thermal breaks, aluminium frames are able to be used for passive houses. The geometry and material of thermal breaks are aimed to decrease heat loss because of conduction, convection and radiation. Conduction is decreased by using materials with minimum lambda values and also using profiles with hollow chambers. Convection is decreased by using flags on insulation profiles.