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Energy Transfer

Heat Insulation and Infra-Radiation in Buildings.

The amount of heat radiation emitted from a building
depends on how hot it is and the type of surface it has.

Shiny surfaces can be used to reflect radiation back into a
building. We have seen how metal foil can be placed behind
a radiator. Lagging for hot water tanks and pipes can
have a shiny surface to increase its insulating properties.

Infra-red radiation is transmitted (passed) through
the air in buildings but not through the windows or walls.

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