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Energy Transfer

The Reflection of Infra-red Radiation from a Surface.

When infra-red radiation falls on an object,
some will be reflected and some will be absorbed.
The greater the proportion of radiation that is reflected,
the less will be absorbed.

An object with a matt or dark surface
will be a poor reflector of infra-red radiation.
An object with a shiny or light surface
will be a good reflector of infra-red radiation.

Shiny metal foil can be placed behind a radiator
in a room to increase its efficiency.
The foil reflects radiation back into the room which
heats the air rather than heating the wall.

Foil Reflecting Heat Radiation

This adds to the efficiency of convection in the room.

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