What is Thermal Mass?

The ability of a material or structure to absorb heat energy is called Thermal Mass.

High density materials such as stone, concrete, bricks, and tiles require a great deal of heat energy to change their temperature and are therefore said to have high thermal mass.

Thermal mass acts as in the same way as a battery, except that is stores heat instead of electricity.

Thermal mass stores and re-radiates heat.

from David Darling’s Encyclopedia of Alternative Energy

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