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7 Cards in this Set

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thermal mass
thermal mass is the ability of a material to absorb heat energy. A lot of heat energy is required to change the temperature of high density materials like concrete, bricks and tiles. They are therefore said to have high thermal mass. Lightweight materials such as timber have low thermal mass.
Thermal mass is not a substitute for ______________
insulation. Thermal mass stores and re-radiates heat. Insulation stops heat flowing into or out of the building. A high thermal mass material is not generally a good thermal insulator.
Thermal mass is particularly beneficial when...
there is a big difference between day and night outdoor temperature.
Correct use of thermal mass can delay heat flow through the building envelope by as much as
10 to 12 hours producing a warmer house at night in winter and a cooler house during the day in summer.
A high mass building needs to gain or lose a large amount of energy to change its internal temperature, whereas a lightweight building requires
only a small energy gain or loss.
Winter - thermal mass goal
Allow thermal mass to absorb heat during the day from direct sunlight or from radiant heaters. It will re-radiate this warmth back into the home throughout the night.
Summer - thermal mass goal
Allow cool night breezes and/or convection currents to pass over the thermal mass, drawing out all the stored energy. During the day protect thermal mass from excess summer sun with shading and insulation if required.