Friday, May 18, 2007

More quotable

I often hear: “Concrete, brick, and stone are better for storing heat energy.”

They do store energy — but only *specific* energy, which means that as energy is put into the stone, brick, or concrete, the materials get hotter. While wood stores some specific energy, it also stores latent energy, which means the temperature is constant while the wood resins, lignins and cellulose goes through a phase-change. Luckily, that temperature is around 70 degrees F. In a house, you want the temperature to be constant.


No comments: