Re: [papercreters] CMU blocks with crete mortar?

I'm afraid I can't answer that one. I know in principle how it works but don't have the figures handy. The basic idea is that air rises when it warms because it is lighter from expansion. As it rises cold air replaces it, and becomes warmed in turn. As the cavity air warms and circulates, heat is transferred towards cold surfaces, the air is cooled and sinks to replace rising warm air. A quick search shows me many websites that state the principle, but none with hard numbers for the minimum cavity that supports convection of air.

Spaceman

Michele Marcell wrote:

Ok.  How small is that!!
Michele

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