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Re: Trombe wall efficiency



Woodrow W. Baker <knapper@bga.com> wrote:
>Nick Pine (nick@vu-vlsi.ee.vill.edu) wrote:
>
>: The idea here is that the cool air rises up through the passage between
>: the glazing and the shadecloth, moves ***through*** the shadecloth,
>
>expanded lath (expanded metal used on stucco and some rockwork usually 
>embedded in the cement) painted black is what I have been told works best.

Steve Baer mentions that 4 or 5 layers of metal lath work nicely for
natural convection, in _Sunspots_. I think the Jersey Devil used something
like that in an early solar house. "Air hair" (fiberglass insulation,
painted black, with transverse flow?) or black fabric air filter material
should work too. But shadecloth is very cheap and durable, and in a
linear model, the heat that comes into the glazing has nowhere else to
go but out the R1 glazing or into the airflow...

Nick


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