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re: questions about concrete floor as heatsink in garage/workshop
23 aug 2001
danny labert wrote:
>i'm planning to build a garage-workshop about 25w x 20d x 13h using icf.
insulated concrete foundation?
>i would like to at least supplement the heating with solar.
>i'm in toronto canada.
>...is it practical to use the floor as a heat sink?
i'd say not, because it is horizontal, like most of the winter sun, and
it is uninsulated above, so you have to "live in the heat battery," ie you
can't make the slab much warmer than 80 f without overheating yourself,
so it can't store lots of heat for a cloudy week, vs a 120 f heat store,
and you need to suffer "cloudy day droop," vs a constant 70 f room temp
during a cloudy week, and concrete costs more than water, and it only
stores 25 btu/f-ft^3 vs 64...
how about covering the south wall with two layers of plastic film
filled with air during the day and tiny cold soap bubbles at night,
with a waterwall (water-filled plastic film drum liners on shelves)
behind it and some insulation behind that?
nick
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