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re: advice for heating shop
17 aug 2002
arthurs family wrote:
>i am wanting to find out what requirements i will need for heating a 40x30
>shop with infloor heating via a wind / solar combo. the shop will store
>trucks and tractors.
if it's 12' tall with (say) 2,880 ft^2 of 6" (us r24) sip walls and ceiling,
its thermal conductance would be about 2880ft^2/r24 = 120 btu/h-f.
>one or two hot water heaters will be used and no need to keep the
>temperature inside above 10*c.
at 10 c (50 f) indoors and -15 c (5 f) outdoors, it would only need
(50-5)120 = 5400 btu/h or 130k btu/day. this might come from a truck
that idles one hour per day.
a floor with 30x40x1.5 = 1800 btu/h-f of slow-moving airfilm conductance
could supply 5400 btu/h to a 50 f room with a 50+5400/1800 = 53 f surface.
you might cover a metal roof with a single layer of clear corrugated
polycarbonate greenhouse roofing material ("dynaglas" is one brand)
and trickle antifreeze over the metal and collect on the order of 500
btu/ft^2-day of heat at 100 f or lower.
you might store 650k btu for 5 cloudy days in a 650k(100-53) = 13.8k
pound (1728 gallon, or 216 ft^3) water tank.
>i live south west of calgary, alberta, canada.
how about making the south wall with two layers of polyethylene film over
some metal mesh for burglarproofing, and filling the space between the
films with air during the day (with lots of daylight and solar gain) and
tiny cold soap bubbles at night? bill sturm (uniquecl@telusplanet.net)
could help with that.
nick
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