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re: plan for small hydronic shop/greenhouse heater
24 mar 2002
kr wrote:
>my shop has a 10' x 24' greenhouse along the south wall, on a day like
>today the temps are: outside -10c, in shop 11(as low as the gas
>furnace will let it go) and 18 near top of greenhouse. this is still
>10am by midafternoon the top of the gh will be near 30. i now have a
>fan on a thermostat blowing air out of the gh into the shop. the fan
>is about 8' off the floor and the return is at floor level, under the
>workbench.
sounds good, with a one-way plastic film damper to keep the greenhouse
from cooling the shop at night. seems to me you don't have lot of extra
heat from the greenhouse, maybe not enough to collect or store it, if
it only reaches 30 (86 f) by the end of the day.
>i have a 250 gal gas tank which i will put in the shop. for the
>solution in the tank i would like to use a brine of calcium cloride
>like used in tractor tires or a sodium cloride brine...
this may corrode the tank quickly.
>on the north wall of the greenhouse i plan to run a loop of 400' of
>1/2 or 3/4" black poly hose. the hose would run horizontaly back and
>forth 4" apart and 1" off the white painted wall...
>to remove heat from this i plan on pumping the solution through an
>aluminium radiator (ac condenser from an old car) with a fan behind it.
sounds like there won't be a lot of heat to remove. you can only store
about 250gx8btu/g(100f-80f) = 40k btu (12 kwh) of heat this way. is that
enough to be useful?
>you guys think it would be worth doing?
i'd stick with the fan.
nick
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