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re: heat storage "portable heater" ??
3 nov 2000
toby wrote:
>jiva*@humboldt1.com (jiva) wrote:
>>any thoughts on something to set on top of a woodstove then move
>>to heat a small area?...
say an 8' cube with r12 insulation that's 74 f indoors on a 34 f day?
>the ideal unit might weigh something like 10-15
>pounds and "charge up" with 1000 or more btu...
>1000 btu = 1btu/f/lb * 15lb * dt, where dt is how much the water
>increases in temperature... dt = 1000/1/15 = 66f
>basically, warm up water from room temp (say 74f) to 74+66= 140f
>this seems very possible on a woodstove cuz boiling water is 212f.
an 8" cube with 2.7 ft^2 of surface and 4 btu/h-f of cube-to-room air
conductance might keep the 8' cube with 32 btu/h-f room-to-outdoor
conductance at 74 f until the water cools to temperature t, where
t-34
74 f = 34 + -------- 1/32
| 1/4+1/32 [use courier font]
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t -----www-----*-----www----- 34 f
1/4 1/32
so t = 394 f :-)
>may jesus bless,
a little faith-shaking might help.
nick
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