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re: heatload calcs
21 sep 2004
sam wrote:
>a 10x10 room in a moderate winter zone needs 22btu/sqft or 2200btu which is
>about 650w. with a 900w heater, what is the maximum temp i could maintain
>with an outside temp of -5c/23f? moderate winter zone is defined as a
>minimum 0c/32f.
if it needs 2200 btu per hour at 70 f inside and 0 f outside, its thermal
conductance is 2200btu/h/(70f-0f) = 31.4 btu/h-f. a 900 w (3071 btu/h)
heater would make 3071 = (t-23)31.4, so t = 23+97.8 = 120.8 f :-)
>there is a 5' vinyl double glazed patio door (unknown r value). the room is
>facing west with another exposed wall facing south...
you might enjoy painting the south wall dark and covering it with
a single layer of polycarbonate glazing with an air space to make
a thermosyphoning air heater.
nick
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