alt.energy.renewable

On Mar 18, 1:40 am, "Bob F" wrote:
> "bill" wrote in message
>
> news:05033e37-c920-43eb-842d-
>
> > Lemme know how that goes, I will be interested to see it.
> > Assuming that you can pull r6 average for the box front and back (R2
> > on the front and r10 on the back), at a 75 degree temperature
> > differential inside to outside,
>
> So you are assuming 0F outside temp? or -5F for most people that I know.

Yes. I am taking 0 degrees F as a design outside temp in upstate NY.

It is also WELL worth noting here that I am taking 30kbtus/hr as a
minimum target number to heat a house. VERY few houses can be heated
with so little heat.

For example, a 1500 SF (small home by most standards, 30 x 50 1 story)
"R-11 insulation in walls and ceilings; no insulation in floors over
crawl spaces; no storm windows; doors and windows fit fairly tight."
house is 75 kbtus/hr to 105kbtus/hr. 2.5 to 3.5 times the minimum
that I am expecting to see a system produce in order to accept a claim
that it can "heat" a house.

http://www.bobvila.com/HowTo_Library/Sizing_Residential_Heating_and_Air_Conditioning_Systems-Air_Conditioning-A1967.html