[Greenbuilding] firewood moisture content
nick at early.com
Mon Dec 19 06:32:21 PST 2011
>Here's a condensing pellet stove:
I wonder what they cost. Will they be selling them in the US?
How about a condensing chimney, eg a conventional chimney heat exchanger
http://www.amazon.com/Magic-Heat-Reclaimer-Wood-Stove/dp/B0000AXEXB with a
fan that pushes room air through some small horizontal tubes in a 6 inch
chimney pipe into 10 feet of 8 inch pipe surrounding 10 feet of 6 inch
chimney pipe to make a condensing counterflow air-air heat exchanger? Some
of the pressurized room air could enter the outdoor air inlet pipe of a
conventional airtight woodstove for a bit of forced draft, with a room
temperature thermostat to turn on the fan.
With A = 10Pi6"/12" = 16 ft^2 and Cmin = 10 Btu/h-F (10 cfm) and U = 2
Btu/h-F-ft^2, NTU = AU/Cmin = Pi. Cmax = 200 cfm makes Z = Cmin/Cmax = 0.05
and E = (1-e^(-NTU(1-Z))/(1-Ze^(-NTU(1-Z)) = 0.95. Thi = 200 F and Tci = 70
F makes Tho = 200 - 0.95(200-70) = 76 F.
Frank Tettemer <frank at livingsol.com>
>The other advantages of very dry wood are that the house receives more
>BTU's per cord of wood. This results in less wood to bring in, and fewer
>ashes to take out.
Water vapor makes ashes? :-)
More information about the Greenbuilding