Steve,
For the type of stove that is mentioned, the average efficiency is more
like 35 to 40%. For combination burners, I often say that you need 4 times
the volume in wood as for oil. This thumb rule come quite close to reality.
If you have an efficient 3 stage wood burner, you can get average 60 to 70%
efficiency and only need around 2 times the volume of oil.
Hakan
At 13:10 01/01/2004, you wrote:
Continuing the series, started with Problem #1: How Much Does Heat
Cost?,
Problem # 8 How Much Wood Do I Need? Gives further information for
calculating How much wood is needed to heat a dwelling. Stay tuned
for
Problem #9, which will deal with heat exchangers.
The purpose of this exercise is to learn how to calculate the amount
of wood
we need, given some information about the weather, the wood burning
stove
and the wood that's available. Predicting how much wood we'll need
in any
given situation, such as how much wood to stack for the winter, is
always a
risky endeavor. Any calculations we make are based on best
guesses. It is
prudent to always err on the conservative side. It's better, and a
lot less
costly, to have an extra cord of wood in the spring than to run out
of wood
in the middle of a harsh winter, unless of course, you like to cut
and split
wood in the winter.
http://webconx.green-trust.org/2003/howmuchwood.htmhttp://webconx.green-trust.org/2003/howmuchwood.htm
http://webconx.green-trust.org/2003/heatcost.htm
--
Steve Spence
Renewable energy and sustainable living
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