permaculture

[Mark <mpludwig@facstaff.wisc.edu>]

At 10:10 PM 11/21/02 -0800, you wrote:
> Aloha,
>
> > I have always brought combustion air in from the outside in an under
> > floor  pipe to the front of the wood stove or fireplace.  The reason was
> > that  rather than using warmed indoor air for combustion I was using
> > outdoor air,  and thereby saving energy.
>
> I wonder if much (or any) is really saved.  Feeding the stove cold outside
> air means some of the heat energy from the burning wood is lost in warming
> the colder air going into it, one way or another.  Might not burn as hot
> (and thus as efficient) either, if incoming air is *really truly* cold.
> Six of one, half a dozen (or maybe seven) of another.
>
> Anyone have access to heavy-duty physics modeling software and wanna try
> this one out? ;-)
>
>
> John Schinnerer, MA

You make a decent point here.  My notion is that if you can keep from 
drawing air from all over the house your not pulling cold air in windows, 
doors etc. far from the stove, thereby keeping the rest of the house warmer.
M

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Mark P. Ludwig
Poultry Research Lab
University of Wisconsin -Madison
608-262-1730 WK
608-846-7125 HM