[Stoves] Use of preheated air for forging with wood.

[Crispin Pemberton-Pigott]

Dear DD

 

> As hot secondary combustion takes place, the stove pipe expands from 6" to
8" diameter five feet up. This expansion causes additional suction. By
allowing additional room at this key point, the expanding gasses do not have
to create back pressure on the draft.

 

That seems really unlikely, unless there are flames burning in the chimney
at that point. If it slows the gas speed and allows additional heat to come
off the larger diameter tube into the greenhouse, it is actually reducing
the total draft.

 

Do you know, even at a guess, at the power level in kW? 

 

Draft is related to the average temperature in the chimney and to a lesser
extent, the diameter. I think if you have a large enough chimney (6" seems
overly large unless the fire is huge) you will 'win' by reducing the average
diameter to keep the hottest gases restrained in a taller, narrower space
with a higher average temperature. That gives more buoyancy which = more
draft, automatically.

 

Have you tried different version of this? Be interesting to hear the
results.

 

Regards

Crispin

 

 

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