[TheForge] Heat extracting chimney

Tue Jul 29 00:38:07 2003

Hello Larry;
Yeah, back in '80..sure lost $ on that one....too. The tongue was the 
air intake, there was mica behind the eyes so the fire shown through and 
there was an oven built in on the other side. It is still in service.
An alternative solution, which is pretty interesting, is secondary 
combustion of the smoke.
2 methods; both require a refractory chamber that concentrates and 
stores heat to support the 2nd  stage burning
....1, a catylitic converter ( made for fireplaces)
....2 An air induction ( preferably preheated) valve into the upper chamber.
Both deliver a fair bonus in efficiency and reduce creosote build up.
Pete

Dragons Watch Forge wrote:

> Hi Peter,
>    Are you the builder of the dragon fireplace?  If so that is a 
> wonderful piece of work.
>
>    I figured upon a problem with excess soot an build up, but now I 
> hear rumors of codes on how well these things must vent.  As it is for 
> myself, I was not as concerned due to thoughts of over insulating it 
> to prevent a secondary fire from getting out of hand.  I will first 
> look at getting as much heat out from the fire box with heat sinks and 
> forced air enclosures.  Then see if there is any heat left to be 
> bothered with still in the chimney.  Thanks,
>
> Larry
>
> Peter Fels And Phoebe Palmer wrote:
>
>> Larry: I've made several "sculptural versions". While they worked 
>> well, mo one was fond of the extra hardware..arty or not.
>> The thing about them is they tend to act like condensers unless you 
>> have a well tuned catalytic afterburner in the system.
>> So, build that sucker with the assumption that sooner or later there 
>> will be a secondary fire in there and the whole thing will turn red 
>> hot and sound like a jet engine. A lot of extra walls and vents and 
>> insulation and the like..gets expensive, time consuming and chimney 
>> sweeps will hate you.
>> Oh yeah, if the draw of the fp is at all marginal, you are a smoked 
>> smith..........Pete
>> Dragons Watch Forge wrote:
>>
>>> While living in northern Calif the house we lived in had a roof 
>>> mounted furnace / air conditioner.  The furnace had such an 
>>> efficient heat exchanger that it required an exhaust fan for the 
>>> burner side of the unit.  The fan was plastic.
>>>
>>>    I wish to build a fire place and chimney that has a heat 
>>> exchanger in it that is this efficient.  Any one out there done 
>>> this?  Any sources of reference materials or plans that are available?
>>>
>>> Thanks!
>>>
>>> Larry
>>>
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