[Stoves] Role of secondary air on wood burning and charcoal stoves

[Ronal W. Larson]

Sarbagya:

   Can you narrow down the type of stoves you are looking at?  And why?  

   You seem to be talking of TLUDs, and when mentioning consuming char is that in a TLUD?

   We have seen some nice designs with secondary being preheated with a central pipe, not the exterior gap you describe.

   At least one stove developer (Kirk Harris) has argued for using that exterior space for added insulation.  A topic fairly easy to compare in the lab you appear to have available.

Ron

On Aug 20, 2013, at 6:44 AM, Sarbagya R. Tuladhar <sarbagya007 at gmail.com> wrote:

> Hi stovers,
> 
> The debate on the role of secondary air both for natural draft and forced draft has been raging for quite some time now. Obtaining secondary air in pre-heated form has been the research area for me in the laboratory for the past few weeks. However, one conclusion I obtained was that secondary air if not pre-heated would have the tendency to put off the fire by blowing in cold air. 
> 
> Hence my question is:
> 
> What is the role of secondary air for wood burning stoves ? Is there an optimum gap for the secondary air to travel between the jackets of the combustion chamber before ejecting out into the combustion chamber ? How does this effect the performance of the cookstove ? I know a few cookstoves which have secondary air concept included and which seemed to decrease the CO and PM up to some extent. 
> 
> What is the role of secondary air for charcoal burning stoves ? Quoting Crispin "Secondary air is necessary to burn charcoal in a low O2 environment at a high temperature." How does this effect the performance of the charcoal cookstove?
> 
> Waiting for the responses.
> 
> Cheers
> 
> Sarbagya Tuladhar
> Pondicherry, INDIA
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