[Stoves] Lowering emissions

[Tom Miles]

Crispin,

Properties of Species used for cookstoves

It would be useful to identify the species that are used in stoves. We can
start with the douglas fir softwood that has been used by Aprovecho and in
the residential testing. Red oak is the hardwood that is the main reference
fuel for heating stoves in the US. Canmet's emissions testing used douglas
fir and red oak. We can comparese the properties of these hardwoods and
softwood to the many species used in other parts of the world using
available information for density, typical moisture, ash and heating value,
chemical composition and burning behavior. The hardwood vs softwood
classification covers the main physical differences. 

I have seen some good area surveys in West africa that identify principal
species used for fuel and charcoal. I have not seen similar information for
Central america, Asia or other locations. 

Tom      



-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org] On Behalf Of Crispin
Pemberton-Pigott
I am intrigued enough to say I will check to see of the 'burn in rate' at
the ends is different from the burn in rate at the sides.  I will bet
softwoods have more variation that hardwoods, and that lowveld acacias with
salts in the wood (which makes them self-extinguishing and therefore glowing
coals type fires) has nearly no difference.

Thanks
Crispin

----- Original Message -----
From: "Tami Bond" <yark at uiuc.edu>
To: "Crispin Pemberton-Pigott" <crispin at newdawn.sz>; "Discussion of biomass
cooking stoves" <stoves at listserv.repp.org>
Sent: Wednesday, January 03, 2007 8:19 AM
Subject: Re: [Stoves] Lowering emissions


Crispin,

I'd also suggest that the smallest cross-grain dimension and along-grain
dimensions would be more important than surface area to volume. This might
dictate the rate at which heat transfers in, and volatile matter transfers
out.

cheers
Tami


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