[Stoves] (stoves) Haitian cooking

[Tom Miles]

Andrew,

I have heard the 1 m3 solid wood/person per year number used in Southern
Africa.  

The easiest way to compare wood and charcoal in the specific fuel
consumption is probably field measurement in grams of charcoal per meal
(400g?) and grams of wood per meal (1500?) and converting them to a kg per
person day. 

There seem to be some wide differences between field tests (in Africa, for
example) and laboratory tests (in the US), up to 2:1. There is probably a
g/meal comparison for wood and tlud stoves. Is there a comparative number
for grams of charcoal/meal?   

Tom
-----Original Message-----
From: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
ajheggie at gmail.com
Sent: Wednesday, June 29, 2011 1:14 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] (stoves) Haitian cooking

On Wednesday 29 June 2011 17:09:05 Tom Miles wrote:
> At 1.5 kg/person per day x 365 days = 548 kg/year or about 1 m3 of
> solid wood per year. If the wood was converted to charcoal at 10-30%
> yield it would require 10-3 m3 of solid wood per person per year.

Only true if yield is 10-30% of volume.

In a kiln the char yield will be very dependant on initial moisture 
content. So, for instance, your solid cubic meter of wood weighing 548kg 
in a temperate hardwood such as English Oak would have an impossibly low 
moisture content of 3% and would comfortably yield 137kg of char in a 
tlud.

The whole wood calorific value would be about 10,000MJ and the char would 
have about 4000MJ.

So what are the comparative cooking efficiencies for the char compared 
with whole wood?

AJH


_______________________________________________
Stoves mailing list

to Send a Message to the list, use the email address
stoves at lists.bioenergylists.org

to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists
.org

for more Biomass Cooking Stoves,  News and Information see our web site:
http://www.bioenergylists.org/