[Stoves] cook stoves for Cameroon

[Paul Anderson]

Huck,

Crispin wrote:
> Thus 'gasifiers' are getting rated as if they do not consume fuel that 
> is actually consumed.
Crispin's point is that wood that is turned into charcoal is no longer 
wood.   THAT is true.    But there are two ways to state the 
efficiency:    Fuel efficiency and Energy efficiency. Charcoal that is 
created is no longer wood.   But it is a fuel made from wood that was 
transformed.    And it typically represent 25% to 35% of the energy that 
is in the dry weight of the wood.

You indicated that the area is reasonably wooded.   So it is not a case 
of scarcity of wood.

If the created charcoal is put into the soil as biochar, then that 
energy content is no longer available.

You as the project leader and with your personnel can make the decision 
about how to read the numbers in the reports on stove efficiency (of 
fuel or of energy).

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype: paultlud      Phone: +1-309-452-7072
Website:  www.drtlud.com

On 9/15/2014 10:45 PM, Crispin Pemberton-Pigott wrote:
>
> Dear Huck
>
> Just one quick point:
>
> "The gasifier, as I understand it, is more efficient and has lower 
> emissions."
>
> It depends on the test method and the metrics. It is fashionable to 
> use the GACC-WBT and that test does not report fuel consumption, it 
> reports the fuel mass equivalent of the energy consumption, treating 
> charcoal left over as unburned raw fuel (meaning it says the wood was 
> not consumed).
>
> Thus 'gasifiers' are getting rated as if they do not consume fuel that 
> is actually consumed. When you assess the performance be sure you are 
> clear on how the method calculates performance and what the metrics 
> are. You may want to measure ( and weigh) fuel needed per cooking 
> cycle rather than use any calculated numbers from a complex test protocol.
>
> For evaluation of performance I recommend the CSI-WHT which is a water 
> heating test (no boiling) and a measure of the raw fuel needed per 
> replication of the cooing cycle. It is used by the WB in the Clean 
> Stove Initiative in Indonesia. Documentation (some anyway) is available.
>
> Regards
>
> Crispin in Tamil Naidu
>
>
>
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