[Stoves] improving charcoal stoves

[Tom Miles]

Dean,

You'll find some lab tests on a Kenya jiko and improved Kenya jiko by
students at UC Berkeley in 2002 on www.bioenergylist.org The tests were done
by students in a class by Dan Kammen and Rob Bailis. 

Tom         

-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org] On Behalf Of Dean Still
Sent: Monday, May 29, 2006 8:48 AM
To: 'Peter Verhaart'
Cc: 'Stoves-List'
Subject: RE: [Stoves] improving charcoal stoves

Dear Peter,

To "cook" 5 liters of water (bring to boil, then simmer for 45 minutes) the
open fire in our tests made 55 grams of CO. The two charcoal stoves made 112
and 135 grams to do the same task. A Rocket made 15. Stoves with forced air
made 7 to 9 grams. Propane made 0.5.

When testing charcoal we see over 1,000 ppm. Dangerous!

Charcoal is like propane in that it requires little tending. Wish we could
reduce the CO. I'm going to test Lanny's stove tomorrow and see what
happens.

All Best,

Dean

-----Original Message-----
From: Peter Verhaart [mailto:pverhaart at iprimus.com.au] 
Sent: Sunday, May 28, 2006 11:25 PM
To: Dean Still
Cc: 'Stoves-List'
Subject: Re: [Stoves] improving charcoal stoves

Dean Still wrote:
> Dear Lanny and the List,
>
> We are trying to improve charcoal stoves but are not having much success.
>
> Here's what I think about charcoal but I'm sure that others will enlighten
> me a lot more since I'm just starting to play with it.
>
> 1.) Charcoal does not burn very hot. A thermometer an inch above the
burning
> charcoal only reads 600C or so. Wood fires are a lot hotter more like
900C?
>   
It depends on the air supply, with sufficient air charcoal burns a lot 
hotter than wood. It used to be used in blast furnaces until the 
landscape was denuded of trees.
What is PM? Particulate matter? If so, how does CO form it when  it 
burns to CO2?
> 2.) Charcoal emits a lot of CO but not much PM. The CO escapes because
there
> are few flames to burn it up. Flame makes PM so maybe for the same reason
> there's low PM?
>
>   
Do we know how much CO escapes from a charcoal stove?

With kind regards,

Peter Verhaart

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