[Stoves] Rocket stove air supply

[CEDESOL Foundation lists]

Hi Dean,
Dean Still wrote:
> Dear David,
>
> As far as I've heard from hood studies by ITDG they are much less effective
> compared to chimneys in decreasing health risk. 
Thanks for the info on the ITDG report.  I would like to read it,
especially to see what parameters they looked at. 

If you are just comparing ability to exhaust pollutants from a room,
obviously the chimney would be better.  But if you factor in an
efficient user with a decent rocket stove or other efficient stove that
starts by producing less pollutants in the first place and the operator
is used to controlling the burn better, I still believe a hood has
advantages.

In Kobus' case where they were in a no burn zone, a chimney would be
like waving a red flag!

Good to hear from you again
un abrazo
David
> However, maybe your hoods
> are better? I saw some traditional hoods in Morocco built into the kitchen
> that seemed ok although the cook leaning over the fire still breathes in a
> lot of smoke.
>
> Best,
>
> Dean
>
> -----Original Message-----
> From: stoves-bounces at listserv.repp.org
> [mailto:stoves-bounces at listserv.repp.org] On Behalf Of CEDESOL Foundation
> lists
> Sent: Wednesday, November 29, 2006 6:02 AM
> To: ventfory at iafrica.com; Discussion of biomass cooking stoves
> Subject: Re: [Stoves] Rocket stove air supply
>
> Dear Kobus,
>
> In my opinion, hoods placed directly over or stoves placed directly
> under hoods, with incoming ventilation is a better option than a chimney.
>
> With a hood over a fire, the operator can see the burn and adjust if
> smoke occurs.  With most chimney applications I've seen or heard about,
> the operator pays less attention to the burn and if smoke occurs it
> leaves the home often to enter the windows of the neighbors.  My wife
> heard so many tales of this woe when she was in Mexico training solar
> cooking promoters. 
>
> In Bolivia, we recommend using sticks or bamboo as a basic structure in
> a corner, forming a triangle from wall to wall, decreasing in width as
> it increases in height, using mud or stucco to plaster inside and out of
> the structure of the hood and have an opening in the highest part
> directly in the corner if it is possible without harming the corner's
> structural integrity.  Then an open door or open windows or shuttered
> hole low in the opposite wall provides sufficient ventilation.  The top
> hole can have a shutter or plug for when it is not in use, in the case
> of cold climate.
>
> If good improved stoves are used, they should not smoke and the
> ventilation will evacuate the majority of harmful gases and particles,
> without causing excessive outdoor pollution or bothering neighbors.
>
> can discuss more off list if you wish.
>
> warm regards
> David Whitfield
> Venter Forestry wrote:
>   
>
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>
>
>   


-- 
"We make a living by what we get... we make a life by what we give." - unknown author

David Whitfield V.
Executive Director
CEDESOL Foundation

Alternative Education, Renewable Energy, Social Equality 

http://www.cedesol.org

SKYPE - solar1bol