[Stoves] Onil and Inkawasi Rocket Elbow Information Request

[Tom Miles]

Shannon's report with pictures is attached to:
http://www.bioenergylists.org/en/ewbprincetonperu

Tom

-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org] On Behalf Of Tom Miles
Sent: Monday, April 02, 2007 8:27 PM
To: 'Discussion of biomass cooking stoves'
Cc: Don O'Neal; rmiranda
Subject: Re: [Stoves] Onil and Inkawasi Rocket Elbow Information Request

Shannon,

We had an update from Winrock on the Inkawasi monitoring project at the
ETHOS meeting in Seattle in January 2007. (Lisa Buttner, Winrock, "IAP
Reduction from the Healthy Stove Project in the Peruvian High Andes:
Preliminary Results").

If you can send me (tmiles at trmiles.com) information on the project I can put
it up on the Biomass Cooking Stoves website for (www.bioenergylists.org) all
on the listserv to view or download it.

Everyone is here on the listserv from the rocket folks (Dean Still, Larry
Winiarski), Onil stove (Don O'Neal) and others so you should get a
productive response. I would imagine that as a result you will both improve
the Inkawasi rockets and try alternatives.

Be sure to download "Design Principles for Wood Burning Cookstoves" from any
of the following sites:
http://www.bioenergylists.org/en/designprinciples
http://www.pciaonline.org/resources.cfm#designprinciples
 
See also:
http://www.bioenergylists.org/en/taxonomy/term/125
http://www.bioenergylists.org/en/taxonomy/term/251%2B12/1
http://www.bioenergylists.org/en/taxonomy/term/178


Regards,

Tom Miles
tmiles at trmiles.com
     

-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org] On Behalf Of Shannon M. Brink
Sent: Monday, April 02, 2007 7:43 PM
To: stoves at listserv.repp.org
Subject: [Stoves] Onil and Inkawasi Rocket Elbow Information Request

I am member of a student chapter of Engineers Without Borders.  We have
built two Inkawasi stoves with somewhat disappointing results.  (We are
still not achieving complete combustion, the sunken pot chambers are
problematic for accommodating a variety of cooking utensils, and the smoke
escapes from the gap around the pot skirts.)  The engineers on the team are
discouraged and have given up on the rocket elbow stove design.  Though I'm
not an engineer, I am skeptical that the stoves were built according to
specifications (one was tiny, the other huge); outside engineers who have
experience with similar stoves have suggested that our combustion chamber
(which was short<only a little more than 12") was too short.

Our design objectives are threefold:
1) Reduce the amount of smoke
2) Reduce the amount of fuel wood necessary
3) Reduce the amount of time needed for cooking

We work in Peru, and the townspeople also use tusa (dried corn cobs) as a
fuel during certain seasons and to ignite the fire.  It produces a thick,
acrid smoke.

Sources outside the University have recommended that we look into other
rocket elbow stoves, such as the Onil stove.  I am interested in the
following data on the Onil stoves:
1) Materials list and costs
2) Results data (smoke reduction, percent complete combustion, fuel
consumption)
3) Plans (if available to the public)
4) Estimation of its effectiveness using the corn cob fuel
5) Any experience you have working with Helps International (I'm planning to
contact them directly as well)

The engineers in our group are currently working on chimneys instead of
stoves as a smoke-reduction technology.  Because this won't address the
combustion and efficiency issues, I am concerned about the viability of
simply installing chimneys over their existing stoves, which are two bricks
with rebar across the top.  Do you know something similar to a chimney has
been effective in other regions?

If you need further information about our project and testing it the
Inkawasi, I'm happy to share it.  I'm not familiar with how listserves work,
so tell me whether I can email that privately or what's the best way to get
it to you.

Thank you in advance, and best wishes.
SMB



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