Re: [Stoves] RE (Stoves) Wonderbags

crispinpigott Wed, 13 Nov 2013 13:23:01 -0800

Dear Art

Having worked on these including the ones (a couple of them in RSA) the problem is the materials available are not tolerant of high temperatures - typically they get damaged above 85 C.

A very simple solution is to put a disk of 1/8" or 1/4" masonite into the cooker first. It is cheap, replaceable and will take a real scorching before damage is visible.

The 2-pillow WonderBox from Cape Town promoted by Women for Peace will work with it as well.

In a pinch you can use cardboard and toss it occasionally. In all cases it improves insulation.

Regards

Crispin

From: Art Donnelly

Sent: Wednesday, November 13, 2013 15:07

To: Discussion of biomass cooking stoves

Reply To: Discussion of biomass cooking stoves

Subject: [Stoves] RE (Stoves) Wonderbags

Hi Erin,

Thanks for sharing the information on Wonderbag's. It seem particularly timely in light of the disaster relief needed relief. Retained heat cooking really stretches scare fuel and energy resources. With the added benefit that these are very inexpensive.

I wanted to give Wonderbags a plug and share a note of caution. We had a supporter of the Estufa Finca project donate several Wonderbags she purchased, to us for informal field testing with our cooks in the Talamanca. We also had a really positive exchange of information with the South African NGO creating and marketing them. The bags are very well made. They come with good instructions (in English) and some great recipes. They worked great when used carefully.

However, our experience was that once they went into use in the field and were used in combination with 5+liter pots coming straight off our TLUD-style stoves, the inside bottom liner was scorching very quickly. Then the women got nervous about continuing to use them.

It's a good product that could be improved with a better liner.

Art Donnelly

On Wed, Nov 13, 2013 at 1:00 PM, <stoves-request@lists.bioenergylists.org> wrote:

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Message: 1
Date: Wed, 13 Nov 2013 09:50:27 -0800
From: "Erin Rasmussen" <[email protected]>
To: "'Discussion of biomass cooking stoves'"
<[email protected]>
Subject: [Stoves] Wonderbags
Message-ID: <005401cee098$d6dbc160$84934420$@com>
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Pretty nice looking retained heat cookers.

Wonderbag. Slow cookers:

http://nb-wonderbag.com/

Erin Rasmussen

TR Miles Technical Consultants Inc. http://www.trmiles.com/

and BioEnergy Discussion Lists http://www.bioenergylists.org/

[email protected]

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Art Donnelly
President SeaChar.Org
US Director, The Farm Stove Project
Proyecto Estufa Finca

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Re: [Stoves] RE (Stoves) Wonderbags

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