[Stoves] solar cookers

Tue Jul 19 16:21:06 CDT 2016

Dear Ron, List

It is now 25 years since a friend of mine wrote “the road from Pretoria to Nairobi is littered with discarded solar cookers.”

Yes, they work – as long as the sun is shining. It takes one cloudy day, and an evening with hungry, screaming kids, to convince you that it is a supplement at best, not a solution. Then you lose a meal to a passer-by, or some voracious monkeys, and you begin to doubt its efficacy even as a supplement. 

I have heard noises of success elsewhere in the world. Equally, I came across a sociologist’s contribution (now lost) which said in effect that cooking was something with which you had to be personally involved, to stir, to taste, to season, to judge when it was cooked.  Leaving the cooking alone for a few hours was psychologically unsettling.

Keep stoving!

Philip Lloyd  

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Ronal W. Larson
Sent: Tuesday, July 19, 2016 8:35 PM
To: Deniz.Ispaylar at onedollarglasses.org
Cc: Patricia Roberts; Discussion of biomass
Subject: Re: [Stoves] NGO is looking for a stove update in production process

Deniz,  cc List and Patty

            1.  Yours is a most wonderful organization.  Congratulations to the many of you in 8 countries - clearly providing a very valuable new service.

            2.  I have read two responses on bio- stoves that will work.  I normally would agree that a TLUD (charcoal-making) stove would be a best alternative.  But please try to avoid using charcoal in most locations - where its remote, crude production is even (appropriately) apt to be illegal.

            But all biomass stoves routinely operate at temperatures an order of magnitude larger than you desire.

            3.  I suggest instead thinking of solar cookers.  See SCI at http://www.solarcookers.org/index.php.  

                        A good friend and neighbor (cc'd) has been on the SCI board and she and her (excellent Engineer) husband would be pleased to communicate on best (least cost) solar cooker designs.  Reaching 120 C is trivial.  Solar sizes could be provided from heat-shrinking one at a time up to thousands. 

            4.  It was not clear from your website whether you desired to have this heat shrinking occur at central factory locations or at the point of sale.  Or differently stated, why did you mention 10 minutes?   It could be that electrical heating is even a good choice - assuming the kWh for one pair is as low/cheap as I guess - using remote PV.   This, with modest battery storage, could even allow final heat-shrinking at night - and probably an application for 1 minute - not ten.

            5.  I (and many on this list) have continuing possible non-stove contacts in a number of countries beyond your present eight.  Solar cookers are now being used everywhere.   How are you selecting countries into which you will expand?

Ron

On Jul 19, 2016, at 7:37 AM, Deniz Ispaylar [OneDollarGlasses] <Deniz.Ispaylar at onedollarglasses.org> wrote:

Dear cooking stoves experts,

I am working for the non-profit NGO OneDollarGlasses <http://www.eindollarbrille.de/> . We have the mission to set up a social business in development countries worldwide to provide high-quality and affordable glasses to people in need. The glasses are produced by locals in these countries. To ensure that the manufacturing is possible and reliable at any time we have developed a currentless production process. 

One part of this process is to heat shrinking tubes with a stove (attachment 1 and attachment 2). For us it seems like that the current stove which we are using is outdated, not healthy neither for the manufacturer nor for the nature and inefficient. So we are looking for some new technologies of stoves which we can implement in our production process. This is the reason why I am addressing this email to you to get expert-input.

The shrinking tube (attachment 3) is made out of irradiation crosslinked Polyolefin and has a shrinking temperature of +120°C. Attachment 4 gives some more information on the shrinking tubes (unfortunately this is only available in German, but easy to translate). 

The requirements of the new stove are 

*	that we do have a temperature of roundabout +120°C somewhere near the stove
*	that the temperature should be reached really fast
*	that the combustion last for at least 10 minutes
*	that we can use charcoal
*	that the combustion is high efficient and has a low-emission

Maybe there is a stove out there, that suits our needs. :-)

I would be more than happy to get some feedback and/or input and can`t wait to start into a discussion on how we can improve our production process. 

Warmest regards

Deniz

______________

Deniz Ispaylar
Country Coordinator Malawi

EinDollarBrille e.V.
Böhmlach 22, Germany
91058 Erlangen

T +49 178 499 9738

Skype: kla4dj

 <mailto:martin.aufmuth at onedollarglasses.org> deniz.ispaylar at onedollarglasses.org

Web and social media:
 <http://www.eindollarbrille.de/> www.eindollarbrille.de 
 <http://www.onedollarglasses.org/> www.onedollarglasses.org 

G L A S S E S   F O R   150   M I L L I O N

Vertretungsberechtigter Vorstand: Martin Aufmuth, Alex Armbruster, Brigitte Weis;

Vereinsregister: Fürth / VR 200672; UID-Nr.: DE286412852

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