[Stoves] solar cooker response (changing thread name)

Wed Jun 14 12:57:31 CDT 2017

Go to the 7:30min and see the heat being thrown onto the pot. 
https://www.youtube.com/watch?v=c0XWyASyyko

These Western China developed solar cookers worked really well in the Gansu province villages we worked in.  As far as I could see they had no major issues and were well appreciated. The main function of the stove was water boiling for water purification, boiling potatoes and pre-heating water for cooking noodles. Cooking was done by villagers on a biomass or biogas stove.  

The solar stoves were cast concrete with small mirrors glued onto them. The stoves had no theft or breakage issues and costs reasonable and were always in use. GTZ could have saved a lot of money doing a side trip to China to see how the Chinese have worked to build a viable solar stove. I think they could be made in rural Africa. You would just need to import the mirror strips.  

regards
Roger

--------------------------------------------
On Wed, 6/14/17, Crispin Pemberton-Pigott <crispinpigott at outlook.com> wrote:

 Subject: Re: [Stoves] solar cooker response (changing thread name)
 To: "Dr. Dieter Seifert" <stoves at lists.bioenergylists.org>
 Received: Wednesday, June 14, 2017, 8:09 AM

 Dear Dieter

 Do you know the name(s) of the test methods used during that
 comparison, and did any of them make it to being accepted as
 an international solar cooker standard?

 Also, thank you for your clarifications and request that we
 consider the whole solar sector is not a single
 'thing'. Because solar cookers require a backup
 device, often a biomass stove, we should pay attention on
 this channel. 

 Arising out of the Sout‎h African GTZ (at the time)
 project is the realisation that the biomass stove has to be
 rapid lighting. By the time the cook gives up on the solar
 cooked meal, the need for immediate heat is obvious. The
 report on the project should
  be available on line. To be practical, the biomass and
 solar stoves should be marketed as a pair. We toyed with the
 idea at the time that the biomass stove could be built into
 the solar cooker. 

 Generally speaking the solar cooker cost a lot more than a
 back up stove. 

 Regards 

 Crispin 
 ‎

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 Dear Stovers,

 A source of confusion concerning solar cookers is the large
 variety of devices, all of them called "solar
 cookers". At the Plataforma Solar/Almeria/Spain there
 was an International Solar Cooker Test by Eurpoean Committee
 for Solar Cooking Research in 1994 with
  25 participating devices. One of them did not cook at all;
 the SK parabolic cooker (1.4 m reflector diameter) brougt 48
 liters of water to the boil per day. Some cookers had direct
 access to the pot, others not. Some were only applicable for
 special tasks,
  etc. 

 Thus, general judgments are problematic. Solar
 cooking is a great opportunity with a high variety of
 applications. Problems can be overcome, but persistence is
 necessary, similar e.g. to the development of bicycles.

 Kind regards,

 Dieter

 Am 14.06.2017 um
 03:46 schrieb Michael N Trevor:

 Here in the Marshall Islands, the another
 science teacher wanted them thrown away because they were
 bulky and had no value in classes centered on environmental
 science and climate change. Of course we are only about 2/3
 meters above sea level

 On Wed, Jun 14, 2017
 at 1:01 PM, Crispin Pemberton-Pigott
 <crispinpigott at outlook.com>
 wrote:

 Nikhil

 Let's not assume
 anything.‎ These were the findings of the study which was
 a multi-year attempt to find out if there was any long term
 reason to get involved in the promotion
  of solar cookers. 

 The conclusion was, no. ‎And
 they swore them off. For them, if they had a chance anywhere
 that was the ideal place, and it was not
 viable. 

 Very sane. 
 Crispin

 Crispin;

 You have listed enough reasons to dispute the sanity of
 GIZ experts. 

 Nikhil

 On Jun 13, 2017, at 11:35 AM, Crispin Pemberton-Pigott
 <crispinpigott at outlook.com>
 wrote:

 Solar
 concentrating cooker:

 One
 of the main problems encountered with solar cookers (K14,
 K16 and so on) in the last big GIZ effort in North-West
 Province of South Africa was, in spite of the rural
 location, theft of the stoves for sale
  to scrap merchants. Aluminum is valuable. 

 Another
 common problem is wind tipping them over.
 A
 third is wind-blown dust getting into the food.
 A
 fourth is theft of the food.
 A
 fifth is storage of the unit. 

 People
 have little space in their homes and storage of a valuable
 cooker outdoors is not practical.

 GIZ
 spent about 7m Euros on that project and declared no further
 interest in solar cookers.

 Crispin

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