[Stoves] Solar Powered Stoves Relevant?

[Ingelore Kahrens]

Hello all,

I am asking myself: Who can afford such a device? Who has the space to 
store it when not in use? And - in case the in-built bowl cannot be 
removed - wouldn´t it be too clumsy to clean it?

Ingelore Kahrens


Am 06.07.2016 um 22:43 schrieb Crispin Pemberton-Pigott:
>
> Dear All Stored Heater Lovers
>
> I have previously reported here a solar cooker that was built by 
> German students are Mercedes Benz in the 90’s. It was shipped to South 
> African and later ended up at St Joseph’s Mission near Manzini, 
> Swaziland. I was tasked to get it working.
>
> There were three of them, as I recall. The collector was a manifold of 
> reflector-focused copper pipes that circulated peanut oil by 
> thermosiphon. The storage unit was a tank of peanut oil under the 
> collector. The cooker was a built-in bowl that was heated from below 
> by being in contact with the hot peanut oil rising from below by 
> convection. It stored a lot of heat and could reach a temperature well 
> over 100 C.
>
> Food was placed in the built-in pot and as the oil cooled, it would 
> pass back to the tank and hot oil would rise automatically.  Heat 
> could be collected all day and used for cooking in the evening.
>
> At least that was the plan. The most serious design problem was that 
> the rate of oil flow past the pot was not high enough to induce a 
> rolling boil. It just couldn’t do it. This was the conclusion after 
> analysing how much heat it could deliver. There was a lot of heat 
> available in storage, but it couldn’t be ‘pumped out’ fast enough to 
> give a serous cooking experience.
>
> The options to make it work are to hand-pump the oil (easily 
> accomplished) or to size the components so that the heating rate was 
> adequate to being water to a boil and ‘boil it’. People want some form 
> of a rolling boil. Basically it worked, and could heat water to 100C. 
> It was the heat flow rate that was lacking.
>
> If a similar system can produce a change of state with lots of latent 
> heat, great! Maybe the materials involved will not even be that exotic.
>
> Regards
>
> Crispin
>
> Hi Daniel,
>
> This report with the badly photo-shopped pictures turn up somewhere 
> periodically. You will not be able to find the product on the market – 
> I guess it doesn’t exist in the real world as a commercial product.
>
> Cheers
>
> George from the ever diminishing jungle
>
> *From:*Stoves [mailto:stoves-bounces at lists.bioenergylists.org] *On 
> Behalf Of *Daniel-John Peterson
> *Sent:* 06 July 2016 09:32
>
> Hi all,
>
> What do others think about solar powered stoves?
>
> It seems relevant to our cause but I worry about the pollution 
> involved in manufacture and disposal.
>
> Article below refers to "the Lithium Nitrate acting as a battery 
> storing thermal energy for 25 hours at a time. The heat is then 
> released as convection for outdoor cooking."...
>
> http://inhabitat.com/wilson-solar-grill-stores-the-suns-energy-for-nighttime-fuel-free-grilling/
>
> I appologies if this is off-topic.
>
> Daniel…
>
>
>
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