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<p>Hello all,</p>
<p>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?</p>
<p>Ingelore Kahrens<br>
</p>
<br>
<div class="moz-cite-prefix">Am 06.07.2016 um 22:43 schrieb Crispin
Pemberton-Pigott:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Dear
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">All Stored Heater Lovers<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">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. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">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. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">Crispin<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">Hi Daniel,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-GB"> </span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-GB"> </span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB">George from the ever diminishing jungle<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-GB"> </span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-GB"> </span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"
lang="EN-GB"><o:p></o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"
lang="EN-US"> Stoves [<a moz-do-not-send="true"
href="mailto:stoves-bounces@lists.bioenergylists.org">mailto:stoves-bounces@lists.bioenergylists.org</a>]
<b>On Behalf Of </b>Daniel-John Peterson<br>
<b>Sent:</b> 06 July 2016 09:32<br>
<br>
<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:black" lang="EN-GB"> <o:p></o:p></span></p>
<p><span style="color:black" lang="EN-GB">Hi all,<o:p></o:p></span></p>
<p><span style="color:black" lang="EN-GB">What do others think
about solar powered stoves? <o:p></o:p></span></p>
<p><span style="color:black" lang="EN-GB">It seems relevant to
our cause but I worry about the pollution involved in
manufacture and disposal.<o:p></o:p></span></p>
<p><span style="color:black" lang="EN-GB">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."... <o:p></o:p></span></p>
<p><span style="color:black" lang="EN-GB"><a
moz-do-not-send="true"
href="http://inhabitat.com/wilson-solar-grill-stores-the-suns-energy-for-nighttime-fuel-free-grilling/">http://inhabitat.com/wilson-solar-grill-stores-the-suns-energy-for-nighttime-fuel-free-grilling/</a><o:p></o:p></span></p>
<p><span style="color:black" lang="EN-GB">I appologies if this
is off-topic.<o:p></o:p></span></p>
<p><span style="color:black" lang="EN-GB">Daniel</span><span
style="color:#1F497D" lang="EN-GB">…</span><span
style="color:black" lang="EN-GB"><o:p></o:p></span></p>
</div>
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