[Stoves] Sun Buckets: off topic news, introduction

Wed Jan 4 15:28:33 CST 2017

Paul

We worked on solar/biomass heat storage stoves about 25 years ago.  You
must protect the heat storage medium from the flame.  We were using
evacuated tube collectors that raised superheated steam that circulated
through the heat storage medium.  Worked really well but was very expensive.

The ideal system is to use heat pipes to take the heat from the flame zone
and store in the phase change material.  Although this adds to the cost it
means you phase change material will have a long lifetime.

Regards
Stephen

On Thu, Jan 5, 2017 at 4:14 AM, Paul Anderson <psanders at ilstu.edu> wrote:

> Ron and all,
>
> I am studying the limited info about the Sun Bucket, and finding enough to
> agree that it could well be compatible with TLUD stoves (and to a lesser
> extent with other biomass stove-types.).   So it is not "off-topic" if, as
> Ron says, it can relate to biomass stoves.
>
> I doubt that it is only $50 if including a 1.5 meter solar dish.
>
> I will report back after I have direct contact with the company.
>
> Paul
>
> Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
> Email:  psanders at ilstu.edu
> Skype:   paultlud    Phone: +1-309-452-7072 <(309)%20452-7072>
> Website:  www.drtlud.com
>
> On 1/3/2017 7:30 PM, Ronal W. Larson wrote:
>
> David and list  - and cc some solar cooking friends
>
> Congratulations on this modification of the usual solar cooker.  And on
> the two awards that Sun Buckets has already won.
>
> It might seem you are on the wrong list - as we get little traffic re
> solar cookers - and our “biomass” address would suggest this is normally be
> the wrong place.   But I see three connections (that I have mentioned
> recently to the ccs), that make this entirely appropriate for out stove
> list.
>
> a).  There could be reasons to employ the same storage concept at a family
> (maybe neighborhood) level with any form of biomass stove.  I think it
> would fit especially well with TLUD stoves - as they could be designed at a
> large (one full day of cooking) size - and one day’s cooking could be much
> less time consuming than at present.  No solar involvement at all in
> approach a).
>
> b).   There could be good reason for option a)  (such as very high fuel
> costs) to also want to couple a fully biomass approach with (zero fuel cost
> ) solar.
>
> c).   Every solar option needs a backup - and biomass is the usual choice
> (except in the USA).
> The backup need not make charcoal - but the solar cookers can never be
> carbon negative;  TLUDs can make that happen.  Which won’t happen normally
> with a liquid (LPG) etc.
>
> So I’d like to continue this dialog with anyone interested.  Because of
> all the option a), b), c) possibilities,  this dialog could remain on this
> list.  I suggest we stay away from the solar-only topic you brought to us.
> And we can leave this list if a few think it is detracting from our biomass
> stove dialog.
>
> I was employed at what is now NREL in Golden Colorado and have several
> friends with extensive experience in high temperature thermal storage (even
> little myself). I’ve been a member of SCI on and off.
>
> My friend Dr. Salih Hamadto (in Khartoum Sudan) has sold many
> concentrators of the Scheffler variety - which I think might end up being a
> preferred approach -  instead of paraboloids.  All the ccs know about
> biochar - which I think has a much more natural fit with your nice idea
> than our rocket enthusiasts.
>
> Ron
>
>
>
>
> On Jan 3, 2017, at 12:51 PM, David Stein <ambwat at gmail.com> wrote:
>
> Dear All,
>
>
> I am a newcomer to the Stoves list but I’ve spent some time in the
> household energy sector in developing Vanuatu which is where I met Nikhil.
>
>
> I am fascinated by solar cooking these days.  There are many potential
> socio-economic and environmental benefits of solar cooking and they are all
> very seductive.  Just thinking about fuel-free and emission-free cooking
> is intoxicating.
>
>
> However, it seems that it is difficult to achieve the potential benefits
> of solar cooking (especially in the developing world) largely because those
> that dwell in hot climates (which is where much of the developing world
> seems to be located) have developed lifestyles that minimize exposure to
> the sun whereas most methods of solar cooking require the cook to be out in
> the sun, often at times of the day that aren’t typical cooking times.  These
> facts make the difficult task of changing the cooking habits of cooks even
> more challenging.
>
>
> But it appears as though the Sun Bucket http://www.sunbuckets.com/  “cracks
> all of these nuts.”  This amazing innovation is “charged” with the heat
> of sunshine and the heat is stored in a “sun bucket” (phase change
> “”battery”) where it can be used when (like in the evening or early
> morning) and where (like inside a kitchen) it is needed.  It cooks as hot
> as cooking on fire and existing cooking pots and pans can be used so there
> is minimal need for changes in cooking behavior.  It also seems very
> affordable.  I guess it’s what they call transformational.
>
>
> It looks as though a Sun Bucket should be a part of every integrated
> coking scheme (solar cooking when it's sunny, using an Improved Cook Stove
> when it's not, and maybe using a retained heat cooker with both) everywhere
> the sun shines in the developing world.  I can hardly wait for the Sun
> Bucket to be unleashed to the world-wide market of cooks that could really
> use them.
>
>
> Best wishes for the coming year.
>
> David Stein
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