[Stoves] Stove ID please - 2-pot stoves - testing needed

Marc Pare mpare at gatech.edu
Wed Jan 2 23:07:54 CST 2013


Here are JPEGS of the stove Gus just posted.

[image: Inline image 3][image: Inline image 2][image: Inline image 1]

Marc Paré
B.S. Mechanical Engineering
Georgia Institute of Technology | Université de Technologie de Compiègne

my cv, etc. | http://notwandering.com


On Wed, Jan 2, 2013 at 9:14 PM, Inversiones Falcon
<invfalcones53 at yahoo.com>wrote:

> Hi Krista thank you for your big help on my sketch I did not send the
> right charcoal stove so this is the sketch and pleas make sure Paul get it,
> the final prototipe will have an oven on top and also can be use as a
> biocharstove, I´m working on it. I have a prototipe all ready I´ll take
> some pictures and send them to you
>
> wish you the best of 2013 to all.
>
> Gus
>
>   *From:* Kevin <kchisholm at ca.inter.net>
> *To:* Discussion of biomass cooking stoves <
> stoves at lists.bioenergylists.org>
> *Sent:* Wednesday, January 2, 2013 7:50 AM
>
> *Subject:* Re: [Stoves] Stove ID please - 2-pot stoves - testing needed
>
>  Dear Christa
>
> Thanks very much. The figures displayed easily.
>
> Best wishes,
>
> Kevin
>
> ----- Original Message -----
> *From:* CHRISTA ROTH <stoves at foodandfuel.info>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> *Sent:* Wednesday, January 02, 2013 8:38 AM
> *Subject:* Re: [Stoves] Stove ID please - 2-pot stoves - testing needed
>
> check if that works
> happy new Year to all, Christa
>
>
>  Am 02.01.2013 um 12:05 schrieb Kevin <kchisholm at ca.inter.net>:
>
>  Dear Mark
>
> They are an Image, but in .png format. I can't open that format either!!
> :-(
>
> Would you be able to re-post them in .jpg format?
>
> Thanks!
>
> Kevin
>
> ----- Original Message -----
> *From:* Marc Pare <mpare at gatech.edu>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> *Sent:* Wednesday, January 02, 2013 1:45 AM
> *Subject:* Re: [Stoves] Stove ID please - 2-pot stoves - testing needed
>
> In case anyone needs these: I opened the Sketchup files and rendered them
> as images. They're attached.
>
> You can download Sketchup at http://www.sketchup.com/
> It's a free 3D modeling software that is designed to be intuitive to use.
> It's target audience is architecture drawings, but I've found it nice to
> bang out schematics for reports as well.
>
> Marc Paré
> B.S. Mechanical Engineering
> Georgia Institute of Technology | Université de Technologie de Compiègne
>
> my cv, etc. | http://notwandering.com
>
>
> On Wed, Jan 2, 2013 at 10:20 AM, Richard Stanley <rstanley at legacyfound.org
> > wrote:
>
> Michael,
> Presuming this is yourself speaking, cnet.com goes even further astray.
> Oh well, will go to Guatavo for the .skp file direct.
> Richard
>
>
> On Jan 1, 2013, at 8:52 PM, mtrevor wrote:
>
>  Like I corrected http://www.cnet.com/
>
> Michael
>
>
> ----- Original Message -----
>
> *From:* Richard Stanley <rstanley at legacyfound.org>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> *Sent:* Wednesday, January 02, 2013 2:26 PM
> *Subject:* Re: [Stoves] Stove ID please - 2-pot stoves - testing needed
>
> Michael,
> Are you sure that this  http://www.cnet.comoc/  is the right link: I
> can't open it on my Mac. /Safari server.
>  Richard
>
>
>  On Jan 1, 2013, at 1:32 PM, mtrevor wrote:
>
>  Paul and others if you were having trouble with Gustavo's sketch up
> images of the 2 pot stove Goolge Sketch up is available for free thru
> downloads at http://www.cnet.comoc/
>
> Michael
> Majuor
>
> ----- Original Message -----
> *From:* Paul Anderson <psanders at ilstu.edu>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> *Sent:* Monday, December 31, 2012 11:26 AM
> *Subject:* Re: [Stoves] Stove ID please - 2-pot stoves - testing needed
>
> Crispin and all,
>
> The Prakti 2-pot unit should be directly compared with the 2-pot unit from
> Envirofit.
>
> http://www.envirofit.org/products/?sub=cookstoves&pid=5    (to see a
> photo).
>
> Double-Pot Attachment Features
>
>    - The Double pot accessory with chimney is the perfect add-on for
>    customers who want the portability and ease of using the single-pot stove,
>    but need the extra cooking area for large families, festivals, or cooking
>    for visitors.
>    - The attachment is easily moved onto or off of the stove for quick
>    change ability but is steady and sturdy while attached.
>    - The chimney portion can be used as is - to move any minimal
>    emissions out of the face of the person cooking - or can be vented out of
>    the home. * Shown with G-3300 cookstove.
>
> And I am sure that there are other 2-pot stoves, but just not being
> stamped out and with such smooth edges.   Many of us have made such units.
>
> What is needed is some serious study of these useful features, whether
> built into the stove or as an attachment.   Issues to be studied include:
> heat transfer to EACH pot
> types of pots used (sit on top or inserted)
> insulation
> temperatures of the outside surfaces
> fuel efficiencies attributed to the second pot
>
> And of course, the ways of supplying heat to the 2-pot stove structure.
> The fact that both the Prakti and Envirofit units use Rocket combustion
> structures does not exclude use with other combustors, such as
> TLUDs and even fossil-fuel burners.
>
> Important note:  These 2-pot structures both (virtually all of them?) have
> a chimney because horizontal flow of the hot gases must eventually have
> some upward movement to maintain the draft (exceptions if there are fans in
> use).   For the TLUD combustors, the chimney is a nice enhancement of the
> draft.
>
> I did not understand Crispin's comment about keeping the smoke and flames
> together.
>
> It seems to me to be worth investigation the % of smoke that can be burned
> by keeping the smoke and flames together for a while.
>
> That is true for "stick-burners" like the Rockets.   But TLUDs are
> "gas-burners" (that make their own gases in the close-coupled gasifier
> reactors.)   What would be the best ways to get the best results with
> Rockets, TLUDs, or other heat sources?
>
> Regardless, this seems like a great topic for some research by the now
> "product-independent" laboratories for stove testing, such as CREEC and
> Zamorano and ARC.   But the question is:   who will pay for these tests,
> and who will release the results?   Past practices have been that "he who
> pays decides what will be released."   And the chances of having both
> PRAKTI and Envirofit pay and allow comparisons are about slim to none.
>
> And I am not going to pay for it.   And the testing centers get paid
> nothing for testing unless there are sponsors.
>
> So, I hope that the GACC will soon finance some comparative testings of
> stove STRUCTURES that are not just focused on the combustion devices.   AND
> then do some testing of those same STRUCTURES but with different systems of
> combustion, such as having Champion or Mwoto or Quad TLUDs under identical
> 2-pot structures..
>
> Happy New Year to all!!!
>
> Paul
>
> Paul S. Anderson, PhD  aka "Dr TLUD"
> Email:  psanders at ilstu.edu
>    Skype: paultlud  Phone: +1-309-452-7072
> Website:  http://www.drtlud.com/
>
> On 12/30/2012 4:24 PM, Crispin Pemberton-Pigott wrote:
>
>  Dear Richard in NW Obamaland****
> ****
> Agreed. I was looking at the size of the opening at the top and wondering
> how it burned. I have been working on the use of flame tubes a-la-BLDD6 and
> earlier versions where the fire is enclosed in a fairly small round channel.
> ****
> ****
> A couple of weeks ago I tried installing a 57mm I.D. flame tube in a
> horizontal draft two-pot stove (I will add pictures later) to see if the
> smoke could be burned post-pot-1. It worked pretty well. I do not yet have
> definitive numbers but as a design approach it definitely worked. There are
> a number of stoves that have far too much space after the fire, allowing
> the smoke and flames to take separate routs to the outlet.****
> ****
> So the stove in question has a huge outlet so if smoke manages to get to a
> corner, it has ample space to escape to the margins away from Pot 2. It
> seems to me to be worth investigation the % of smoke that can be burned by
> keeping the smoke and flames together for a while. There are several stoves
> with a suitable layout for this. One is the three-pot stove used in
> Indonesia consisting of separate clay round sections with interconnecting
> tunnels. If the tunnels were reduced in diameter to the point at which they
> became an impediment to gas flow, that would maximise the chance of burning
> the smoke. If the flame was entering the tube in the simple experiment I
> conducted, the smoke was dramatically reduced showing a reproducible and
> consistent effect.****
> ****
> I really like the cast iron grate in the Prakti stove with a thickened
> front bar that will resist banging from heavy wood sitting on it.****
> ****
> Regards****
> Crispin****
> ****
> ****
> Crispin,****
>  This seems to be c similar o what was coming from the Dutch TOOL
> foundation in (A ' dam)  in the late 70's. They were trying to replicate
> them thru our center (AATP) during that time but it never really took on.
> ****
>  Richard Stanley****
>  ****
>
>
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