[Stoves] ***SPAM*** Re: ***SPAM*** Re: ***SPAM*** Re: ***SPAM*** Re: Stoves Digest, Vol 149, Issue 10

[Kevin McLean]

Can this be accomplished by making the bands taller?

On Tue, Jan 17, 2023, 3:32 PM Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Kevin
>
>
>
> >What are the functions the of the enclosure?
>
>
>
> Yes you have the right idea.  The fire is too open to heat the pot
> effectively from than far below. You have to channel the hot gases upwards.
>
>
>
> You want to build a mud brick enclosure with one open side.  If they can
> afford it a piece of roofing or other metal can be leaned against the
> opening when the fuel is burning.
>
>
>
> >I'm sure it will block the wind when used outside.
>
>
>
> Do not fear “blocking too much”.  It takes very little air to burn dung.
> Leaks are large and the containment is important.
>
>
>
> Will the mass steal heat that could be available to the cookpot?
>
>
>
> No, it will greatly increase it because there are huge radiative and hot
> gas losses out those big openings. If you stacked the bricks well, you can
> probably adjust the gaps to create primary and secondary combustion, which
> his important for dung. Remember, it is important to restrict the primary
> air supply to a dung fire
>
>
>
> Regards
>
> Crispin
>
>
>
> On Tue, Jan 17, 2023, 2:39 PM Crispin Pemberton-Pigott <
> crispinpigott at outlook.com> wrote:
>
> Dear Kevin
>
>
>
> That would cook so-o-o much better if you surrounded the fire with
> bricks.  You could leave access on one side, but I think a spare piece of
> sheet metal leaning against the hole to close off all air would do just as
> well.
>
>
>
> There is going to be a lot of air leaking between the bricks so try
> surrounding the whole fire.  Maybe it would take 7 stacks of 4.
>
>
>
> Those bricks were probably moulded using a wooden frame with 6 of so
> formed at a time.  That same principle can be used to make a wooden frame
> with slots.  Fill the whole thing at once, and tip them out to dry.  Same
> as with bricks.   The technique is called “slop-moulding”.   You make it
> wet enough to flow reasonably when pushed, throw in a load, push down a bit
> to fill the cavities, then strike it off with a flat stick.  Tip out the
> set of 6 or 8 “sticks” which may require the mould cavities to be tapered
> 10 degrees or so, because it is sticky.
>
>
>
> After some time in the sun they will be dry enough to stack criss-crossed
> for a long drying period like a week or a month. Being very dry is
> important.
>
>
>
> Good luck
>
> Crispin
>
>
>
> *From:* Stoves <stoves-bounces at lists.bioenergylists.org> *On Behalf Of *Kevin
> McLean
> *Sent:* Tuesday, January 17, 2023 8:21
> *To:* Discussion of biomass cooking stoves <
> stoves at lists.bioenergylists.org>
> *Subject:* [Stoves] ***SPAM*** Re: ***SPAM*** Re: ***SPAM*** Re: Stoves
> Digest, Vol 149, Issue 10
>
>
>
> Dung has better uses than cooking fuel.  (Some of the nutrients for
> fertilizing can be extracted by washing.)  But hundreds of millions will be
> using dung as a cooking fuel for decades. Let's improve it.
>
>
>
> We've also been testing dung sticks upright in a metal band.  Preliminary
> results indicate they burn much hotter and cleaner than dung patties.  Here
> is a video
> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1zlTqdTdTBOTlRUt55mPDlonCEvRzfdrL%2Fview%3Fusp%3Dshare_link&data=05%7C01%7C%7C55b1a24086d84ad67f2608daf8c61ae5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638095826989766902%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xEpdnEg0zzSZ1VVvtt6t7pWMmF6xcnA6hJvjKV4AWko%3D&reserved=0>.
> But this really needs to be tested in India by someone who cooks with dung
> patties.
>
>
>
>
>
>
>
> Kevin
>
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