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

[Crispin Pemberton-Pigott]

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<mailto: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<mailto: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<mailto: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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