[Stoves] Why not high mass stoves?

[ajheggie at gmail.com]

Here is a post from Bodie that I have shrunk the images to get it
under the size limit for posts to [stoves].AJH


Bodie Cabiyo Wrote

>Hi Dean,
>
>Thank your for the suggestion, I'll give that a try.
>
>I'm working on a broad-scale sustainable development program in India,
>developing a stove model that can be fabricated by local village women.
>My latest design is a *mixed-materials rocket stove* that can be made with
>three tin cans and a traditional mud mixture. So far, it's working
>moderately well: it is clean burning when the fuel is small, but when fuel
>size increases to anything above 1/2 inch in diameter the fire is usually
>feeble.
>Eventually, I would like to incorporate an Anila stove-like design element
>in which the outer chamber is a pyrolysis chamber that feeds into the main
>combustion chamber.
>
>*I would greatly appreciate some feedback on my design!*
>Here's a few pictures (with a 7-inch diameter can for size comparison):
>
>
>
>
>?
>
>Thanks,
>Bodie
>
>On Sun, Nov 2, 2014 at 11:36 PM, Dean Still <deankstill at gmail.com> wrote:
>
>> Hi Bodie,
>>
>> I've liked the pot skirt stoves creating a 7mm channel gap between the pot
>> and the skirt made from sand/clay plus as much finely ground light weight
>> organic material as possible (increases insulative value).  Not clean
>> burning but effectively reduces fuel used to cook.
>>
>> What have you been doing?
>>
>> Best,
>>
>> Dean
>>
>> On Sat, Nov 1, 2014 at 8:51 PM, Bodie Cabiyo <bodie.cabiyo at gmail.com>
>> wrote:
>>
>>> Hi Huck,
>>>
>>> I've been working on adapting high-mass stoves to have better thermal
>>> efficiency because of that very article.
>>>
>>> Simply put, the problem is with the specific heat of the insulating
>>> material. True, high-mass materials like earth or sand have insulative
>>> value, but they have very high specific heat and thus absorb much of the
>>> heat that would go into a cooking vessel. In contrast, sheet metal has a
>>> low specific heat, so it absorbs relatively little thermal energy to reach
>>> a maximum temperature, after which point you're only heating the air
>>> surrounding the stove. Air, of course, has very low specific heat and thus
>>> it takes very little energy to warm the air immediately next to the stove
>>> body (though it would be more ideal to trap a layer of air so that you're
>>> not continually heating new air).
>>>
>>> Hope this helps!
>>> Bodie
>>>
>>> --
>>>
>>> *Bodie Cabiyo*
>>>
>>> Professional: carbonalternatives.org
>>> Personal: concentricchange.wordpress.com
>>>
>>> *Food for Thought:*
>>> *"A mountain is composed of tiny grains of earth. The ocean is made up of
>>> tiny drops of water. Even so, life is but an endless series of little
>>> details, actions, speeches, and thoughts. And the consequences whether good
>>> or bad of even the least of them are far-reaching."*
>>> - Sri Swami Sivananda
>>>
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>>
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