[Stoves] Insulated pots

[Thomas Reed]

Dear Larry and All:

Loved your three stone stove posting.  If you can't make a WoodGas 
stove, at least get a good fire chamber with controllable air access.

As a matter of interest,

476 g of wood generates (476 g X 20 kJ/g) 9,520 kJ (assuming dry biomass)

5 liters (kg) of water require (5,000g X 80 C X 4.2J/o-g) 1,680 kJ to 
heat from 20 to 100 C. 

So your efficiency was 1,680/9,520 X 100 = 17.6%, less with wetter wood. 
------------------------------------------------------------------------
I suspect you knew what you were doing and that most three stove users 
don't maintain your excellent control and heat transfer.  I have always 
heard the more typical 3 stone stove was 5-10% efficient.  Close enough...

YOurs truly,

TOM REED               BEF
 

lannych wrote:
> The pot module/Three Stone Stove is an insulated pot with gap and performs 
> very well.
> It is of double wall construction and I have used mineral wool, fiberglass 
> and loose fill ash/char for insulation with good results.
> The Three Stone Stove only used  476 grams of wood to boil 5 liters with an 
> open fire
> http://www.bioenergylists.org/en/hensonthreestone
> I also used this pot module to boil, simmer and hold 5 liters with only 140 
> to 175 grams of charcoal using the CRAB Stove.
> http://www.bioenergylists.org/en/hensoncrab
> My yet to be disclosed BRAT Stove (Bamboo Rice and Tea) only needs 250 to 
> 275 grams of bamboo chips to boil, simmer and hold 5 liters.
> The pot module is more than "half the helper" if I may use Dr Martin Bolls' 
> words and should work with most any burner/stove.
> I plan to be more active with stoves this Feb and March and publishing a 
> "how to build the Three Stone Stove" is on my list. The methods are very 
> simple.
> My next prototype will be a grain drying and storage system that will dry, 
> pasteurize and fumigate (with CO) about 500 kilos of corn I hope. The system 
> will cost less than $50 US. I will attempt to store corn 3 years by 
> fumigating and pasteurizing as needed. When the grid goes down you are all 
> invited to my house for tortillas.
> Can't wait, on fire for stoves!
> Lanny Henson
>
>
> ----- Original Message ----- 
> From: "Robert Taylor" <rt at ms1.hinet.net>
> To: "Crispin Pemberton-Pigott" <crispin at newdawn.sz>; "Discussion of biomass 
> cooking stoves" <stoves at listserv.repp.org>
> Sent: Tuesday, January 09, 2007 9:54 AM
> Subject: [Stoves] Insulated pots
>
>
>   
>> Dear Crispin
>>
>>     
>>> The BEST energy reducer for cooking is an insulated (on top and sides)
>>> pressure cooking pot!
>>>       
>> What is a good insulating material(s) for such a jacket? Presumably it 
>> needs
>> to be fireproof (at least at the bottom), and preferably easy to clean and
>> not infiltrated or otherwised damaged by escaping steam or by hot wet food
>> if the pot boils over (especially if used with an ordinary pot instead of 
>> a
>> pressure cooker).
>>
>> When Martin was talking about tea-light candles a while ago I wondered 
>> about
>> using an insulating jacket, perhaps with a skirt that extends downward a
>> little below the pot, for slow cooking over a very small flame such as 
>> from
>> a candle. But a jacket that can also be used over a larger flame (from a
>> stove) without being damaged might be very useful too.
>>
>> I guess one way to protect the insulator from the contents of the pot 
>> would
>> be to invert a slightly larger pot over the cooking pot, and insulate the
>> outside of that. But the insulator still needs to be fireproof. Any
>> suggestions for suitable materials?
>>
>> Put a vent in the middle of the inverted pot to let combustion gases 
>> escape
>> and you have a glorified pot skirt. But would an insulated one outperform 
>> a
>> plain metal one by enough to make it worthwhile? And how would it compare
>> with a close-fitting insulating jacket?
>>
>> Best regards
>>
>> Robert Taylor
>>
>>
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>>     
>
>
>
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