[Stoves] Lanny Henson pot insulator

[Lanny Henson]

Frank, thanks for testin my stove.

1- Even though my pot has a smaller bottom, there is more surface area, with 
the tall sides, to capture heat, when used with a pot shield.

2- The pot module does create draft.

3- The double wall insulated construction does make serving and dispensing 
easy and safe. The pot and module become one unit to cook, hold, serve and 
dispense. You can even clean the pot without removing it, avoiding soot.

4- The pot module can be used with most any type burner. I am testing a 2 
liter prototype with a top jet, soda can, alcohol stove.

Also the pot module also functions as a "retained heat cooker" when capped.

My question is that if fins can conduct heat to a pot, then will fins can 
conduct heat away from a pot, in retained heat mode?

It has been my experience that by using a tall pot with a double walled 
insulated shell, that has a narrow gap to the pot, and a smaller fire, very 
little heat escapes,

and by capping the system you ca rertain heat.

This option also has the benefits of being easy to build by hand, and being 
inexpensive. The materials cost about $5 or 6, and a 6 liter SS pot/lid cost 
about $14 to15.

I am working on a how to book and video for pot modules. I will also have 
low cost pots available. My target date is May 08.

Lanny Henson

----- Original Message ----- 
From: "frank" <frank at compostlab.com>
To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
Sent: Wednesday, March 05, 2008 3:38 PM
Subject: [Stoves] Lanny Hanson pot insulator


> Dear group.
> When at ETHOS Lanny sent me home with his stoves and my daughter and I
> have been having fun with them.
>
> Working on a science project we compared a three stone fire boiling 5 L
> water to a pot with, and without,  the pot holder Lanny produced.
> Still working out the numbers but what a difference.
> 1) much less wood was needed. (hot gases squeezed between the pot and
> insulated metal jacket)
> 2) much less smoke produced from the fire (more draw so more oxygen? or
> longer hot space for organics to burn?)
> 3) much safer to use because the hot pot of boiling water had a 'jacket'
> of warm metal one could pick up and pour off the water.
>
> Now if Dale could put his fins in the space between the pot and outside
> insulated layer where the hot gases go.......
>
> I can see pots being sold with this insulated jacket with a gap for the
> hot gases built onto the pots to be used on the three stone fire. Very
> simple.
>
> Regards
> Frank
>
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> -- 
> Frank Shields
> Soil Control Lab
> 42 Hangar way
> Watsonville, CA  95076
> (831) 724-5422 tel
> (831) 724-3188 fax
> frank at compostlab.com
> www.compostlab.com
>
>
>
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