If the pot holders are too high, all the heat may flow to one side of the pot,
especially if there is wind or air turbulence in the cook space
A smaller gap spreads the flow out across the bottom of the pot. The increased
velocity also helps.
The problem is that with a multiple pot stove you have a cook top, and you
don't want the heat flow to touch the cook top.
With a short potholders the heat scrapes the stove top.
You are trying to cook the pot not the stove. I learned this using a
rectangular cook top which wants to warp when heated.
With the School Lunch Cooker I let the burner extend 1"/25mm above the cook top
and used 2"/50mm tall pot holders. This puts the heat on the pot and shields
the stove top with a layer of dead air.
----- Original Message -----
From: Sarbagya R. Tuladhar
To: Discussion of biomass cooking stoves
Sent: Friday, September 20, 2013 4:16 AM
Subject: Re: [Stoves] A doctoral thesis on stoves
12-15 m high ???
Cheers
Sarbagya
On 20/09/2013, at 4:35 AM, Crispin Pemberton-Pigott wrote:
Very good paper with some novel adaptions of the test methods, approaches
to the community and the retrofitted device.
The money photo is this one:
<image003.jpg>
The pot rests are far too tall and create several simultaneous problems for
effective heat transfer. The addition of turbulators is one way to address some
of this error.
Given the reported power level the pot rests should be about 12-15m high
and that would reduce the initial problem. It would be interesting to see a
stove built with both changes.
Regards
Crispin
+++++++++++
List:
1, I recommend this recent new (free) technical stove paper:
http://www.energsustainsoc.com/content/pdf/2192-0567-3-16.pdf
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