Re: Pot jacket with beaded spacer

["Kevin Chisholm" <kchishol@fox.nstn.ca>]

Dear Lanny

I think you have quite a neat idea here in concept. It would certainly work
well to improve heat transfer.

However, I would anticipate the following problems:

1: Pressure losses would require increased draft to ensure that all the
products of combustion were drawn through the passages.

2: The sidewalls of the pot would be sure to find any soot components in the
products of combustion

3: This system may end up being so effective as a heat transfer device that
it becomes self defeating. Specifically, it may extract so much heat from
the products of combustion that there is insufficient "waste heat" in the
off gas to create draft sufficient to run the stove at its original power
level.

It is possible that with the rolled bead, you may have "too much of a good
thing." Possibly you would get better net results if you simply used a
similar jacket, but with 4 centering dimples, to center the jacket around
the pot. Your effective "gas passage area" would be much larger, and
pressure drop would be correspondingly much smaller.

Best wishes with your tests!! Please keep us posted on your results.

Kindest regards,

Kevin Chisholm
----- Original Message -----
From: "Lanny Henson" <lanny@roman.net>
To: <stoves@crest.org>
Sent: Saturday, January 05, 2002 12:04 PM
Subject: Pot jacket with beaded spacer


> How about using a bead to space and form a spiral channel pathway around
the
> pot to maximize the time hot gas spends on the pot. Here are two photos
> about 50kb each of a first attempt at building one. I only have about 1.5
sq
> in of channel space with this first test piece, not enough.
> http://www.roman.net/~lanny/pj1.jpg
> http://www.roman.net/~lanny/pj2.jpg
> Lanny
>
>
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