Re: Pot jacket with beaded spacer

[AJH <andrew.heggie@dtn.ntl.com>]

On Sat, 5 Jan 2002 12:54:03 -0400, "Kevin Chisholm"
<kchishol@fox.nstn.ca> wrote:

>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.

I agree from the pictures the drag of the surfaces would be high, in
my attempts at implementation I brazed on 50mm "flights" to maintain a
50mm by ~100mm flue path. I actually had concluded the helical flights
would best be formed in the stove rather than the pot to keep the pot
price low. I can provide pictures of my attempt but have never
fathomed out how to upload to my webspace. I have set this aside as it
was rather more complex and involved a concept more similar to the
storm kettle but with the flue gases making passes over both inner and
outer surfaces, I failed to make it well enough to be watertight.
>
>2: The sidewalls of the pot would be sure to find any soot components in the
>products of combustion

As would any cold surface, pot included. Hence ensure more complete
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.

Which is yet another reason to look at forced draught.

AJH With a belated Happy New Year to all stovers

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