Tony,
Thank you for the offer to measure the fireboxes on your coal-fired locos. I
will do that. And I'd very much like to take a look at that G1MRA article
about firebox arches.
Today I sent off for a copy of Alec Farmer's book on boilers. Keith Taylor
encouraged me to read it.
Steve
Convect = heat transfer between solid and fluid (gas or liquid). A very
complex process that is dependent upon viscosity, turbulence, gravity
vector, temperature difference between "hot" side and "cold" side,
condition of solid surface, geometry, etc etc. Highly non-linear and
difficult to predi
Hi Steve and list.
I'd agree with that - it would be a long conduction path in the copper
tongue, but as the end of the tongue would get very hot a large temperature
gradient would help the rate of conduction mightily.
Another potential virtue of this would be that as the "tongue / arch" is
r
Steve:
Decoder ring says: convect=conduct
Jim
Steve:
I sure would convect heat directly to the bottom of the boiler.
Jim
I know this started off as a coal-fired boiler question, but I have
significantly improved the performance of spirit fired boilers by adding a
"brick arch" made of thin brass. Its function is twofold:-
a) it prevents cold air going straight up the tubes and
b) it increases the distance the alco
Jim,
Regarding Peter McCabe's addition of a "tongue" at the bottom of the boiler
which was bent up into the firebox: it seems like this would have increased
the heating area of the boiler as well, because the "tongue", being part of
the boiler shell, would conduct heat directly to the boiler con
The spring 2002 issue of the G1MRA Newsletter has an article by Peter McCabe
about incorporating an arch into the design of a G1 boiler. When he cut the
boiler out of the copper pipe he left a "tongue" at the bottom of the boiler
which he subsequently bent up into the firebox becoming the arch.
Hi Steve,
G1 Firebox Arches.
You can come over and measure the fireboxe's on my three coal fired
engines anytime. None have arches, although there was a very interesting
article in the G1MRA approx. one year ago (I will pull out the article for
you). This illustrated how to calculate
Yes Steve.
The various Nichrome /Inconel / stainless meshes were trieed with the
intent of producing a radiant source as you surmise. This is less
necessary with a coal fire obviously, but part of the aims of this bit of
experimentation was to make a multi - fuel boiler, which could use Meths
Jim,
Thank you for the feedback about the use of stainless and nichrome for
"brick" arches. Can I assume the nichrome was wire mesh? If sufficiently hot
it might make a good radiant heat source nearer to the crown sheet than the
bed of coals on the grate.
thank you also for the tip about overhea
Hi Steve.
Something similar using a stainless steel "Brick Arch" has been done quite
successfully. I know also of some experiments with a "Nichrome" or similar
mesh equivalent.
By the way I go along with bronze or copper for stays, I have used Monel,
but that is overkill, far more hassle (an
Harry, Keith, Jeff, and Mike,
Your information is great. Now I have another question for the list about
gauge 1 coal-fired fireboxes. Has a "brick arch", or its equivalent, ever
been used in a gauge 1 coal-fired firebox? Or is it irrelevant because the
combustion path is so short in gauge 1 size?
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