[Stoves] Inner color of combustion chamber?

[alex english]

Dean,
I'm interested in how you would measure success. Lower particulates or
temperature rise?
Where on the scale of combustion chambers are you now. The thermally worst
being a cold water jacket that wicks all the heat away to the thermally
best being perhaps a reflective cerafelt.

If you had a steady state radiant flame from a carbon containing fuel
(something a TLUD is good for) and you swapped combustion chambers could
you get points on  graph? Would you then know if there a realistic gains to
be made pursuing better combustion chambers? I've always thought that these
basic questions could have answers with a controlled experimentation.

What is the excess air level in a Rocket stove? Is it safe to say that at
200% or 300% excess air the benefits of combustion chamber improvement will
be small?

You have some of the tools to put bracketing numbers around this topic.

Alex

On Sun, Apr 26, 2015 at 10:54 AM, Bamboo Science Group <
greg at bamboosciencegroup.com> wrote:

> Dean et al,
>
> Great comments by Kirk and AJH,
> I think the quick answer is yes.
>
> According to Thermoworks.com, Carbon in the form of candle soot (inside
> of stove)
> has an emissivity of 0.95 and polished aluminum ( outside of stove) is
> 0.05. So then in the "as used" conditions, this what you have.
> So yeah black inner, shiny outer is a good first order design goal.
>
> As you well know, the conditions of stove use are dynamic, e.g. initial
> heating where the
> Cp of the inner wall has to be overcome ( heat up) is different to the
> flame temp and swirl inducing inner wall surface dynamic requirements but
> in the first cut these are in the noise levels of consideration.
> G
>
> Sent from my iPad
>
> On Apr 26, 2015, at 8:10 AM, ajheggie at gmail.com wrote:
>
> [Default] On Sat, 25 Apr 2015 22:57:25 -0700,Dean Still
> <deankstill at gmail.com> wrote:
>
> Hi G,
>
>
> Just wondering if black on the inside of a metal combustion chamber and
>
> silver on the outside is a beneficial combination.
>
>
> Given that the re radiating of heat from the wall to the interior
> depends on both emissivity and the 4th power of the absolute
> temperature of the wall  just insulating the wall will have a bigger
> effect even if this means the emissivity is lower.
>
> Downside is that in keeping the metal surface hotter you are probably
> lessening its life.
>
> AJH
>
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