[Stoves] Vietnamese brick kilns

[Marc Pare]

> I suspect it is worth looking at the ash and char content to see if there
is not a mistake being made relative to the application of the Siegert
constants.

> That will affect the final number and are rooted in the chemical
composition of the fuel, which has of course changed.

If I plug in the values for coal or coke, I'm still within 10% of my
calculated losses. So, for now, I don't think accounting for the changing
Siegert constant (and changing CO2 max) would influence the conclusions for
my particular case  (massive stack losses because of excess air).


I pasted the Seigert constants table at the bottom of the email if anyone
is curious about its variation for different fuels.


That said, I'm really curious anyway!

I've been snooping around for someone to do ultimate and proximate analysis
for me around Vietnam. This experiment may help convince someone to let me
borrow the equipment.


> You are doing very good work with nearly nothing backing you.****

Thanks for the compliment. It's been fun seeing how far we can get with a
lean team. I wouldn't run every project on such constrained resources in
the future, but it seems to have been a good stimulus for cost-cutting
design discipline as well as a nice way filter for partners (since you can
only sell your ideas and work and not your $$)

[image: Inline image 1]

Marc Paré
B.S. Mechanical Engineering
Georgia Institute of Technology | Université de Technologie de Compiègne

my cv, etc. | http://notwandering.com


On Sun, Oct 21, 2012 at 6:34 PM, Crispin Pemberton-Pigott <
crispinpigott at gmail.com> wrote:

> Dear Marc****
>
> ** **
>
> Your post was a ‘keeper’. Thanks so much. You are doing very good work
> with nearly nothing backing you. ****
>
> “What I think is responsible is that the particular chemical structure of
> rice hull (high ash, a silica skeleton) acts as a brake on the "char
> reactions" …”****
>
> I suspect it is worth looking at the ash and char content to see if there
> is not a mistake being made relative to the application of the Siegert
> constants. That will affect the final number and are rooted in the chemical
> composition of the fuel, which has of course changed.****
>
> ** **
>
> I believe we will one day be able to compensate for this in real time by
> using a sum of the gases emitted. So far, just feeling for a way in the
> almost-dark. Thanks for identifying the discrepancy and let’s keep looking
> for the reason. You can at least guess Siegert constants for the char based
> on a guess at its chemical composition and report the difference it makes
> in the final calculation. If it is greater than your measurement errors we
> have something significant to talk about.****
>
> ** **
>
> I have been having a very interesting time in Java talking to people using
> stoves for ‘industrial’ purposes. We are going to have to redefine what
> ‘domestic’ stoves are! Rice hull is a widely available fuel and I have yet
> to see a decent burner for them locally save a photo of an exact knock-off
> of Roger Samson’s Mayon Turbo Stove.****
>
> ** **
>
> Here, in reply, is a simple test result for thermal efficiency on
> something made locally. It shows how the thermal efficiency varies
> systematically with power giving a policy manager valuable information
> about how it performs in different circumstances. This was for one pot size
> only (large). Different pots (and woks) yield different profiles and
> efficiencies at the same power.****
>
> ** **
>
> ****
>
> The trend line is for both water heating and boiling.****
>
> ** **
>
> ** **
>
> ****
>
> The instantaneous efficiency values are provided for entertainment
> purposes and are jumping around due to the (im)precision of the scale. The
> overall efficiency of 23.0% is based on the overall mass measurement which
> is quite precise (1 part in 450) so it meets (that part of) the IWA
> precision requirement for Tier performance claims. The two charts are
> extracted from the same set of data.****
>
> ** **
>
> I wondered if the thermal efficiency was related to the water temperature
> but have not corrected these thermal efficiency numbers for the power level
> at the time. Here it is anyway:****
>
> ** **
>
> ****
>
> The trend is for the heating portion only. It is too shaky to make a
> claim, I want to see the power-corrected plot.****
>
> ** **
>
> Regards****
>
> Crispin****
>
> ** **
>
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