[Stoves] Another high performance stove located

[alex english]

Crispin,
The data summary from the 15 minute test is below. There was some ups and
downs associated with grate movement and primary air. I don't know the burn
rate but 10Kw+/- is a reasonable guess. At its best the CO measured as low
as zero and PM 21 mg/m3.
This stove is not a TLUD or a fan stove, but there is potential for fly ash
to be a portion of the PM.

Alex






O2:10.6%COv:137ppmCOn:131mg/m³erw. U COn:35mg/m³COn - U:0.096g/m³mStF:1.7mg
mSt:33mg/m³mSt(O2):25mg/m³erw. U mSt(O2):9mg/m³mSt(O2) - U:0.016g/m³Volume:
44.3Nl

On Tue, Nov 10, 2015 at 1:25 PM, Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Alex
>
>
>
> The average PM per MJNET was 8 mg 14 minutes and 40 seconds after
> ignition. The pot was put on 4 minutes after 15 seconds after ignition.
> That means there was enough heat gained by the pot in 10 minutes and 25
> seconds to bring the average in line with LPG.
>
>
>
> You are correct the LKPG would start cleaner.
>
>
>
> Because LPG composition is not ‘standard’ in any way, it helps to remember
> that a burner head may not be optimised to the fuel, even though it is
> gaseous. Because it is common to have the LPG flame touching the pot, it is
> not such a big surprise that the wood pellets burn cleaner, if the designer
> took care of that aspect.
>
>
>
> I recall from the Stove Testing Camp in July at your place, the burner you
> demonstrated was exceedingly clean. Was there a viable number from the PM
> machine? I do not recall that there was. If you know the EA value and the
> burn rate, and there is a raw concentration number, we could calculate it.
> I am interested to know if your burner is that clean.
>
>
>
> Regards
>
> Crispin still mopping the floor in Accra
>
>
>
> +++++++++
>
>
>
> The cold start is not ignored. The measurement goes from ignition to the
> completing of the cooking cycle.
>
>
>
> Because there is hardly anything to measure, I caution again that such
> results are to be viewed skeptically until a special experiment can be
> conducted.
>
>
>
> The ignition is the smokiest portion of the test so how the fuel is
> ignited comes to dominate the total emitted. Choosing a different kindling
> material will give a statistically different result. This is the case as
> well in Mongolia where the stoves are now so clean it has devolved into a
> fire lighting competition. Most of the stoves don't emit anything after
> they get going well.
>
>
>
> Still, I take you point. If the LPG rate is 8 mg/MJ delivered, as was
> cited by an Indian delegate to the ‎S4G conference a couple of weeks ago,
> then at some point the pellet stove will match it because almost all the PM
> is emitted by minute six.
>
>
>
> I will have a look.
>
>
>
> Regards
>
> Crispin in Accra
>
>
>
> Crispin,
>
> So the cold start is ignored? Assuming that propane starts cleaner??, how
> long does the stove have to run before the total gross emissions, including
> the start-up, match those from the propane stove?
>
>
>
> Alex
>
>
>
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