[Stoves] Another high performance stove located

[Crispin Pemberton-Pigott]

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

On Tue, Nov 10, 2015 at 3:14 AM, Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Friends of Clean Cooking
>
>
>
> I have just reviewed another stove with a particulate production number
> that is very low. Any test result this clean is always suspect so hold the
> salt shaker, but we have more tests to analyse.
>
>
>
> The PM2.5/MJNET is between 2 and 3 mg/MJNET. That is lower than the claim
> from India for LPG which is 8 mg/MJNET.
>
>
>
> It is a pellet burner with power controllable across the range of 1 to 2.3
> kW. That is calculated on a 3 minute smoothed average. The fuel is Albasia
> Pellets which is the only type available in Central Java. The moisture
> level is 5.6%. Sometimes it is a little higher, towards 8%. In the past few
> months it has always been between 5.5 and 6%.
>
>
>
> The importance of this is not just this particular stove, it is the
> demonstration that biomass can be burned with extremely low emissions in a
> relatively inexpensive natural draft stove. Remember, this is the second
> stove seen recently that outperformed any fan stove I have seen.   Fans
> tend to stir up particles, lofting them on the high velocity air giving
> elevated PM2.5 and PM4 readings. PM4 is unusual in natural draft stoves.
>
>
>
> The oft-repeated claim that a stove needs a fan in order to be ‘really
> clean’ seems to be the old thinking now. The reduction measured against the
> baseline (burning wood, not pellets) is over 99%. At this low level we have
> to quibble over the precision. Let’s just say that after 4 minutes from
> ignition the PM level is very low.
>
>
>
> The test duration is about 80 minutes and involves replication the cooking
> behaviour in Central Java. The stove is made in Indonesia.
>
>
>
> The system efficiency (energy in the fuel loaded v.s. the energy in the
> pot) is just over 30%. The thermal efficiency (energy in the fuel
> completely combusted v.s. the energy in the pot) is just over 43%. The
> average Heat Transfer Efficiency was 44.7%, with the low power average
> being 46.5%.
>
>
>
> Just to give you a picture of CO, the CO/CO2 ratio at low power was 1.0%,
> rising with firepower. The CO/MJNET was between 3 and 4 g so it can still
> be improved.
>
>
>
> Regards
>
> Crispin in Accra with a pile of friends
>
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