[Stoves] Another high performance stove located

alex english aenglish444 at gmail.com
Tue Nov 10 05:53:27 CST 2015


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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