[Stoves] More about concentrators.

[Crispin Pemberton-Pigott]

Dear CH4 Watchers

You may be interested in this article by one of the authors of the “1.5 Degree” report.

“A solution to the misrepresentations of CO2-equivalent emissions of short-lived climate pollutants under ambitious mitigation”

https://www.nature.com/articles/s41612-018-0026-8 by Myles Allen et al.

Hidden in the verbiage and obligatory genuflections is the fact that CH4 impact has been over-estimated by a factor of 4 due to the misrepresentation of emissions as “net’ without considering the usual fate of the material, using cattle as an example. Once the number of cattle (or stoves) stabilizes, there is no net increase in CH4 even if emissions continue to occur. A forced increase in the temperature requires an increase in the total. In accounting this is known as Double-Entry Bookkeeping where one tracks total emissions and total removals to find the net change.

Allen et al advocates the use of GWP instead of CO2e as a solution to this miscalculation. “GWP* accurately indicates the impact of emissions of both long-lived and short-lived pollutants on radiative forcing and temperatures over a wide range of timescales, including under ambitious mitigation when conventional GWPs fail.”

This change will have a strong impact on stove projects that intend to “sell” CH4 reductions as CO2e.  My recommendation is to be sure your project does not rely in “offsets” to be financially viable.

Regards
Crispin



Hi Norm;

I have not heard of any emissions testing on Dave Yarrow's nozzle TLUD combustor.

On a cookstove ND-TLUD, I will do some tuning to an internal riser ± nozzle, then send that for testing.

Remember, we have to measure CH4 as well, else TLUDs will be left out of carbon credits schemes.

Pity that we have to do all of this on our own dime.  If we had a research grant, we would have all problems solved.

Julien.

On Fri, Mar 29, 2019 at 9:10 AM Julien Winter <winter.julien at gmail.com<mailto:winter.julien at gmail.com>> wrote:
Hi Norm;

The photograph is of a double-walled TLUD with pre-heated secondary air.  The 55 gal. drum has no bottom.   The 35 gal drum is the TLUD reactor.

However, I have put the same burner on at single-walled 55 gal. TLUD, with a gap between the top of the drum and the lid supporting the burner.

Cheers,
Julien.

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