[Stoves] Stove identification please

Tue Mar 10 13:41:36 CDT 2020

Dear Andrew

I used this:
http://catalog.cleancookstoves.org/stoves/268

[cid:image003.jpg at 01D5F6E9.FC7D7170]

It looks right.  Maybe someone copied it incorrectly to another place.

I just went through the metrics reported there and there are several very strange things.  Some of the numbers don’t balance with each other, and it is using the IWA which has no valid low power metrics.

One very strange thing is that the CO2 emission rate drops 24% per kg when changing from high to low power. This can only happen if the CO goes through the roof, or if it is not burning the fuel.   The CO drops 18% so that can’t be where the carbon is going.

Because the char energy (~2.1 MJ) is subtracted from the fuel before assessing the fuel consumption, we have no idea what the thermal efficiency is.  Using the other numbers given and some guesses, it might be 37% at high power. Tier 3.  The value listed is Tier 4 but the rating shown is Tier 3  - no explanation.

Note to those new to this, any metric with “per litre” at the end is not a valid unit.
[cid:image005.jpg at 01D5F6E9.FC7D7170]
What is happening is the (valid) PM or CO number is divided by however many litres remain in the pot, in other words, by a random number.  It has been recognized since at least 1982 (Feu de Bois) that there is no valid metric for the thermal “efficiency of simmering”.

Most of this was addressed during the ISO exercise, however at the last minute the WBT and CCT-2.0 appear in the Scope of the Voluntary Performance Standard document ISO 19867-3, as if they are validated test methods.

“The best way to assess real-world impacts of a stove intervention or program is through field studies – see ISO CD 19869, Clean cookstoves and clean cooking solutions – Guidance on field testing methods for cookstoves [2], as well as other methods such as the Controlled Cooking Test, the Kitchen Performance Test, or the Uncontrolled Cooking Test [6]."

Never assume anything.  No working group reviewed or accepted the validity of these legacy test methods. The CCT is mentioned 5 times in the ISO 19869 Field Test document. The KPT is mentioned and references a new version KPT-4.0<https://www.cleancookingalliance.org/binary-data/DOCUMENT/file/000/000/604-1.pdf> which was also not reviewed.  Because it is incomplete as a method, it references the old KPT-2.0.  The new version still references the old WBT and CCT as if they are validated protocols.

The zombie tests continue to rise from the dark of night.

Regards
Crispin

From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of ajheggie at gmail.com
Sent: Tuesday, March 10, 2020 13:45
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] Stove identification please

On Tue, 10 Mar 2020 at 16:07, Crispin Pemberton-Pigott <crispinpigott at outlook.com<mailto:crispinpigott at outlook.com>> wrote:
Thanks you for that,  It confirms my bias:

ACE-1 from African Clean Energy in Maseru.

looking at the website given by woodstoves56 under the performance tab it gives

PM emissions (g/MJ delivered to pot)
101.1

Surely they mean milligrams per MJ?

Andrew
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