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<p class=MsoNormal>Dear Tom,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’d be very happy to present the case against the WBT at
ETHOS.<o:p></o:p></p>
<p class=MsoNormal>But as you know, I live in France, and I was not planning to
go to the U.S. As I said to Elisa, I am more than willing to come, if ETHOS is
able to pay for the trip.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have other things to do in France at the end of January.
So I am not sure I want to travel on my own budget to the U.S. only to say what
I have been already saying for, not 18 months, but more like 12 months. It’s
been much more for Crispin, Philip, and others. <o:p></o:p></p>
<p class=MsoNormal>I am already spending my own time, for free, on this
initiative. I haven’t resolved myself to start spending my own money on it,
just to repeat what has been said so many times.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Tom, you say « WBT sponsors ». Do you mean WBT
supporters?<o:p></o:p></p>
<p class=MsoNormal>If it is supporters, I asked many times on this list and ask
again: who are they?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>As Philip says, no one has been willing to discuss the WBT
issues for years, on, or off-list.<o:p></o:p></p>
<p class=MsoNormal>If we want the largest number of people to benefit from
constructive discussion, the Bioenergylist is the best place for that.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Why should I have to take the plane, travel a total of 16 000
km to go and meet in person the WBT supporters, at their home, to repeat to
them exactly the same things I have been repeating for months, things that they
have known for years? When they haven’t even read the studies about the WBT,
nor the alternative protocols?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>This was another thing I was trying to convey to Elisa. Testing
related issues don’t have to be discussed at ETHOS, nor in the TC 285 for that
matter, to start to exist in the realm of stoves. There are important efforts
being done, that are not necessarily being talked about at ETHOS. There are
people working on stoves, who are not going at ETHOS.<o:p></o:p></p>
<p class=MsoNormal>ETHOS shouldn’t be the institution that validates and
officialize what is important, and what is not.<o:p></o:p></p>
<p class=MsoNormal>Important matters shouldn’t have to wait to be presented at
ETHOS, to be carefully studied by the parties involved in stove testing.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i>« WBT sponsors likely won’t answer questions unless
pressed to do so with a clear demonstration of need. »<o:p></o:p></i></p>
<p class=MsoNormal>Then maybe I should copy again the summary of what are the
WBT issues:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-align:justify'><i><span style='font-size:12.0pt;
color:black'>« Some of WBT critical issues remain unsolved. In particular,
the main weakness of the WBT concerns its real-life relevance. […]
Criticism about WBT concerns also the repeatability of the protocol, with a
number of researchers claiming that it would need to be reviewed in terms of
accuracy. […] As a matter of fact, uncertainties related to temperature reading
and vaporisation in the boiling region lead to high variability between test
replicates.<o:p></o:p></span></i></p>
<p class=MsoNormal style='text-align:justify'><i><span style='font-size:12.0pt;
color:black'>A lot of debate has been made around formulation of metrics,
primarily on thermal efficiency, which is often interpreted as the most
immediate and distinctive stove performance parameter. Studies from Bailis et
al. highlighted how relying on WBT thermal efficiency outputs, regardless of the
relative importance of high and low power cooking tasks among the target
population, can lead to misleading interpretations. Furthermore, Zhang et al.
and Jetter et al. questioned the scientific meaningfulness of thermal
efficiency at simmering. <o:p></o:p></span></i></p>
<p class=MsoNormal style='text-align:justify'><i><span style='font-size:12.0pt;
color:black'>Finally, some unsolved issues concerning statistical significance
of data are worth mentioning. WBT 4.2.3 includes “Statistic Lessons for
Performance Testing”. The appendix specifies that the minimum number of test
replicates for each model of stove should be three, […] Wang et al.
investigated this topic using a simplified version of the WBT 3.0 and
demonstrated that more than 5 replicates are likely to be required to avoid
impractically large 95% confidence intervals and that even more replicates may
be required to demonstrate a statistically significant difference in
performance between two or more stoves. »<o:p></o:p></span></i></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>What in this demonstration of need is not clear?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>There might be an option. I put Elisa in copy. That would be
great if I could do a short presentation at ETHOS, by video conference, about
the WBT issues, from Paris. Then it can be followed by a discussion.<o:p></o:p></p>
<p class=MsoNormal>That would be a great way to have this discussion.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Tom, Elisa, what do you think?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Best,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Xavier<o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De :</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Stoves
[mailto:stoves-bounces@lists.bioenergylists.org] <b>De la part de</b> Tom Miles<br>
<b>Envoyé :</b> samedi 13 janvier 2018 04:50<br>
<b>À :</b> 'Discussion of biomass cooking stoves'<br>
<b>Objet :</b> Re: [Stoves] WBT disagrements<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><a name="_MailEndCompose"><span lang=EN-US>If challenging
the WBT is so important why not discuss it with your peers? The purpose of
ETHOS is to have a conversation about these issues.</span></a><span lang=EN-US>
After 18 months of criticism of the WBT on this list I expected to see a
presentation with a scientific comparison of stove test methods. I don’t see
one on the agenda. Are none of the WBT critics going to ETHOS? <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><a
href="http://www.ethoscon.com/ethos-2018-agenda/">http://www.ethoscon.com/ethos-2018-agenda/</a><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Tom<span style='color:#1F497D'><o:p></o:p></span></span></p>
</div>
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