<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
@font-face
{font-family:Georgia;
panose-1:2 4 5 2 5 4 5 2 3 3;}
@font-face
{font-family:AdvOT77db9845;
panose-1:0 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:AdvOT77db9845+fb;
panose-1:0 0 0 0 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
color:black;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";
color:black;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
color:black;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;
color:black;}
span.apple-tab-span
{mso-style-name:apple-tab-span;}
span.apple-converted-space
{mso-style-name:apple-converted-space;}
span.EmailStyle22
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body bgcolor="white" lang="EN-CA" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">Dear Friends<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">I just finished reading the paper. I believe they have published some results before on this stove. It look very familiar. This is a cite from the conclusion:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="color:windowtext;mso-fareast-language:EN-US">“</span><span style="font-size:10.0pt;font-family:"AdvOT77db9845",serif;color:windowtext">Our results suggest that valuable engineering insights<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"AdvOT77db9845",serif;color:windowtext">are gained in the early stages of stove design through<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"AdvOT77db9845",serif;color:windowtext">targeted
</span><span style="font-size:10.0pt;font-family:AdvOT77db9845+fb;color:windowtext">fi</span><span style="font-size:10.0pt;font-family:"AdvOT77db9845",serif;color:windowtext">eld-based data collection that yield information<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"AdvOT77db9845",serif;color:windowtext">unattainable in the laboratory.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">They have done a number of interesting things technically, and proved once again to my satisfaction that the WBT and the IWA tiers are not appropriate for evaluation performance
during the development of a stove product. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">The claimed performance improvement is based on WBT numbers, but when comparing the prediction of improvement with that realised in the field, there was a large gap. The quote says
they got information from the field that was ‘unobtainable in the laboratory’. But they did not attempt to get such information in the lab. They used the WBT in the lab and much more realistic testing in the field. Who would expect them to align? The Tier
performance claims should have been based on the field tests, or a lab-based replication of field behaviour.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">An “advantage” for the test results is that as the stove produces basically no char, the impact of the skewing of efficiency numbers by mis-calculations in the WBT spreadsheet is
minimised. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">In order to improve the iterative development process the team should capture typical use patterns and develop a mixed cycle pattern to use in the lab so the number and seriousness
of problems identified in the field are minimised to the extent possible. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">The path they took is classic: Build a stove, test it using the WBT, get ‘answers’, take it to the field to find out that the WBT doesn’t predict performance very well, go back to
the lab, modify the stove based on field experience, test using the WBT again, then go back to the field.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">If they had used the typical operating behaviours observed in the field as their lab test sequence, and used the same calculations in the lab as they used in the field, the lab results
would have been far closer to the field results. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">While they have referenced the WBT as the one mentioned in the IWA 2012:11, they did not mentioned in the text which version of the WBT they used. They cite v 4.2.3 in the references.
There are at least three versions of WBT 4.1.2 referenced in the IWA giving different results for efficiency and CO (etc), and several iterations have been released since. My caution is that they reference a number of articles published produced earlier versions
of the WBT so the performance numbers are not directly comparable.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">This does not affect their own work in-house, but it does affect any comparisons made to other published work and performance comparisons (particularly for efficiency metrics).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">I compliment the approach taken in the development of the stove – getting user input and an iterative design process – as well as having no fear of using modern components to produce
an appreciated user experience.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">Best wishes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US">Crispin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="color:windowtext">From:</span></b><span lang="EN-US" style="color:windowtext"> Stoves [mailto:stoves-bounces@lists.bioenergylists.org]
<b>On Behalf Of </b>Paul Anderson<br>
<b>Sent:</b> 29-Nov-17 11:05<br>
<b>To:</b> Discussion of biomass cooking stoves <stoves@lists.bioenergylists.org>; Tom Miles <tmiles@trmiles.com>; xyang@tsinghua.edu.cn<br>
<b>Subject:</b> Re: [Stoves] A user-centered, iterative engineering approach for advanced biomass cookstove design and development<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Ron,<br>
<br>
Not correct. The stove type was not TLUD. It was essentially a trickle-feed forced air pellet heater (as in the home heating units) but made at the size of a cooking stove. Nice work, but not a TLUD and no real chance to make charcoal because the pellets
are burned to ash under the streams of forced air. It might become very successful. Good approach to designing changes. But also heavy and expensive compared to the TLUD stoves that are currently having great success in West Bengal.<br>
<br>
Paul<br>
<br>
<o:p></o:p></p>
<pre>Doc / Dr TLUD / Prof. Paul S. Anderson, PhD<o:p></o:p></pre>
<pre>Email: <a href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a><o:p></o:p></pre>
<pre>Skype: paultlud Phone: +1-309-452-7072<o:p></o:p></pre>
<pre>Website: <a href="https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.drtlud.com&data=02%7C01%7Ccrispinpigott%40outlook.com%7C3a581c946f7b4906128b08d537436c4c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636475685073265784&sdata=%2FskTy251zgXrOsnkVgBdxgZnAjF%2FQbP4eJ5pZOaTJvU%3D&reserved=0">www.drtlud.com</a><o:p></o:p></pre>
<div>
<p class="MsoNormal">On 11/29/2017 9:18 AM, Ronal W. Larson wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Tom and list: (adding designated author)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span class="apple-tab-span"> </span>Thanks. A well done article. Quite favorable on TLUDS. Main surprise was that they never use the word “charcoal”. I think they would see even better user acceptance if char (for
sale or biochar use) was an objective. The authors must not know of this list.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">Ron <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">On Nov 28, 2017, at 11:29 PM, Tom Miles <<a href="mailto:tmiles@trmiles.com">tmiles@trmiles.com</a>> wrote:<o:p></o:p></p>
</div>
<div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif">A user-centered, iterative engineering approach for advanced biomass cookstove design and development -<span class="apple-converted-space"> </span><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1088%2F1748-9326%2Faa804f&data=02%7C01%7Ccrispinpigott%40outlook.com%7C3a581c946f7b4906128b08d537436c4c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636475685073265784&sdata=2UbhLmt%2BS%2B1Gf8SsCnzJmSSJ2%2FAcqVeK6VND2PPe7ro%3D&reserved=0"><span style="color:purple">https://doi.org/10.1088/1748-9326/aa804f</span></a><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN" style="font-size:15.0pt;font-family:"Arial",sans-serif;color:#333333">Abstract</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Georgia",serif;color:#333333">Unclean combustion of solid fuel for cooking and other household energy needs leads to severe household air pollution and adverse health impacts in adults
and children. Replacing traditional solid fuel stoves with high efficiency, low-polluting semi-gasifier stoves can potentially contribute to addressing this global problem. The success of semi-gasifier cookstove implementation initiatives depends not only
on the technical performance and safety of the stove, but also the compatibility of the stove design with local cooking practices, the needs and preferences of stove users, and community economic structures. Many past stove design initiatives have failed to
address one or more of these dimensions during the design process, resulting in failure of stoves to achieve long-term, exclusive use and market penetration. This study presents a user-centered, iterative engineering design approach to developing a semi-gasifier
biomass cookstove for rural Chinese homes. Our approach places equal emphasis on stove performance and meeting the preferences of individuals most likely to adopt the clean stove technology. Five stove prototypes were iteratively developed following energy
market and policy evaluation, laboratory and field evaluations of stove performance and user experience, and direct interactions with stove users. The most current stove prototype achieved high performance in the field on thermal efficiency (ISO Tier 3) and
pollutant emissions (ISO Tier 4), and was received favorably by rural households in the Sichuan province of Southwest China. Among household cooks receiving the final prototype of the intervention stove, 88% reported lighting and using it at least once. At
five months post-intervention, the semi-gasifier stoves were used at least once on an average of 68% [95% CI: 43, 93] of days. Our proposed design strategy can be applied to other stove development initiatives in China and other countries.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN" style="font-size:13.5pt;font-family:"Helvetica",sans-serif"> </span><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif">_______________________________________________<br>
Stoves mailing list<br>
<br>
to Send a Message to the list, use the email address<br>
<a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a><br>
<br>
to UNSUBSCRIBE or Change your List Settings use the web page<br>
</span><a href="https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.bioenergylists.org%2Fmailman%2Flistinfo%2Fstoves_lists.bioenergylists.org&data=02%7C01%7Ccrispinpigott%40outlook.com%7C3a581c946f7b4906128b08d537436c4c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636475685073265784&sdata=5ZTyM9jTJxqhi6qKb8e06qVy4g1rQB4XDWfv%2BCLczvc%3D&reserved=0"><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif;color:purple">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</span></a><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif"><br>
<br>
for more Biomass Cooking Stoves, News and Information see our web site:<br>
</span><a href="https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstoves.bioenergylists.org%2F&data=02%7C01%7Ccrispinpigott%40outlook.com%7C3a581c946f7b4906128b08d537436c4c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636475685073265784&sdata=ukaTnH4016t8yxK%2B0HzR19jVVMEd0SaVxf6%2Fvx%2FCBX0%3D&reserved=0"><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif;color:purple">http://stoves.bioenergylists.org/</span></a><o:p></o:p></p>
</div>
</blockquote>
</div>
<p class="MsoNormal"><br>
<br>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Stoves mailing list<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>to Send a Message to the list, use the email address<o:p></o:p></pre>
<pre><a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>to UNSUBSCRIBE or Change your List Settings use the web page<o:p></o:p></pre>
<pre><a href="https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.bioenergylists.org%2Fmailman%2Flistinfo%2Fstoves_lists.bioenergylists.org&data=02%7C01%7Ccrispinpigott%40outlook.com%7C3a581c946f7b4906128b08d537436c4c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636475685073265784&sdata=5ZTyM9jTJxqhi6qKb8e06qVy4g1rQB4XDWfv%2BCLczvc%3D&reserved=0">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>for more Biomass Cooking Stoves, News and Information see our web site:<o:p></o:p></pre>
<pre><a href="https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstoves.bioenergylists.org%2F&data=02%7C01%7Ccrispinpigott%40outlook.com%7C3a581c946f7b4906128b08d537436c4c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636475685073265784&sdata=ukaTnH4016t8yxK%2B0HzR19jVVMEd0SaVxf6%2Fvx%2FCBX0%3D&reserved=0">http://stoves.bioenergylists.org/</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
</blockquote>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>