<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Paul and List, cc Andrew<div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>1. I can’t find the message from Andrew Heggie that you were responding to, so hope Andrew can identify how to find it. Regardless, you have given a strong justification for not worrying about the thermal draw of a TEG. </div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>2. Following the TEG theme though a little - could one save on costs considerably if you have a simple TEG that has no battery or grid connection? One would only have power proportional to the stove thermal capabilities. You would probably still need a control circuit that lowered fan speed, if needed to get the right stove power level.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>3. My main reason for responding though is that you may be the one and only stove person who has been able to do highly technical stove development - because of the strength of Philips, as a huge and admired multinational. I have never seen your original stove up close. Also only seen the current version from afar - that being (I think) now manufactured in Africa. But I have always read/heard that you (for Philips) had designed the cleanest and most efficient stove. Thank you for all that excellent work.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>4. So I have these questions, assuming that you and Philips are out of the stove business (but hoping you/Philips still could re-enter, which would probably preclude your answering any of the following):</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>a. I remember your reporting that you personally regularly cooked so as to save the char, although that was not (I recall) advertised by Philips (rather char was to be consumed, with changes made in primary air flow to keep the power level as desired). </div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span> Was there ever any Philips study on the virtue of only producing char? (For either resale or biochar use?) </div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>b. What are your personal views of doing that (to produce a lower cost version, with income generating potential)?</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>c. Were there ever any computer simulations by Philips of the air flow and combustion details (that can be shared)? </div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>d. Any published papers, or even company documents that could help others?</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>e. Can you now tell us of any design options that you wish could have been further used in a lower cost Philips stove for easier sale in developing countries?</div><div class=""><br class=""></div><div class="">Again - really good to see your response to Andrew. I hope all is going well for you.</div><div class=""><br class=""></div><div class="">Ron</div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 1, 2016, at 6:47 AM, Sluis, Paul van der <<a href="mailto:paul.van.der.sluis@philips.com" class="">paul.van.der.sluis@philips.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Dear AJH,<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">The Philips stove does NOT use significantly more fuel because of the attachment of the TEG.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">The TEG unit takes around 100 W of heat from the fire. 98W is waste heat of the unit (2% efficiency). That 98 W is recirculated into the fire because it is used to preheat the combustion air.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">The remaining 2W is fed to the fan. In the fan 1.8W is transformed into heat (just 10% efficient). Also this 1.8W is fed back to the fire.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">So just 0.2W is actually taken from the fire. An estimated 80 % of that power is lost as pressure drop over the nozzles that feed the fire with high velocity air. That loss is gain transformed into heat that comes into the fire.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">So the real power taken is around 0.04W. That needs to be compared to the power produced: 4000W. So an estimated 1/100000th extra fuel might be required.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">The might comes from the fact that in this case the energy lost is caused by the kinetic energy of the air moving away from the fire. But even a natural draft stove has these losses.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">So it is safe to assume that with the Philips construction NO additional wood is required because of the use of a TEG.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Kind regards,<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Paul.<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><u class=""><span lang="NL" style="font-size: 24pt; font-family: Webdings; color: green;" class="">P</span></u></b><u class=""><span lang="NL" style="font-size: 10pt; font-family: Arial, sans-serif; color: blue;" class=""><span class="Apple-converted-space"> </span></span></u><span lang="EN-GB" style="font-size: 10pt; font-family: 'Comic Sans MS'; color: green;" class="">Take care of the environment, print only if necessary ...</span><span lang="EN-GB" style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><br style="font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><hr style="font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><font face="Arial" color="Gray" size="1" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">The information contained in this message may be confidential and legally protected under applicable law. 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