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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width="100%" style='width:100.0%;background:#F9F9F9'><tr><td style='padding:0in 0in 0in 0in'><div align=center><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=640 style='width:480.0pt'><tr><td valign=top style='border:solid #505050 1.0pt;border-bottom:none;padding:0in 0in 0in 0in'><p class=MsoNormal><a href="http://www.aprovecho.org/"><span style='text-decoration:none'><img border=0 width="100%" id="_x0000_i1026" src="http://aprovecho.org/wp-content/uploads/2020/09/enews_header.png" alt="E-news from Aprovecho Research Center"></span></a><o:p></o:p></p></td></tr><tr><td valign=top style='border-top:none;border-left:solid #505050 1.0pt;border-bottom:none;border-right:solid #505050 1.0pt;background:white;padding:11.25pt 15.0pt 3.75pt 22.5pt'><h1 style='mso-margin-top-alt:7.5pt;margin-right:0in;margin-bottom:11.25pt;margin-left:0in'><span style='font-size:21.0pt;font-family:"Arial",sans-serif;color:#213B19'>A New Edition of "Clean Burning Biomass Cookstoves"<o:p></o:p></span></h1></td></tr><tr><td valign=top style='border-top:none;border-left:solid #505050 1.0pt;border-bottom:none;border-right:solid #505050 1.0pt;background:white;padding:0in 22.5pt 7.5pt 22.5pt'><p class=MsoNormal style='line-height:16.5pt'><span style='color:black'><a href="http://aprovecho.org/?paybox_id=145"><span style='font-size:12.0pt;font-family:"Arial",sans-serif;text-decoration:none'><img border=0 width=581 height=752 style='width:6.0541in;height:7.8333in' id="_x0000_i1025" src="http://aprovecho.org/wp-content/uploads/2021/02/2.9.21-book-cover-EPA-sm.jpg" alt="cover of Clean Burning Biomass Cookstoves 2nd Edition"></span></a></span><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'><o:p></o:p></span></p><p style='line-height:16.5pt'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>If stoves pollute in the lab, they certainly will in the field. We estimate at least 3 times more. Commercially available biomass cookstoves that meet World Health Organization standards are very rare. ARC continues to be committed to doing research and development to help to get the needed new stoves to market so that field studies will show success in sales, protecting health, saving wood, and making cooks happy. We believe that sharing what we learn is very important! So, we updated our “textbook” and it’s available for free <a href="http://aprovecho.org/?paybox_id=145"><strong><span style='font-family:"Arial",sans-serif'>here</span></strong></a>. The chapters have been updated and rewritten to try and share everything that we have learned in the lab in the last five years.<o:p></o:p></span></p><p style='line-height:16.5pt'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>Enjoy!<o:p></o:p></span></p><p style='line-height:16.5pt'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>Here are some highlights:<o:p></o:p></span></p><ul type=disc><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:16.5pt;mso-list:l0 level1 lfo1'><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>With clean outdoor air, doubling the air exchange rate halves the concentrations of PM and CO in the kitchen.<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:16.5pt;mso-list:l0 level1 lfo1'><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>Using an EPA model of Oakridge, Oregon, the outdoor air concentration of PM2.5 would only be increased from 13.1 μg/m3 to 13.3 μg/m3 if homeowners used an ISO Tier 4 PM2.5 cooking stove.<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:16.5pt;mso-list:l0 level1 lfo1'><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>A catalytic converter works well with gases (30-95% reduction of CO) but not with smoke (30-40% reduction of PM2.5) (Hukkanen et al., 2012).<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:16.5pt;mso-list:l0 level1 lfo1'><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>We think that the Harris TLUD is perhaps the first "close to optimal" cookstove. It scored 0.7mg/minute PM2.5 with pellets at Lawrence Berkeley National Laboratory. It has a 3 to 1 turn down ratio. Large natural draft static mixers create thorough mixing. Decreasing primary air reduces the rate of reactions (production of wood gas) if the air/fuel mixture becomes too rich. A stationary fan blade spins the flame for longer dwell time. And cooks at ARC love to use it.<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:16.5pt;mso-list:l0 level1 lfo1'><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>When carefully tested at ARC, the SSM Jet-Flame in the CQC earthen stove scored Tier 4 for thermal efficiency, CO, and PM2.5.<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:16.5pt;mso-list:l0 level1 lfo1'><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>Renewably harvested biomass can be a carbon neutral energy source when burned very cleanly.<o:p></o:p></span></li></ul><p style='line-height:16.5pt'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>We are getting closer to practical solutions! The ones we know about are in the book.<o:p></o:p></span></p><p style='line-height:16.5pt'><i><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>Find the newly published 2nd edition of "Clean Burning Biomass Cookstoves," resources, publications and information about our work at <a href="http://www.aprovecho.org">aprovecho.org</a>.</span></i><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'> <o:p></o:p></span></p></td></tr><tr><td valign=top style='border:solid #505050 1.0pt;border-top:none;background:#EEE4CB;padding:7.5pt 11.25pt 22.5pt 11.25pt'><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:#505050'>Find archived newsletters online at <a href="http://aprovecho.org/newsletters/">aprovecho.org/newsletters</a><br>© 2021 Aprovecho Research Center/Advanced Studies in Appropriate Technology<br>76132 Blue Mountain School Road, PO Box 1175, Cottage Grove, Oregon, 97424 - USA<br>(541) 767-0287 • <a href="http://www.aprovecho.org">www.aprovecho.org</a><o:p></o:p></span></p></td></tr></table></div></td></tr></table><p class=MsoNormal><span style='color:black'>-- </span><br>Please consider making a donation to Aprovecho Research Center if you have enjoyed this content: www.aprovecho.org/donate<br>--- <br>.<o:p></o:p></p></div></body></html>