<div dir="ltr">Crispin:<div><br></div><div style>We have several stove designs and models not shown on our website. The SilverFire Survivor rocket stove with the exterior door has primary airflow below the combustion chamber floor and through the base of the stove. Ignore the traditional door opening. Note the 360 degree vertical primary air ports built in around and into the base of the stove. This is the origin of a large percentage of the stove ventilation. Primary air is provided through ventilation ducting below the fire and through the grate and also feeds additional secondary air holes directly below the chimney, above the flame. Think of the Survivor rocket stove as a 25% secondary air & 75% primary mix hybrid designed rocket stove. </div>
<div style><br></div><div style>We have made significant changes to the beta models we introduced at the Cambodia stove demo. The improved version we will release later this month has several new additional upgrades. Do not focus on the traditional door opening and means of ventilation, although there is a viewing slot to monitor the stove with some ventilation, the ventilation ducting is an unique design below the stove. The door is designed is to retain greater heat in the combustion chamber for more efficient combustion, improve both high & low power cooking control and improve ember safety. Dr. Larry Wininarski has provided lots of valuable suggestions for several of the new upgrades and field use has provided other insights moving forward. We will continue to improve this quality product.</div>
<div style><br></div><div style>Our TLUD designs also may confuse you too, since it may not be obvious we have ventilation provided through the back of the stove in addition to the ventilation door on the front of the stove. Our Super Dragon uses squirrel cage computer fan available anywhere in the world and has an ingenious metal plate with multi-sized orifices to direct variations of secondary or primary air. We have a larger mix of other products as well. Some of these stoves are well suited for the BOP and others would require financing of some sort, due to their higher material costs. Hopefully stove projects looking for greater durability will embrace these unique, quality patented designs. We have special humanitarian pricing for BOP projects and business development.</div>
<div style><br></div><div style>Our primary BOP SilverFire products are the Survivor rocket stove and the Hunter Chimney stove (natural draft TLUD with chimney.</div><div style><br></div><div style>Regards,</div><div style>
<br></div><div style>Todd Albi, SilverFire</div><div style><br></div><div style><img src="cid:ii_14035d3bb7f4e06a" alt="Inline image 2"><img src="cid:ii_14035d35bcdf52d9" alt="Inline image 1"></div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Wed, Jul 31, 2013 at 9:25 AM, Crispin Pemberton-Pigott <span dir="ltr"><<a href="mailto:crispinpigott@gmail.com" target="_blank">crispinpigott@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-CA" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Dear Todd<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">In this photo it appears there is a drop-down hood or door that closes off the excess primary air that would normally enter through the fuel hole.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.silverfire.us/page_10_1/silverfire-survivor" target="_blank">http://www.silverfire.us/page_10_1/silverfire-survivor</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Is there some side wall or baffle that assists this?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Do you provide secondary air through other holes inside the stove? It is mentioned but not shown.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Have you measured the typical excess air level above the combustion chamber for a typical test?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I am interested in knowing how you calculated the thermal efficiency. You mean the fire-heat to pot-heat transfer efficiency, right?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks<br>
Crispin<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">+++++++</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">Subject: Cajun Rocket Pot / TLUD Soot<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Soot is an end product on all pots used on biomass stoves with or without fins or skirts. Heat transfer is increased by adding more surface area to cooking pots with dowels, finned ribs, corrugated ribs, rows of fins or full skirted pots as discussed. Steel woks with lamented cast iron bases with fins have been available in China for quite sometime. We have both in our SilverFire showroom. They are designed specifically for biomass. Finned pots specific for LPG have also been available for a number of years.<u></u><u></u></p>
<p class="MsoNormal"> The Chinese Enron turbo pots have been marketed in the USA for several years (<a href="http://www.turbopot.com" target="_blank">www.turbopot.com</a>). Rebates for Enron finned pots are available from utility companies in the USA for LPG savings. <span style="font-family:"Verdana","sans-serif";color:#262626"> </span>The LPG fin design on Turbo pots differ significantly from the biomass design. Narrow LPG finned pot channels clog with soot and the end result is that the soot negates heat transfer, if used with biomass. Fin designs for biomass cooking are significantly wider and work well. Time to boil is significantly reduced.<u></u><u></u></p>
<p class="MsoNormal"> The ease of cleaning and product acceptance is also important, as Dale touched upon. We had early prototypes of both fin pot & skirted pots fabricated in 2008. I was not a proponent of the Aprovecho fin pot. It made no sense for the end user. The early design had fins that extended from the base and up the sidewalls of the pot. We would have had to provide tetanus shots for end users, had that design ever reached the market. The exterior design was unacceptable. Cleaning or handling the pot was a handling hazard. <u></u><u></u></p>
<p class="MsoNormal"> Our production pot we introduced to the introduced to the market was the skirted pot. It cut approximately 5 minutes to time to boil in our early WBT work. I brought the skirted pot to market though, for the important fact that we designed the skirt to protrude below the cast iron cook top. This important design feature reduced the chance of the pot sliding off the stove to prevent burning the cook or children. Since soot did not accumulate on the exterior skirt, it also meant less cleaning for the cook, compared to the finned pot. The skirted pot was more acceptable than our fin pot design. Combining a skirt and fins would provide even greater heat transfer. A well-designed pot must be easy to clean. <u></u><u></u></p>
<p class="MsoNormal"> Todd Albi, SilverFire <u></u><u></u></p></div></div></div></div><br>_______________________________________________<br>
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