<div>Dear Prof. Chanakya,</div>
<div>congratulations!</div>
<div>Yours</div>
<div>A.D.Karve<br><br></div>
<div class="gmail_quote">On Sun, Oct 21, 2012 at 12:15 AM, Hoysall Chanakya <span dir="ltr"><<a href="mailto:chanakya@astra.iisc.ernet.in" target="_blank">chanakya@astra.iisc.ernet.in</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">Dear List users<br>At this small end of the scale it is best today to adapt motorcycle<br>engines to 100% biogas [biogas start and biogas run] systems. Modern<br>
motorcycle engines are highly tuned and have multiple spark plugs and<br>carburettion /ignition advance can be controlled through various software<br>based engine control units (ECUs]. Therefore one can get<br>biogas-2-electricity efficiencies upwards of 20-22% i.e. getting<br>
1.42-1.5kWh electrical per standard cubic metre of biogas. This is<br>something unheard of at this end of the scale.<br><br>Earlier we did modify the older petrol-start kerosene-run Honda /Yamaha<br>/Villiers engines for this purpose. The compression ratios of these<br>
engines have been kept low to avoid knocking [4.5 to 5 for running with<br>kerosene] and so the energy efficiency comes down to about 6-8.5%<br>(requiring about 1.8-3 cu.m biogas per kWh). Therefore if you have the<br>wherewithal and required skills then it would be better to take up a 100<br>
-125cc modern motorcycle engine and get a high efficiency even at<br>compression ratio of 9 [instead of the ideal 13] and compensating the low<br>flame velocity by alternative methods of firing such as multiple spark<br>plugs, etc. which these engines anyway allow in their software. They can<br>
also be tuned for lean burn enormously increasing efficiencies at low<br>loading!!<br><br>Just for the record<br>We did just filed a patent and got a company to agree for mass manufacture.<br>You could ask "Race Dynamics" for engines of this kind<br>
happy hunting<br>Chanakya<br>
<div>
<div class="h5"><br><br><br><br>><br>><br>> Dear friends,<br>><br>><br>> I am looking for advice/information on very small (5-10 kW)<br>> water-cooled gensets suitable for being fueled by biogas. Prefer<br>
> US-based options, but any information would help.<br>><br>><br>> d.<br>><br>> _______________________________________________<br>> Digestion mailing list<br>><br>> to Send a Message to the list, use the email address<br>
> <a href="mailto:Digestion@bioenergylists.org">Digestion@bioenergylists.org</a><br>><br>> to UNSUBSCRIBE or Change your List Settings use the web page<br>> <a href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</a><br>
><br>> for more information about digestion, see<br>> Beginner's Guide to Biogas<br>> <a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>> and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
><br>><br></div></div>> --<br>> This message has been scanned for viruses and<br>> dangerous content by MailScanner, and is<br>> believed to be clean.<br>><br>><br><span class="HOEnZb"><font color="#888888"><br>
<br>--<br>Dr. Hoysall Chanakya<br>Centre for Sustainable Technologies<br>(Assoc. Faculty at Centre for Infrastructure, Sustainable Transport and<br>Urban Planning (CiSTUP) and Centre for Contemporary Studies)<br>Indian Institute of Science, Bangalore 560 012<br>
ph 91-80-2293 3046; fax-91 80 2360 0683<br><br><br>--<br>This message has been scanned for viruses and<br>dangerous content by MailScanner, and is<br>believed to be clean.<br></font></span>
<div class="HOEnZb">
<div class="h5"><br><br>_______________________________________________<br>Digestion mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:Digestion@bioenergylists.org">Digestion@bioenergylists.org</a><br>
<br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</a><br>
<br>for more information about digestion, see<br>Beginner's Guide to Biogas<br><a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
<br></div></div></blockquote></div><br><br clear="all"><br>-- <br>***<br>Dr. A.D. Karve<br>Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)<br><br><br>