[Digestion] Small water-cooled gensets

[Anand Karve]

Dear Prof. Chanakya,
congratulations!
Yours
A.D.Karve

On Sun, Oct 21, 2012 at 12:15 AM, Hoysall Chanakya <
chanakya at astra.iisc.ernet.in> wrote:

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


-- 
***
Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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