[Digestion] Small Digester and Rankin Engine Questions

[Sam Wampler]

Nick,

Why don't you have Kevin answer the below question about a small digester.

Sam

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From: digestion-bounces at lists.bioenergylists.org [mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Randy Mott
Sent: Wednesday, January 12, 2011 2:51 AM
To: 'For Discussion of Anaerobic Digestion'
Subject: Re: [Digestion] Small Digester and Rankin Engine Questions

We don't do projects in the US, but my understanding is that 500 cows is a rule of thumb. I have some literature....

On Rankin cycle engines, we have followed it closely in Europe and the US. There is about 15% more electricity that can come from the heat exhaust of the initial generators. The capex is about 1250 Euro/kW. We don't have much incentive to do it in Poland since we sell the heat and also obtain a co-generation certificate for each MWe.

GE Jenbacher is doing some development in Europe and eventually, I believe, will be trying to offer this as an option on its generators.

Randy Mott
CEERES
Warsaw



From: digestion-bounces at lists.bioenergylists.org [mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Gould, Merrill
Sent: Tuesday, January 11, 2011 6:08 PM
To: digestion at lists.bioenergylists.org
Subject: [Digestion] Small Digester and Rankine Engine Questions

Greetings:

I have two questions I am hoping someone has answers for:

1.       Are there small farms with digesters in the United States? When I say small farm I don't mean 2-3 cows, I mean a farm with around 125 dairy cows, which is the average herd size in Michigan. If so, where are they and what has been their experience with their digester? I suspect there probably are no small farms with digesters in the US, but I would really like to know. I have had numerous inquiries from farmers with small farms in West Michigan about putting in a digester on their farm. If my assumption is correct that there are no small farms with digesters, are there farms with comparable numbers of dairy cattle with digesters outside of the United State? If so, where are they and what has their experience been with their digester?

2.       Has anyone had experience using a Rankine engine as part of an energy producing system?

Thanks in advance for any insight you can provide me.

Charles Gould
Michigan State University Extension
West Olive, Michigan

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