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Stephen,<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/8/2013 2:37 AM, Stephen Etheridge
wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Why
not use a gas fridge?</span></p>
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<br>
One's mileage may vary, but gas refrigerators (here in the US, such
as the old Servels) have very poor efficiency (3%?), and generally
speaking, where enough biogas is available, it makes better sense to
make electricity, use the excess heat for the digester, and use
electric-powered cooling.<br>
<br>
I don't know if larger cooling systems would experience
significantly better efficiency: indeed, I don't know that I have
ever seen mention of a larger system, which may provide something of
an inferential answer. (By the way, Einstein held a patent on a
gas-powered refrigeration system.)<br>
<br>
<br>
<br>
d.<br>
<div class="moz-signature">-- <br>
<div style="font:Georgia" ;=""><span style="font-size:110%;">David
William House<br>
</span>
<div style="padding-left:3em;font-size:80%;">"The Complete
Biogas Handbook" <code><a href="www.completebiogas.com">www.completebiogas.com</a></code><br>
<em>Vahid Biogas</em>, an alternative energy consultancy <code><a
href="www.vahidbiogas.com">www.vahidbiogas.com</a><br>
<br>
</code></div>
<code>
<div style="padding-left:2em;">"Make no search for water.
But find thirst,<br>
And water from the very ground will burst."
<div style="padding-left:2em;font-size:80%;">(Rumi, a
Persian mystic poet, quoted in <em>Delight of Hearts</em>,
p. 77) <br>
<br>
<a class="moz-txt-link-freetext" href="http://bahai.us/">http://bahai.us/</a></div>
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