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<font face="Helvetica, Arial, sans-serif">Friends,<br>
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<div class="moz-cite-prefix">On 8/14/2014 2:54 PM, Big Daddy wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D">Gentlemen,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I live in the
tropics (Puerto Vallarta), and have a very keen desire to
power a refrigeration system from gas… I always assumed it
would be some sort of ammonia refrigeration system, or a
super-big version of an RV fridge. Currently, I build
charcoal retorts and charcoal gasifiers… Just haven’t had
time to dive into the refrigeration sciences yet.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Additionally,
there may be a way to use “waste heat” from a retort vs.
direct flame… I just don’t have the numbers yet, but am very
interested in this thread.</span></p>
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<br>
I am ignorant in a vast array of subjects, including the fine points
of the physics of refrigeration. That gives a context for my saying
that I have heard that absorption cycle refrigerators (ACR)-- that
is, those which are passive, using only convection to pump fluids--
are far less efficient than technologies which rely on active
pumping and/or compressors. ACRs are often quoted as having single
digit efficiencies, and further that in general it is more efficient
to generate electricity and use that to power a refrigerator;
although of course YMMV. If this is the case, then whether the
working fluid is ammonia/water or some other, and again speaking
generally, one would probably use ACR where there is no electricity,
or where there is an abundance of heat which would likely otherwise
be wasted, etc.<br>
<br>
Or use a better ACR. Interestingly, Albert Einstein shares a number
of patents directly and indirectly related to ACR technology with
Leó Szilárd (another physicist, noted as a science fiction writer),
and some say that their technologies offer better efficiencies. <br>
<br>
But the final fly in the soup is that few ACR refrigerators are
still manufactured, and as such while a discussion of the technology
may be of interest, few of us have the machine shop, the knowledge
and the skill to translate any of that into reality.<br>
<br>
<br>
<br>
d.<br>
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