If you look closer at the technology you will find that the working
fluid is helium. In a Stirling machine this is an excellent choice.
The CO2 is only in a secondary circuit to transport heat from the
refrigerated area to the Stirling cooler and is not used in the
stirlig engine itself..

"RJK" == Richard J Kinch writes:

RJK Jeff writes:
It looks like you can't read - the spec sheet says "Average current
consumption for 12 VDC systems over 24-hour period"

RJK I explained why the spec you quote is stupid, because current is not
RJK measured in amp-hours. You haven't grasped that.

Peltier technology certainly works and has it place. Are you claiming
that's a hoax also?

RJK It was touted for many applications that an engineer could easily see
RJK were futile. To the extent it was promoted to the public that couldn't
RJK so easily see the futility, yes, it was a hoax.

RJK Yes, CO2 is a refrigerant and you can build a refrigerator based on it.
RJK What you can't do is build a CO2 refrigerator that works as well as,
RJK say, an R-134a unit. If you were to genuinely engineer improvements in
RJK CO2 refrigeration that made it less ridiculous, then those same
RJK improvements would make R-134a systems that much better, too. This is
RJK because R-134a is an inherently better phase-change refrigerant in all
RJK its material properties than CO2.

RJK It's like the banned R-12 vs R-134a. R-12 is always the better choice,
RJK in terms of engineering. The substitution was made for reasons other
RJK than engineering. To the extent CO2 is used, it is essentially the same
RJK process, substituting an inferior refrigerant for political reasons, not
RJK because it is anywhere as good as what it replaced.

RJK You can make a phase-change heat pump out of any condensible gas. Few
RJK such materials make a good heat pump.

--
C++: The power, elegance and simplicity of a hand grenade.