--- David Weinshenker <daze39@eart...> wrote:

> We've considered it, but it looks like the required
> quantities
> of LN2 would be awkwardly large... especially now
> that I'm getting
> down to the desired temperatures with mechanical
> refrigeration.
> (A domestic freezer won't reach -40 to -60 F, but
> this temperature
> range is within the capabilities of commercial
> compressors.)

This should probably be looked at as an exercise in
thermodynamics, but still might be interesting.

It's known that air cools, when released from a highly
pressurized volume. Say, today you can reasonably easy
get air compressed to 200-300 bars.

The question is, how much the air can cool when
expanding from 300 bars to 1 bar, starting from normal
(300K) temperature?

Which model should be most appropriate here?

Alexander

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