Joshua Hadler wrote:
>
> Mtnman3620@aol.com wrote:
> >
> > In a message dated 8/19/99 11:36:46 AM Eastern Daylight Time,
>pfoster@gdi.net
> > writes:
> >
> > << An interesting point came up on the RX7 list - the use of pressurized
> > CO2 to cool intercoolers on grid. Are people doing this at SCCA events
> > now? Will there be people doing it in Topeka next month? >>
> >
> > Is this actually better than using ice water? I can't remember all my
> > physics and thermodynamics...
>
> I would guess that depends on what angle the intercooler is at. If
> water sprayed (or poured) onto the intercooler can get through the
> cooler core and touch all of the surfaces, that'd be a more efficient
> transfer of heat. As there are more water molecules per volume than
> there are of compressed CO2. That's what is helping bring down the temp.
> So if you have a hard to reach or awkwardly sloped intercooler, than
> perhaps a CO2 fire extinguisher is a better way to go.
Liquified CO2 at higher pressure than 1 bar is definitely colder than 32
degrees F when it expands. I used it in a QA capacitor lab to cool test
chambers to at least -55 degrees C. I don't know how low it could go...
Paul Foster
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