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- Newsgroups: sci.energy
- Path: sparky!uunet!munnari.oz.au!titan!root
- From: c.oneill@trl.oz.au (Chris O'Neill)
- Subject: Re: A Compressed-Air Car -- Possible?
- Message-ID: <1992Nov20.043820.5939@trl.oz.au>
- Sender: root@trl.oz.au (System PRIVILEGED Account)
- Organization: Telecom Australia Research Laboratories
- References: <BxIEqA.L0z@Novell.COM> <1992Nov12.002426.5219@kestrel.edu>
- Date: Fri, 20 Nov 1992 04:38:20 GMT
- Lines: 27
-
- In article <1992Nov12.002426.5219@kestrel.edu> king@reasoning.com (Dick King)
- writes:
- >In article <BxIEqA.L0z@Novell.COM> steveo@mobius (Steve Olson) writes:
- >>>According to my calculations (based on a Gast airmotor catalogue), such a
- >>>vehicle would need air tanks that could hold 100,000 psi.
- >>
- >>The nitrogen and oxygen in air liquify at a much lower pressure than
- >>100,000 psi.
- >>I think around 1200 psi. This makes it impossible to reach a higher pressure
- >>because liquids do not compress very well.
- >>
- >>Maybe your idea would work with 1000 psi. You might need a bigger tank than
- >>anticipated but 1000 psi in a 100 gal tank represents a good deal of energy.
- >
- >SCUBA tanks go well over 3000 PSI these days.
-
- 3000 psi (at least) is also the pressure used by air liquification plants, but
- the air doesn't liquefy until after it passes through the expansion valve and
- cools down sufficiently.
-
- Also, Nitrogen and Oxygen do not liquify at any pressure at room temperature.
- They just become denser and denser gasses as the pressure increases. Refer to
- a thermodynamics text.
-
- Chris O'Neill
- Telecom Australia Research Labs
-
-