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- From: stanb@hpnmdla.sr.hp.com (Stan Bischof)
- Date: Tue, 10 Nov 1992 16:09:24 GMT
- Subject: Re: The Compressed-Air Car--Possible?
- Message-ID: <13510040@hpnmdla.sr.hp.com>
- Organization: Hewlett-Packard, Santa Rosa, CA
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!decwrl!spool.mu.edu!uwm.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!scd.hp.com!hpscdm!hplextra!hpl-opus!hpnmdla!stanb
- Newsgroups: sci.engr
- References: <1992Nov9.153449.11656@bsu-ucs>
- Lines: 31
-
- In sci.engr, rizzo@cbnewsf.cb.att.com (anthony.r.rizzo) writes:
-
- >I'm sure that it's possible to contain some fluid at 100,000 psi.
- >I'm not sure that air is still a gas at 100,000 psi, though.
- >I would have to look into the matter. It's been too long
- >since I had thermodynamics.
-
- Actually, I would think that this would be highly desirable! Think of
- how an aerosol can works- the vapor pressure of the liquid propellant
- maintains a reasonably constant pressure inside the can. Hence a
- tank of liquid air would provide not only much more air than
- a tank of compressed air, but would also provide pretty much even
- pressure to power the hypothetical car.
-
- questions: what pressure would be needed to keep air liquid at room
- temp (or for that matter at say 50-60C to account for parking the
- car in the hot sun without the tank doing nasty things)?
-
- What amount of usable energy could be stored this way, taking the
- efficiencies of the system into account?
-
- How do you keep the liquid air from fractionating, or if it does do so,
- how do you deal with the effects of this? Or would you want to do this
- with nitrogen rather than air?
-
- I suspect very low energy density and very heavy tanks.
-
- Aynone have some numbers handy?
-
- Stan Bischof
- HPSR
-