home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.energy
- Path: sparky!uunet!grebyn!daily!sgs
- From: sgs@grebyn.com (Stephen G. Smith)
- Subject: Re: External-Combustion Cars -- Possible?
- Message-ID: <1992Nov15.235437.3123@grebyn.com>
- Organization: Agincourt Computing
- References: <1992Nov12.111359.11804@bsu-ucs>
- Date: Sun, 15 Nov 1992 23:54:37 GMT
- Lines: 57
-
- In article <1992Nov12.111359.11804@bsu-ucs> 01crmeyer@leo.bsuvc.bsu.edu (Craig Meyer) writes:
-
- >Could a fuel-burning, zero-emmisions vehicle be built if it were driven
- >by an external-combustion engine?
-
- > Craig Meyer 01CRMEYER@LEO.BSUVC.BSU.EDU
-
- Dunno about zero emission, but external combustion engines can be *very*
- low emitters.
-
- The two main candidates are Stirling and Rankine (steam) cycle engines.
- Both have promise, with a bit of a nod to the Stirling in terms of
- efficiency. Both have a lower Carnot efficiency than IC because the
- high temperature of the external combustion engines is the temperature
- of the working fluid, while the high temperature of the IC engine is the
- temperature if the combustion gasses.
-
- It's not clear if this means anything in practical terms. Current
- prototypes are not particularly efficient, but they are research
- machines. I'm not sure if any of them have actually been tested on the
- road.
-
- Unfortunately, US automobile manufacturers have a deep financial and
- emotional attatchment to IC engines. They're not likely to do anything.
- The Japanese? Show 'em a way to make money at it and stand back ....
-
- The "official" problem with Stirling engines is that the reenerator
- (see your friendly local library or encyclopedia for a description of
- the cycles) has to be made out of "exotic" materials. For the car
- companies, "exotic" means anything other than mild steel, cast iron,
- aluminum, or plastic.
-
- Steam is a bit stranger. The Stanley Steamer was supposedly unsafe,
- but that's not what the evidence says. Apparently, it was one heck of
- a car, "high performance" even by modern standards. However, the
- justification that "Stanleys exploded" (none ever did) is still used as
- an arguement against investigating steam.
-
- In addition, whatzisnme Lear (of the Lear Jet) got a DOE grant sometime
- in the 1970's to build a "concept steam car". He came up with a steam
- turbine driven monster that basically ended discussion on the subject.
- IMHO, he simply proved that an aerospace contracter can spend $15
- million without accomplishing anything. Not a surprise.
-
- Supposedly, there was an outfit that went bankrupt in the late 1970s or
- early 1980s (Williams Engine Company, Ambler, PA?) that made steam cars.
- Anybody have any data?
-
- Anyway, in conclusion, "external combustion" engines are a very fruitful
- area of investigation that are currently being neglected. Hopefully,
- this will change soon as car companies get squeezed by the air pollution
- regulations.
-
- --
- Steve Smith Agincourt Computing
- sgs@grebyn.com (301) 681 7395
- "Truth is stranger than fiction because fiction has to make sense."
-