home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!news.cs.indiana.edu!bsu-cs!bsu-ucs.uucp!01crmeyer
- From: 01crmeyer@leo.bsuvc.bsu.edu (Craig Meyer)
- Newsgroups: sci.energy
- Subject: Re: Continuing Steam-Car Discussion
- Message-ID: <1992Nov20.130457.12175@bsu-ucs>
- Date: 20 Nov 92 18:04:57 GMT
- References: <1992Nov17.180135.25760@kakwa.ucs.ualberta.ca> <1992Nov18.192113.12389@ke4zv.uucp> <1992Nov19.090350.12088@bsu-ucs> <1992Nov19.232350.16638@michael.apple.com>
- Organization: Ball State University, Muncie, In - Univ. Computing Svc's
- Lines: 63
-
- > This prompts me to mention: Trains in the US are often diesel/electric.
- > Why are their no hybrid trucks? I'd expect that the electric generator
- > and motor(s) would be no larger than the present (what 15 speed?)
- > transmissions and differentials.
-
- I was suprised just how big a 200hp electric motor IS! And a generator of the
- same power, too?! You bet the system would be bigger.
-
- > Why not an externally fired steam turbine driving a generator/motor set?
- > What about steam turbine/generator technology makes it unsuited to something
- > of the scale of an 18 wheel truck?
-
- Present steam turbine systems would be too big, too. That, and it's tough to
- match the efficiency of a modern turbodiesel.
-
- I just wonder if some overdue innovation in boiler technology could
- significantly reduce their size. For instance--if the boiler tubes were of
- smaller diameter and had MANY TINY fins, both on the outside AND the
- inside (so their inside cross-section would be something like an okra)
- THAT RIGHT THERE would be a great advance from the GM steam car.
-
- It's all about reducing the amount of water in the system at once. Yeah,
- flash-boilers may only have a teacup of steam going at once, but it just looks
- like A TEACUP IS TOO MUCH.
-
- We're talking tablespoons, here.
-
- Efficiency, condenser and boiler size, and start-up time are all
- improved by reducing water volume and increasing the operating
- temperature and pressure.
-
- We need boiler tubes with drastically more surface area per volume.
- Materials that can take the 800C steam and not corrode.
- A reliable oil-separation system (which GM got a head-start on).
- Advanced computer control of water, fuel, and air pumps.
-
- The following would be icing on the cake:
-
- Valvetrains allowing reverse operation.
- Establishing good efficiency at many power and speed ratings.
-
- How? By using all cylanders for acceleration and then being able to
- turn some off for low power, high-speed cruising?
-
- How? By cutting off their steam? Physically disconnecting them with
- clutches/fluid couplings? Or each of them having their own generator?
-
- If the above two goals could be reasonably reached, then it'd seem possible
- that we could eliminate the transmission altogether, yet maintain efficiency.
-
- Cars, trucks, semis and buses with no transmissions!
- Trains and ships with no generators or motors!
-
- Who wouldn't go for that?!
-
- CM
- --
- Craig Meyer 01CRMEYER@LEO.BSUVC.BSU.EDU
- Indiana Academy for Science, Mathematics, and Humaities.
- Muncie, IN 47306 317-285-7433
-
- Opinions expressed are mine alone, and not necessarily
- shared by the Indiana Academy.
-