home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!elroy.jpl.nasa.gov!sdd.hp.com!news.cs.indiana.edu!bsu-cs!bsu-ucs.uucp!01crmeyer
- From: 01crmeyer@leo.bsuvc.bsu.edu (Craig Meyer)
- Newsgroups: sci.energy
- Subject: Re: steam electric hybrid ...
- Message-ID: <1992Nov23.124242.12259@bsu-ucs>
- Date: 23 Nov 92 17:42:42 GMT
- References: <1992Nov20.182634.18984@michael.apple.com>
- Organization: Ball State University, Muncie, In - Univ. Computing Svc's
- Lines: 69
-
-
- > How big would a steam turbine and generator be for, say 10-15 kW?
- >
- > I would expect it to be far smaller than the mass of batteries
- > it would replace in a pure electric car.
-
- It's the boiler that takes up the most space, not the turbine.
-
- > So where are the technological 'gotchas'?
- >
- > Complexity?
-
- You bet it'd be comlex, in order to even match the efficiency of an IC. Sure,
- we could make a simple, big one like the GM SE 101 (which was pretty darn
- complex in itself, mind you), but that woulnd't be as efficient as an IC.
-
- > I can't quite see how a simple steam turbine/generator with
- > flash boiler for 10 kW could be any more complex than a modern IC engine
- > with turbo & intercooler & smog gear & ...
-
- You're right there, though.
-
- > Heck, wasn't the Tesla design
- > for a turbine just recently reserected by someone in a new and improved
- > form? (It was, basically, a set of disks on a shaft with steam spiraling
- > radially between the rotating disks. Very simple...).
-
- Whoa, hyah!
-
- I read about those things a year ago, too. But since it recieved so little
- attention, I guessed that it wasn't very efficient. 'Just couldn't believe
- that it'd work, I guess.
-
- Please do tell, WHAT'S THE SCOOP ON THE TESLA TURBINE?!
-
- > Efficiency? Fuel being burned external to the boiler will burn cleaner,
- > but do you loose too much energy in the boiler/turbine/generator/motor,
- > and occasionally battery charge/discharge, cycle?
-
- All depends on the operating temperature, it seems. You know--Carnot and all.
- Getting the temp up there will take some work, though. But hey, work happens.
-
- > Given that commercial power steam plants can get to very high efficiencies
- > I have trouble believing that this is a killer... but maybe it would
- > cost too much to make small plant that efficient?
-
- That's my guess. The central station turbines have DOZENS of stages--thousands
- of buckets (blades)
-
- > The idea of an external combustion generator onboard an electric
- > hybrid solves a bunch of problems (low smog, lighter weight than
- > an all-electric, good acceleration from batteries, good efficiency
- > from turbine, long range on fuel, all-electric mode for short trips, etc.)
- > so where does it fall down?
-
- Well, just how practical is the hybrid concept at all, anyway? Knee-jerk
- engineering tells me that the added complexity and cost of a fuel-driven
- prime mover AND an electrical system makes it all look silly!
-
- If the steam system is clean and efficient, why bother with the batteries?
- (I know this a pretty juvenile question, but I'd appreciate the advantages of
- hybrid systems laid out in from of me.)
-
- 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.
-