home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!elroy.jpl.nasa.gov!nntp-server.caltech.edu!SOL1.GPS.CALTECH.EDU!CARL
- From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
- Newsgroups: sci.energy
- Subject: Re: Electric Vehicle
- Date: 21 Dec 1992 08:40:59 GMT
- Organization: HST Wide Field/Planetary Camera
- Lines: 29
- Distribution: world
- Message-ID: <1h3vurINNn2j@gap.caltech.edu>
- References: <4890.1017.uupcb@spacebbs.com>
- Reply-To: carl@SOL1.GPS.CALTECH.EDU
- NNTP-Posting-Host: sol1.gps.caltech.edu
-
- In article <4890.1017.uupcb@spacebbs.com>, howard.smith@spacebbs.com (Howard Smith) writes:
- >GC>Well I screwed this up royally, let's try again.
- >
- >GC>A pound of gas has 118,000 BTU and there are 7 pounds to the gallon.
- >GC>So a gallon of gas has 826,000 BTU. A BTU is 293e-6 kWH, so a gallon
- >GC>of gas is equivalent to 242 kWH. IC engines are about 23% efficient,
- >GC>so a gallon of gas is equivalent to 55.66 kWH. At $.11 a kWH, a gallon
- >GC>of gas is equivalent to $6.12 of electricity. So gas has to reach
- >GC>$6.12 a gallon before electricity becomes cost competitive. And that's
- >GC>if the vehicles are the same price.
- >
- >But aren't you forgetting that mechanically coupled EVs are better
- >than 50% efficient from the plug to the street and direct drives can
- >approach 80%. That, coupled with the reduced rates many utilities give
- >for off-hours charging, makes the EV more than competitive.
-
- Yes, he *DID* forget that EV's are about 50% efficient. If he'd added that
- in to his calculations, he'd've realized that the break-even price for
- gasoline is about $12.24/kWH. He *DID* take into account the fact that IC
- engines are only about 23% efficient. Next time, maybe you ought to take the
- time to read the post to which you're responding.
- --------------------------------------------------------------------------------
- Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL
-
- Disclaimer: Hey, I understand VAXen and VMS. That's what I get paid for. My
- understanding of astronomy is purely at the amateur level (or below). So
- unless what I'm saying is directly related to VAX/VMS, don't hold me or my
- organization responsible for it. If it IS related to VAX/VMS, you can try to
- hold me responsible for it, but my organization had nothing to do with it.
-