Re: Measuring Battery capacity/charge (Re: Understanding Automakers EV Perspective)

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Article #6134

#6134

From: Hugh Lippincott
Date: Fri, 19 Jan 1996 00:00

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In article <4dljq1$ffh@due.unit.no>, arnehoeg@stud.unit.no (Arne H|eg) writes:
|> These are mere ideas:

Correct!???

|> how to utilize solar power:
|> instead of using a narrow bandwith in solar cells, with a low
|> efficiency of energy conversion, why not just focus the sunrays
|> to create a large temperature difference, and apply an appropriate
|> heat engine?  The total efficience from sunlight to rotating wheels
|> should approach 60%.

What heat engine and drive train do you think could do that?

remember that a heat engine is at BEST limited by thermodynamics
if Th = the hot heat input temperature and
   Tc = the "cold" heat rejection temperature
both measured in absolute Temperature [Kelvin, or Rankine scale]

60% / (drive train efficiency) = (Th-Tc)/Th

assume drive train and engine is 90% efficient
and Tc is ~ atmospheric temperature 25 C  = ~300 K 

then Th must be 900 K = 625 C or ~1650 R = 1200 F
This sounds like a combined cycle gas turbine with a 
waste heat steam bottoming cycle.
-- 
	Hugh Lippincott 	      hughl@an.hp.com

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<4bf68t$pil@shellx.best.com> <4bkbji$d7p@news-2.csn.net> <4blep8$630@spectator.cris.com> <4bmive$6ti@ixnews6.ix.netcom.com> <4bp03k$76@news.scruz.net> <4bp75m$p0d@cloner2.ix.netcom.com> <4bq1s8$fgn@spectator.cris.com> <4brse9$b2u@ixnews8.ix.netcom.com> <4bsmkq$3qs@spectator.cris.com> <4bun4g$83u@cloner2.ix.netcom.com> <30ee482c.33105000@news.teaser.fr> <4crkph$i6v@ixnews6.ix.netcom.com> <30f28311.9516250@news.teaser.fr> <4cuh1a$fre@ixnews2.ix.netcom.com> <4d3p8j$ak4_001@minerals.csiro.au> <4dljq1$ffh@due.unit.no>

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From: hughl@news.an.hp.com (Hugh Lippincott)
Subject: Re: Measuring Battery capacity/charge (Re: Understanding Automakers EV Perspective)
Date: 1996/01/19
Message-ID: <4dopo0$qcr@hpaneqb4.an.hp.com>
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references: <4bf68t$pil@shellx.best.com> <4bkbji$d7p@news-2.csn.net> <4blep8$630@spectator.cris.com> <4bmive$6ti@ixnews6.ix.netcom.com> <4bp03k$76@news.scruz.net> <4bp75m$p0d@cloner2.ix.netcom.com> <4bq1s8$fgn@spectator.cris.com> <4brse9$b2u@ixnews8.ix.netcom.com> <4bsmkq$3qs@spectator.cris.com> <4bun4g$83u@cloner2.ix.netcom.com> <30ee482c.33105000@news.teaser.fr> <4crkph$i6v@ixnews6.ix.netcom.com> <30f28311.9516250@news.teaser.fr> <4cuh1a$fre@ixnews2.ix.netcom.com> <4d3p8j$ak4_001@minerals.csiro.au> <4dljq1$ffh@due.unit.no>
organization: Hewlett-Packard Company
newsgroups: ca.environment,sci.energy,sci.chem.electrochem,sci.chem.electrochem.battery

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