From: Warrl kyree Tale'sedrin (warrl@blarg.net)
Date: Wed Dec 10 1997 - 23:19:07 MST
> From: Michael Lorrey <retroman@together.net>
I just gotta point out one detail that I suspect is a minor error:
> Eugene Leitl wrote:
> Electric vehicles are, in total, around 45% efficient on average,
> while Internal Combustion vehicles are 18% efficient, on average.
> This is a comparison of only the engine, power source, power train,
> and rolling and aerodynamic friction. When Power plant efficiencies
> are figured in, it comes out that EVs are on average 3 times more
> energy efficient, and, including power plant emissions, 33% cleaner
> than current IC technology. (of course, this fails to measure
> emissions of oil refineries, hint hint)
You're implying that you aren't factoring in the energy cost of the
refining and transportation of gasoline.
Three times 18% is 54%. You're saying that the complete power cycle
of an electric car is three times as efficient as the internal power
cycle of a standard IC engine car, or 54% efficient. However, you
also say that the internal power cycle of an electric car is only 45%
efficient. This implies that the efficiency of the electric power
plant, transmission system, and battery charging system (or
equivalent) is rather in excess of 100%.
US$500 fee for receipt of unsolicited commercial email. USC 47.5.II.227
This archive was generated by hypermail 2.1.5 : Fri Nov 01 2002 - 14:45:12 MST