On Aug 6, 2006, at 2:44 AM, Vitaliy wrote:

> I remember a while back one of the presenters at the local SAE chapter 
> meeting mentioned that storing the braking energy as
> compressed air achieves up to 70% efficiency, compared to
> only 20% for batteries.

I find both figures hard to believe.  70% is about the number
I see quoted for high efficiency gas turbines (which do NOT
operate on compressed gas; efficiency is dependent on gas input
temperature.)  I'm pretty sure compression is nowhere near that
efficiency.  And battery charging is more than 20% efficient
as well.  They might be comparing an overall cycle efficiency
for electric to a hypothetical compressed gas motor efficiency,
or they might just be wrong...

BillW

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