Re: Honda H2 FCEV goes 157 miles without refuelling

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Date: Wed, 29 Sep 2004 03:05:43 GMT

John Larkin wrote:
> On Tue, 28 Sep 2004 10:13:35 -0700, Charles Edmondson
> <edmondson@ieee.org> wrote:
>
>
>>John Larkin wrote:
>>
>>>On Mon, 27 Sep 2004 16:17:49 -0400, "G. R. L. Cowan" <gcowan@eagle.ca>
>>>wrote:
>>>
>>>
>>>
>>>>I've often said FCEV power is significantly less
>>>>efficient than ICE, here is some evidence that
>>>>to some extent is to the contrary:
>>>>http://msnbc.msn.com/id/6090680/
>>>>
>>>>
>>>>--- Graham Cowan
>>>>http://www.eagle.ca/~gcowan/Paper_for_11th_CHC.doc --
>>>>How individual mobility gains nuclear cachet
>>>
>>>
>>>
>>>Can anybody make sense of...
>>>
>>>"the fact that while the FCX's capacitor provides energy from braking
>>>while the car is moving, it doesn't store it while stopped. So from a
>>>stopped position, there's no extra punch to draw on."
>>>
>>>John
>>>
>>>
>>>
>>
>>John,
>>One of the problems with ultra-capacitors is that they can have a lot of
>>leakage current, i.e. they don't hold a charge very long. They are
>>great for holding a lot of current for a short time, such as a few
>>seconds, but if you get stopped at a light for 30-60 seconds, most of
>>that stored energy has leaked out of your capacitor bank.
>>
>>Don can probably go into greater detail, as I believe he has researched
>>them in more depth, but that is the simple answer... 8-)
>>--
>>Charlie
>
>
> If a capacitor absorbs horsepower-levels of power during braking, and
> can't store it long enough to assist the next start, it's not only
> useless, but it will obviously get hot enough to explode.
>
> I suspect the writer, another typical journalism major, just got
> something confused. Or the engineer was jiving him.

I would think he just didn't understand the physics. At 2
microampers/farad, leakage is just not a real issue.

>
> John

Best, Dan.

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