Re: Honda H2 FCEV goes 157 miles without refuelling

From: John Larkin (jjlarkin_at_highlandSNIPtechTHISnologyPLEASE.com)
Date: 09/29/04 

Date: Tue, 28 Sep 2004 19:47:51 -0700

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.

John

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