165 lines
6.2 KiB
Plaintext
165 lines
6.2 KiB
Plaintext
From fork-admin@xent.com Fri Sep 6 11:41:25 2002
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To: fork@example.com
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From: "R. A. Hettinga" <rah@shipwright.com>
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Subject: Re: Electric car an Edsel...
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Ouch.... hooooo....
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Cheers,
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RAH
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--- begin forwarded text
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Status: RO
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Date: Thu, 5 Sep 2002 09:17:13 -0700
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From: Same Guy
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Subject: Re: Electric car an Edsel...
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To: "R. A. Hettinga" <rah@shipwright.com>
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Bob,
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This guy's an idiot.
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I design loads for systems with the 50 kV capacitors. One of those has 864
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of such capacitors and stores only 10 megajoules, which means 11 kilojoules
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each. They weigh 125 kg.
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You need high energy per unit mass, and the capacitive system I picked
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maximizes that.
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It is precisely the system that Maxwell is touting for electrical braking
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and power augmentation for regenerative use in automobiles. You also need
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voltage you can use in a DC motor, which is why though the actual
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capacitors in the system are charged to 2.5 volts, the system has them
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arranged in series to boost the voltage.
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Ignore him. He's a waste of my time.
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<Somebody's .sig>
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------------------------
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From: "R. A. Hettinga" <rah@shipwright.com>
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Subject: Re: Electric car an Edsel...
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Date: Wed, 4 Sep 2002 15:31:39 -0400
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To: Some people...
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--- begin forwarded text
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Status: RO
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Date: Wed, 4 Sep 2002 07:59:10 -0700 (PDT)
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From: "Adam L. Beberg" <beberg@mithral.com>
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To: "R. A. Hettinga" <rah@shipwright.com>
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cc: <fork@example.com>
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Subject: Re: Electric car an Edsel...
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On Wed, 4 Sep 2002, R. A. Hettinga wrote:
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> Maxwell (www.maxwell.com) makes and sells high energy density capacitors,
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> called ultracapacitors. They deliver them in an air-cooled, voltage
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> regulated module that will charge to 42 V and hold 128 kilojoules -- roughly
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> the energy in 2 teaspoons of sugar or a bite of a donut -- and weighs 16
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> kilograms. If that electrical energy could all be converted to kinetic
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> energy, there's enough to get the capacitor module up to about 200 mph -- in
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> a vacuum.
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Since the energy you can pack into a capacitor is something like
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1/2*C*(V^2), you want to design your system with the lowest voltage possible
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to fully exploit that V^2 ;) So yea, a 42V system will only be useful for
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accelerating insects, not cars. That must be why 40kV is standard not 42.
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(the joke of putting 42 into goggle to find that model was not missed BTW)
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Most production systems use a mix of batteries and capacitors, as very few
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real world applications run for less then 10 seconds like the car we were
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talking about originally. Even 10 seconds is pushing the "capactior is the
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wrong choice" limits. Thats why the landspeed record model is a battery one,
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it's got to run for a much longer period of time and needs a steady
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discharge curve.
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But it should be safe to say that most people want the Indy 500 version, not
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the 1/4 mile sprint version when they are looking for a vehice :) For those
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you dont want a battery or a capacitor, you want to take advantage of whole
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atoms, not just electrons. Then you can suck off the electrons you need with
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a fuel cell. However, you will use both capacitors for the braking/accel,
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and batteries to not just dump excess energy in the design.
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- Adam L. "Duncan" Beberg
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http://www.mithral.com/~beberg/
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beberg@mithral.com
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--- end forwarded text
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--
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-----------------
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R. A. Hettinga <mailto: rah@ibuc.com>
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The Internet Bearer Underwriting Corporation <http://www.ibuc.com/>
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44 Farquhar Street, Boston, MA 02131 USA
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"... however it may deserve respect for its usefulness and antiquity,
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[predicting the end of the world] has not been found agreeable to
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experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'
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---------------End of Original Message-----------------
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--- end forwarded text
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--
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-----------------
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R. A. Hettinga <mailto: rah@ibuc.com>
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The Internet Bearer Underwriting Corporation <http://www.ibuc.com/>
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44 Farquhar Street, Boston, MA 02131 USA
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"... however it may deserve respect for its usefulness and antiquity,
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[predicting the end of the world] has not been found agreeable to
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experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'
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