Also, some energy goes into the HVAC for creature comfort regardless of
location.
Yes, simplification does begin with the SI.
Stan Doore
----- Original Message -----
From: Bill Hooper
To: U.S. Metric Association
Sent: Monday, July 14, 2008 10:38 PM
Subject: [USMA:41423] Re: Newton for automobile efficiency
On Jul 14 , at 6:09 PM, lps wrote:
This makes me wonder how much actual power is output by a liter of fuel in
my car. I am sure not all of the energy is transferred from the fuel into
forward motion.
Of course it's not!
A great deal of the energy from the burning gasoline goes out the tailpipe as
hot exhaust, or goes to friction in bearings, cylinders, transmission, etc, not
to mention the running of air conditioning, lights, etc., friction with the air
the car has to push through, heat absorbed by the cooling system and put into
the air via the radiator, etc. etc. etc.
And even the energy of the car's forward motion is all lost to heat as the
brakes slow down the car by rubbing against the break shoes (making them hot)*.
Regards,
Bill Hooper
Fernandina Beach, Florida, USA
*Unless, as in same hybrids and electric cars where regenerative braking is
used. That converts the forward motion energy into electrical energy which is
then stored in a battery where it can be used again.
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SImplification Begins With SI.
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