-----Original Message-----
From: Fisher, Michael L
Sent: Friday, May 31, 2002 5:45 PM
To: 'jumpinjan'
Subject: RE: Too Hot!!
Not so,
The radiator is a more efficient "cooler" than the engine is a "heater."
This is because heat transfer from the radiator is via convection (it really
should be called a convector not a radiator) and heat transfer in the engine
is via conduction. Convection is typically dependent on (T_hot^5/4 -
T_cool^5/4) and conduction is dependent on (T_hot - T_cool). So the radiator
transfers heat to the ambient air more efficiently (read faster) than the
combustion gases transfer heat to the coolant.
This is really just a fluid transfer problem with a heat source and a heat
sink. If you have MathCAD, I can forward you an analysis to show how this
works. If you don't believe the physics, try it! Wait for a day where the
ambient temp is about 85 F. Take out the thermostat and watch your car
overheat. Put the thermostat back in and the car will not overheat. It
works.
-----Original Message-----
From: jumpinjan [mailto:jservaites@woh.rr.com]
Sent: Friday, May 31, 2002 8:37 PM
To: Fisher, Michael L
Cc: Rob Taylor; Alpine mailing list
Subject: Re: Too Hot!!
Mike,
The thermostat regulates how much cool water flows through the
engine.
The radiator ALWAYS losses heat, so if the flow is not restricted the
engine can't reach the operating temperture (160-180 degrees).
Jan
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