[TR] Interesting cooling system web page

[tom white]

The analogy between water and air has a minor defect.  The air moving through
a radiator is already cool and the new air remains cool until passing through
the radiator.  The coolant entering the radiator is hot, duh.  If hot coolant
passes through the radiator at one gallon per minute or two gallons per minute
the one gallon per minute amount will exit the radiator cooler.  Theoretically
twice as cool as the two gallon per minute.

The available cooling potential of the water is also affected by it's speed
through the engine.  There is a critical point where the water can move
through the engine too fast to use it's cooling potential efficiently.

For example if water enters the radiator at 210 degrees and exits at 200
degrees  the available cooling potential is 10 degrees.  If the same water
exits the radiator at 190 degrees there is 20 degrees of potential.  Water or
coolant do not absorb heat instantaneously.  The water passing through the
engine slower will absorb more heat.

The point is you must balance the speed of the water to obtain the maximum
cooling with the engine.

In my car the operating temperature will rise with the rpms until it
overheats.  Moving water through the radiator faster as the engine increases
it's speed raises the temperature of the water and limits it's cooling
potential and efficiency.  As in the article on cooling the only way to
improve this was to increase air flow.





Best regards,
Tom



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