Total oil temnperature Rise of shield over oil Rise of conductor over shield Total =32.9+0.3 =33.2 deg C =21.6X0.14=3.0 deg C = 12.0 deg C 48.2 deg C(Note: The original assumption of 33 degrees centigrade for the average oil temperature therefore is justified. If this figure had differed more widely from 33 degrees centigrade, the calculation would have to have been repeated, using a different assumed oil temperature.) Thus, if the oil in the pipe is used as a circulating and cooling medium, with an inlet oil temperature of 30.0 degrees centigrade, and a velocity of flow of 1.0 foot per second, the conductor temperature will be reduced from 75.1 to 48.2 degrees centigrade, that is, the temperature rise over the earth ambient is just about cut in half, in this particular case.
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