Same as Problem 1 but film temperature is at 180°F.
Problem 1
A 3 in. diameter × 3 in. long 360° bearing is lubricated with SAE 30 oil. Speed is 1800 rpm. Load P is 500 psi projected journal area, r/c = 500. Cooling rate for housing is 8 Btu per hour per square foot per degree F. Take housing area in cooling as 16 times the developed journal area. Find the horsepower required to operate the bearing and the rise in temperature ΔTh of the housing if the film temperature is 175°F.
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