In 1772, John Smeaton used the results of his tests on various existing Newcomen cycle engines to design and build his own atmospheric steam engine.
It had a 52.0-inch diameter piston with a 7.0 ft stroke and operated at 12.5 strokes per minute with a mean effective pressure of 7.50 lbf/in2 . It produced a remarkably high duty of 9.45 million.
Determine the
(a) thermal efficiency,
(b) the horsepower output, and
(c) the boiler heat input rate of this engine. Ignore the boiler feed pump power requirement.