A double-acting compound steam engine has a common stroke of 400 mm. The supply pressure is 17.25…

A double-acting compound steam engine has a common stroke of
400 mm. The supply pressure is 17.25 bar while the exhaust pressure is 0.415
bar. The diameter of the L.P. cylinder is 450 mm. The ratio of cylinder volumes
is 2.5 : 1. The diagram factor referred to the L.P. cylinder is 0.78. The
initial piston loads in the cylinders are equal. The engine runs at 270 r.p.m.
The total expansion ratio is 9. Neglecting clearance and assuming hyperbolic
expansion, calculate:

(a) The intermediate pressure

(b) The indicated power

(c) The diameter of the H.P. cylinder