Question

A cylinder fitted with a frictionless piston contains water. A constant hydraulic pressure on the back face of the piston maintains a cylinder pressure of 10 MPa. Initially, the water is at 700°C, and the volume is 100 L. The water is now cooled and condensed to saturated liquid. The heat released during this process is the Q supply to a cyclic heat engine that in turn rejects heat to the ambient at 30°C. If the overall process is reversible, what is the net work output of the heat engine?

Answer 1

C.V.: H₂O, 1 →  3, this is a control mass: 

 Q_H = -₁Q₃ = 5652.6 kJ 

Take control volume as total water and heat engine. Process: Rev.,