A system consisting of 1 kg of H2O undergoes a power cycle composed of the following processes:

Process 1-2: Constant-pressure heating at 10 bar from saturated vapor

Process 2-3: Constant-volume cooling to p3 = 5 bar, T3 = 160 degree Celsius

Process 3-4: Isothermal compression with Q34 = -815.8 kJ

Process 4-1: Constant-volume heating.

Sketch the cycle on T-v and p-v diagrams. Neglecting kinetic and potential energy effects, determine the thermal efficiency.