A piston-cylinder assembly contains 2 lb of water, initially at 300°F. The water undergoes two processes in series: constant-volume heating followed by a constant-pressure process. At the end of the constant-volume process, the pressure is 100 lbf/in.2 and the water is a two-phase, liquid-vapor mixture with a quality of 80%. At the end of the constant-pressure process, the temperature is 400°F. Neglect kinetic and potential energy effects.
(a) Sketch T-v and p-v diagrams showing the key states and the processes.
(b) Determine the work and heat transfer for each of the two processes, all in Btu.