A rigid 0.2 m3 tank is initially filled with saturated liquid water at 150C until a valve is opened at the bottom of the tank, removing one-half of the total water mass as a saturated liquid. Heat is transferred from a source at a constant temperature of 250C in order to maintain a constant temperature in the tank during the emptying process.

A) What is the amount of heat transfer required to maintain a constant temperature during this process?

B) What is the phase of the water after half the mass has been removed (i.e. saturated liquid, vapor, saturated mixture of liquid and vapor, etc.)? How do you know this?

C) What is the entropy generated during the process?