A piston-cylinder device initially contains 20 g of saturated water vapor at 300 kPa. A resistance heater is operated within the cylinder with a current of 0.4 A from a 240 V source until the volume doubles. At the same time a heat loss of 4 kJ occurs. Determine
(a) The final temperature (T2),
(b) Duration of the process and
(c) second-law efficiency. Assume the surrounding temperature and pressure to be 20oC and 100 kPa, respectively.
(d) What-if Scenario: What would the efficiency be if the heat loss were negligible during the process?