A piston-cylinder device initially contains 0.1 m3 of steam at 200°C. The force on the piston is such that it maintains a constant pressure of 400 kPa inside. Due to heat rejection to the ambient air, the temperature of the steam drops down to 25°C. To restore the steam temperature to its original value, superheated steam from a supply line at 1 MPa, 600°C is introduced through a valve into the cylinder as shown in the accompanying figure. Neglecting any heat transfer during this charging process, determine.
(a) The heat transfer during the cooling process.
(b) The mass of steam introduced.