8-83 A 0.2-m³ rigid tank initially contains saturated refrig-

erant-134a vapor at 1 MPa. The tank is connected by a valve

to a supply line that carries refrigerant-134a at 1.4 MPa and

60°C. The valve is now opened, and the refrigerant is allowed

to enter the tank. The valve is closed when one-half of the vol-

ume of the tank is filled with liquid and the rest with vapor at

1.2 MPa. The refrigerant exchanges heat during this process

with the surroundings at 25°C. Determine (a) the amount of

heat transfer and (b) the exergy destruction associated with this

process.