A 0.3 m3 rigid tank initially contains refrigerant-134a at 14°C. At this state, 55% of the mass is in the vapor phase, and the rest is in the liquid phase. The tank is connected by a valve to a supply line where refrigerant at 1.4 MPa and 100°C flows steadily. Now the valve is opened slightly, and the refrigerant is allowed to enter the tank. When the pressure in the tank reaches 1 MPa, the entire refrigerant in the tank exists in the saturated vapor phase only. At this point the valve is closed. Determine the heat transfer between the system and the surroundings in kJ.