In previous HW, we considered a throttle valve used in a refrigerator. As a reminder, refrigerant R134a flows through a well-insulated throttling valve inside a refrigerator. The refrigerant enters the throttling valve at 1MPa and 38C (compressed liquid) and exits the valve at 100kPa as a saturated mixture and quality of 0.405. (a) Find the exergy destruction in the valve per kilogram of refrigerant. Assume that the environment is at 300 K and 100 kPa. (Answer: 12.9 kJ/kg)