4.007 SI Ammonia enters the expansion valve of a refrigeration sys- tem at a pressure of 10 bar and a temperature of 20C and exits at 3.0 bar. The refrigerant undergoes a throttling process. Determine the temperature, in C, and the quality of the refrigerant at the exit of the expansion valve. Step 1: Determine the temperature of the refrigerant at the exit, in C. Step 2: Determine the quality of the refrigerant at the exit of the expansion valve.