A major U. S. manufacturer of HVAC equipment is considering the use of propane as a refrigerant for a residential air conditioner in a hot climate. As a first step, an engineer wants to understand the operating conditions for an adiabatic throttling device that would be used. The design inlet condition is a saturated liquid at a pressure of 18 bar. The engineer would like the throttle outlet condition to be a two-phase mixture at a temperature of 4°C. With this information, determine the exit pressure (kPa) and quality. Depict the process on a P-v diagram showing the dome and appropriate lines of constant temperature. Label the state points and show values of pressure and specific volume on the axes.