1. Saturated water vapor at 10.0 kPa is expanded reversibly and isentropically in a steady flow process in a doorknob heat treating plant to 5.00 kPa. Determine the final temperature, the heat transfer rate, and the power produced per unit mass flow rate. Assume the steam is an ideal gas.
2. Design a system to liquefy nitrogen by repeatedly expanding it until it reaches the saturation temperature. (Hint: Consult your library about the Linde gas liquefaction process.)