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Q4. At entry to a throttle, a mass of 1 kg of wet steam has a pressure of 16 bar and volume of 0.1221 m³.

It leaves the throttle at a pressure of 8 bar and expands in a hyperbolic process to a pressure of 1 bar.

(a) Calculate EACH of the following:

(i) the steam temperature at the throttle exit; (3)

(ii) the work transfer; (4)

(iii) the change of internal energy for the hyperbolic process; (4)

(iv) the final temperature of the steam. (2)

(b) Sketch the process on a Temperature-specific entropy diagram indicating the pressures and temperatures. (3)