Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is_______________?

Question

Accepted Answer

Superheated vapour. Since the exit entropy (6.65 kJ/kg·K) is less than the maximum possible entropy at 150 kPa (7.2234 kJ/kg·K), and it's not equal to the saturated vapor entropy, the steam remains superheated.