1kg of ammonia in a piston/cylinder at 50°C, 1000 kPa is expanded in a reversible adiabatic process to 100 kPa. Find the work for this process.

1kg of ammonia in a piston/cylinder at 50°C, 1000 kPa is expanded in a reversible adiabatic process to 100 kPa. Find the work for this process. Correct Answer 232.4 kJ

1Q2 = 0 ⇒ s2 = s1 and u1 = 1391.3 kJ/kg, s1 = 5.2654 kJ/kg K sg2 = 5.8404 kJ/kg K, sf = 0.1192 kJ/kg K; x2 = (s – sf)/sfg x2 = (5.2654 − 0.1192)/5.7212 = 0.90; u2 = uf + x2 ufg = 27.66 + 0.9×1257.0 = 1158.9 kJ/kg 1W2 = 1 × (1391.3 – 1158.9) = 232.4 kJ.
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