Question

2. Steam heating simplifications [3 marks] A flow of 1 kg/s of superheated steam at 5 barg (6 bar absolute) is cooled and condensed at constant pressure from an initial temperature of 180°C to a final temperature of 140°C. What are the rates of energy removal (W) corresponding to: (i) Cooling the superheated vapour to its condensation point? (ii) Condensing the vapour? (iii) Subcooling the liquid? What are the percentage contributions to the total energy change? Data: Tsat = 159°C cpv = 2284 J/(kg°C) cpl = 4287 J/(kg°C) ? = 2087 kJ/kg

Answer 1