Water is drawn from a river at 7°C and has to be heated to 64°C. Calculate the advantage of using the heat pump plant described below over direct heating of the water. The water drawn from the river passes first through the Freon condenser and then through the steam condenser. Assume that a heat source above 450°C is available. Freon-12 Heat Pump compressor is driven by steam turbine. Its condenser temperature 60°C and evaporator temperature –5°C. Freon-12 enters compressor as saturated vapour and enters throttle valve as saturated liquid. Steam pressure and temperature leaving boiler 30 kg/cm2 and 450°C respectively. Steam condenser temperature 76°C. Enthalpy values of Freon- 12: At entry to compressor 187 kJ/kg, at discharge of compressor 221.5 kJ/kg and at exit condenser 90 kJ/kg. (4.18 kJ = 1 kcal).