Answer Happy

11. A heat pump working on the ideal vapour compression cycle heats the supply air to building The heat is supplied from a nearby river at 7°C. The air is supplied at into the building at 1013 bar and 32Cat a rate of 0.5 m/s. This air is heated at constant pressure from 10' when it passes through the condenser of the heat pump. The refrigerant used is R134a which is dry saturated, when leaving the evaporator. There is no undercooling in the condenser. A temperature difference of 17K is required to facilitate the heat transfer from the river to the refrigerant in the evaporator. The delivery pressure of the compressor is 11.545 bar. Given Rar=287J/kgk and Cpu - 1.005 kJ/kg , determine the: a) mass flowrate of the refrigerant [10 marks] b) work generated by the compressor [5 marks) c) power required to drive the compressor if the mechanical efficiency is 87%. (5 marks) d) COPP [5 marks)