A simple vapour compression plant produces 5 tonnes of refrigeration. The enthalpy values at inlet to compressor, at exit from the compressor, and at exit from the condenser are 183.19, 209.41 and 74.59 kJ/kg respectively. Estimate: (ii) The C.O.P., (i) The refrigerant flow rate, (iii) The power required to drive the compressor, and (iv) The rate of heat rejection to the condenser. (AMIE)