10 tons of refrigeration is required for a food storage space to keep the food stuff cool. The refrigerant used in the plant is Freon-12 and is subcooled by 5°C before entering in the expansion valve. The temperature of evaporator and condenser are –8oC and 30°C respectively. The vapour is superheated to 6°C before leaving the evaporator coil. The compressor is of two cylinders, single acting type having stroke equal to 1.5 times the bore. The compressor runs at 800 rpm and the compression is assumed to be isentropic. Estimate the following:
(i) refrigerating effect per kg
(ii) mass flow rate of the refrigerant
(iii) theoretical piston displacement
(iv) theoretical power
(v) C.O.P. and
(vi) theoretical bore and stroke of the compressor