A 1 hp motor is used for running a dual cylinder reciprocating compressor of a refrigeration system based on R-134a refrigerant having 185 kJ kg-1 cooling capacity. COP of the system is 4.2 and overall efficiency of the compressor is 80%. Specific volume of the refrigerant vapour at suction temperature is 0.15 m3 kg-1. The compressor with bore diameters of 40 mm each runs at 1440 rpm.
The mass flow rate of the refrigerant in kg min-1 is