Arefrigeration plant operates in pretoria on refrigerant r134a at an evaporator pressure of 105 kpa (gauge) and a condensing pressure of 920 kpa (gauge). there is a sub-cooling of 3 k with a superheat of the gas entering the compressor of 8 k. the compressor is a four-cylinder reciprocating compressor with a bore of 67 mm and a stroke of 57 mm with an estimated capacity of 35 kw. the compressor is directly coupled to an electric motor running at 1470 rev/min and a power consumption of 19,5 kw. calculate: (a) the clearance volume efficiency if the compressor clearance is 3,6 %; (b) the actual volumetric efficiency; (c) the compression efficiency when the mechanical efficiency is 85% and the motor efficiency 90%.