A VCRS system having a capacity of 1 tonne of refrigeration operation between -28°C and 26°C The refrigerant is sub-cooled by 4°C before entering the expansion valve and the vapour is superheated by 5°C before leaving the evaporator. The machine has a six-cylinder single-acting compressor with a stroke equal to 1.25 times the bore. It has a clearance of 3% of the stroke volume. The volumetric efficiency in percentage is _______ [up to 2 decimal] use following table

Temp (°C)	Pressure (bar)	Specific volume of vapour (m3/kg)	Enthalpy KJ/kg		Entropy  KJ/kg
			Liq	Vapour	Liq	vapour
-28	1.093	0.1475	10.64	175.11	0.0444	0.7153
26	6.697	0.0262	60.67	198.11	0.02271	0.6875

Specific heat of liquid refrigerant = 0.763 kj/kg k

Specific heat of superheated vapour = 0.615 kj/kg k