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A Freon – 12 vapour compression system is operating at a condenser pressure of 9,.6 bar (960 kPa) an and evaporator pressure of 2.19 bar (19 kPa). Its refrigerating capacity is 15 tons. The values of enthalpy at the inlet and the outlet of the evaporator are 64.6 kJ/kg and 195.7 kJ/kg. The specific volume at the inlet to reciprocating compressor is 0.082 m3/kg. The index of compression  (or polytrophic exponent) for the compressor is 1.13.  

      Determine

      (a) The power input in kW

      (b) The coefficient of performance

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