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A four cylinder single acting ammonia compressor with cylinder dimensions as 7.5 ´ 10 cm operates at 600 r.p.m. Condenser and evaporator pressures are 12 and 2 bar respectively. The vapour from the evaporator to suction of compressor is dry and saturated and there is no under-cooling in the condenser. Compression takes place according to law

         PV1.2 = constant. If clearance is 2% of the stroke, calculate:

(i)     Refrigerating capacity in tons of refrigeration

(ii)    Power required to drive the compressor in  kW.

(iii)   Heat rejected to cylinder jacket water in kJ/min.

(iv)   Heat rejected to the condenser in kJ/min.

Take g value for NH3 as 1.31.

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