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.