1.  

A four - cylinder, single-acting R-12 compressor 30 cm x 40 cm runs at 960 rpm. The compressor clearance factor is 0.03 and the law of compression pV1.1 = C. the operating pressures for the vapor compression refrigeration system are 8.47 bar (35\deg C) and 1.004 bar (-30\deg C). The refrigerant temperatures are: entering the compressor -20\deg C, leaving the compressor 50\deg C; entering the condenser 45\deg C, leaving the condenser 25\deg C, entering the expansion valve 30\deg C and leaving the evaporator dry saturated. Assuming that the heat removed in the compressor is 25 kJ/sec. calculate: i) The refrigerating capacity ii) The compressor power iii) COP iv) Mass of condensing cooling water assuming the rise in temperature to be 10\deg C v) Also tabulate the energy balance for 1 kg of refrigerant.