Example 3.9 The following data were obtained from a test on a twin cylinder, single acting 15 cm x 20 cm, 320 rpm compressor ammonia refrigeration plant. Temperatures of refrigerant: After expansion valve, entering brine cooler Leaving brine cooler Entering compressor Leaving compressor Entering condenser -25°C -18°C -8°C 140°C 130°C 30°C 32°C 13.5 bar 1.324 bar Leaving condenser Entering expansion valve Pressures of refrigerant: Compressor discharge and condenser Compressor suction Brine circulation rate Temperature drop of brine in cooler Specific heat of brine Input to motor Motor efficiency at this load Compressor jacket cooling water Temperature rise of jacket water 102 kg/min 7°C 3.14 kJ/(kg) (K) 18.8 kW 92% 5 kg/min 8.9°C Show the thermodynamic states at various points on p-h and T-s diagrams and calculate: (a) Refrigerating capacity in TR assuming 2 per cent loss of useful refrigera- tion by heat gain from room in brine cooler. (b) Ammonia circulated. (c) Compressor IHP and mechanical efficiency. (d) Compressor volumetric efficiency. (e) COP of the cycle.