Air flows adiabatically in a converging duct, which is fed from a large reservoir where the temperature and the pressure are 305 K and 210 kPa, respectively. At the end of the duct,
where the cross-sectional area is 0.0025 the pressure and temperature are 172 kPa and
278 K, respectively, Determine the Mach number at the end of the duct and find the mass
flow rate.​

The catalogue for a refrigerant 22, four-cylinder, hermetic compressor operating at 29 r/s. a condensing temperature of 40°c and an evaporating temperature of -4°c shows a refrigeration capacity of 115 kw. at this operating point, the motor (its efficiency is 90 percent) draws 34.5 kw. the bore of the cylinders is 87 mm and the piston stroke is 70 mm. the performance data are based on 8°c of sub-cooling of the liquid leaving the condenser. compute (a) the actual volumetric efficiency and (b) the compression efficiency.