Consider a diffuser in which air flows steadily. At the inlet ofthe diffuser the pressure, the temperature and the velocity of theair are 100 kPa, 110oC and 175 m/s, respectively. At the exit ofthe diffuser the pressure, the velocity of the gas and the area ofthe diffuser are 110 kPa, 15 m/s and 0.1 m2 , respectively.Accounting for an heat loss of 3 kJ/kg from the diffuser to thesurroundings at 100 kPa and 25oC and assuming constant specificheats, determine (a) the exit temperature, (b) the rate of exergychange and (c) the second-law efficiency of the diffuser where ηII,diffuser = exergy output exergy input .
