An activated sludge aeration blower is delivering air todiffusers in an aeration tank. You want to estimate the isentropicefficiency and the work input (by the motor). At the blower inlet,the volumetric flow rate is measured at 85 m3/min, the pressure is0.98 atm and the temperature is 20â°C. If the pressure is increasedto 1.61 atm and the blower outlet temperature is 350 K: a) what isthe blower isentropic efficiency, and b) what is the work input(kW) to the blower (by the motor)? Hints: k for air can be taken(Table A-2b) as 1.40; you can use Equation 8-43 to determine theisentropic process T2 value. You can use the Ideal Gas Law todetermine the mass flow rate based on the inlet conditions andvolumetric flow rate. Cp can be obtained from Table A-2b (From:Introduction to Thermodynamics and Heat transfer).
