A Roots blower supplies air at the rate of 1 kg/s. The pressure ratio of the blower is 2:1 with an intake pressure and temperature of 1 bar and 70°C, respectively. Find the power required to drive the blower. Take R = 0.29 kJ/kg K. If a vane pump having the same air flow, pressure ratio and intake conditions has the volume reduced to 0.7 of the intake volume before delivering the air, estimate the power required.

A Roots blower supplies air at the rate of 1 kg/s. The pressure ratio of the blower is 2:1 with an intake pressure and temperature of 1 bar and 70°C, respectively. Find the power required to drive the blower. Take R = 0.29 kJ/kg K. If a vane pump having the same air flow, pressure ratio and intake conditions has the volume reduced to 0.7 of the intake volume before delivering the air, estimate the power required.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Albert bought a portable device to pump his truck tyres. On the manual, he found out that the device is a single stage, single-acting air compressor. Air delivery for this device is 30 bar at a speed of 1500 rev/min. The atmospheric condition of his location is 87 kPa and 20 ˚C, with a FAD of 0.22 m2/min. The clearance volume is 4% of the swept volume and the stoke/bore ratio is 1.3/1. Take “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K 1.Provide the answer values of the bore in mm to 2 decimal places.