6. A forced draft centrifugal fan draws air at 1.32 cubic meter/sec towards a combustion chamber of a steam generator. The static pressures are 15mm. water below atmospheric at suction and 10mm. water above atmospheric at the discharge. The inlet duct is 30cm in diameter and the discharge duct is 27cm in diameter. The fan mechanical efficiency is 70%. The air is measured at 25 degrees Celsius and 760mmHg. Determine:

6. A forced draft centrifugal fan draws air at 1.32 cubic meter/sec towards a combustion chamber of a steam generator. The static pressures are 15mm. water below atmospheric at suction and 10mm. water above atmospheric at the discharge. The inlet duct is 30cm in diameter and the discharge duct is 27cm in diameter. The fan mechanical efficiency is 70%. The air is measured at 25 degrees Celsius and 760mmHg. Determine:

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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2. A centrifugal pump consists out of an impeller, diffuser and casing and is powered by 300 kW (shaft power) and rotates at 96.3 rad/s. The flow rate generated by the machine is54.7 Kilo-litres/min. The impeller blade inlet angle and width is 23° and 180 mmrespectively. The blades occupy 12% of the impeller area and the water is assumed toenter the impeller radially. Suction and delivery pipes are equal in size. Determine:2.1. The impeller inlet (i) diameter and inlet blade velocity. (Hint - Substitution: Vfi in terms of Di and Ui in terms of Di both sub into Tan of Blade inlet angle, only unknown is then solving for Di2) 2.2 If the pump has a mechanical efficiency of 80%, calculate the blade velocity at outlet (Uo) and outlet whirl velocity Vwo. Assume the blade exit angle equal to the guide vane angle. (Hint - Substitution: Write Vwo in terms of Uo sub in Euler equation only unknown then is solve for Vwo 2.3 Impeller outer diameter. 2.4 If the flow through velocity is consistent…
QUESTION 1:A centrifugal pump consists out of an impeller, diffuser and casing and is powered by 300kW (shaft power) and rotates at 96.3 rad/s. The flow rate generated by the machine is54.7 Kilo-litres/min. The impeller blade inlet angle and width is 23° and 180 mmrespectively. The blades occupy 12% of the impeller area and the water is assumed toenter the impeller radially. Suction and delivery pipes are equal in size.Determine:1.1The impeller inlet (i) diameter and inlet blade velocity.(Hint - Substitution: ln in terms of D and U, in terms of D, both sub into Tan of Blade inlet angle,only unknown is then solving for Dz)1.2.If the pump has a mechanical efficiency of 80%, calculate the blade velocity atoutlet (U.) and outlet whirl velocity Vw.. Assume the blade exit angle equal to theguide vane angle. (Hint - Substitution: Write Vw in terms of U, sub in Euler equation onlyunknown then is solve for Vwo)1 3Impeller outer diameter.1.4,If the flow through velocity is consistent through the…
A 6inx10in in direct acting duplex pump with 1.5inches in piston rods make 35 double stroke percylinder per minute and delivers 135gpm of 100°F water against a total head of 460ft. The steamis supplied to the steam end at pressure of 150psig and exhaust to the atmosphere. Amount ofsteam supplied is 3800lb per hr at 0.98 quality; barometer is 20.6inHg. Assume that the pistonmake full stroke. Find the piston displacement of the pump in cm3/sec.
The impeller of a centrifugal pump having external and internal diameter 500mm and 250mm respectively, width at out let 50mm and running at 200rpm works against a head of 48m. The velocity of flow through the impeller is constant and equal to 3m/s the vanes are set back at an angle of 400 at outlet. Determine A.inlet vane angle B.workdone by the impeller on water per second c.manometric efficiency
Seven hundred gallons per minute of water are being discharged by a centrifugal pump 5 ft above the pump inlet. The inlet pressure is 4-in Hg above the atmospheric and the discharge pressure is 29 psia. If the pump has an 8-in diameter inlet and a 4-in diameter discharge, find the new flowrate if thr pump speed is doubled. Assume the pump input is 8Hp. A. 700 gpmB. 1050 gpmC. 1400 gpmD. 1750 gpm
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Exercise 5.2 A Pelton wheel of 1.8 m in diameter and deflecting angle of the bucket 160° rotates at 400 rpm. The jet diameter is100 mm, the effective head to the nozzle is 135 m, and the nozzle coefficient is 0.97. Determine the a. output power if overall efficiency if the is 95%
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 thisdevice is 30 bar at a speed of 1500 rev/min. The atmospheric c ondition of his location is 87 kPa and 20 ˚C, with a FAD of 0.22 m2/min. The clearance volume is 4% of theswept 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 Calculate 1 What is the delivery volume in terms of stroke volume, provide the coefficient values of the swept volume to 4 decimal places? 2 What is the delivery isothermal efficiency of the compressor percentages to 2 decimal places? 3 What is the induced volume per stroke in m3 to 6 decimal places?
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 thisdevice is 30 bar at a speed of 1500 rev/min. The atmospheric c ondition of his location is 87 kPa and 20 ˚C, with a FAD of 0.22 m2/min. The clearance volume is 4% of theswept 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 Calculate 1 Determine the volumetric efficiency in percentage to one decimal place. 2 What is the isothermal power of the compressor in kW to 2 decimal places in kW 3 Provide the answer values of the stoke in mm to 1 decimal place.
3.11) The conditions of air at the entry of an axial compressor stage are: Рi %3D 768 тт Hg & Ti = 314 K. The air angles are B1 = 51°, B2 = 9°, a1 = az = 7°. The mean diameter 50 ст. The peripheral speed 100 m/s. Mass-flow rate 25 kg/s work done factor 0.95 mechanical efficiency 92 % stage efficiency 88 % (a) Air angle at the stator entry, [a2 50.18°] (b) Blade height at entry and the hub-tip diameter ratio, [h, = 19 cm ; dn/d = 0.449] (c) Stage loading coefficient. [V = 0.754] (d) Stage pressure ratio. [Po3/Po1 1.075] (e) The power required to drive the stage. [Power = 204.75 kW]
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