ENGG 2230 Lecture Notes - Horsepower, Centrifugal Pump, Impeller
9 Apr 2013
School
Department
Course
Professor
Document Summary
11. 22 a 37-cm-diameter centrifugal pump, running at 2140 rev/min with water at 20 c produces the following performance data: Solution: efficiencies, computed by gqh/power, are listed above. The best efficiency point (bep) is approximately 92% at q 0. 2 m3/s. At what speed, when pumping water, should the 41. 5-inch pump of fig. Solution: this is the same pump, same fluid, hence 1 = 2 and d1 = d2. First read the 41. 5-inch bep values as best the writer can: Then get the new rotation rate from the new head, using eq. (11. 28): The flow rate and power follow in like manner: These numbers are slightly uncertain because of the difficulty of reading fig. 111189%;710/;270;21500;1650nrminhftqgal/minpbhp 2221/222222111100100()()(),710(). ()270710270hndnftrnansahndftmin 4303222221113532222221111430430(),(21500)(). ()21500710710430()()()(),(1650)(0. 222). ()1650710qqndgalqansbqgpmndminppndpbhpanscpbhpnd 13,000370p11. 26 would the smallest, or the largest, of the seven taco inc. pumps in fig. Solution: first try the smallest pump, d = 10. 00 in. To scale up to 600 gpm, use the similarity rules for constant d:
