Experimental Study of Energy-Saving Realized with the Improvement of Inner Roughness in Double-Entry Centrifugal Pump

Title & Authors
Experimental Study of Energy-Saving Realized with the Improvement of Inner Roughness in Double-Entry Centrifugal Pump
Lim, Sung-Eun; Sohn, Chang-Hyun; Ryu, Jung-Yup;

Abstract
In this study, we test the effects of the surface roughness on the hydro efficiency of double-suction centrifugal pumps ($\small{Q=70.7m^3/min}$, H = 87 m). The original surface of the impeller and inner casing were coated, resulting in surface-roughness reductions ranging from $\small{100{\sim}110{\mu}m}$ to $\small{0{\sim}0.08{\mu}m}$. We conducted experimental studies to measure the efficiency of the pumps and operating-pump electro energy variations with different surface roughness values. The experimental results showed that the efficiency of the pumps increased by about 0.8~1.79% and the electric energy of the operating pump was reduced by around 4.38 ~ 6.08%. These results indicate that the performance of the pumps depend largely on the surface roughness of the impeller and inner casing, and by reducing the surface roughness, we can improve the efficiency of the pump and reduce costs by reducing the electric energy consumption.
Keywords
Pump Coating;Pump Efficiency;Specific Energy;Surface Roughness;
Language
Korean
Cited by
References
1.
Gulich, J. F., 2014, Centrifugal Pumps, Third Edition, Springer, London New York, pp. 93-152/989-990.

2.
White, F. M., 2009, Fluid Mechanics, Seventh Edition, McGraw-Hill, New York, pp. 369-371.

3.
Ryu, J. Y., Kim, J. H. and Campbell, R., 2006, "Increase Efficiency and Reduce Energy Costs of Pumps due to the Coating," Journal of fluid machinery, Vol. 9, No. 1, pp. 56-65.

4.
Kim, Y. Y., Noe, H. S. and Park, T. J., 2010, "Pump Combination Method of Minimum Specific Energy by Use of Pump Performance Curves," KFMA 2010-012, pp. 35-39.

5.
Varley, F. A., 1961, "Effects of Impeller Design and Surface Roughness on the Performance of Centrifugal Pumps," Proceedings of the Institution of Mechanical Engineers June 1961, Vol. 175, No. 1, pp. 955-989.

6.
Lee, S. Y. and Hong, Y. S., 2007, "Effect of CrSiN Thin Film Coating the Improvement of the Lowspeed Torque Efficiency of HYDRAULIC PISTON Pump," ICMCTF 2007, Vol. 202, No. 4-7, pp. 1129-1134.

7.
Hyosung Pump Manual, Hyosung Heavy Industry.

8.
Kang, S. H., Kim, J. K. and Hong, S. S., 2000, "Pump Operation Performance Evaluation Review using the Thermodynamic Method," Journal of fluid machinery, Vol. 3, No. 3, pp. 25-30.