Abstract
Centrifugal pumps are being widely used in many industrial and commercial applications. Many of these pumps are being operated at constant speed but could provide energy savings through adjustable speed operations. The purpose of this study was to get the energy saving rates of the multistage centrifugal pump with variable speed conditions. For this investigation an experimental set up of variable flow and pressure system was made to get energy saving rates and numerical analyses are applied to validate the pump performance. The energy saving and therefore the cost saving depends on the specific duty cycle of which the machine operates. Duty cycle is the proportion of time during which a component, device and system is operated. The duty cycle segmented into different flow rates and weighting the average value for each segment by the interval time. The system was operated at 50% or less of the pump capacity. The input power of the system was carried out by pump characteristics curve of each operating point. The energy consumption was done by the product of specific duty cycle and the input power of the system for constant speed and variable speed drive operation. The total energy consumed for constant speed drive pump was 75,770 kW.hr and for variable speed drive pump was 31,700 kW.hr. The total energy saving of the system was 44,070 kW.hr or 58.16% annually. So, this paper suggests a method of implementing an energy saving on variable-flow and pressure system of the multistage centrifugal pump.
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References
Pumping station engineering hand book, Japan association of agriculture engineering enterprises, Tokyo, pp. 21, (1991)
Robert Fox, Alan T. Mcdonald, Fluid Mechanics, John Wiley and Sons Inc., Asia, pp. 494–541, (2012).
William W. Peng, Fundamentals of Turbo machinery, John Wiley and Sons Inc., Hoboken, NJ, USA, pp.1–6, (2008).
M.L. Hedi, K. Hatem, and Z. Ridha, “Numerical analysis of the flow through in centrifugal pumps”, International Journal of thermal Technology, Vol. 2, No.4.
T. Ahonen et al., “Estimation of pump operational state with model based-methods”, Energy Conversation and Management, Vol. 51, pp.1319–1325, (2010).
Metehan Karaca, Murat Adin, Efficient driving at variable speeds, World Pumps, April 2013.
D. kaya et al., “Energy efficiency in pumps”, Energy Conversation and Management, Vol. 49, pp. 1662–1673, (2008).
Armintor, J.K., and Conners D.P, “Pumping Applications in the Petrolium and Chemical Industrys”, IEEE Transactions on Industry Application, Vol. IA-23, 1, pp.43–48, (1987)
D. Croba, and J.L. Kueny, Numerical Calculation of 2D, “Unsteady Flow in Centrifugal Pumps: Impeller and Volute Interaction”, International Journal for Numerical Methods in fluids, Vol. 22, pp. 467–481, (1996).
Y. K. P. Shum,C. S.Tan, and N. A. Cumpsty, “Impellerdiffuser interaction is a centrifugal compressor”, Journal of Turbomachinery, Vol. 122, no. 4, pp. 777–786 (2000).
A. Akhras, M. El Hajem, J.-Y. Champagne, and R. Morel, “The flow rate influence on the interaction of a radial pump impeller and the diffuser”, International Journal of Rotating Machinery, vol. 10, no. 4, pp. 309–317 (2004).
White, F.M, Viscous Fluid Flow, McGraw Hill, New York, pp. 394–499.
Ansys inc. 2012. ANSYS-CFX (CFX Introduction, CFX Reference guide, CFX Tutorials, CFX-Pre User’s Guide, CFX-Solver Manager User’s Guide, Theory Guide), release 14. 5, USA.
ISO 5198: 1987 (E), Centrifugal, mixed flow and axial pumps-code for hydraulic performance tests-precision class, International Standard.
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Suh, SH., Rakibuzzaman, Kim, KW. et al. A study on energy saving rate for variable speed condition of multistage centrifugal pump. J. Therm. Sci. 24, 566–573 (2015). https://doi.org/10.1007/s11630-015-0824-9
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DOI: https://doi.org/10.1007/s11630-015-0824-9