Energy saving rates for a multistage centrifugal pump with variable speed drive
Abstract
Multistage centrifugal pumps with variable speed drives are currently widely used in a variety of industrial and commercialapplications. However, there are limitations to defining the efficiency of variable speed drive pumps. As an alternative method,energy saving rates can be evaluated with flow patterns and mean duty cycles. Computational fluid dynamics (CFD) is beingused as a good tool to understand this and is less time consuming in terms of analyzing performances the experimentalmethod. Research attention was focused on the energy saving rates of a multistage centrifugal pump for variable flow withvariable speed drive through numerical and experiment methods. For this investigation Reynolds-averaged Navier-Stokes(RANS) equations were discretized by the finite volume method and a two equations SST model was used to account forthree dimensional steady state flows. In the experimental system, an experimental set-up of a variable flow system was madeto obtain energy saving rates and computational results were validated. The energy saving rates of the pumps depend on theflow patterns and specific mean duty cycles on which the machine or system operates. Mean duty cycles were divided intodifferent flow operating conditions and a weighting for the mean value was given for each segment according to interval time.The pump system was operated at 5070% of maximum flow rates. The energy saving rates were obtained from input powerthrough CFD simulation and experimentally, and the mean duty cycle was obtained from flow patterns in the field of the pump.Energy saving rates were evaluated as a function of mean duty cycle and input power of the system operation. The total energyconsumed for the constant speed drive was 25,922 kWh and for the variable speed drive pump was 17,687 kWh through CFD.The total annual energy saving rates were annually 33.81% through computational and 31.77% through experimental methodwith the variable speed drive system when compared to the constant speed drive system.References
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method by multistage pump using CFD, in: Proceedings of the KFMA
Annual Meeting, Wiley Online Library, 2014, pp. 101–102.
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by impeller trimming, Desalination 249 (2) (2009) 654–659.
[5] S. Kim, Y.-S. Choi, J.-Y. Yoon, D.-S. Kim, Design optimization of centrifugal
pump impeller using DOE, Journal of Fluid machinery 11 (3)
(2008) 36–42.
[6] J. L. Parrondo-Gayo, J. Gonzalez-Perez, J. Fernandez-Francos, The
effect of the operating point on the pressure fluctuations at the blade
passage frequency in the volute of a centrifugal pump, Journal of Fluids
Engineering 124 (3) (2002) 784–790.
[7] J. Lee, N. Hur, I. Yoon, Numerical study of a centrifugal pump performance
with various volute shape, Journal of computational fluids
engineering 20 (3) (2015) 35–40.
[8] B. Jafarzadeh, A. Hajari, M. Alishahi, M. Akbari, The flow simulation of
a low-specific-speed high-speed centrifugal pump, Applied Mathematical
Modelling 35 (1) (2011) 242–249.
[9] M.-H. Lim, B.-W. Ahn, B.-G. Kim, Put investigation on the energy
saving method using inverter driving for cooling pump at mmu training
ship, Journal of the Korean Society of Marine Engineering 33 (6)
(2009) 880–885.
[10] S.-H. Kim, J.-H. Kim, C.-Y. Jang, K.-d. Song, The analysis of life cycle
cost and cooling water circulating pump energy saving according to
variable speed pressure differential setpoint control strategy, KIEAE
Journal 15 (4) (2015) 37–43.
[11] S.-H. Suh, H.-H. Kim, R. Rakibuzzaman, K.-W. Kim, I.-S. Yoon, A
study on the performance evaluation of variable-speed drive pump,
The KSFM Journal of Fluid Machinery 17 (5) (2014) 83–88.
[12] N. Sakthivel, V. Sugumaran, B. B. Nair, Comparison of decision treefuzzy
and rough set-fuzzy methods for fault categorization of monoblock
centrifugal pump, Mechanical systems and signal processing
24 (6) (2010) 1887–1906.
[13] S.-H. Suh, K.-W. Kim, H.-H. Kim, I. S. Yoon, M.-T. Cho, et al., A study
on energy saving rate for variable speed condition of multistage centrifugal
pump, Journal of Thermal Science 24 (6) (2015) 566–573.
[14] J. Tolvanen, Saving energy with variable speed drives, World pumps
2008 (501) (2008) 32–33.
[15] A. T. de Almeida, F. J. Ferreira, D. Both, Technical and economical
considerations in the application of variable-speed drives with electric
motor systems, IEEE Transactions on Industry Applications 41 (1)
(2005) 188–199.
[16] S. Wang, J. Burnett, Online adaptive control for optimizing variablespeed
pumps of indirect water-cooled chilling systems, Applied Thermal
Engineering 21 (11) (2001) 1083–1103.
[17] D. Croba, J. Kueny, Numerical calculation of 2d, unsteady flow in centrifugal
pumps: impeller and volute interaction, International Journal
for Numerical Methods in Fluids 22 (6) (1996) 467–481.
[18] J. K. Armintor, D. P. Connors, Pumping applications in the petroleum
and chemical industries, IEEE transactions on industry applications
IA-23 (1) (1987) 37–48.
Published
2017-07-21
How to Cite
RAKIBUZZAMAN, Md et al.
Energy saving rates for a multistage centrifugal pump with variable speed drive.
Journal of Power Technologies, [S.l.], v. 97, n. 2, p. 163--168, july 2017.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/890>. Date accessed: 21 dec. 2024.
Issue
Section
ICCHMT 2016 Cracow
Keywords
Centrifugal pumps, Variable speed drive, Energy saving rates, Mean duty cycle, CFD simulation
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