Evaluation of variable speed pumps in pressurized water distribution systems

Document Type : Research Article


Applied Chemistry Student, Faculty of Chemistry, University of Tabriz


In pressurized water distribution systems, a constant speed pump is often used because of its simplicity. However, constant speed pipes are not easily able to deal with changing demands in water flows. When the demand for the discharge differs from the design discharge, the required demand (discharge and head) could be met by changing the pump speed without making any special changes in the system. Using an electronic drive circuit, the electrical frequency can be changed and the rotation speed of the pump motor can thus be modified. In this study, the application of variable speed pumps in pressurized irrigation systems is investigated. Two pumping station scenarios including a fixed speed pump and a variable speed pump are considered. The results show that using a variable speed pump increases the average pump efficiency by 18.7%. In addition, the variable speed pump system reduces the electrical consumption 57.6 % compared to a fixed speed pump. Therefore, the use of variable speed pumps in pressurized systems is recommended.


Main Subjects

[1] A. Farmani Marzankalateh, H. Oraie 2003. Energy Consumption Management of Electro Pumps. The forth national conference on energy, Ministry of Power, Tehran, Iran (In Persian)
[2] R. Abadia, C. Rocamora, A. Ruiz, H. Puerto, Energy efficiency in irrigation distribution networks, I: Theory. Biosystems Engineering. 101.1: (2008) 21-27. https://doi.org/10.1016/j.biosystemseng.2008.05.013
[3] D.P. Connors, J.D. Robechek, D.A. Jarc, 1982. Adjustable Speed Drive as Application to Centrifugal Pumps. The fourth industrial energy technology conference, Houston, USA.
[4] B. Hanson, Z. Weigand, S. Orloff, Performance of Electric Irrigation Pumping Plants Using Variable Frequency Drives. Journal of Irrigation and Drainage Engineering. 122, 3 (1996) 179-https://doi.org/10.1061/(ASCE)0733-9437(1996)122:3(179)
[5] N. Lamaddalene, J.A. Sagardoy, 2000. Performance analysis of on-demand pressurized irrigation systems. FAO irrigation and drainage paper 59, Rome, 132 p.
[6] M. Fazeli, 2008, Presentation and use from variable speed pumps in irrigation systems. The first seminar on irrigation instrument and equipment, Shahid Abaspur University, Iran, 2008 (In Persian)
[7] M.A. Moreno, Development of a new methodology to obtain the characteristic pump curves that minimize the total cost at pumping stations. Biosystems Engineering. 102, 1, (2008) 95-105. https://doi.org/10.1016/j.biosystemseng.2008.09.024
[8] D. Fernandez-Pacheco, B. Ferrandez-Villena, J. Molina Martinez, A. Ruiz-Canales, Performance indicators to assess the implementation of automation in water user associations: case study in southeast Spain. Agricultural Water Management. 151, 3, (2015) 87–92. https://doi.org/10.1016/j.agwat.2014.11.005
[9] N. Lamaddalene, S. Khila, Energy saving with variable speed pumps in on-demand irrigation systems. Irrig. Sci. 30 (2012) 157-166. https://doi.org/10.1007/s00271-011-0271-7
[10] Z. Raeisian Amiri, A. Parvaresh Rizi, Hydraulic Design and Evaluation of Variable Speed Pumps on Pressurized Irrigation Systems (Case study: Harkalleh-Laali Irrigation System), J. of Water and Soil Conservation, 21(3) (2014) 145-164.
[11] R. Camoirano, G. Dellepiane, Variable frequency drive for MSF desalination plant and associated pumping stations. Conference on Desalination and environment, Santa Magherita, Italy, 182 (2005) 53-65.
[12] Y. Li, J. Du, D.S. Guo, Numerical research on viscous oil flow characteristics inside the rotor cavity of rotary lobe pump. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 41:274 (2019). https://doi.org/10.1007/s40430-019-1781-0
[13] R.J.A. Diaz, R.L. Luque, C.M.T. Cobo, P. Montesinos, E.C. Poyato, Exploring energy saving scenarios for on-demand pressurized Irrigation networks. Biosystems Engineering. 104 (2009) 552-561. https://doi.org/10.1016/j.biosystemseng.2009.09.001
[14] B. Mansuri, F. Salmasi, B. Oghati, Sensitivity analysis for water hammer problem in pipelines. Iranica Journal of Energy & Environment, 5, 2 (2014) 124-131. https://doi.org/10.5829/idosi.ijee.2014.05.02.03
[15] E.B. Wylie, V.L. Streeter, S. Lisheng, (1993). Fluid Transient in Systems. Prentice-Hall, Englewood Cliffs.
[16] A. Ahmadi, A.R. Keramat, Investigation of the junction coupling due to various types of the discrete points in a piping system, 12th International Conference on Computer Methods and Advances in Geomechanics, Goa, India. 2008, 4016-4024.
[17] M.R. Nikpour, A. Hosseinzadeh Dalir, A.H. Nazemi, F. Salmasi, D. Farsadizadeh, Water hammer simulation using experimental and CFD numerical models. Water and Soil Science, University of Tabriz, 21, 2 (2010) 39-50. (In Persian with English abstract)
[18] A. Parsasadr, A. Ahmadi, A.R. Keramat, Water hammer caused by intermittent pump failure in pipe systems including parallel pump groups. International Journal of Engineering, 29, 4 (2016) 444-453, https://doi.org/10.5829/idosi.ije.2016.29.04a.02
[19] F.W. White, (2021). Fluid Mechanics (9th edition), McGraw-Hill, New York.
[20] T. Lee, H. Kim, N. Lee, Performance evaluation of GaN FET-based matrix converters with dv/dt filters for variable frequency drive applications. J. Power Electron. 20 (2020) 844–853. https://doi.org/10.1007/s43236-020-00070-2
[21] A. Ruminski, Examination of Variable Frequency Drive Transformer Copper Cooling Line Failures from Nuclear Power Plants. J Fail. Anal. and Preven. 16 (2016) 310–315. https://doi.org/10.1007/s11668-016-0090-5
[22] P. Ramesh, R. Govarthanan, K. Palanisamy, S. Paramasivam, (2020) Analysis of Grid Parameter Variation with Renewable Energy Sources on Variable Frequency Drive DC Capacitor Reliability. In: Subramanian B., Chen SS., Reddy K. (eds) Emerging Technologies for Agriculture and Environment. Lecture Notes on Multidisciplinary Industrial Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-7968-0_20