Effects of impeller geometry modification on performance of pump as turbine in the urban water distribution network

Mohammad Hassan Shojaeefard and Salman Saremian

Energy, 2022, vol. 255, issue C

Abstract: Nowadays, by increasing energy consumption, micro-scale energy production has received a lot of attention worldwide. Pressure control and electricity generation using existing hydraulic energy are possible by substituting the Soft Pressure Regulation System (SPRS) for a pressure reducing valves (PRV) in urban water distribution network (WDN) pipelines. The economical benefit and short start-up time are unique features of the SPRS that uses a pump as turbine (PAT). In this study, the numerical and experimental results of a single-stage centrifugal pump in direct and reverse working modes were compared and validated. The effect of passage width increasing, adding splitter blades and simultaneous modification of these parameters on improving the hydraulic performance of the PAT in the working range are investigated. Geometric modifications do not have the same effect on hydraulic parameters and efficiency in all operating ranges due to the significant range of flow rate variations in the WDN. Therefore, the statistical analysis was performed to identify the optimum modifications based on the PAT's working time in the specified flow rate ranges. The results show that simultaneous modification of parameters in the range of part-load condition (0.8QBEP) to over-load condition (1.2QBEP) reduces losses while increasing efficiency and power generation.

Keywords: Pump as turbine; Water distribution network; Passage width; Splitter blades; Increase the efficiency; Micro-hydropower (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:255:y:2022:i:c:s0360544222014530

DOI: 10.1016/j.energy.2022.124550

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