Akademik Veri Yönetim Sistemi
Journal of the Faculty of Engineering and Architecture of Gazi University, cilt.39, sa.3, ss.1745-1758, 2024 (SCI-Expanded)
The pumps must operate in their own pipeline. Pipelines with different pressures and flow rates connected to a pumped system from a pipeline header reduce the efficiency of the pumps. This is shown in Figure A. Purpose: This study aims at experimental and numerical analysis by examining the flow rates and energy losses in pumps while jointly operating gravity lines and pumped lines together. Theory and Methods: Every factor that disrupts the flow of a pipeline causes energy loss. Conditions that prevent the flow, especially on a pump fed line, cause the pumps to consume more energy. In this study, pumps and gravity-flow system are operated together in the pipeline header, which provides water transmission to a large city. The investigation analyzes the effects of the gravity-fed lines combined with the pump line at a higher pressure by experimental and numerical studies. In the experimental studies, a high-pressure flow entered the system while the pumps were operating in different scenarios. Then, the flow entering the pump line was cut off by the valve and the pumps were restarted. The results of both cases were compared. The electrical power drawn by the pumps from the electrical network was measured and their efficiency was calculated. The most economical pump groups to be operated for the requested flow rate were listed. The effect of the arrangement of pumps with different characteristics on one another was investigated. After all scenarios, energy and cost calculations were made. Numerical analyses were conducted with the computational fluid dynamics (CFD) method to observe the flows in the pipes. Results: In the experimental studies, it is observed that combining the pumping lines with other lines causes very high energy losses. The calculations made under different scenarios indicate that the same water flow could be achieved reducing costs by 54,95%. In another scenario, it is seen that the pumps could deliver water by consuming 51,5% less energy. In addition, it is concluded that right pumps should be run in order to supply more water instead of running more pumps. As a result of the numerical analysis, the state of the flow in the pipe has been measured. The results of CFD analyses and experimental studies are consistent with each other. Conclusion: An elaborate design and operation of the pumping system is essential to reduce energy loss, to prevent damage to pumps, and to maximize the system efficiency and performance. Otherwise, a high increase by 54,95% in energy and costs might be observed in this study. (Figure Presented).