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• W4292074303 abstract "Parallel pumps are commonly applied in chilled water and hot water systems to handle broad water flow variation. The application of variable frequency drives leaves the sequencing control of parallel pumps a tricky problem, especially if the pumps have various sizes or/and experience various speeds. The objective of this paper is to develop and validate an energy model to optimize the operation of parallel pump systems. First a comprehensive energy model is developed based on the affinity and Kirchhoff Laws. The pump installed head is applied to eliminate the impact of the pump fittings and the drive efficiency is considered to obtain the true electrical power. Then, the energy model is constructed and validated for a parallel pump system, which has three 284 L/s pumps with one as a backup pump and each powered by a 150 kW motor. Finally, the validated model is applied to identify the energy efficient operation. The results reveal that one-pump operation outperforms two-pump operation at lower flow range with the switchover flowrate decreasing from 300 L/s to 240 L/s as the controlled pump installed head varies from a constant setpoint to a reset variable setpoint. Moreover, faulty various speed settings result in the electrical power waste of 20 kW for the lower-speed pump. • An energy model to optimize parallel pumps operation with same or various sizes and speeds • Pump installed head is used to eliminate the impact of pump fittings • VFD and motor efficiencies are considered to obtain the true electrical power • One-pump operation has higher efficiency than two-pump operation at lower flow • Faulty various speed setting among parallel pumps wastes energy" @default.
• W4292074303 created "2022-08-17" @default.
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• W4292074303 date "2022-11-01" @default.
• W4292074303 modified "2023-10-16" @default.
• W4292074303 title "Development, validation and application of an energy model for energy efficient operation of parallel pump systems" @default.
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• W4292074303 doi "https://doi.org/10.1016/j.jobe.2022.105098" @default.
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