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Closure to “Dealing with Zero Flows in Solving the Nonlinear Equations for Water Distribution Systems” by Sylvan Elhay and Angus R. Simpson
Publisher: American Society of Civil Engineers
Closure to “Jacobian Matrix for Solving Water Distribution System Equations with the Darcy-Weisbach Head-Loss Model” by Angus Simpson and Sylvan Elhay
Publisher: American Society of Civil Engineers
Evaluating the Approximation of the Affinity Laws and Improving the Efficiency Estimate for Variable Speed Pumps
Publisher: American Society of Civil Engineers
Abstract: Affinity laws relate to the characteristics of pumps operating at different speeds, and in a water distribution context, are usually used to predict the pump curve of variable speed pumps (VSPs). VSPs can adjust the pump ...
Dealing with Zero Flows in Solving the Nonlinear Equations for Water Distribution Systems
Publisher: American Society of Civil Engineers
Abstract: Three issues concerning the iterative solution of the nonlinear equations governing the flows and heads in a water distribution system network are considered. Zero flows cause a computation failure (division by zero) when ...
Pipeline Column Separation Flow Regimes
Publisher: American Society of Civil Engineers
Abstract: A generalized set of pipeline column separation equations is presented describing all conventional types of low-pressure regions. These include water hammer zones, distributed vaporous cavitation, vapor cavities, and shocks ...
Numerical Comparison of Pipe‐Column‐Separation Models
Publisher: American Society of Civil Engineers
Abstract: Results comparing six column‐separation numerical models for simulating localized vapor cavities and distributed vaporous cavitation in pipelines are presented. The discrete vapor‐cavity model (DVCM) is shown to be quite ...
Erratum for “Jacobian Matrix for Solving Water Distribution System Equations with the Darcy-Weisbach Head-Loss Model” by Angus Simpson and Sylvan Elhay
Publisher: American Society of Civil Engineers
Correction of the <i>EPANET</i> Inaccuracy in Computing the Efficiency of Variable Speed Pumps
Publisher: American Society of Civil Engineers
Abstract: One attractive possibility for saving energy in water distribution systems is the introduction of variable speed pumps (VSPs). However, to assess the cost effectiveness of using VSPs, a correct estimate of VSP energy ...
Large Water‐Hammer Pressures for Column Separation in Pipelines
Publisher: American Society of Civil Engineers
Abstract: Water-hammer pressures in a pipeline due to the collapse of a vapor cavity adjacent to a valve are investigated. A water-hammer event is initiated by the closure of a valve in a simple reservoir-pipeline-valve system. The ...
Expert System for Water Treatment Plant Operation
Publisher: American Society of Civil Engineers
Abstract: An expert system based on a combination of forward chaining, backward chaining, and metarules has been developed for water treatment plant operations. The expert system was developed by interviewing a number of plant ...