The paper introduces the Variable Speed Pump coefficient direct computation that has been implemented in the latest water distribution modelling software. The water distribution simulation packages are often based upon EPANET hydraulic solver that has been developed by employing the Global Gradient Algorithm (GGA). Originally, the computation of the Variable Speed Pumps (VSP) coefficient was an iterative procedure, which could lead to convergence problem. In order to overcome this problem, a direct com-putation algorithm of the VSP coefficient was incorporated into the GGA, giving rise to a complex non-symmetric problem, which was solved by partitioning the original system matrix to lead to the solution of a large symmetrical problem, which size remains more or less the number of demand driven nodes, plus a small non-symmetrical problem, which size equals the number of VSPs. The results of the approach were tested on the benchmark examples. After exhaustive debugging and testing, the algorithm was finally introduced in WaterCAD and WaterGEMS for the purposes of water distribution system analysis.
E.Todini, M.E. Tryby, Z.Y. Wu, T.M. Walski (2007). Direct computation of variable speed pumps for water distribution system analysis. LEIDEN : Taylor and Francis/Balkema.
Direct computation of variable speed pumps for water distribution system analysis
TODINI, EZIO;
2007
Abstract
The paper introduces the Variable Speed Pump coefficient direct computation that has been implemented in the latest water distribution modelling software. The water distribution simulation packages are often based upon EPANET hydraulic solver that has been developed by employing the Global Gradient Algorithm (GGA). Originally, the computation of the Variable Speed Pumps (VSP) coefficient was an iterative procedure, which could lead to convergence problem. In order to overcome this problem, a direct com-putation algorithm of the VSP coefficient was incorporated into the GGA, giving rise to a complex non-symmetric problem, which was solved by partitioning the original system matrix to lead to the solution of a large symmetrical problem, which size remains more or less the number of demand driven nodes, plus a small non-symmetrical problem, which size equals the number of VSPs. The results of the approach were tested on the benchmark examples. After exhaustive debugging and testing, the algorithm was finally introduced in WaterCAD and WaterGEMS for the purposes of water distribution system analysis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
