Simulation of gas distribution networks which become increasingly important to reduce investment and operation costs, requiere a mathematical model of the whole network. Models of such networks consist of large system...
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Simulation of gas distribution networks which become increasingly important to reduce investment and operation costs, requiere a mathematical model of the whole network. Models of such networks consist of large systems of nonlinear equation describing the gas flow in the pipes. Open and closed branched-off networks are calculated by using a Combet-like method that ensures required supply at any point on demand. Friction factors are automatically selected from the most adequate mathematical model to the working pressure range of each network. The diameter and thickness of the pipe is optimized and adjusted to the closest available commertial value, verifying for the pressure drop and gas velocity until the optimal situation occurs using a recurrent procedure. The program includes an exhaustive data bank with co-mmertially available pipe types and characteristics which is internally coded and given in the final design in API and DIN standards. A user-oriented subroutine is included for economical evaluation of the project, based on convex dynamic programming algorithm, which solves the n-dimensional network by succesive solution of d-dimensional (d<
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