METHOD OF INCREASING THE EFFICIENCY OF THE WATER SUPPLY NETWORK DUE TO ITS ZONING
DOI:
https://doi.org/10.30837/ITSSI.2023.23.083Keywords:
zoning; water supply network; stochastic model; pressure regulator; excess pressureAbstract
The goal of the work is to use a stochastic model of quasi-stationary modes of water supply network to reduce excess pressure in the water supply network by establishing pressure regulators at the entrances to the selected zones. The subject of research in the article is the optimization of the structure of water supply network by zoning. The article discusses the task of optimal zoning of water supply networks, which consists of two subtasks: allocation in the water supply network of isolated zones of nodes with excess pressure exceeding a given value; calculation of the parameters of pressure regulators installed at the entrances to the selected zones. A method based on the breadth-first search method is proposed for zone selection. The deterministic equivalent of this problem is solved using the Newton and Nelder-Mead methods. As a result of solving this problem, we obtain the minimum required values of the pressures stabilized at the outlets of the regulators and the maximum allowable values of the flow rates through them. To determine the minimum and maximum values of the ranges of flow rates and pressures at the inlets and outlets of the regulator, the forecast of the maximum and minimum water consumption by all categories of consumers in the selected zone is carried out and the problem of optimal load distribution between the pressure regulators is solved. As a result, we obtain a range of changes in the optimal flow rates through the regulator and the values of pressure stabilized at the output of the regulator. Based on this information, the type of regulators is determined that provides the necessary ranges of pressure changes at the inlets and outlets of the regulators for the minimum and maximum predicted costs through the regulator and the minimum allowable pressure at its inlet. The following results were obtained: calculations show that, using zoning and installation of pressure regulators at the inlets to isolated zones of the water supply network of the structure under consideration, it is possible to reduce the mathematical expectation of the total excess pressure in the network by 21%. Conclusions: the paper proposes a mathematical model for the problem of optimal zoning of the water supply network, based on a stochastic model of quasi-stationary modes of its operation, and a method for solving this problem. A computational experiment carried out for a water supply network of a given structure showed that as a result of installing pressure regulators at the entrances to the selected zones, it is possible to increase the efficiency of its operation.
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