Resumo

MARTINEZ RODRIGUEZ, José Bienvenido. Looped water supply networks are not more expensive (3^rd part). RIHA [online]. 2012, vol.33, n.1, pp. 51-60. ISSN 1680-0338.

As the classical water-supply looped-network optimization problem is mathematically non-convex and multimodal, the resulting solution of most approaches is uncertain in the sense of how close it is to the «best» solution. In many cases, this «best»' or «global» solution is invoked and pursued without a clear understanding of its meaning. This paper discusses what is involved in «global» solutions and the role that pipe flow distribution can play to deal with non-convexity and multimodality in a new context. The author has introduced this new context recently after formulating a new objective function capable of finding that a looped network can be economically more attractive than its related branched one. Therefore, the convenience of an approach dealing with flows and heads, as relevant decision variables, is encouraged in this paper and its advantages enumerated under the new concepts. The entropy approach is studied critically and an example is provided for comparison with the proposed approach.

Palavras-chave : flow distribution; looped networks; network design; optimization; water supply.

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