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Effect of pressure‐sensitive demand on surge analysis
Traditional water distribution models solve the network problem by considering instantaneous demands lumped as nodal outflows. Such demand‐driven analysis assumes that demands are independent of pressures and can be met under all operating conditions. Under transient conditions, however, the resulting positive‐ or negative‐pressure surges can drastically alter the local pressures and affect the demand magnitude that can be extracted. A pressuresensitive demand representation is needed to assess the effect of pressure changes and produce more accurate transient results. A comparative study of demand formulations for surge analysis showed that the pressure‐insensitive demand assumption is intrinsically inaccurate and tends to overdesign surge protection devices. This overdesign results in unnecessary additional costs but does not necessarily ensure greater safety. The authors conclude that a pressure‐sensitive demand formulation should be used for surge analysis to adequately evaluate both system performance and the ultimate cost of system protection.
Effect of pressure‐sensitive demand on surge analysis
Traditional water distribution models solve the network problem by considering instantaneous demands lumped as nodal outflows. Such demand‐driven analysis assumes that demands are independent of pressures and can be met under all operating conditions. Under transient conditions, however, the resulting positive‐ or negative‐pressure surges can drastically alter the local pressures and affect the demand magnitude that can be extracted. A pressuresensitive demand representation is needed to assess the effect of pressure changes and produce more accurate transient results. A comparative study of demand formulations for surge analysis showed that the pressure‐insensitive demand assumption is intrinsically inaccurate and tends to overdesign surge protection devices. This overdesign results in unnecessary additional costs but does not necessarily ensure greater safety. The authors conclude that a pressure‐sensitive demand formulation should be used for surge analysis to adequately evaluate both system performance and the ultimate cost of system protection.
Effect of pressure‐sensitive demand on surge analysis
Jung, Bong Seog (author) / Boulos, Paul F. (author) / Wood, Don J. (author)
Journal ‐ American Water Works Association ; 101 ; 100-111
2009-04-01
12 pages
Article (Journal)
Electronic Resource
English
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