Influence of Topography, Peak Demand, and Topology on Energy Use Patterns in four Small to Medium-Sized Systems in Ontario, Canada
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The aim of this paper is to characterize the relationship between system characteristics of topography, peak demand, and topology and the energy dynamics of four small to medium-sized water distribution systems in Ontario, Canada. First, previously developed energy indicators were used to evaluate and compare the energy efficiency, energy lost to friction, energy lost to leakage, and the surplus energy of the four systems. The systems had a high energy efficiency ranging from 75 to 94% (leak-free) and 58–70% (leaky). Friction losses comprised 3–22% of the total energy input to the systems. Energy lost to leakage comprised 23–26% of total energy input to the systems. Second, hypothesis testing was used to identify statistically significant correlations between system characteristics and energy use patterns in the system. No statistically significant correlation was found between the standard deviation of node elevation and energy use in the four systems. Hydraulic redundancy and energy use did not have a statistically significant correlation. This is because during a ‘typical’ day of service, the most efficient flow paths are concentrated through the trunk mains rather than in the smaller distribution mains that account for most of the looping and hydraulic redundancy of a system. Correlations between peak hour factor and the energy indicators were near the cut-off p-value level (p < 0.05) so it was not clear if the correlations are statistically significant. Despite this, moderate to high Spearman rank correlation coefficients (−0.6 to +0.8) were calculated for the leaky and leak-free systems.
KeywordsWater distribution systems Energy use Energy efficiency Frictional losses Leakage Topography Peak demand Topology Statistical hypothesis testing Correlation analysis
The authors wish to thank the Natural Science and Engineering Research Council for its financial support of this research.
- Cabrera E, Cobacho R, Hernández E, Pardo MA (2010b) Energy assessment of water networks, a case study. 2010 Water Distribution System Analysis Symposium, Tucson , pp 1168–117919–23 SeptGoogle Scholar
- Cabrera E, Cabrera JE, Soriano J (2013) Towards an Energy Labelling of Pressurized Water Networks. 12th International Conference on Computing and Control for the Water Industry, Procedia Engineering, Perugia, 2–4 Sept 2013, p 209–217Google Scholar
- Cabrera E, Gómez E, Cabrera E Jr, Soriano J, Espert V (2014) Energy assessment of pressurized water systems. J Water Resour Plan Manag 141(8):04014095:1–0401409512Google Scholar
- Ministry of the Environment (2008) Design Guidelines for Drinking Water Systems. Ministry of the Environment, TorontoGoogle Scholar
- Pelli T, Hitz HU (2000) Energy indicators and savings in water supply. J Am Water Works Assoc 92(6):55–62Google Scholar
- Prosser M, Speight V, Filion Y (2015) Sensitivity of Pipe Replacement Schedules to Pipe Roughness and Other Factors. J Wat Resrc Plann and Mgmt ASCE 141(8):04015001:1–0401500111Google Scholar
- Statistics Canada (2011, March 23) Operation and maintenance costs of drinking water plants. Statistics Canada. (http://www.statcan.gc.ca/pub/16-002-x/2011001/part-partie3-eng.htm Accessed on 24 Aug 2016)