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Uncertainties for pressure-time efficiency measurements
Norwegian University of Science and Technology (NTNU), Trondheim.
Norwegian University of Science and Technology (NTNU), Trondheim.
Norwegian University of Science and Technology (NTNU), Trondheim.
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2010 (English)In: The 8th International Conference on Hydraulic Efficiency Measurement, 2010Conference paper, Published paper (Other academic)
Abstract [en]

In connection with the pressure-time project at the Norwegian University of Science and Technology and Luleå University of Technology, a number of tests with the pressure-time method have been performed at the Waterpower Laboratory in Trondheim, Norway. The aim is to lower the uncertainty and improve usability of the method. Also a field test at the Anundsjoe power plant in Sweden has been performed. The pressure-time measurement is affected by random uncertainty. To minimize the effect of the random behavior it is found that a correct integration end limit in the integration of the differential pressure is essential. An analysis using 100 different end points for integration show a possible random error as large as 0.6%. A filtration method for finding an appropriate end point is developed and presented. In laboratory, the random behavior of the method can be described since many tests can be performed. During field measurements, this may not be feasible. However, the random uncertainty can be included if the efficiency curve can be described by polynomial regression curves. This method is presented with the Anundsjoe Power Plant measurements.

Place, publisher, year, edition, pages
2010.
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-27801Local ID: 159df440-f221-11df-8b36-000ea68e967bOAI: oai:DiVA.org:ltu-27801DiVA: diva2:1000991
Conference
International Conference on Hydraulic Efficiency Measurement : 21/10/2010 - 23/10/2010
Note
Godkänd; 2010; 20101117 (ponjon)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Output format
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