Measuring Pump Efficiency: Uncertainty Considerations

[+] Author and Article Information
Noah D. Manring

Mechanical and Aerospace Engineering Department, University of Missouri-Columbia, Columbia, MO 65211ManringN@missouri.edu

J. Energy Resour. Technol 127(4), 280-284 (Apr 12, 2005) (5 pages) doi:10.1115/1.1926311 History: Received March 14, 2003; Revised April 12, 2005

The objective of this paper is to analyze the uncertainty associated with pump efficiency measurements and to determine reasonable confidence intervals for these data. In the past, many industrial sales and some pieces of academic research have been based upon the experimental data of pump efficiencies; yet few have questioned the accuracy of the experimental data and no one has provided a confidence interval which reflects the range of uncertainty in the measurement. In this paper, a method for calculating this confidence interval is presented and it is shown that substantially large confidence intervals exist within the testing results of a pump. Furthermore, it is recommended that these confidence intervals be included with the efficiency data whenever it is reported.

Copyright © 2005 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

A schematic of the power flowing in and out of the pump

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Figure 2

Uncertainty associated with measuring the overall pump efficiency

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Figure 4

Uncertainty associated with measuring the pump volumetric efficiency

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Figure 3

Uncertainty associated with measuring the pump torque efficiency



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