The thermodynamic method of pump testing is examined using the standard equation as a starting point, and realistic uncertainties are apportioned to each term in the equation to indicate the absolute degree of uncertainty required in differential temperature measurement for compatibility with current test codes. This illustrates the value of uncertainty associated with derived flowrate and the improvements in measurements required so that the uncertainty in both efficiency and flowrate fall within prescribed limits.
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References
1.
ISO/DP9906Centrifugal, mixed flow and axial pumps—Code for acceptance test—Engineering Classes I and II, 1989 [former Classes B (ISO 3555) and C (ISO 25480)].
2.
Centrifugal, mixed-flow and axial pumps—Code for hydraulic performance tests—Precision Class, International Organisation for Standardisation, 1987.
3.
GibsonM. R.BrugesE. A.An equation of state for compressed water from 1–1000 bar and 0–150°C. J. Mech. Engng Sci., 1968, 10(4), 319–328.
4.
Ei AgibA. A. R.Principles of the thermodynamic methods of measuring the efficiency of hydraulic machines. NEL report 163, 1964. National Engineering Laboratory, East Kilbride, Glasgow.
5.
ColonF. P.The overall recovery factor in thermometric pump efficiency tests. NEL report 421, 1969. National Engineering Laboratory, East Kilbride, Glasgow.
