Uncertainty analysis of a combined cycle`s circulating water flow rate calculation using the EPRI performance monitoring workstation (PMW)
- Power Technologies Incorportated, Schenectady, NY (United States)
- Delmarva Power and Light Company, Newark, DE (United States)
An uncertainty analysis was undertaken to compare the accuracy of two methods of obtaining circulating water flow rate for Delm arva Power`s Hay Road combined cycle plant in preparation for a cooling tower performance acceptance test. The conventional method of calculating circulating water flow rate for a cooling tower performance acceptance test is by performing a pilot tube traverse of the circulating water, calculating water velocity, and using the circulating water pipe area, calculate water flow. An alternate method is to use a heat balance to calculate condenser heat rejection and use measured circulating water temperature rise through the condenser to calculate flow. A pre-test uncertainty analysis indicated that for Delmarva`s Hay Road facility, circulating water flow rate calculated by the heat balance method would have an uncertainty of less than {plus_minus}1.0%. This is more accurate than the conventional pitot tube traverse method which has an accuracy of {plus_minus}1.5% at best. A post test uncertainty analysis indicated that the actual test uncertainty was {plus_minus}0.72%. The uncertainty in condenser heat rejection was determined to be {plus_minus}0.23%. This low uncertainty is due to the high accuracy test instrumentation at the Hay Road facility and the cycle configuration that allows good isolation for heat rejection determination. The uncertainty analysis capability of EPRI`s Performance Monitoring Workstation software (PMW) was used to evaluate the uncertainty in circulating water flow rate by the heat balance method.
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States); Encor-America, Inc., Mountain View, CA (United States)
- OSTI ID:
- 121534
- Report Number(s):
- EPRI-TR-104241-V3; CONF-940540-VOL.3; TRN: 95:007328-0017
- Resource Relation:
- Conference: 1994 Electric Power Research Institute (EPRI) heat-rate improvement conference, Baltimore, MD (United States), 3-5 May 1994; Other Information: PBD: Jun 1995; Related Information: Is Part Of 1994 EPRI heat-rate improvement conference. Final report, Volume 3; PB: 300 p.
- Country of Publication:
- United States
- Language:
- English
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