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Title: Uncertainty Analysis for a Virtual Flow Meter Using an Air-Handling Unit Chilled Water Valve

Abstract

A virtual water flow meter is developed that uses the chilled water control valve on an air-handling unit as a measurement device. The flow rate of water through the valve is calculated using the differential pressure across the valve and its associated coil, the valve command, and an empirically determined valve characteristic curve. Thus, the probability of error in the measurements is significantly greater than for conventionally manufactured flow meters. In this paper, mathematical models are developed and used to conduct uncertainty analysis for the virtual flow meter, and the results from the virtual meter are compared to measurements made with an ultrasonic flow meter. Theoretical uncertainty analysis shows that the total uncertainty in flow rates from the virtual flow meter is 1.46% with 95% confidence; comparison of virtual flow meter results with measurements from an ultrasonic flow meter yielded anuncertainty of 1.46% with 99% confidence. The comparable results from the theoretical uncertainty analysis and empirical comparison with the ultrasonic flow meter corroborate each other, and tend to validate the approach to computationally estimating uncertainty for virtual sensors introduced in this study.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1083401
Report Number(s):
PNNL-SA-91007
BT0201000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
HVAC & R Research, 19(3):335-345
Additional Journal Information:
Journal Name: HVAC & R Research, 19(3):335-345
Country of Publication:
United States
Language:
English

Citation Formats

Song, Li, Wang, Gang, and Brambley, Michael R. Uncertainty Analysis for a Virtual Flow Meter Using an Air-Handling Unit Chilled Water Valve. United States: N. p., 2013. Web.
Song, Li, Wang, Gang, & Brambley, Michael R. Uncertainty Analysis for a Virtual Flow Meter Using an Air-Handling Unit Chilled Water Valve. United States.
Song, Li, Wang, Gang, and Brambley, Michael R. 2013. "Uncertainty Analysis for a Virtual Flow Meter Using an Air-Handling Unit Chilled Water Valve". United States.
@article{osti_1083401,
title = {Uncertainty Analysis for a Virtual Flow Meter Using an Air-Handling Unit Chilled Water Valve},
author = {Song, Li and Wang, Gang and Brambley, Michael R.},
abstractNote = {A virtual water flow meter is developed that uses the chilled water control valve on an air-handling unit as a measurement device. The flow rate of water through the valve is calculated using the differential pressure across the valve and its associated coil, the valve command, and an empirically determined valve characteristic curve. Thus, the probability of error in the measurements is significantly greater than for conventionally manufactured flow meters. In this paper, mathematical models are developed and used to conduct uncertainty analysis for the virtual flow meter, and the results from the virtual meter are compared to measurements made with an ultrasonic flow meter. Theoretical uncertainty analysis shows that the total uncertainty in flow rates from the virtual flow meter is 1.46% with 95% confidence; comparison of virtual flow meter results with measurements from an ultrasonic flow meter yielded anuncertainty of 1.46% with 99% confidence. The comparable results from the theoretical uncertainty analysis and empirical comparison with the ultrasonic flow meter corroborate each other, and tend to validate the approach to computationally estimating uncertainty for virtual sensors introduced in this study.},
doi = {},
url = {https://www.osti.gov/biblio/1083401}, journal = {HVAC & R Research, 19(3):335-345},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 28 00:00:00 EDT 2013},
month = {Sun Apr 28 00:00:00 EDT 2013}
}