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Flow Measurement with Tangential Paddlewheel Flow Meters: Analysis of Experimental Results and in-situ Diagnostics
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Flow measurement is an important part of the analysis of building energy use whenever thermal energy use is being investigated. In a building flow measurements are typically required for the analysis of chilled water, hot water and steam condensate use. In applications where the accumulated or totalized energy use is needed microprocessor-based thermal energy meters, or Btu meters are often used to integrate and display flow and energy data or generate a totalized signal for input into a data acquisition system. In this paper new results from calibration efforts in the LoanSTAR program are presented, including the premature drop-out of magnetic-type tangential paddlewheel sensors, as well as several in-situ diagnostic measures for ascertaining whether or not a flow meter is experiencing turbulent conditions or if a flow sensor's output signal is suffering a degraded signal due to shaft wear.