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Terry Beck, Ph.D., Kansas State University
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Craig Hickman, SPX Cooling Technologies, Inc.
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Bruce Babin, Highland Park High School
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The objectives of this presentation are to quantify the influence of several multiple-path (tee) duct disturbances on volumetric air flow rate measurements using traversing techniques, and to develop guidelines for field technicians to assist them in making more accurate volumetric airflow measurements downstream of diverging tee fittings during test and balance operations. Data are presented to quantify the error caused by the distance from multiple-path disturbances (diverging tees) to a given airflow measurement (traverse) taken in the branch downstream, using both thermal anemometer and Pitot-static probes. The traversing algorithms used were the Log-Tchebycheff (LT) method and Equal Area (EA) method.
