Tuesday, 28 June 2016: 9:45 AM-10:45 AM
Research Summit
Chair:
Reinhard Radermacher, Ph.D., University of Maryland
Technical Committee: 01.02 Instruments and Measurements
Sponsor: Publishing and Education Council
This session offers presentations based on a select group of recently published papers from the ASHRAE journal, "Science and Technology in the Built Environment," regarding the influence of single-path and multiple-path duct disturbances on volumetric air flow rate measurements, and the development of guidelines for more accurate volumetric airflow measurements in rectangular ducts during test and balance operations of rectangular ducts during test and balance operations.
1 Effect of Fittings on Volumetric Airflow Measurements (RP-1245): Single-Path Duct Disturbances
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Craig Hickman |
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Terry Beck, Ph.D., Kansas State University |
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Bruce Babin, Highland Park High School |
The objectives of this presentation are to quantify the influence of several single-path 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 in rectangular ducts during test and balance operations. Data are presented that attempt to quantify the error caused by the distance from single-path disturbances (straight ducts, elbows, 60º and 90º transitions) to a given airflow measurement (traverse) location, using both thermal anemometer and Pitot-static probes. The traversing algorithms used were the Log-Tchebycheff (LT) method and Equal Area (EA) method.
2 Effect of Fittings on Volumetric Airflow Measurements (RP-1245): Multiple-Path (tee) Duct Disturbances
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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 |
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.