Abstract
Current methods of making volumetric airflow measurements in the field are prone to a number of known inaccuracies because field technicians are required to take measurements in non-ideal circumstances. These situations are unavoidable due to physical limitations caused by the construction of building duct systems. This usually means that measurements are taken closer to a disturbance than would normally be desirable. It is important that these measurements be accurate and reliable since they are used in the test and balancing procedures associated with HVAC systems designed to meet comfort and air quality requirements. The objectives of this research were (1) to quantify the influence of several duct disturbances on volumetric flow rate measurements and (2) to develop guidelines for field technicians to assist them in making more accurate volumetric airflow measurements in rectangular ducts during test and balance operations. In this article, data are presented that attempt to quantify the error caused by the distance from single-path disturbances (straight ducts, elbows, 60° and 90° transitions) to a given airflow measurement (traverse) location.
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