Author(s)

R. George & H.J. Sauer, Jr.

Abstract

Accuracy of airflow measurement in air intake ducts R. George* & H.J. Sauer, Jr.^ '(#,WCWE/,,c., J9JJJ Orc&W/mf/ace, ^mYe200 AW Mc%o%, U&44&J7JI Email: roger@optimalinc.com Email: sauer@cc. umr. edu Abstract Concern for indoor air quality has focussed considerable attention on the design and operation of heating, ventilating, and air-conditioning (HVAC) systems. One critical issue is the accurate sensing of the quantity of air entering the system through the outdoor air intake ducting. Maintaining even the minimum desired outside air quantity is particularly troublesome in buildings with variable-air- volume (VAV) type HVAC systems. Most of the recommended strategies require direct sensing and measuring of the quantity of incoming outdoor air. Unfortunately, in HVAC inlet ducting, the necessary straight run for accurate flow measurement with conventional instruments is not available. As a potential solution, multiple probe pitot-tube stations and multiple ther

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