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- Title
Multiport averaging Pitot tube to measure airflow rates from exhaust fans.
- Authors
Clark, O. G.; Segura, J. C.; Feddes, J. J. R.; Ouellette, C.
- Abstract
Reliable airflow measurements for mechanically-ventilated animal confinement facilities are necessary to accurately determine gas emission rates. Instrumentation for this purpose must, however, be inexpensive, not intrusive, functional in very turbulent airflow, and robust under demanding field conditions. A multiport, averaging Pitot tube was constructed, calibrated in the laboratory using a standardized testing facility, and then tested and refined under simulated and actual field conditions as part of an airflow measurement system. Special features of the measurement system included a flow settling means, downstream orientation of the pressure inlets on the Pitot tube, and a physical filter to dampen pressure fluctuations in the signal line from the Pitot tube to the transducer. The relationship between the measurement signal and air velocity (as measured by traverse with a hot-wire anemometer) was linear (Pearson's correlation coefficient = 0.94) and robust Under simulated and actual field conditions.
- Subjects
AIR flow; VENTILATION; GASES from plants; PITOT tubes; AIR ducts; EXHAUST systems; AIR conditioning; AIR speed; FILTERS &; filtration
- Publication
Canadian Biosystem Engineering Journal, 2008, Vol 50, p5.1
- ISSN
1492-9058
- Publication type
Article