Abstract
A model was developed to select the most effective fan for a perforated ventilation duct, based on the optimumair distribution pattern in the room. The model was formulated in two parts: (1) to predict the airflow performance ofperforated ventilation ducts and to evaluate the outlet air discharge; (2) to determine the balance point between the fanand the duct by assuming their effective outlet areas to be equal. The experiment validated the first part and tested thehypothesis involved in the second part. When compared with the experimental results obtained from three woodenperforated ventilation ducts with aperture ratios of 0.5, 1.0, and 1.5, the model predicted the outlet airflow along the fulllength of a perforated duct operated under turbulent flow with a maximum error of 9%. The assumption of a commoneffective outlet area was valid and the model was extended to determine the balance point operation between the fan andthe perforated duct.
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