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Effect of distance and number of measurement points when determining airflow rates in a conducted fan

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008952.(doi:10.13031/2013.29770)
Authors:   Fernando Estellés, Marta Montero, Eliseo Bustamante, Antonio G Torres, Salvador Calvet
Keywords:   Ventilation, fan, calibration, airflow, poultry

Ventilation flow in livestock houses is a key parameter for many applications, such as the proper design of air conditioning in the farms or the calculation of airborne emissions. One of the most widespread methods for measuring this flow is based on recording the velocity of the air leaving the fans in a duct of known diameter (D). Thus, the overall objective of this work is to determine the airflow of a fan by measuring velocities in a duct attached to it. The effect of the distribution and number of air velocity measurement points and also the length of the duct will be analyzed. A fan of a commercial broiler farm was equipped with a duct with different lengths (0 to 7.5 times the fan diameter). Air velocities in the duct were measured using a hot-wire anemometer. No significant differences were found for the length of the duct and the measurement distance to the fan on the determined airflow. Similarly, the study on the velocity distribution in the duct depending on the distance to the fan resulted in a vertical asymmetric distribution in the vicinity of the fan which is homogenized at approximately 7.5 meters.

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