Abstract
A macroscopic model (Nazaroff and Cass, 1989) was used to predict dust concentration distribution in amechanically ventilated swine nursery room under isothermal flow conditions. Four particle diameter size ranges, 0.5 to0.9, 0.9 to 1.6, 1.6 to 2.8, and 2.8 to 5.0 m, were considered. Effects of dust generation rate, source location, andpresence/absence of obstructions (mock pigs) on dust concentration distribution were evaluated. Predicted results werecompared with experimental data from full-scale laboratory tests. Based on the ASTM (1995) criteria, predicted valuesfor the 0.5 to 0.9, 0.9 to 1.6, and 1.6 to 2.8 m particle size ranges and total dust (0.5 to 5.0 m) agreed well withmeasured values; however, measured values for the 2.8 to 5.0 m size range were higher than predicted values. Sourcelocation significantly (p < 0.05) influenced the dust concentration distribution, whereas dust generation rate andpresence/absence of the mock pigs did not significantly (p < 0.05) influence the dust distribution.
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