Comparison of displacement and mixing diffusers
article
In order to compare the performance of different supply diffusers of ventilation air, the airflow pattern, temperature stratification and contaminant dispersion in a furnitured office ventilated by three kinds of air diffuser were numerically investigated. The air diffusers studied in this paper are a quarter-cylinder displacement diffuser on the floor and mixing diffusers (linear and vortex diffusers) on the ceiling. The heat sources in the office are considered to be 50% convective and 50% radiative. The k-e two-equation model of turbulence is employed to predict the turbulent diffusion. The results show that the displacement diffuser provides a rather uniform flow field with low velocity in most areas, and the vertical temperature dfference from floor to ceiling is as high as 6 K. With the linear diffuser, the air velocity is high, and the temperature is uniform both horizontally and vertically. The air velocity generated by the vortex diffuser is moderate. The distributions of the temperature and the contaminant are rather uniform.
Topics
TNO Identifier
282251
Source
Indoor Air, 2, pp. 168-179.
Publisher
Munksgaard
Collation
14 p.
Place of publication
Copenhagen
Pages
168-179
Files
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