Influence of the floor-based obstruction on contaminant removal efficiency and effectiveness


States that dilution ventilation is often dimensioned using the perfect mixing approximation, assuming uniform contaminant concentration throughout the room space. However the contaminant removal efficiency and effectiveness of the air conditioning system should be accounted for during the design. States the effectiveness in this context is used as a measure of the contaminant distribution uniformity within the occupied zone. Describes scale-model studies of the influence of an occupied zone obstruction level, air distribution method, air change rate, cooling load and contaminant source non-uniformity on the contaminant removal efficiency and the occupied zone contaminant concentration uniformity. States the room air distribution method results in non-uniformity of the contaminant concentration in the occupied zone. Describes a method developed to take this into account during the design of the air distribution system. States non-uniformity of contaminant supply was found to have great influence on the concentration non-uniformity with two test air distribution methods.

Primary Author(s): Hagstrom K, Zhivov A M, et al

Source: Bldg. Environ., January 2002, vol.37, no.1, 55-66, 13 figs, 2 tabs, 15 refs.

             BSRIA Abstract Doc 000102854 Abs 20020042

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