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Distributions of Local Supply and Exhaust Effectiveness according to Room Airflow Patterns  

Han, Hwa-Taik (Department of Mechanical and Automotive Engineering, Kookmin University)
Choi, Sun-Ho (Graduate School, Kookmin University)
Lee, Woo-Won (Graduate School, Kookmin University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.10, no.4, 2002 , pp. 177-183 More about this Journal
A pulsed tracer gas technique is applied to measure the distributions of local mean age and local mean residual-life-time of air in a half-scale experimental chamber, The airflow patterns in the chamber are visualized by a Helium bubble generator for three different exhaust locations. A supply slot is located at the top of a right wall, and an exhaust slot is at either bottom-left (Case 1), bottom-right (Case 2), or top-left (Case 3) location. Results show that the distributions of local mean age and local mean residual-life-time are different from each other, but both of them are closely related to the airflow pattern in the space. Included are discussions on explaining the variations of overall room ventilation effectiveness depending upon airflow rates for three different supply-exhaust configurations.
Ventilation effectiveness; Local mean age; Local mean residual-life-time; Tracer gas technique; Air distribution;
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  • Reference
1 Sandberg, M. and Sjoberg, M., 1983, The Use of Moments for Assessing Air Quality in Ventilated Rooms, Building and Environment, Vol. 18, No. 4, pp.181-197
2 Han, H., Kuehn, T. H. and Kim, Y. I., 1999, Local Mean Age Measurements for Heating, Cooling, and Isothermal Supply Air Conditions, ASHRAE Trans., Vol. 105, Pt. 2, pp. 275-282
3 Faulkner, D., Fisk, W. J., Sullivan, D. P. and Wyon, D. P., 1999, Ventilation efficiencies of Desk-Mounted Task/Ambient Conditioning Systems, Indoor Air, Vol. 9, No. 4, pp. 273-281
4 ASHRAE, 1997, ASHRAE Handbook- Fundamentals, American Society of Heating, Refrigerating, and Air-Conditioning Engineers
5 Han, H., 1992, Numerical Analysis of Ventilation Effectiveness using Turbulent Airflow Modeling, Proc. of Int. Symp. on Room Air Convection and Ventilation Effectiveness, pp. 187-191
6 ASHRAE, 1997, Measuring Air-Change Effectiveness, ANSI/ASHRAE 129-1997, American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Atlanta
7 Yaglou, C. P. and Witheridge, W. N., 1937, Ventilation Requirements, ASHVE Trans., Vol. 42, pp. 423-436