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A Study on the Evaluation of Air Change Efficiency of Multi-Air-Conditioner Coupled with Ventilation System  

Kwon, Yong-Il (Department of Building Mechanical Engineering, Shinheung College)
Han, Hwa-Taik (School of Mechanical & Automotive Engineering, Kookmin University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.15, no.3, 2007 , pp. 101-107 More about this Journal
Indoor air quality becomes of a concern recently in view of human health. This study investigates the air diffusion performance and the air change efficiency of a classroom, when outdoor air is introduced in two different ways in addition to the heating/cooling operation of a ceiling-mounted heat pump. A CFD analysis has been performed to investigate the effect of the discharge angle of the air jets from the heat pump for both parallel and series types of outdoor air system. It is observed that the series type creates more uniform indoor environment compared to the parallel type in general. It can be concluded the discharge angle should not be larger than 40o for the parallel type, in order not to generate thermal stratification in the room.
Air change efficiency; Four-way-cassette heat pump; Air diffusion performance index;
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  • Reference
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3 ASHRAE, 1992, ANSI/ASHRAE Standard 55-1992, Thermal Environmental Conditions for Human Occupancy, Atlanta: ASHRAE
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