International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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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)
  • Published : 2007.09.30
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Abstract

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.

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References

  1. Ministry of Environment of Korea, 2003, The Act of Indoor Air Qualities for Multiple-Use Facilities, Ministry of Law, Korea
  2. ASHRAE, 1992, ANSI/ASHRAE Standard 55-1992, Thermal Environmental Conditions for Human Occupancy, Atlanta: ASHRAE
  3. Kirkpatrick, A. T. and Knappmiller, K. D., 1996, The ADPI of Cold Air Jets in an Enclosure, ASHRAE Transactions, Vol. 102, No.1, pp. 3-9
  4. Han, H., 1994, Numerical Analysis of Ventilation Effectiveness Using Turbulent Airflow Modeling, J. of Air-Conditioning and Refrigeration, Vol. 2, pp. 41-49