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논문 기본 정보

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대한설비공학회 International Journal of Air-Conditioning and Refrigeration Journal Of Air-Conditioning and Refrigeration Vol.2
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    초록·키워드

    The ventilation effectiveness is calculated using the definitions of local decay rate and local mean age. A low-Reynolds-number k-ε model is implemented to calculate steady state turbulent velocity distributions, and a step-down method is used to calculate transient concentration distributions. Simulations are carried out for diffuser angles of 45, 90, and 135 degrees in a two-dimensional model of a half-scale office room. The results indicate that the local mean age is a better parameter than the local decay rate to quantify the local ventilation effectiveness. The nominal air change rate based on the assumption of complete mixing of room air does not provide the local ventilation effectiveness information. It is numerically proved that the local mean age distribution obtained from the transient calculation is equivalent to the steady state concentration distribution with homogeneously distributed contaminant sources.

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      UCI(KEPA) : I410-ECN-0101-2009-553-015260550