期刊刊名：黎明學報 　 卷期：26卷1期

篇名出版日期：2015年1月31日

作者：吳宗泰,Chung-Tai Wu

語言：English

關鍵字：ASHRAE Standard 62.1, mixing effectiveness, stratification, ventilation effectiveness,美國冷熱空調工程協會第62.1規格,混合效應,成層,通風效應

被點閱次數：9次

閱讀時間：524sec

摘要：
ASHRAE Standard 62.1 is a short and often misinterpreted document outlining ventilation requirements for acceptable indoor air quality. The purpose of ASHRAE Standard 62.1 is to specify minimum ventilation rates and indoor air quality that will be acceptable to human occupants and are intended to minimize the potential for adverse health effects. Ventilation code enforcement has been difficult because it is often misunderstood by the code enforcement agency in the local jurisdiction. Present motivation to follow the standard has been driven mostly by liability and risk management concerns. The desire of most design professionals is to meet the minimum obligation of required standards rather than the actual performance of ventilation. This paper addresses two aspects that affect ventilation, imperfect mixing and transient occupancy. Imperfect mixing (or stratification) is the short-circuiting of supplied outdoor air from the diffuser to the exhaust, hence low ventilation effectiveness. When carbon-dioxide (CO2) concentration level is used as an indicator of air quality, transient occupancy makes indoor CO2 concentrations unsteady and difficult to control.

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