| Summary: | 碩士 === 國立臺北科技大學 === 冷凍與低溫科技研究所 === 90 === Draft can be defined as an unwanted feeling owing to locally convective cooling of human body caused by air movement. Usually, it is one of the main reasons to make people feel uncomfortable in an air-conditioning environment. Therefore, the discomfort caused by draft has close relation with people’s sensation on the indoor airflow characteristics. According to the studies of American and European countries, it is known that the main factors to cause draft include mean velocity, mean temperature, turbulence intensity, direction and fluctuating frequency of airflow. When the airflow frequency of fluctuation falls between 0.2 and 0.6Hz, the extent of discomfort caused by draft reaches the maximum. In this study, experimental results regarding to the distribution of airflow frequency of fluctuation generated by the split-type air-conditioner is discussed. Also, the relation of fluctuating frequency of airflow and draft is outlined. According to the experimental investigation, most frequency of fluctuation falls in the range of discomfort. In addition, both theoretical and CFD methods are used to investigate the sensation of people’s skin temperature on the changes of environmental temperatures. The relation of the change of skin temperature and thermal comfort is also discussed.
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