| Summary: | 碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 98 === Although Taiwan has been strengthened the labor inspection in recent years, but still occurred numerous of occupational injuries. About 2.89 per incident caused casualties the death toll of about 1.36, harmful gas poisoning which occurred most cases of occupational injuries. The most common gas control approach is used of ventilation、 confined space work-related guidelines、regulations、standards、notwithstanding the provisions of the ventilation and other procedures to be implemented, but the ventilation method that is no related to the implementation of guidelines for reference.
In this study, using computational fluid dynamics and different geometric proportions of the confined space, with the duct elevation, saturation concentration of pollutants, and ventilation duct eccentricity to simulate, identify pollutants and flow of fresh air distribution, and further compare related variables, to find out effective ventilation methods.
The results showed that ventilation increased to 60ACH by the 40ACH, pollutant removal efficiency gradually slow down. Changing model proportions and duct eccentricity ratio will cause a considerable difference distribution trend of the overall flow field, duct is not closer to the bottom, the pollutant removal efficiency will be better, greater eccentricity does not cause the accumulation of contaminants, because of toluene specific gravity is heavier than air, concentrations were quite different in height and location, Therefore, using a mix factor K and the concentration of half-life, and can not really showing a pollutant removal efficiency.
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