https://scholars.lib.ntu.edu.tw/handle/123456789/110860
標題: | 室內空氣清淨機效能測試改良與研發 | 其他標題: | Study on the Performance Characteristics of Indoor Air Cleaners | 作者: | 陳志傑 | 關鍵字: | electrostatic precipitator;particle size;ozone;靜電集塵器;微粒粒徑;臭氧 | 公開日期: | 31-十月-1999 | 出版社: | 臺北市:國立臺灣大學公共衛生學院職業醫學與工業衛生研究所 | 摘要: | This study investigates the filtration characteristics of a miniature dual saw-like electrodes electrostatic precipitator (ESP). Parameters such as particle size, rate of airflow through the ESP, voltage of the charge electrode, and discharge polarity were included to study their influence on aerosol penetration through the ESP. Polydispersed and monodispersed particles ranged from 30 nm to 10 mm were used as the challenge aerosols. Experimental results indicated that the aerosol penetration through the ESP decreased (from 96 % to 15 % for 0.3 mm) as the voltage of the discharge electrode increased (from +4 kV to +8 kV) at a flow rate of 30 L/min. At a fixed electrode voltage (+8 kV), aerosol penetration increased from 15 % to 69 % for 0.3 mm particles as the flow rate increased from 30 L/min to 120 L/min. The most penetrating particle size was in the range of 0.25 mm to 0.5 mm depending on the discharge voltage and the flow rate. In general, the most penetrating particle size of the ESP tested was found to become smaller as a decrease in the discharge voltage and/or an increase in the testing flow rate. At the same voltage level but opposite polarity, the aerosol penetration through the ESP with negative corona was lower than that with positive corona. The difference in aerosol penetration was a factor of about 2 between the negative and positive coronas for 0.3 mm particles and this difference was independent of the discharge voltage. Regarding energy conservation, using a negative-polarity ESP was more economical if the same efficiency was required. However, the ozone generated by the ESP with negative polarity was about five times greater than that generated with positive polarity. Therefore, when using an ESP as an indoor air cleaner, a positive corona should be used to limit ozone production. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/4935 | 其他識別: | 882314B002144 | Rights: | 國立臺灣大學公共衛生學院職業醫學與工業衛生研究所 |
顯示於: | 環境與職業健康科學研究所 |
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882314B002144.pdf | 300.78 kB | Adobe PDF | 檢視/開啟 |
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