室內空氣清淨機效能測試改良與研發
Other Title
Study on the Performance Characteristics of Indoor Air Cleaners
Date Issued
1999-10-31
Date
1999-10-31
Author(s)
DOI
882314B002144
Abstract
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.
Subjects
electrostatic precipitator
particle size
ozone
靜電集塵器
微粒粒徑
臭氧
SDGs
Publisher
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
Type
report
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