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Research on the Real World Performance of the Particulate Air Filter for General Ventilation in Air Handling Unit

Author: MaYongLiang
Tutor: LiuJunJie
School: Tianjin University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Ventilation filters Filtration performance Real-time performance monitoring stations Electrostatic effect
CLC: TU834
Type: Master's thesis
Year: 2010
Downloads: 78
Quote: 1
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Abstract

Prominent as outdoor air pollution levels and the quality of living environment, indoor particulate matter pollution problem has aroused wide attention from scholars at home and abroad. General ventilation air filter is widely used in industrial and civil air handling units, plays an important role in the control of particulate matter transmission, improve indoor air quality and reduce indoor personnel exposure to particulate matter. General ventilation air filter the marked performance data is typically obtained in the laboratory standard testing stage, and do not represent the performance of its performance in the actual operation of the real environment. General ventilation and air handling units with the study of the performance of the actual operation of the air filter is particularly important. The subject, starting from the theory, summed filter performance parameters of the theoretical model to analyze the performance parameters influencing factors; actual processing of the air filter of atmospheric aerosol properties are summarized, with a focus on atmospheric aerosols and artificial experimental dust particle size characteristics were compared; discussed the evolution trend of ordinary fiber air filter and electret filter dust holding stage efficiency performance, the initial establishment of the the dust holding stage filter efficiency performance dynamic evolution model. Reference ASHRAE Guideline 26-2008 and ISO / CD 29462 standard build a set of air handling units for general ventilation air filter real-time performance detection system, high degree of automation of the detection system, automatic control instruments and equipment, automatic acquisition and analysis of data, real-time display performance curve to calculate the error and generate reports. Verified by experiments, and the error analysis of the experimental system for the particle counter zero efficiency and zero efficiency of the test system, aerosol uniform system performance. Build a bench on the basis of real-time monitoring of the performance of general ventilation filters in the air handling units. The test results showed that the filter efficiency measurement data relative to the data obtained in the laboratory controlled environment fluctuations in the actual operation of the real and varied environment. With the real-time detection of electrostatic fiber filter efficiency performance curve analysis, we found that the monitoring period due to the deposition of particles on the fiber charge shielding penetrating particles weaken the fiber charge particles and the the fiber chemical reaction and ambient humidity parameters arising from the impact of the fiber surface charge decay its efficiency performance fluctuations in a downward trend. By comparing the same with electrostatic filter samples before and after the efficiency test results in static elimination confirmed with the initial high-efficiency electrostatic fiber filter depends on its strong electrostatic effect trapping mechanism. The measured filter resistance by their own characteristics and deal with the aerosol particle size characteristics affect the performance of the trends. Air filter variability of the actual operation of the influencing factors of its performance in the real environment, making the the filter dust holding stage efficiency model predictions with real-world efficiency performance measured value of the difference. The research projects marked for the correct understanding and analysis of the air filter performance is important.

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