Abstract
Air filters for general ventilation have mainly been used to control the concentration of indoor particulate matter. In this study, the pressure differential, test dust capacity, quality factor and operating life of class F8 pleat–plate and multi-bag type chemical fiber filters were evaluated using an air filter performance test system. The results showed that the resistance increase rate of multi-bag filter (0.49 Pa/g·(cm/s)) was lower than that of pleat–plate filter (1.94 Pa/g·(cm/s)), the quality factor of the multi-bag filter was lower than that of pleat–plate filter, and the dust capacity of the multi-bag filter was much higher than that of the pleat–plate filter. The operating life of the multi-bag filter was 8 times as that of the pleat–plate filter with the measured PM2.5 of outdoor. The energy consumption of the pleat–plate filter was 2.2 times that of the multi-bag filter. Analyzing the electron microscope photos after dust loading, the dust depth of pleat–plate filter into filter material was thinner than that of multi-bag filter. The research results could provide data support for the design optimization and selection of ventilation filters and the treatment of the particulate matter in indoor environments.
Highlights
Fine particles have become one of the main pollutants affecting the quality of the indoor and outdoor environment
Quality factor was considered to be adequate as an index of filter performance [26]
The filtration rate and pressure loss of the bag filter are larger than those of the plate filter, which results in higher Qr values compared to the pleat–plate filter and the multi-bag filter (Figure 3)
Summary
Fine particles have become one of the main pollutants affecting the quality of the indoor and outdoor environment. Air filters for general ventilation are the main method to control particulate matter and improve indoor air quality. A few studies have researched the influence of fiber structure, particle characteristics and structural parameters on the performance of air filters. A study has reported that the filtration efficiency of class F7 multi-bag filters was different during the test process due to the electrostatic effect [8]. The efficiency of new filters has gradually increased, offering greater filtration areas, until reaching a maximum value following which there have been no changes [9]. The filter efficiency and pressure drop performance were affected by the diameter, orientation, and distribution of the fibers in an experimental study [13]. Some researchers have discussed the benefits of using a consistent testing method to characterize the aerodynamic and energy performance of FFU, and a method has been proposed for evaluating the lab-measured performance of relatively new fan filter units (FFUs) [15]
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