CHARACTERIZATION AND PERFORMANCE OF A PUSH-THROUGH FAN-FILTER UNIT SYSTEM IN MITIGATING HAZE EXPOSURES IN NATURALLY VENTILATED HOSTELS
NG HUI LING GRACELYN
NG HUI LING GRACELYN
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Abstract
A push-through fan-filter unit system is used to address the haze issues in naturally
ventilated hostel rooms. A series of measurements were conducted as three different
experimental studies, which will eventually conclude on the particulate removal
efficiency, thermal comfort and acoustic performance of the fan-filter unit system. The
first study is focused on filtration efficiency testing of MERV 13 filter at 4 different fanfilter
distance (50mm, 100mm, 150mm, and 200mm), with a fixed fan speed to evaluate
the fan-filter unit system performance under unimpeded condition. It was found that
50mm fan-filter distance has the best overall performance. After which, 50mm fan-filter
distance was adopted for the subsequent two field studies in a hostel room and research
room to test its application and feasibility of the fan-filter unit system.
The findings from these studies showed that the I/O ratios for the particulate matter were
in the range of 0.06 to 0.19, significantly lower than the control room study conducted.
This indicates that the push-through fan-filter unit system is effective in removing
particulate matter indoors. Moreover, thermal comfort analysis also found that
temperature and relative humidity were in the acceptable range according to the Adaptive
Comfort Standard by ASHRAE 62.1. Furthermore, the fan-filter unit system generates
acceptable sound levels to its occupants, which is an essential factor to note in a hostel
room application. Hence, the fan-filter unit system is suitable for prolonged use without
disrupting the occupant’s activity.
Nevertheless, the results also suggest other factors that affect the performance of the fanfilter
unit system. The factors are ACH, air velocity through the fan-filter unit system,
indoor sources of pollutants, and deposition rates of particles. They are further discussed
on their implications on the fan-filter unit system’s performance in this study.
Keywords
Building, PFM, Project and Facilities Management, Tham Kwok Wai, 2015/2016 PFM, Acoustics, Actual Haze, Fan Filter Unit System, Filter, Hostels, Indoor to Outdoor Ratios, MERV, Particulate Matter, Thermal Comfort
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Date
2016-07-14
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Dissertation