Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/220660
Title: EFFECTS OF VENTILATION RATES IN THE PRESENCE OF FILTER ON OZONE INITIATED CHEMISTRY PRODUCTS IN TROPICAL BUILT ENVIRONMENT THAT USES AIR-CONDITIONERS
Authors: NG GUI QING
Keywords: Building
Tham Kwok Wai
2007/2008 Bu
Issue Date: 9-Jun-2017
Citation: NG GUI QING (2017-06-09). EFFECTS OF VENTILATION RATES IN THE PRESENCE OF FILTER ON OZONE INITIATED CHEMISTRY PRODUCTS IN TROPICAL BUILT ENVIRONMENT THAT USES AIR-CONDITIONERS. ScholarBank@NUS Repository.
Abstract: This study examines the effects of ventilation rates in the presence of filters on ozone initiated chemistry products and the concentrations of secondary organic aerosols (SOAs), in ventilation system and indoor space that utilized recirculation air conditioned mechanical ventilation (ACMV) strategy. The used filter was considered to generate more oxidized- terpenoid and SOA concentrations than the situation with no filter and new filter because of existing dust accumulated on the filter over its servicing periods. And higher ventilation rates which permit larger amounts of outdoor air into indoor space suggested higher production of SOA. The experiments were conducted in a large field environmental chamber (FEC) with two ventilation rates (1 and 2 air change per hour (ACH)) at a constant recirculation rate (14 ACH), and constant emission rate for ozone and limonene, with interchanging filter settings. Multiplexer measurement method determined organic compounds and SOA present in the ventilation system and indoor space at designed experimental period (9 hours). There was evidence for coagulation among particles in the smallest size range particularly at low air exchange rates where longer residence time was available for ozone initiated chemistry to take place. Conversely, air leakages that were suspected could have dissipated ozone and its organic products out of the recirculation loop at high ventilation with high pressure built in the system.
URI: https://scholarbank.nus.edu.sg/handle/10635/220660
Appears in Collections:Bachelor's Theses

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