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DC Field | Value | Language |
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dc.contributor.author | Wan, Siu Ki (溫紹岐) | en_US |
dc.date.accessioned | 2020-04-29T06:41:06Z | - |
dc.date.available | 2020-04-29T06:41:06Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.citation | Wan, S. K. (2019). Designing a step-simulation device to carry out resuspension tests (Outstanding Academic Papers by Students (OAPS), City University of Hong Kong). | en_US |
dc.identifier.other | ace2019-4749-wsk855 | en_US |
dc.identifier.uri | http://dspace.cityu.edu.hk/handle/2031/9322 | - |
dc.description.abstract | Resuspension of settled dust caused by human activities contributes a considerable portion of human particulate matter (PM) exposure indoors (Ferro et al., 2004; Thatcher and Layton, 1995; Yakovleva et al., 1999). Human stepping on the floor affects the quality of indoor air mainly due to resuspending dust accumulated on the carpet, which classically contain plenty of toxicants, carcinogens and allergens. Poor indoor air negatively influences human respiratory system causing cough and asthma. Dust Particle on the floor may stick to our shoes. Some particles may spread around the enclosure while some may rest on the floor. This final year project is to design a step-simulation device to conduct consistent and walk-induced resuspension test in a specified chamber. The report would focus on describing the design idea, the working principle and some testing results. A step-simulation device has been successfully designed and fabricated from semester A to semester B in 2018-2019. The device are designed to imitate a normal person walking behavior. It is installed in a specified chamber so as to simulate an indoor environment. There are four design criteria that have been followed when the device was developing, which are walking behavior, walking speed, pressure loading, and mechanical system selection. The installation procedure, start-up procedure and dust loading procedure would be mentioned in this report. To make the movement of motion similar to the human walking behavior, programmable logic controller was used. Likewise, speed control valves and a pressure-related regulator were installed to the system so the speed of motion and the pressure loading can be controlled. Moreover, pneumatic system was chosen to be used in lieu of hydraulic system as it will not emit any pollutant during the experiment and it is less complicated to control its motion. From the result of Optical Particle Sizer (OPS), this machine can successfully trigger the resuspension effect. Expectation that his step-simulation device can be used and developed for future studies regarding to resuspension. | en_US |
dc.rights | This work is protected by copyright. Reproduction or distribution of the work in any format is prohibited without written permission of the copyright owner. | en_US |
dc.rights | Access is unrestricted. | en_US |
dc.title | Designing a step-simulation device to carry out resuspension tests | en_US |
dc.contributor.department | Department of Architecture and Civil Engineering | en_US |
dc.description.course | CA4749 Final Year Project | en_US |
dc.description.programme | Bachelor of Engineering (Honours) in Building Services Engineering | en_US |
dc.description.supervisor | Prof. Lai, Alvin | en_US |
Appears in Collections: | OAPS - Dept. of Architecture and Civil Engineering |
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