Indoor particle dynamics and cognitive performance of occupants in sleeping environments

As people tend to spend most of their time indoors, indoor particle exposures possibly constitute a significant portion of the overall exposure to these harmful particulate matter (PM). Singaporeans spend an average of 6.5 hours sleeping, which takes up more than one quarter of their lifetime. There...

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Main Author: Chai, Ming Sheng
Other Authors: Chang Wei-Chung
Format: Final Year Project
Language:English
Published: 2015
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Online Access:http://hdl.handle.net/10356/64135
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-641352023-03-03T17:06:34Z Indoor particle dynamics and cognitive performance of occupants in sleeping environments Chai, Ming Sheng Chang Wei-Chung School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering As people tend to spend most of their time indoors, indoor particle exposures possibly constitute a significant portion of the overall exposure to these harmful particulate matter (PM). Singaporeans spend an average of 6.5 hours sleeping, which takes up more than one quarter of their lifetime. Therefore, there is a need to measure the indoor air quality (IAQ) of sleeping environments and determine their indoor environmental status. During the conduct of objective assessment, sampling data i.e. PM concentrations and other physical parameters, were collected in four test bedrooms under air-conditioned (AC) and natural ventilation (NV), with fan-assisted conditions. The data were compared with IAQ guidelines under Singapore Ministry of Environment. Generally, the ratios of indoor and outdoor (I/O ratios) particle concentrations in all test bedrooms were less than one under both conditions, with smaller ratios shown in AC condition than in NV condition for both fine and coarse particles. The result seems to show a trend of particle deposition loss-rate coefficient, KD in relative to the air exchange rate. The particle penetration factor, P for both fine and coarse particles were one or close to unity for most of the test sites. As for air-conditioner particle removal efficiency, KAC, the value tends to be greater for particles that were larger in size. Some of the values calculated in this study could be overestimated or underestimated due to the assumptions made of the absence of indoor particle emission and additional particle dynamic processes e.g. resuspension, coagulation of particles used in the model. In subjective assessment, the cognitive performance of occupants seems to show a trend relative to each of their preferred sleeping habit i.e. occupants tend to perform better when they slept in their preferred sleeping environment. The sample size of cognitive test was expanded and the results indicate that most participants showed an improvement in their cognitive tests, which include reaction test (Test 1), memory focus test (Test 2) and visual perception and cognitive skill test (Test 3), after their sleep in both conditions, with an exception of Test 3 under AC condition. Bachelor of Engineering (Environmental Engineering) 2015-05-25T02:41:10Z 2015-05-25T02:41:10Z 2015 2015 Final Year Project (FYP) http://hdl.handle.net/10356/64135 en Nanyang Technological University 82 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering
spellingShingle DRNTU::Engineering::Civil engineering
Chai, Ming Sheng
Indoor particle dynamics and cognitive performance of occupants in sleeping environments
description As people tend to spend most of their time indoors, indoor particle exposures possibly constitute a significant portion of the overall exposure to these harmful particulate matter (PM). Singaporeans spend an average of 6.5 hours sleeping, which takes up more than one quarter of their lifetime. Therefore, there is a need to measure the indoor air quality (IAQ) of sleeping environments and determine their indoor environmental status. During the conduct of objective assessment, sampling data i.e. PM concentrations and other physical parameters, were collected in four test bedrooms under air-conditioned (AC) and natural ventilation (NV), with fan-assisted conditions. The data were compared with IAQ guidelines under Singapore Ministry of Environment. Generally, the ratios of indoor and outdoor (I/O ratios) particle concentrations in all test bedrooms were less than one under both conditions, with smaller ratios shown in AC condition than in NV condition for both fine and coarse particles. The result seems to show a trend of particle deposition loss-rate coefficient, KD in relative to the air exchange rate. The particle penetration factor, P for both fine and coarse particles were one or close to unity for most of the test sites. As for air-conditioner particle removal efficiency, KAC, the value tends to be greater for particles that were larger in size. Some of the values calculated in this study could be overestimated or underestimated due to the assumptions made of the absence of indoor particle emission and additional particle dynamic processes e.g. resuspension, coagulation of particles used in the model. In subjective assessment, the cognitive performance of occupants seems to show a trend relative to each of their preferred sleeping habit i.e. occupants tend to perform better when they slept in their preferred sleeping environment. The sample size of cognitive test was expanded and the results indicate that most participants showed an improvement in their cognitive tests, which include reaction test (Test 1), memory focus test (Test 2) and visual perception and cognitive skill test (Test 3), after their sleep in both conditions, with an exception of Test 3 under AC condition.
author2 Chang Wei-Chung
author_facet Chang Wei-Chung
Chai, Ming Sheng
format Final Year Project
author Chai, Ming Sheng
author_sort Chai, Ming Sheng
title Indoor particle dynamics and cognitive performance of occupants in sleeping environments
title_short Indoor particle dynamics and cognitive performance of occupants in sleeping environments
title_full Indoor particle dynamics and cognitive performance of occupants in sleeping environments
title_fullStr Indoor particle dynamics and cognitive performance of occupants in sleeping environments
title_full_unstemmed Indoor particle dynamics and cognitive performance of occupants in sleeping environments
title_sort indoor particle dynamics and cognitive performance of occupants in sleeping environments
publishDate 2015
url http://hdl.handle.net/10356/64135
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