The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition

Owing to exponential increase in world population and high influx of migrants to urban areas, demand for space in form of housing and infrastructure has increased in most urban centers yielding a high number of infrastructural developments requiring clearing of vegetative land cover and replacement...

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Main Author:	Lesado, Makama
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TH Building construction
Online Access:	http://eprints.utm.my/id/eprint/34692/5/MakamaLesadoMFAB2012.pdf
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id	my-utm-ep.34692
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spelling	my-utm-ep.346922018-04-27T01:29:24Z The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition 2012-03 Lesado, Makama TH Building construction Owing to exponential increase in world population and high influx of migrants to urban areas, demand for space in form of housing and infrastructure has increased in most urban centers yielding a high number of infrastructural developments requiring clearing of vegetative land cover and replacement by roofs and paved surfaces. The materials used in most cases have higher absorptive heat capacities than the soil and vegetation they replace resulting in the phenomenon known as Urban Heat Island (UHI) where urban areas are hotter than their surrounding rural areas. In tropical regions where solar radiation intensities are higher and rainfall is all year round, thermal performance of these materials is altered by the climatic conditions. The growing population and rising demand for infrastructure calls for careful evaluation of materials used in the urban fabric as a strategy for the mitigation of the UHI phenomenon. This study was carried out on commonly used roofing materials in Malaysian tropical climate; clay and concrete roof tiles adopting two methodologies for the samples. Full scale testing for concrete tiles measured between 12- 19th April, 2011 and exposure rack method for clay tiles measured 1st- 8th July, 2011. Surface and ambient temperature measurements were taken for seven days each by HOBO U-12 Data loggers on samples which had been exposed for varying durations of above 25years, 15years, 10years and less than one year. Climatic conditions such as relative humidity, air temperature and wind speed were recorded using the Environ Data weather station set- up on the study site of the UTM campus. Analysis was made using measures of descriptive analysis on Microsoft Excel and independent paired sample t-tests were carried out on SPSS software. Results showed that after over 25 years of exposure, maximum surface temperature of concrete tile dropped by 12% while the clay rose by 3.68%. Minimum surface temperature of concrete rose by about 2% and no significant changes were observed in the clay tile at night. Thermal performance evaluation of materials used in the urban fabric is essential as a passive solution to mitigating the negative effects of UHI. 2012-03 Thesis http://eprints.utm.my/id/eprint/34692/ http://eprints.utm.my/id/eprint/34692/5/MakamaLesadoMFAB2012.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:69725?site_name=Restricted Repository masters Universiti Teknologi Malaysia, Faculty of Built Environment Faculty of Built Environment
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TH Building construction
spellingShingle	TH Building construction Lesado, Makama The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition
description	Owing to exponential increase in world population and high influx of migrants to urban areas, demand for space in form of housing and infrastructure has increased in most urban centers yielding a high number of infrastructural developments requiring clearing of vegetative land cover and replacement by roofs and paved surfaces. The materials used in most cases have higher absorptive heat capacities than the soil and vegetation they replace resulting in the phenomenon known as Urban Heat Island (UHI) where urban areas are hotter than their surrounding rural areas. In tropical regions where solar radiation intensities are higher and rainfall is all year round, thermal performance of these materials is altered by the climatic conditions. The growing population and rising demand for infrastructure calls for careful evaluation of materials used in the urban fabric as a strategy for the mitigation of the UHI phenomenon. This study was carried out on commonly used roofing materials in Malaysian tropical climate; clay and concrete roof tiles adopting two methodologies for the samples. Full scale testing for concrete tiles measured between 12- 19th April, 2011 and exposure rack method for clay tiles measured 1st- 8th July, 2011. Surface and ambient temperature measurements were taken for seven days each by HOBO U-12 Data loggers on samples which had been exposed for varying durations of above 25years, 15years, 10years and less than one year. Climatic conditions such as relative humidity, air temperature and wind speed were recorded using the Environ Data weather station set- up on the study site of the UTM campus. Analysis was made using measures of descriptive analysis on Microsoft Excel and independent paired sample t-tests were carried out on SPSS software. Results showed that after over 25 years of exposure, maximum surface temperature of concrete tile dropped by 12% while the clay rose by 3.68%. Minimum surface temperature of concrete rose by about 2% and no significant changes were observed in the clay tile at night. Thermal performance evaluation of materials used in the urban fabric is essential as a passive solution to mitigating the negative effects of UHI.
format	Thesis
qualification_level	Master's degree
author	Lesado, Makama
author_facet	Lesado, Makama
author_sort	Lesado, Makama
title	The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition
title_short	The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition
title_full	The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition
title_fullStr	The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition
title_full_unstemmed	The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition
title_sort	effect of long term exposure on thermal performance of roofing materials in malaysian climatic condition
granting_institution	Universiti Teknologi Malaysia, Faculty of Built Environment
granting_department	Faculty of Built Environment
publishDate	2012
url	http://eprints.utm.my/id/eprint/34692/5/MakamaLesadoMFAB2012.pdf
_version_	1747816236164579328

The effect of long term exposure on thermal performance of roofing materials in Malaysian climatic condition

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