Effect of aging and soiling on the solar reflectance of high-albedo roofing materials

High-albedo roof coatings (or “Cool coatings”) show potential to aid reflecting solar irradiation from the sun on the surface of building roofs, which in turn keeps the surface temperature of the roof low. This subsequently reduces the heat transferred into the building. However, the high-albedo sur...

Full description

Saved in:
Bibliographic Details
Main Author: Muk, Jerome Jia Wei.
Other Authors: School of Mechanical and Aerospace Engineering
Format: Final Year Project
Language:English
Published: 2013
Subjects:
Online Access:http://hdl.handle.net/10356/54051
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-54051
record_format dspace
spelling sg-ntu-dr.10356-540512023-03-04T18:40:35Z Effect of aging and soiling on the solar reflectance of high-albedo roofing materials Muk, Jerome Jia Wei. School of Mechanical and Aerospace Engineering Wan Man Pun DRNTU::Engineering::Mechanical engineering High-albedo roof coatings (or “Cool coatings”) show potential to aid reflecting solar irradiation from the sun on the surface of building roofs, which in turn keeps the surface temperature of the roof low. This subsequently reduces the heat transferred into the building. However, the high-albedo surface could deteriorate overtime and gradually lose its reflectance due to the accumulation of dirt. This paper aims to investigate the effect of soot, as one of the major environmental elements that causes surface reflectance loss, on how it affects the solar reflectivity of cool coating on roof over time. In this study, cool coatings were applied on 3 different substrate materials which are common roofing construction materials; concrete, bare aluminum and coated aluminum. A laboratory setup was developed to investigate the wet deposition of soot on the surface of the material, from which a linear correlation was observed with decreasing solar reflectance and increasing soot concentration. At a soot concentration of 10 mg/m², an average drop of 15.6% in solar reflectance was observed across the 3 substrates. To identify how periods of rain would be able to wash off soot deposited on the surface of the coating, and hence restoring reflectivity of the surface, another setup was developed to mimic the rainy conditions in Singapore. The soiled surfaces was exposed to an equivalent of 3 months of extreme rainfall in Singapore, which saw an average increase in reflectivity of 5.5% from the soiled state. Bachelor of Engineering (Mechanical Engineering) 2013-06-13T05:58:09Z 2013-06-13T05:58:09Z 2013 2013 Final Year Project (FYP) http://hdl.handle.net/10356/54051 en Nanyang Technological University 79 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::Mechanical engineering
spellingShingle DRNTU::Engineering::Mechanical engineering
Muk, Jerome Jia Wei.
Effect of aging and soiling on the solar reflectance of high-albedo roofing materials
description High-albedo roof coatings (or “Cool coatings”) show potential to aid reflecting solar irradiation from the sun on the surface of building roofs, which in turn keeps the surface temperature of the roof low. This subsequently reduces the heat transferred into the building. However, the high-albedo surface could deteriorate overtime and gradually lose its reflectance due to the accumulation of dirt. This paper aims to investigate the effect of soot, as one of the major environmental elements that causes surface reflectance loss, on how it affects the solar reflectivity of cool coating on roof over time. In this study, cool coatings were applied on 3 different substrate materials which are common roofing construction materials; concrete, bare aluminum and coated aluminum. A laboratory setup was developed to investigate the wet deposition of soot on the surface of the material, from which a linear correlation was observed with decreasing solar reflectance and increasing soot concentration. At a soot concentration of 10 mg/m², an average drop of 15.6% in solar reflectance was observed across the 3 substrates. To identify how periods of rain would be able to wash off soot deposited on the surface of the coating, and hence restoring reflectivity of the surface, another setup was developed to mimic the rainy conditions in Singapore. The soiled surfaces was exposed to an equivalent of 3 months of extreme rainfall in Singapore, which saw an average increase in reflectivity of 5.5% from the soiled state.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Muk, Jerome Jia Wei.
format Final Year Project
author Muk, Jerome Jia Wei.
author_sort Muk, Jerome Jia Wei.
title Effect of aging and soiling on the solar reflectance of high-albedo roofing materials
title_short Effect of aging and soiling on the solar reflectance of high-albedo roofing materials
title_full Effect of aging and soiling on the solar reflectance of high-albedo roofing materials
title_fullStr Effect of aging and soiling on the solar reflectance of high-albedo roofing materials
title_full_unstemmed Effect of aging and soiling on the solar reflectance of high-albedo roofing materials
title_sort effect of aging and soiling on the solar reflectance of high-albedo roofing materials
publishDate 2013
url http://hdl.handle.net/10356/54051
_version_ 1759858305018101760