Study on ageing process of cool coatings in tropical climate

Cool coating is an effective passive cooling technique for reducing the energy consumption of buildings and increasing thermal comfort of occupants. Its thermal performance is determined by two radiative properties, solar reflectance and thermal emittance. However, as cool coating ages, its solar re...

Full description

Saved in:
Bibliographic Details
Main Author: Yang, Xingguo
Other Authors: Wan Man Pun
Format: Theses and Dissertations
Language:English
Published: 2018
Subjects:
Online Access:http://hdl.handle.net/10356/75922
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-75922
record_format dspace
spelling sg-ntu-dr.10356-759222023-03-11T18:04:54Z Study on ageing process of cool coatings in tropical climate Yang, Xingguo Wan Man Pun School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Energy conservation Cool coating is an effective passive cooling technique for reducing the energy consumption of buildings and increasing thermal comfort of occupants. Its thermal performance is determined by two radiative properties, solar reflectance and thermal emittance. However, as cool coating ages, its solar reflectance and thermal emittance change, and consequently its thermal performance degrades. This thesis aims to investigate the ageing process and its effects on cool coatings. In this thesis, the thermal performance and energy saving benefits of cool coating were evaluated by field experiments in Singapore. Natural ageing experiments were conducted in Singapore, to record the changes of solar reflectance and thermal emittance of cool coatings in local environment. Then laboratory-based experiments were designed to quantify the effects of various environmental factors on cool coating, including soiling, cleaning, and ultraviolet (UV) radiation. Mathematical models for the changes of radiative properties of cool coatings during ageing were developed based on the results obtained in this thesis. Then they were embedded into an existing Cool Roof Heat Transfer (CRHT) model to improve the accuracy of heat transfer prediction. It shows that for the net heat gain of a test building for three years, the difference between the results from the two models could be up to 78%. Several kinds of cool coating were tested in this thesis, and it was found that the cool coating would experience less solar reflectance loss during ageing when they have improved surface properties, e.g., smoothness and omniphobicity. Future work such as investigation on soiling deposition rate in local climate could further improve the understanding of the effects of ageing on cool coatings. Doctor of Philosophy (MAE) 2018-08-03T02:27:49Z 2018-08-03T02:27:49Z 2018 Thesis Yang, X. (2018). Study on ageing process of cool coatings in tropical climate. Doctoral thesis, Nanyang Technological University, Singapore. http://hdl.handle.net/10356/75922 10.32657/10356/75922 en 209 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::Energy conservation
spellingShingle DRNTU::Engineering::Mechanical engineering::Energy conservation
Yang, Xingguo
Study on ageing process of cool coatings in tropical climate
description Cool coating is an effective passive cooling technique for reducing the energy consumption of buildings and increasing thermal comfort of occupants. Its thermal performance is determined by two radiative properties, solar reflectance and thermal emittance. However, as cool coating ages, its solar reflectance and thermal emittance change, and consequently its thermal performance degrades. This thesis aims to investigate the ageing process and its effects on cool coatings. In this thesis, the thermal performance and energy saving benefits of cool coating were evaluated by field experiments in Singapore. Natural ageing experiments were conducted in Singapore, to record the changes of solar reflectance and thermal emittance of cool coatings in local environment. Then laboratory-based experiments were designed to quantify the effects of various environmental factors on cool coating, including soiling, cleaning, and ultraviolet (UV) radiation. Mathematical models for the changes of radiative properties of cool coatings during ageing were developed based on the results obtained in this thesis. Then they were embedded into an existing Cool Roof Heat Transfer (CRHT) model to improve the accuracy of heat transfer prediction. It shows that for the net heat gain of a test building for three years, the difference between the results from the two models could be up to 78%. Several kinds of cool coating were tested in this thesis, and it was found that the cool coating would experience less solar reflectance loss during ageing when they have improved surface properties, e.g., smoothness and omniphobicity. Future work such as investigation on soiling deposition rate in local climate could further improve the understanding of the effects of ageing on cool coatings.
author2 Wan Man Pun
author_facet Wan Man Pun
Yang, Xingguo
format Theses and Dissertations
author Yang, Xingguo
author_sort Yang, Xingguo
title Study on ageing process of cool coatings in tropical climate
title_short Study on ageing process of cool coatings in tropical climate
title_full Study on ageing process of cool coatings in tropical climate
title_fullStr Study on ageing process of cool coatings in tropical climate
title_full_unstemmed Study on ageing process of cool coatings in tropical climate
title_sort study on ageing process of cool coatings in tropical climate
publishDate 2018
url http://hdl.handle.net/10356/75922
_version_ 1761781595697577984