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A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort

Open spaces in tropical climates are highly exposed to solar radiation. These conditions will influence the outdoor energy budget, leading to an increased heat island effect and reduced human thermal comfort. Trees, however, can influence the microclimate through radiation control that indirectly re...

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Main Authors: Shahidan, Mohd Fairuz, Mohd Shariff, Mustafa Kamal, Jones, Philip, Salleh, Elias, Abdullah, Ahmad Makmom
Format: Article
Published: Elsevier B. V. 2010
Online Access:http://psasir.upm.edu.my/id/eprint/12669/
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spelling my.upm.eprints.126692014-12-15T07:19:43Z http://psasir.upm.edu.my/id/eprint/12669/ A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort Shahidan, Mohd Fairuz Mohd Shariff, Mustafa Kamal Jones, Philip Salleh, Elias Abdullah, Ahmad Makmom Open spaces in tropical climates are highly exposed to solar radiation. These conditions will influence the outdoor energy budget, leading to an increased heat island effect and reduced human thermal comfort. Trees, however, can influence the microclimate through radiation control that indirectly reduces direct radiation uptake and glare by humans and buildings. This condition affects building energy budget and human thermal comfort. This study compares the effectiveness of Mesua ferrea L. and Hura crepitans L. in shade creation and radiation modification in improving human thermal comfort. The study employed two methods: (i) a field measurement procedure and (ii) a computer-based sun-shading analysis using ECO-TECT. The results from this study indicate that both M. ferrea L. and H. crepitans L. contribute significantly to direct thermal radiation modification below their canopies. The average solar filtration under the tree canopy for M. ferrea L. was 93%, with 5% canopy transmissivity, 6.1% of leaf area index (LAI) and 35% of shade area. For H. crepitans L. the average heat filtration under the canopy was 79%, with transmissivity of 22%, LAI of 1.5 and 52% of shade area. Thus, the study found that M. ferrea L. was more significant as a thermal radiation filter than H. crepitans L., due to the former's denser foliage cover and branching habit. This significant filtration capability contributes to reduce more terrestrial radiation, cooling the ground surfaces by promoting more latent heat, reducing air temperature by promoting more evapotranspiration and effectively improves outdoor thermal comfort in tropical open spaces. Elsevier B. V. 2010-09-15 Article PeerReviewed Shahidan, Mohd Fairuz and Mohd Shariff, Mustafa Kamal and Jones, Philip and Salleh, Elias and Abdullah, Ahmad Makmom (2010) A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort. Landscape and Urban Planning, 97 (3). pp. 168-181. ISSN 0169-2046; ESSN: 1872-6062 10.1016/j.landurbplan.2010.05.008
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
description Open spaces in tropical climates are highly exposed to solar radiation. These conditions will influence the outdoor energy budget, leading to an increased heat island effect and reduced human thermal comfort. Trees, however, can influence the microclimate through radiation control that indirectly reduces direct radiation uptake and glare by humans and buildings. This condition affects building energy budget and human thermal comfort. This study compares the effectiveness of Mesua ferrea L. and Hura crepitans L. in shade creation and radiation modification in improving human thermal comfort. The study employed two methods: (i) a field measurement procedure and (ii) a computer-based sun-shading analysis using ECO-TECT. The results from this study indicate that both M. ferrea L. and H. crepitans L. contribute significantly to direct thermal radiation modification below their canopies. The average solar filtration under the tree canopy for M. ferrea L. was 93%, with 5% canopy transmissivity, 6.1% of leaf area index (LAI) and 35% of shade area. For H. crepitans L. the average heat filtration under the canopy was 79%, with transmissivity of 22%, LAI of 1.5 and 52% of shade area. Thus, the study found that M. ferrea L. was more significant as a thermal radiation filter than H. crepitans L., due to the former's denser foliage cover and branching habit. This significant filtration capability contributes to reduce more terrestrial radiation, cooling the ground surfaces by promoting more latent heat, reducing air temperature by promoting more evapotranspiration and effectively improves outdoor thermal comfort in tropical open spaces.
format Article
author Shahidan, Mohd Fairuz
Mohd Shariff, Mustafa Kamal
Jones, Philip
Salleh, Elias
Abdullah, Ahmad Makmom
spellingShingle Shahidan, Mohd Fairuz
Mohd Shariff, Mustafa Kamal
Jones, Philip
Salleh, Elias
Abdullah, Ahmad Makmom
A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort
author_facet Shahidan, Mohd Fairuz
Mohd Shariff, Mustafa Kamal
Jones, Philip
Salleh, Elias
Abdullah, Ahmad Makmom
author_sort Shahidan, Mohd Fairuz
title A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort
title_short A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort
title_full A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort
title_fullStr A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort
title_full_unstemmed A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort
title_sort comparison of mesua ferrea l. and hura crepitans l. for shade creation and radiation modification in improving thermal comfort
publisher Elsevier B. V.
publishDate 2010
url http://psasir.upm.edu.my/id/eprint/12669/
_version_ 1643825098284597248
score 13.211869

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