Long-term thermal performance evaluation of green roof system based on two new indexes: A case study in Shanghai area

Yang He, Hang Yu, Akihito Ozaki, Nannan Dong, Shiling Zheng

研究成果: ジャーナルへの寄稿記事

6 引用 (Scopus)

抄録

It's widely accepted that green roof systems exhibit varying thermal performances compared with common roofs, nonetheless, there are lack of indexes to characterize this difference with regards to internal mechanisms. In light of this condition, this paper presents two new indexes, namely insulation factor (φ) and comprehensive temperature regulation factor (β) based on insulation and passive cooling effect of the green roof. In order to predict long-term thermal performance of green roof in Shanghai area, a coupled heat and moisture transfer model is developed and validated by measurement data. Based on this model, green roof thermal performances are simulated under different indoor temperatures, and two indexes under different seasons are calculated. The results demonstrate that φ changes little around the year while β varies greatly. To make clear the variation rule of these two indexes, a sensitivity test is carried out. It's observed that thermal resistance of substrate layer and corresponding common roof are the main influence parameters of φ, while β is affected mostly by leaf area index, surface reflectivity and emissivity of substrate layer and common roof. In practice, these two indexes could be used to evaluate the relative thermal performance of different types of green roof against corresponding common roof.

元の言語英語
ページ(範囲)13-28
ページ数16
ジャーナルBuilding and Environment
120
DOI
出版物ステータス出版済み - 8 1 2017

Fingerprint

Roofs
roof
evaluation
performance
insulation
Insulation
moisture transfer
heat
index
Hot Temperature
substrate
Substrates
emissivity
Heat resistance
regulation
leaf area index
reflectivity
heat transfer
lack
Moisture

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Civil and Structural Engineering
  • Geography, Planning and Development
  • Building and Construction

これを引用

Long-term thermal performance evaluation of green roof system based on two new indexes : A case study in Shanghai area. / He, Yang; Yu, Hang; Ozaki, Akihito; Dong, Nannan; Zheng, Shiling.

:: Building and Environment, 巻 120, 01.08.2017, p. 13-28.

研究成果: ジャーナルへの寄稿記事

@article{6bb822cc395f42769533c6359d836255,
title = "Long-term thermal performance evaluation of green roof system based on two new indexes: A case study in Shanghai area",
abstract = "It's widely accepted that green roof systems exhibit varying thermal performances compared with common roofs, nonetheless, there are lack of indexes to characterize this difference with regards to internal mechanisms. In light of this condition, this paper presents two new indexes, namely insulation factor (φ) and comprehensive temperature regulation factor (β) based on insulation and passive cooling effect of the green roof. In order to predict long-term thermal performance of green roof in Shanghai area, a coupled heat and moisture transfer model is developed and validated by measurement data. Based on this model, green roof thermal performances are simulated under different indoor temperatures, and two indexes under different seasons are calculated. The results demonstrate that φ changes little around the year while β varies greatly. To make clear the variation rule of these two indexes, a sensitivity test is carried out. It's observed that thermal resistance of substrate layer and corresponding common roof are the main influence parameters of φ, while β is affected mostly by leaf area index, surface reflectivity and emissivity of substrate layer and common roof. In practice, these two indexes could be used to evaluate the relative thermal performance of different types of green roof against corresponding common roof.",
author = "Yang He and Hang Yu and Akihito Ozaki and Nannan Dong and Shiling Zheng",
year = "2017",
month = "8",
day = "1",
doi = "10.1016/j.buildenv.2017.04.001",
language = "English",
volume = "120",
pages = "13--28",
journal = "Building and Environment",
issn = "0360-1323",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Long-term thermal performance evaluation of green roof system based on two new indexes

T2 - A case study in Shanghai area

AU - He, Yang

AU - Yu, Hang

AU - Ozaki, Akihito

AU - Dong, Nannan

AU - Zheng, Shiling

PY - 2017/8/1

Y1 - 2017/8/1

N2 - It's widely accepted that green roof systems exhibit varying thermal performances compared with common roofs, nonetheless, there are lack of indexes to characterize this difference with regards to internal mechanisms. In light of this condition, this paper presents two new indexes, namely insulation factor (φ) and comprehensive temperature regulation factor (β) based on insulation and passive cooling effect of the green roof. In order to predict long-term thermal performance of green roof in Shanghai area, a coupled heat and moisture transfer model is developed and validated by measurement data. Based on this model, green roof thermal performances are simulated under different indoor temperatures, and two indexes under different seasons are calculated. The results demonstrate that φ changes little around the year while β varies greatly. To make clear the variation rule of these two indexes, a sensitivity test is carried out. It's observed that thermal resistance of substrate layer and corresponding common roof are the main influence parameters of φ, while β is affected mostly by leaf area index, surface reflectivity and emissivity of substrate layer and common roof. In practice, these two indexes could be used to evaluate the relative thermal performance of different types of green roof against corresponding common roof.

AB - It's widely accepted that green roof systems exhibit varying thermal performances compared with common roofs, nonetheless, there are lack of indexes to characterize this difference with regards to internal mechanisms. In light of this condition, this paper presents two new indexes, namely insulation factor (φ) and comprehensive temperature regulation factor (β) based on insulation and passive cooling effect of the green roof. In order to predict long-term thermal performance of green roof in Shanghai area, a coupled heat and moisture transfer model is developed and validated by measurement data. Based on this model, green roof thermal performances are simulated under different indoor temperatures, and two indexes under different seasons are calculated. The results demonstrate that φ changes little around the year while β varies greatly. To make clear the variation rule of these two indexes, a sensitivity test is carried out. It's observed that thermal resistance of substrate layer and corresponding common roof are the main influence parameters of φ, while β is affected mostly by leaf area index, surface reflectivity and emissivity of substrate layer and common roof. In practice, these two indexes could be used to evaluate the relative thermal performance of different types of green roof against corresponding common roof.

UR - http://www.scopus.com/inward/record.url?scp=85018257912&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85018257912&partnerID=8YFLogxK

U2 - 10.1016/j.buildenv.2017.04.001

DO - 10.1016/j.buildenv.2017.04.001

M3 - Article

AN - SCOPUS:85018257912

VL - 120

SP - 13

EP - 28

JO - Building and Environment

JF - Building and Environment

SN - 0360-1323

ER -