Biophysical properties and thermal performance of an intensive green roof

Chi Yung JIM, S.W. TSANG

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

Green roofs have been increasingly enlisted to alleviate urban environmental problems associated with urban heat island effect and stormwater quantity and quality. Most studies focus on extensive green roofs, with inadequate assessment of the complex intensive type, subtropical region, and thermal insulation effect. This study examines the physical properties, biological processes, and thermal insulation performance of an intensive green roof through four seasons. An experimental woodland installed on a Hong Kong building rooftop was equipped with environmental sensors to monitor microclimatic and soil parameters. The excellent thermal performance of the intensive green roof is verified. Even though our site has a 100 cm thick soil to support tree growth, we found that a thin soil layer of 10 cm is sufficient to reduce heat penetration into building. Seasonal weather variations notably control transpiration and associated cooling effect. The tree canopy reduces solar radiation reaching the soil surface, but the trapped air increases air temperature near the soil surface. The substrate operates an effective heat sink to dampen temperature fluctuations. In winter, the subtropical green roof triggers notable heat loss from the substrate into the ambient air, and draws heat upwards from warmer indoor air to increase energy consumption to warm indoor air. This finding deviates from temperate latitude studies. The results offer hints to optimize the design and thermal performance of intensive green roofs. Copyright © 2010 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1263-1274
JournalBuilding and Environment
Volume46
Issue number6
DOIs
Publication statusPublished - Jun 2011

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Roofs
roof
heat
air
Soils
performance
Air
Thermal insulation
indoor air
soil surface
substrate
Transpiration
seasonal variation
subtropical region
heat island
Heat sinks
Substrates
Solar radiation
Heat losses
stormwater

Citation

Jim, C. Y., & Tsang, S. W. (2011). Biophysical properties and thermal performance of an intensive green roof. Building and Environment, 46(6), 1263-1274. doi: 10.1016/j.buildenv.2010.12.013

Keywords

  • Intensive green roof
  • Sky woodland
  • Thermal insulation performance
  • Biophysical properties
  • Energy budget model
  • Energy consumption