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Article: Ecological energetics of tropical intensive green roof
Title | Ecological energetics of tropical intensive green roof | ||||||
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Authors | |||||||
Keywords | Canopy microclimate Ecological energetics Intensive green roof Passive cooling Thermal insulation Tropical green roof | ||||||
Issue Date | 2011 | ||||||
Publisher | Elsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/enbuild | ||||||
Citation | Energy And Buildings, 2011, v. 43 n. 10, p. 2696-2704 How to Cite? | ||||||
Abstract | Few green roof studies cover intensive and tropical types and specific canopy microclimate.Weexamined the ecological energetics of a sky woodland in humid-tropical Hong Kong. Environmental sensors monitored the microclimatic and soil parameters for 14 months. Key biophysical variables of transpiration, wind, light, and through-canopy energy flux are modeled to investigate seasonal and weather effects. The woodland forms a cloistered subcanopy environment with rather stable microclimate. Transpiration and latent heat loss are enhanced by solar radiation and low relative humidity, but less by wind. On sunny days, about 20% of incident solar radiation can reach the soil surface. The canopy reflected more nearinfrared radiation (NIR) than photosynthetically active radiation (PAR), highlighting a hitherto neglected passive-cooling mechanism. The highest transpiration rate occurs in autumn rather than summer due to dry-mild weather. The woodland canopy could reduce 300Wm-2 energy flux into the substrate. The canopy warmed by solar energy transmits heat to subcanopy air. Latent and sensible heat loss in the subcanopy domain is suppressed, thus dampening the passive-cooling effect. The capability of the tropical intensive green roof to reduce temperature is relatively inefficient comparing with temperate region counterparts. The findings could inform design and choice of green roofs. © 2011 Elsevier B.V. All rights reserved. | ||||||
Persistent Identifier | http://hdl.handle.net/10722/139850 | ||||||
ISSN | 2023 Impact Factor: 6.6 2023 SCImago Journal Rankings: 1.632 | ||||||
ISI Accession Number ID |
Funding Information: We would like to acknowledge with gratitude the research grants furnished generously by the China Light and Power Company Limited, Stanley Ho Alumni Challenge Fund, the Government Matching Grant, and the laborious field work assistance kindly provided by Jeannette Liu and W.Y. Wong. | ||||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jim, CY | en_HK |
dc.contributor.author | Tsang, SW | en_HK |
dc.date.accessioned | 2011-09-23T05:58:04Z | - |
dc.date.available | 2011-09-23T05:58:04Z | - |
dc.date.issued | 2011 | en_HK |
dc.identifier.citation | Energy And Buildings, 2011, v. 43 n. 10, p. 2696-2704 | en_HK |
dc.identifier.issn | 0378-7788 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/139850 | - |
dc.description.abstract | Few green roof studies cover intensive and tropical types and specific canopy microclimate.Weexamined the ecological energetics of a sky woodland in humid-tropical Hong Kong. Environmental sensors monitored the microclimatic and soil parameters for 14 months. Key biophysical variables of transpiration, wind, light, and through-canopy energy flux are modeled to investigate seasonal and weather effects. The woodland forms a cloistered subcanopy environment with rather stable microclimate. Transpiration and latent heat loss are enhanced by solar radiation and low relative humidity, but less by wind. On sunny days, about 20% of incident solar radiation can reach the soil surface. The canopy reflected more nearinfrared radiation (NIR) than photosynthetically active radiation (PAR), highlighting a hitherto neglected passive-cooling mechanism. The highest transpiration rate occurs in autumn rather than summer due to dry-mild weather. The woodland canopy could reduce 300Wm-2 energy flux into the substrate. The canopy warmed by solar energy transmits heat to subcanopy air. Latent and sensible heat loss in the subcanopy domain is suppressed, thus dampening the passive-cooling effect. The capability of the tropical intensive green roof to reduce temperature is relatively inefficient comparing with temperate region counterparts. The findings could inform design and choice of green roofs. © 2011 Elsevier B.V. All rights reserved. | en_HK |
dc.language | eng | en_US |
dc.publisher | Elsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/enbuild | en_HK |
dc.relation.ispartof | Energy and Buildings | en_HK |
dc.subject | Canopy microclimate | en_HK |
dc.subject | Ecological energetics | en_HK |
dc.subject | Intensive green roof | en_HK |
dc.subject | Passive cooling | en_HK |
dc.subject | Thermal insulation | en_HK |
dc.subject | Tropical green roof | en_HK |
dc.title | Ecological energetics of tropical intensive green roof | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Jim, CY: hragjcy@hku.hk | en_HK |
dc.identifier.email | Tsang, SW: victsang@hku.hk | en_HK |
dc.identifier.authority | Jim, CY=rp00549 | en_HK |
dc.identifier.authority | Tsang, SW=rp00875 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.enbuild.2011.06.018 | en_HK |
dc.identifier.scopus | eid_2-s2.0-80054797286 | en_HK |
dc.identifier.hkuros | 195116 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-80054797286&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 43 | en_HK |
dc.identifier.issue | 10 | en_HK |
dc.identifier.spage | 2696 | en_HK |
dc.identifier.epage | 2704 | en_HK |
dc.identifier.eissn | 1872-6178 | - |
dc.identifier.isi | WOS:000295297700017 | - |
dc.publisher.place | Switzerland | en_HK |
dc.identifier.scopusauthorid | Jim, CY=7006143750 | en_HK |
dc.identifier.scopusauthorid | Tsang, SW=36926417600 | en_HK |
dc.identifier.citeulike | 9505037 | - |
dc.identifier.issnl | 0378-7788 | - |