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Article: Modeling the heat diffusion process in the abiotic layers of green roofs
Title | Modeling the heat diffusion process in the abiotic layers of green roofs | ||||||||
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Authors | |||||||||
Keywords | Abiotic layers Evaporative cooling Green roof Heat diffusion Theoretical model Thermal performance Wet porous medium | ||||||||
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. 6, p. 1341-1350 How to Cite? | ||||||||
Abstract | Green roofs have been increasingly installed to alleviate some common environmental problems. The thermal benefit of living vegetation on rooftop has been extensively studied. The individual and joint contribution of the non-living green roof layers, namely soil, rockwool (water storage) and plastic drainage layers, to thermal performance of green roof has seldom been assessed. This study evaluates the insulating and cooling effects of these abiotic materials. A one-dimensional theoretical model was developed to assess the heat diffusion process in the layers. The model was validated with empirical results from three experimental plots. A calibration procedure was successfully applied to determine key model parameters. The model can capture the most critical features of temperature variations and thermal performance of common abiotic green roof materials. The appreciable water-retention capacity of rockwool plays the dual role of supplying water to the soil to enhance evaporative cooling, and increasing the specific heat capacity of the green roof. The plastic drainage sheet with ample air spaces serves as an excellent thermal insulator. The model remains robust despite seasonal and weather variabilities. Our research findings contradict with some researches in the temperate region that the thermal dissipation in green roofs with dense vegetation is lower than thermally insulated bare roofs. The theoretical model could be used to simulate the micro-environmental conditions and predict the thermal performance of different materials to improve green roof design. © 2011 Elsevier B.V. | ||||||||
Persistent Identifier | http://hdl.handle.net/10722/139845 | ||||||||
ISSN | 2023 Impact Factor: 6.6 2023 SCImago Journal Rankings: 1.632 | ||||||||
ISI Accession Number ID |
Funding Information: We would like to thank the anonymous reviewers for valuable suggestions to improve the manuscript, and acknowledge with gratitude the research grants kindly provided by the Hui Oi Chow Trust Fund, Midland Charitable Foundation, and Stanley Ho Alumni Challenge Fund. We gratefully appreciate Cheung Shing Yuk Tong Company for donating the green roof of our experimental site. | ||||||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jim, CY | en_HK |
dc.contributor.author | Tsang, SW | en_HK |
dc.date.accessioned | 2011-09-23T05:58:01Z | - |
dc.date.available | 2011-09-23T05:58:01Z | - |
dc.date.issued | 2011 | en_HK |
dc.identifier.citation | Energy And Buildings, 2011, v. 43 n. 6, p. 1341-1350 | en_HK |
dc.identifier.issn | 0378-7788 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/139845 | - |
dc.description.abstract | Green roofs have been increasingly installed to alleviate some common environmental problems. The thermal benefit of living vegetation on rooftop has been extensively studied. The individual and joint contribution of the non-living green roof layers, namely soil, rockwool (water storage) and plastic drainage layers, to thermal performance of green roof has seldom been assessed. This study evaluates the insulating and cooling effects of these abiotic materials. A one-dimensional theoretical model was developed to assess the heat diffusion process in the layers. The model was validated with empirical results from three experimental plots. A calibration procedure was successfully applied to determine key model parameters. The model can capture the most critical features of temperature variations and thermal performance of common abiotic green roof materials. The appreciable water-retention capacity of rockwool plays the dual role of supplying water to the soil to enhance evaporative cooling, and increasing the specific heat capacity of the green roof. The plastic drainage sheet with ample air spaces serves as an excellent thermal insulator. The model remains robust despite seasonal and weather variabilities. Our research findings contradict with some researches in the temperate region that the thermal dissipation in green roofs with dense vegetation is lower than thermally insulated bare roofs. The theoretical model could be used to simulate the micro-environmental conditions and predict the thermal performance of different materials to improve green roof design. © 2011 Elsevier B.V. | 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 | Abiotic layers | en_HK |
dc.subject | Evaporative cooling | en_HK |
dc.subject | Green roof | en_HK |
dc.subject | Heat diffusion | en_HK |
dc.subject | Theoretical model | en_HK |
dc.subject | Thermal performance | en_HK |
dc.subject | Wet porous medium | en_HK |
dc.title | Modeling the heat diffusion process in the abiotic layers of green roofs | 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.2011.01.012 | en_HK |
dc.identifier.scopus | eid_2-s2.0-79953760328 | en_HK |
dc.identifier.hkuros | 195111 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-79953760328&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 43 | en_HK |
dc.identifier.issue | 6 | en_HK |
dc.identifier.spage | 1341 | en_HK |
dc.identifier.epage | 1350 | en_HK |
dc.identifier.eissn | 1872-6178 | - |
dc.identifier.isi | WOS:000290978900022 | - |
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 | 8759590 | - |
dc.identifier.issnl | 0378-7788 | - |