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Article: Simulation of thermodynamic transmission in green roof ecosystem

TitleSimulation of thermodynamic transmission in green roof ecosystem
Authors
KeywordsCooling effect
Green roof ecosystem
Multi-layer shield
Radiation shield effectiveness model
Solar radiation
Thermodynamic transmission
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/ecolmodel
Citation
Ecological Modelling, 2010, v. 221 n. 24, p. 2949-2958 How to Cite?
AbstractGreen roofs entail the creation of vegetated space on the top of artificial structures. They can modify the thermal properties of buildings to bring cooling energy conservation and improve human comfort. This study evaluates the thermodynamic transmission in the green roof ecosystem under different vegetation treatments. Our model simulation is based on the traditional Bowen ratio energy balance model (BREBM) and a proposed solar radiation shield effectiveness model (SEM). The BREBM investigates energy absorption of different components of radiation, and the SEM evaluates the radiation shield effects. The proposed model is tested and validated to be efficient to simulate solar energy transmission in green roofs, with some major findings. Firstly, the solar radiation transmission processes might be considered as free vibration motion. Daytime positive heat storage of the green roof is 350-520W·m -2 on an hourly basis. Nighttime or afternoon negative value registers a rather constant magnitude of -60W·m -2. Daily net average is positive around 155-210W·m -2. Secondly, solar radiation vibration is highly correlated with plant structure. The canopy reflectance and transmittance are strongly correlated (R 2=0.87). The multi-layer shrub treatment has the highest shield effectiveness (0.34), followed by two-layer groundcover (0.27), and single-layer grass (0.16). Green roof vegetation absorbs and stores large amounts of heat to form an effective thermal buffer against daily temperature fluctuation. Vegetated roofs drastically depress air temperature in comparison with bare ground (control treatment). Finally, the thermodynamic model is relatively simple and efficient for investigating thermodynamic transmission in green roof ecosystem, and it could be developed into a broad solar radiant land cover model. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/135650
ISSN
2015 Impact Factor: 2.275
2015 SCImago Journal Rankings: 1.098
References

 

DC FieldValueLanguage
dc.contributor.authorHe, Hen_HK
dc.contributor.authorJim, CYen_HK
dc.date.accessioned2011-07-27T01:38:40Z-
dc.date.available2011-07-27T01:38:40Z-
dc.date.issued2010en_HK
dc.identifier.citationEcological Modelling, 2010, v. 221 n. 24, p. 2949-2958en_HK
dc.identifier.issn0304-3800en_HK
dc.identifier.urihttp://hdl.handle.net/10722/135650-
dc.description.abstractGreen roofs entail the creation of vegetated space on the top of artificial structures. They can modify the thermal properties of buildings to bring cooling energy conservation and improve human comfort. This study evaluates the thermodynamic transmission in the green roof ecosystem under different vegetation treatments. Our model simulation is based on the traditional Bowen ratio energy balance model (BREBM) and a proposed solar radiation shield effectiveness model (SEM). The BREBM investigates energy absorption of different components of radiation, and the SEM evaluates the radiation shield effects. The proposed model is tested and validated to be efficient to simulate solar energy transmission in green roofs, with some major findings. Firstly, the solar radiation transmission processes might be considered as free vibration motion. Daytime positive heat storage of the green roof is 350-520W·m -2 on an hourly basis. Nighttime or afternoon negative value registers a rather constant magnitude of -60W·m -2. Daily net average is positive around 155-210W·m -2. Secondly, solar radiation vibration is highly correlated with plant structure. The canopy reflectance and transmittance are strongly correlated (R 2=0.87). The multi-layer shrub treatment has the highest shield effectiveness (0.34), followed by two-layer groundcover (0.27), and single-layer grass (0.16). Green roof vegetation absorbs and stores large amounts of heat to form an effective thermal buffer against daily temperature fluctuation. Vegetated roofs drastically depress air temperature in comparison with bare ground (control treatment). Finally, the thermodynamic model is relatively simple and efficient for investigating thermodynamic transmission in green roof ecosystem, and it could be developed into a broad solar radiant land cover model. © 2010 Elsevier B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/ecolmodelen_HK
dc.relation.ispartofEcological Modellingen_HK
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in <Journal title>. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in PUBLICATION, [VOL#, ISSUE#, (DATE)] DOI#en_US
dc.subjectCooling effecten_HK
dc.subjectGreen roof ecosystemen_HK
dc.subjectMulti-layer shielden_HK
dc.subjectRadiation shield effectiveness modelen_HK
dc.subjectSolar radiationen_HK
dc.subjectThermodynamic transmissionen_HK
dc.titleSimulation of thermodynamic transmission in green roof ecosystemen_HK
dc.typeArticleen_HK
dc.identifier.emailJim, CY:hragjcy@hkucc.hku.hken_HK
dc.identifier.authorityJim, CY=rp00549en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ecolmodel.2010.09.002en_HK
dc.identifier.scopuseid_2-s2.0-77957893935en_HK
dc.identifier.hkuros186575en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77957893935&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume221en_HK
dc.identifier.issue24en_HK
dc.identifier.spage2949en_HK
dc.identifier.epage2958en_HK
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridHe, H=55214930400en_HK
dc.identifier.scopusauthoridJim, CY=7006143750en_HK
dc.identifier.citeulike7938983-

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