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Article: Coupling heat flux dynamics with meteorological conditions in the green roof ecosystem

TitleCoupling heat flux dynamics with meteorological conditions in the green roof ecosystem
Authors
KeywordsBowen ratio
Energy budget
Green roof ecosystem
Heat flux dynamics
Meteorological condition
Passive cooling
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/ecoleng
Citation
Ecological Engineering, 2010, v. 36 n. 8, p. 1052-1063 How to Cite?
AbstractGreen roofs can notably modify the thermal properties of the building envelope and adjacent air to bring environmental benefits. This study investigates the heat flux dynamics of the tropical green roof ecosystem to provide a scientific basis for design and management. Green roof experimental plots were established to monitor the total solar radiation, net radiation, and micrometeorological parameters. The data permit calculation of sensible and latent heat fluxes using the Bowen ratio energy balance (BREB) method. The results demonstrated the life cycle characteristics of heat flux components. The dynamic changes of sensible (H), latent (λE) and soil (G) heat fluxes were denoted by single-peak quadratic curves. Net radiation (R n) was largely determined by quantity and variation trends of λE, reaching at 1300 h a maximum λE of 655 W m -2 and maximum H of 369 W m -2. Temporal heat-flux fluctuations were strongly correlated with meteorological variables. Extreme values of H and λE correlated well with precipitation and temperature (R 2 = 0.78). Dynamics of heat-flux magnitude and partitioning demonstrated notable differences by daily and season periods. They displayed considerable variations in flux partitioning, with Bowen ratios strongly correlated with weather conditions and vegetation types. The energy budget of the green roof ecosystem is unbalanced with a heat loss of about 15.5% caused by soil and canopy heat reserve. The passive indoor cooling effect under the green roof is attributed to the unbalanced energy closure. © 2010 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/141894
ISSN
2015 Impact Factor: 2.74
2015 SCImago Journal Rankings: 1.112
ISI Accession Number ID
Funding AgencyGrant Number
Midland Charitable Foundation
Hui Oi Chow Trust Fund
Stanley Ho Alumni Challenge Fund
Funding Information:

We acknowledge with gratitude the grants kindly provided by the Midland Charitable Foundation, the Hui Oi Chow Trust Fund and the Stanley Ho Alumni Challenge Fund. The sponsorship of green roof installation by the Cheung Shing Yuk Tong Company Limited is gratefully appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorJim, CYen_HK
dc.contributor.authorHe, Hen_HK
dc.date.accessioned2011-09-30T07:31:45Z-
dc.date.available2011-09-30T07:31:45Z-
dc.date.issued2010en_HK
dc.identifier.citationEcological Engineering, 2010, v. 36 n. 8, p. 1052-1063en_HK
dc.identifier.issn0925-8574en_HK
dc.identifier.urihttp://hdl.handle.net/10722/141894-
dc.description.abstractGreen roofs can notably modify the thermal properties of the building envelope and adjacent air to bring environmental benefits. This study investigates the heat flux dynamics of the tropical green roof ecosystem to provide a scientific basis for design and management. Green roof experimental plots were established to monitor the total solar radiation, net radiation, and micrometeorological parameters. The data permit calculation of sensible and latent heat fluxes using the Bowen ratio energy balance (BREB) method. The results demonstrated the life cycle characteristics of heat flux components. The dynamic changes of sensible (H), latent (λE) and soil (G) heat fluxes were denoted by single-peak quadratic curves. Net radiation (R n) was largely determined by quantity and variation trends of λE, reaching at 1300 h a maximum λE of 655 W m -2 and maximum H of 369 W m -2. Temporal heat-flux fluctuations were strongly correlated with meteorological variables. Extreme values of H and λE correlated well with precipitation and temperature (R 2 = 0.78). Dynamics of heat-flux magnitude and partitioning demonstrated notable differences by daily and season periods. They displayed considerable variations in flux partitioning, with Bowen ratios strongly correlated with weather conditions and vegetation types. The energy budget of the green roof ecosystem is unbalanced with a heat loss of about 15.5% caused by soil and canopy heat reserve. The passive indoor cooling effect under the green roof is attributed to the unbalanced energy closure. © 2010 Elsevier B.V. All rights reserved.en_HK
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/ecolengen_HK
dc.relation.ispartofEcological Engineeringen_HK
dc.subjectBowen ratioen_HK
dc.subjectEnergy budgeten_HK
dc.subjectGreen roof ecosystemen_HK
dc.subjectHeat flux dynamicsen_HK
dc.subjectMeteorological conditionen_HK
dc.subjectPassive coolingen_HK
dc.titleCoupling heat flux dynamics with meteorological conditions in the green roof ecosystemen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0925-8574&volume=36&issue=8&spage=1052–1063&epage=&date=2010&atitle=Coupling+heat+flux+dynamics+with+meteorological+conditions+in+the+green+roof+ecosystem-
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.ecoleng.2010.04.018en_HK
dc.identifier.scopuseid_2-s2.0-77953129430en_HK
dc.identifier.hkuros171878-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77953129430&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume36en_HK
dc.identifier.issue8en_HK
dc.identifier.spage1052en_HK
dc.identifier.epage1063en_HK
dc.identifier.eissn1872-6992-
dc.identifier.isiWOS:000279744600009-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridJim, CY=7006143750en_HK
dc.identifier.scopusauthoridHe, H=55214930400en_HK
dc.identifier.citeulike7287986-

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