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Article: Green-roof Effects on Neighborhood Microclimate and Human Thermal Sensation

TitleGreen-roof Effects on Neighborhood Microclimate and Human Thermal Sensation
Authors
Keywordsgreen roof
climate change
cooling effect
human thermal comfort
urban heat island
compact city
sustainable urban design
Issue Date2013
PublisherMDPI, Basel.
Citation
Energies, 2013, v. 6, p. 598-618 How to Cite?
AbstractGreen roofs have been recognized as an effective sustainable design tool to mitigate urban heat island (UHI) effects. Previous studies have identified green-roof benefits in cooling and energy-conservation at the building scale, with limited exploration of the wider influence on neighborhood microclimate and human thermal comfort (HTC). This paper investigated the impacts of community-scale green-roof installation on air temperature and HTC in five typical residential neighborhoods of subtropical Hong Kong. The microclimate models ENVI-met and RayMan permitted studies of two main green-roof scenarios, namely extensive (EGR) and intensive (IGR). Microclimatic monitoring data from a local experimental green-roof site validated the modeling methods. The results verified that green-roof cooling effects were not restricted to rooftops, but extended to the ground to improve neighborhood microclimate. EGR reduced pedestrian-level air temperature by 0.4–0.7 °C, and IGR by 0.5–1.7 °C, with maximum effect in open-set low rise sites. Coverage by building footprints and building height dampened lateral and vertical advection of cool air generated by green roofs. Roof greening also improved notably the rooftop-podium level HTC. Diurnal duration of high heat stress was reduced by 6–9 h for EGR scenarios, and 9–11 h for IGR. The findings indicated that large-scale green-roof installation could bring neighborhood-wide cooling, mitigate urban heat island effect, and furnish more comfortable thermal environment for urban residents.
Persistent Identifierhttp://hdl.handle.net/10722/189529
ISSN
2015 Impact Factor: 2.077
2015 SCImago Journal Rankings: 0.840
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorPeng, Len_US
dc.contributor.authorJim, CYen_US
dc.date.accessioned2013-09-17T14:45:29Z-
dc.date.available2013-09-17T14:45:29Z-
dc.date.issued2013en_US
dc.identifier.citationEnergies, 2013, v. 6, p. 598-618en_US
dc.identifier.issn1996-1073-
dc.identifier.urihttp://hdl.handle.net/10722/189529-
dc.description.abstractGreen roofs have been recognized as an effective sustainable design tool to mitigate urban heat island (UHI) effects. Previous studies have identified green-roof benefits in cooling and energy-conservation at the building scale, with limited exploration of the wider influence on neighborhood microclimate and human thermal comfort (HTC). This paper investigated the impacts of community-scale green-roof installation on air temperature and HTC in five typical residential neighborhoods of subtropical Hong Kong. The microclimate models ENVI-met and RayMan permitted studies of two main green-roof scenarios, namely extensive (EGR) and intensive (IGR). Microclimatic monitoring data from a local experimental green-roof site validated the modeling methods. The results verified that green-roof cooling effects were not restricted to rooftops, but extended to the ground to improve neighborhood microclimate. EGR reduced pedestrian-level air temperature by 0.4–0.7 °C, and IGR by 0.5–1.7 °C, with maximum effect in open-set low rise sites. Coverage by building footprints and building height dampened lateral and vertical advection of cool air generated by green roofs. Roof greening also improved notably the rooftop-podium level HTC. Diurnal duration of high heat stress was reduced by 6–9 h for EGR scenarios, and 9–11 h for IGR. The findings indicated that large-scale green-roof installation could bring neighborhood-wide cooling, mitigate urban heat island effect, and furnish more comfortable thermal environment for urban residents.-
dc.languageengen_US
dc.publisherMDPI, Basel.en_US
dc.relation.ispartofEnergiesen_US
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectgreen roof-
dc.subjectclimate change-
dc.subjectcooling effect-
dc.subjecthuman thermal comfort-
dc.subjecturban heat island-
dc.subjectcompact city-
dc.subjectsustainable urban design-
dc.titleGreen-roof Effects on Neighborhood Microclimate and Human Thermal Sensationen_US
dc.typeArticleen_US
dc.identifier.emailJim, CY: hragjcy@hku.hken_US
dc.identifier.authorityJim, CY=rp00549en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.3390/en6020598-
dc.identifier.hkuros223968en_US
dc.identifier.volume6en_US
dc.identifier.spage598en_US
dc.identifier.epage618en_US
dc.identifier.isiWOS:000315395400003-
dc.publisher.placeSwitzerlanden_US

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