Green-Roof Effects on Neighborhood Microclimate and  Human Thermal Sensation

Peng, Lilliana L.H.; Jim, Chi Yung

doi:10.3390/en6020598

Cited by 196 publications

(120 citation statements)

References 28 publications

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“…[52]. However, previous studies such [52], [53] have found 1-2°C temperature reduction with green-roofs.…”

Section: E Green-roof Casementioning

confidence: 68%

Quantifying the Impact of Green-Roofs on Urban Heat Island Mitigation

Sahnoune¹,

Benhassine²

2017

IJESD

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Abstract-Climate change is one of the main concerns of our times, and it became even more noticeable due to its impact on global temperature, precipitation patterns, and even arctic sea ice melting. Moreover, it has been proven that climate change is one of the main factors affecting the Urban Heat Island (UHI); which in its turn, increases the energy demand in sustainable cities, where reducing power costs still a major challenge. Furthermore, in order to keep a balanced environment, and contribute to temperature mitigation, the use of vegetation cover is definitely one remarkable strategy. It helps decreasing the temperature down to the values required in sustainable development, reducing energy consumption, and lowering Greenhouse Emission (GHE). In this work, we assess the impact of green-roofs on UHI, and we try to define a decision model that helps calculating the best green-roof/green-infrastructure ratio. Besides, we aim to identify the best practices and measures to take in order to mitigate the UHI in semi-arid climate areas.Our work involves the use of a Geographic Information System (GIS), which provides a support to estimate the greenery conditions. Our methodology is based on a probabilistic and comparative approach, and evaluated using different green-roof models. We select a residential area in Constantine, Algeria as our study subject, and we use ENVI-met as the software support. Among the findings of this study, providing proper, yet experimentally proven recommendations on how, how much and where to use green roofs, was our main contribution. In addition, the results of our study indicate not only the impact of green-roofs on UHI, but also the effect of large-scale green-roof installation on the liveable areas in sustainable cities.Index Terms-Climate change, geographic information system, green-roofs, sustainable development, urban heat island.

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“…[52]. However, previous studies such [52], [53] have found 1-2°C temperature reduction with green-roofs.…”

Section: E Green-roof Casementioning

confidence: 68%

Quantifying the Impact of Green-Roofs on Urban Heat Island Mitigation

Sahnoune¹,

Benhassine²

2017

IJESD

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“…International efforts against global warming are advancing, with the Paris Accord [6], The shading of the building reduces the cooling load [42,43]. The green rooftop has been investigated as a means of lowering building temperatures [44]. PV panels also provide shade and produce energy at the same time [45].…”

Section: Introductionmentioning

confidence: 99%

NPC Based Design Optimization for a Net Zero Office Building in Hot Climates with PV Panels as Shading Device

et al. 2018

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Hot areas of the world receive a high amount of solar radiation. As a result, buildings in those areas consume more energy to maintain a comfortable climate for their inhabitants. In an effort to design net-zero energy building in hot climates, PV possesses the unique advantage of generating electrical energy while protecting the building from solar irradiance. In this work, to form a net-zero energy building (NZEB), renewable resources such as solar and wind available onsite for an existing building have been analyzed in a hot climate location. PV and wind turbines in various configurations are studied to form a NZEB, where PV-only systems offer better performance than Hybrid PV Wind systems, based on net present cost (NPC). The self-shading losses in PV placed on rooftop areas are analyzed by placing parallel arrays of PV modules at various distances in between them. The effect on building cooling load by rooftop PV panels as shading devices is investigated. Furthermore, self-shading losses of PV are compared by the savings in cooling loads using PV as shading. In the case study, 12.3% saving in the cooling load of the building is observed when the building rooftop is completed shaded by PV panels; annual cooling load decreased from 3.417 GWh to 2.996 GWh, while only 1.04% shaded losses are observed for fully shaded (FS) buildings compared to those with no shading (NS), as PV generation decreases from 594.39 kWh/m 2 to 588.21 kWh/m 2 . The net present cost of the project has been decreased from US$4.77 million to US$4.41 million by simply covering the rooftop completely with PV panels, for a net-zero energy building.

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“…Tan et al delineated two tree planting strategies for mitigating daytime UHI effects in a high-density urban environment [22]. In addition to the greenery at the street level, the environmental benefits of green roofs, such as alleviating UHI effects, reducing energy use, and improving microclimate and air quality, have also been extensively investigated [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Diurnal Thermal Behavior of Pavements, Vegetation, and Water Pond in a Hot-Humid City

Yang

Zhao

2015

Buildings

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This study investigated the diurnal thermal behavior of several urban surfaces and landscape components, including pavements, vegetation, and a water pond. The field experiment was conducted in a university campus of Guangzhou, South China, which is characterized by a hot and humid summer. The temperature of ground surface and grass leaves and the air temperature and humidity from 0.1 to 1.5 m heights were measured for a period of 24 h under hot summer conditions. The results showed that the concrete and granite slab pavements elevated the temperature of the air above them throughout the day. In contrast, the trees and the pond lowered the air temperature near ground during the daytime but produced a slight warming effect during the nighttime. The influence of vegetation on air temperature and humidity is affected by the configurations of greenery. Compared to the open lawn, the grass shaded by trees was more effective in cooling and the mixture of shrub and grass created a stronger cooling effect during the nighttime. The knowledge of thermal behavior of various urban surfaces and landscape components is an important tool for planners and designers. If utilized properly, it can lead to climatic rehabilitation in urban areas and an improvement of the outdoor thermal environment.

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Green-Roof Effects on Neighborhood Microclimate and Human Thermal Sensation

Cited by 196 publications

References 28 publications

Quantifying the Impact of Green-Roofs on Urban Heat Island Mitigation

Quantifying the Impact of Green-Roofs on Urban Heat Island Mitigation

NPC Based Design Optimization for a Net Zero Office Building in Hot Climates with PV Panels as Shading Device

Diurnal Thermal Behavior of Pavements, Vegetation, and Water Pond in a Hot-Humid City

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