Identification of key plant traits contributing to the cooling effects of green façades using freestanding walls

Koyama, Toshie; Yoshinaga, Mika; Hayashi, Hideki; Maeda, Kei‐ichiro; Yamauchi, Akira

doi:10.1016/j.buildenv.2013.04.020

Cited by 120 publications

(66 citation statements)

References 18 publications

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“…The cooling benefit was attenuated by the synergistic development of building heat-sink effect. When a greater wall surface is covered, the ability of VGSs to bring thermal benefit in the reduction of cooling load in hot summer period could be enhanced [40]. The azimuth orientation of the vertical greenery on the wall is another significant factor that affects its thermal performance, as it can alter the wall temperature and the amount of solar radiation received [41,42].…”

Section: Factors Affecting the Energy Saving Ability Of Vgsmentioning

confidence: 99%

Energy saving potential and life cycle environmental impacts of a vertical greenery system in Hong Kong: A case study

Pan

Chu

2016

Building and Environment

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Section: Factors Affecting the Energy Saving Ability Of Vgsmentioning

confidence: 99%

Energy saving potential and life cycle environmental impacts of a vertical greenery system in Hong Kong: A case study

Pan

Chu

2016

Building and Environment

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“…Previous research strongly suggests that PGC significantly impacts the magnitude of cooling a green façade provides [12,17]. Traditionally, PGC has been calculated from binary images of green façades that were derived from digital photos using image processing.…”

Section: Plant Characteristicsmentioning

confidence: 99%

“…canopy area, canopy density or shadow, leaf area index (LAI), number of leaf layers, plant thicknesses), and relationships with weather parameters (air temperature, relative humidity, solar radiation, wind speed), and wall surface temperature [4,9,12,17,28,31,36,39]. Koyama et al [17] investigated the relationship between the percent wall coverage of five vine species and reductions in wall surface temperature using freestanding walls. They found percent coverage to be the key variable determining the overall cooling effect.…”

Section: Introductionmentioning

confidence: 99%

Cooling effect of direct green façades during hot summer days: An observational study in Nanjing, China using TIR and 3DPC data

Yin

Kong

Middel

et al. 2017

Building and Environment

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Highlights• Direct green façades (DGFs) are being applied to buildings in high density cities.• A new methodology to evaluate DGFs' fine-scale cooling effect is presented.• DGF enables 4.67 and 8.03 °C maximum surface temperature reduction compared to bare wall at overall and pixel scales.• DGF cooling effect is most obvious around midday and significantly decreases at night.• Surface temperatures of DGF exhibit significant spatial variations at pixel scale. AbstractThermal regulation is a key ecosystem service provided by direct green façades (DGFs), as vegetated walls absorb short wave radiation, reduce solar re-radiation from hard surfaces, and provide cooling due to shading and evapotranspiration. Few studies have investigated the correlation between the cooling effect of DGFs and vegetation characteristics at a fine spatial and temporal scale. This paper presents a new methodology to evaluate the cooling effect of DGFs related to fine-scale plant characteristics for hot summer days using thermal infrared (TIR) and three-dimensional point cloud (3DPC) data, through a case study conducted at the Executive Office Building on Nanjing University's Xianlin Campus, China. Results show that daily mean DGF surface temperature is significantly lower than the average bare wall surface temperature, with a maximum reduction of 4.67 °C. The cooling effect of the DGF is most obvious during midday (10:30 h to 16:00 h) and significantly decreases at night. At the pixel scale, the DGF exhibits a significant spatial variation of surface temperatures, which may be closely related to the DGF's canopy structure. Among the four vegetation indices acquired based on 3DPC data, the percentage of green coverage and the cooling effect of the DGF exhibited a linear relationship, while plant thicknesses, point density, and volume of the green façade were power function distributions. Incoming solar radiation and air temperature are the dominant independent variables in cooling effect and surface temperature fitting models. Our findings can guide DGF design to cool the thermal environment more effectively and to enhance building energy savings.

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“…The consequence is a reduction of the energy demand for building cooling [75]. Green facades lead to cooling effects by reducing building surface temperatures and mitigating the urban heat island effect [76]. In the context of mitigating anthropogenic climate change (i.e., greenhouse gas effects), urban forests play an important role within the carbon cycle by sequestering atmospheric CO 2 , which is stored as carbon [77,78].…”

Section: Biodiversity and Ecosystem Servicesmentioning

confidence: 99%

Urbanity and Urbanization: An Interdisciplinary Review Combining Cultural and Physical Approaches

Schneider

Achilles

Merbitz

2014

Land

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This review paper focuses on research schemes regarding urbanity and urbanization, and brings together both cultural and physical approaches. First, we review the cultural and social construction of urbanity (as related to urbanization) in Germany. In the early 20th century, urbanity was mainly the result of identity derived from a historical perspective in cities. This has changed profoundly in recent decades as urbanity stems more and more from various urban lifestyles and the staging of societal experiences, as summarized in the German term, "Erlebnisgesellschaft" (thrill-seeking society). The discussion is extended by an assessment of the recent state of the art regarding physical urban research. The focus lies on different fields of research; we address topics such as biodiversity, urban climate, air pollution, and resilience, as well as their impact on urban planning and governance. In conclusion, in order to tackle recent developments and future challenges regarding social and environmental issues, an integrative approach urges novel cross-and inter-disciplinary research efforts in urban studies, including urban-rural linkages. A newly constituted assessment of urbanization and city quarter development is proposed; the assessment focuses on the conjoint analysis of mobility, "Energiewende" (energy transition), cultural drivers, demographic development, and environmental issues.

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Identification of key plant traits contributing to the cooling effects of green façades using freestanding walls

Cited by 120 publications

References 18 publications

Energy saving potential and life cycle environmental impacts of a vertical greenery system in Hong Kong: A case study

Energy saving potential and life cycle environmental impacts of a vertical greenery system in Hong Kong: A case study

Cooling effect of direct green façades during hot summer days: An observational study in Nanjing, China using TIR and 3DPC data

Urbanity and Urbanization: An Interdisciplinary Review Combining Cultural and Physical Approaches

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