A hydrothermal model to assess the impact of green walls on urban microclimate and building energy consumption

Malys, Laurent; Musy, Marjorie; Inard, Christian

doi:10.1016/j.buildenv.2013.12.012

Cited by 115 publications

(63 citation statements)

References 23 publications

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“…However, most studies have focused on the cooling effect of green façades in climates with hot summers, comparing temperatures of vegetated and bare walls using experimental samples, meteorological observing instruments, and mathematical models [11,20,34,36]. For instance, in a study evaluating the thermal effects of different green wall systems [39], measured a reduction of 3.3 °C in ambient air temperature, which corresponded to a 1.1-11.6 °C decrease in the façade surface temperature immediately behind the vegetation, depending on vegetation type.…”

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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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

View full text Add to dashboard Cite

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“…The results were based on thermal comfort indices such as the predicted mean vote (PMV) and physiological equivalent temperature (PET), as well as the three-dimensional non-hydrostatic model ENVI-met and computational fluid dynamics (CFD) simulations. DesignBuilder (DesignBuilder Software Ltd, UK), the integrated environmental solutions virtual environment software (IES VE), Energy Plus, and the thermos-radiative model SOLENE were used to evaluate the effects of planting greenery on buildings and cool loop system planning on the urban temperature and building energy consumption [24][25][26][27][28][29][30]. Next, there were studies on the measurement method of thermal comfort [31] and others assessing the impact of streets pavement on thermal comfort [32].…”

Section: Literature Reviewmentioning

confidence: 99%

Deduction of Optimum Surface Design Factors for Enhancement of Outdoor Thermal Environment in a Micro-Scale Unit

Jung

Yoon

2017

Sustainability

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Abstract:To solve some of the problems associated with changing urban climates, such as the heat island effect, the exterior building skin and ground surfaces should be analyzed because they are directly exposed to the outdoor climate and have the greatest impact on energy consumption. Research is needed to identify design factors to improve the effect of a building's skin in the outdoor summer season's thermal environment. In this study, the current conditions of outdoor thermal environments were identified by conducting field measurements at an apartment housing complex. A simulation analysis was conducted based on cases that included different design factors for a building's skin and ground surfaces. When the significance probability of the design factors for the surface plans for apartment buildings and surface cover was analyzed based on the Taguchi experimental design method, the window plan and surface cover plan influenced the outdoor thermal environment. Notably, the surface cover plan had the most significant impact on the outdoor thermal environment. The result of the analysis of the correlation between the design factors for an apartment complex's surface plans and outdoor thermal environment indices showed that the window plan correlated with the entire surface temperature of building and heat island potential (HIP).

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“…Meanwhile, the urban underlying surface property and architectural form is improved through efficient and aesthetic greening patterns, plant collocation and waterscape settings and the outdoor thermal environment is improved through conduction [12][13][14][15][16][17][18]. Globally, increasingly massive urban construction has caused the serious problem of insufficient land for urban development.…”

Section: Introductionmentioning

confidence: 99%

A Framework for Assessment of the Influence of China’s Urban Underground Space Developments on the Urban Microclimate

et al. 2014

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Abstract:The paper aims to establish the framework for linking underground space projects and the urban microclimate, in order to construct an interdisciplinary research framework. Based on the combination of underground space, urban form and the urban microclimate, the impacts of underground space on urban microclimate factors above ground and underground are summarized and the internal mechanism is investigated. The above ground factor refers to the impact of a new urban form induced by the underground space planning on the urban microclimate. The underground factor refers to the impact of the control of the internal environment of underground space on the ground environment. This study mainly addresses two aspects. Firstly, to identify the influencing factors of urban underground space microclimate and define the research entry point and classify the indicator of the external space environment; secondly, to address the key issues of the research areas and their influence on the urban underground space project and the urban microclimate in the current phase and establish the direction of future research. The microclimate case of the Nanjing underground planning is provided to preliminarily analyze how underground space development improves the urban microclimate. By the comparative analysis of microclimate parameters, air quality parameters, and outdoor thermal environment parameters OPEN ACCESSSustainability 2014, 6 8537 (Mean Radiant Temperature, MRT), the influences and benefits of underground space projects on the urban microclimate is quantitatively explored.

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A hydrothermal model to assess the impact of green walls on urban microclimate and building energy consumption

Cited by 115 publications

References 23 publications

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

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

Deduction of Optimum Surface Design Factors for Enhancement of Outdoor Thermal Environment in a Micro-Scale Unit

A Framework for Assessment of the Influence of China’s Urban Underground Space Developments on the Urban Microclimate

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