Impact of green walls occultation on energy balance: Development of a TRNSYS model on a brick masonry house

Kenai, Mohamed-Amine; Libessart, Laurent; Lassue, Stéphane; Defer, Didier

doi:10.1016/j.jobe.2021.102634

Cited by 20 publications

(12 citation statements)

References 52 publications

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“…Many simulation tools have been used to simulate indoor air temperatures, such as Ecotect [40], Trnsys [41,42], and Energy plus [43,44]. However, these tools are not computational fluid dynamics (CFD) models, and cannot simulate the shading effects of plants because these non-CFD models cannot simulate the translucency of leaves towards radiation [45].…”

Section: Research Toolsmentioning

confidence: 99%

Evaluating the Effects of Roof Greening on the Indoor Thermal Environment throughout the Year in a Chinese City (Chenzhou)

Zheng

Chen

et al. 2022

Forests

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Indoor cooling is preferred during hot summers but unappreciated in cold winters. With this research, we aimed to clarify the cooling performances of roof greening throughout the year and identify the optimum roof greening coverage for the indoor thermal environment in Chenzhou, a city in China with hot summers and cold winters. The layout of buildings, building materials, and local climate data of Chenzhou were collected. The ENVI-met model was applied as the analytical tool after its accuracy was confirmed by a field experiment. The Kriging model was employed to interpret the annual effects of roof greening. The analytical results revealed that in Chenzhou, roof greening reduced indoor temperatures throughout the year, and the higher the coverage of roof greening, the greater the performance of indoor cooling. Moreover, hot climates enhanced the indoor cooling performances of roof greening. From the view of annual thermal perception, the increase in roof greening coverage reduced the duration of warm perceptions throughout the year and extended the perceptions of slightly warm, slightly cool, and cool. Generally, increased roof greening coverage improved the indoor thermal perception in Chenzhou throughout the year. The ENVI-met + Kriging model, an evaluation method of annual cycles, can be used to evaluate the annual performance of roof greening in terms of indoor thermal environment in other climate zones.

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Section: Research Toolsmentioning

confidence: 99%

Evaluating the Effects of Roof Greening on the Indoor Thermal Environment throughout the Year in a Chinese City (Chenzhou)

Zheng

Chen

et al. 2022

Forests

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“…At the same time, some authors pointed out that vertical greenery produces advantages, in terms of the external surface temperature reduction. Kenai et al [39] evaluated the thermal performance of vertical greenery on thermal isolated and non-isolated buildings. They demonstrated that with the inclusion of a green wall, it is possible to reduce the thermal insulation thickness.…”

Section: Benefits Of Vertical Greenerymentioning

confidence: 99%

Experimentation of Mitigation Strategies to Contrast the Urban Heat Island Effect: A Case Study of an Industrial District in Italy to Implement Environmental Codes

et al. 2022

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The European goals to reduce CO2 emissions by up to 40% by 2030 and reach carbon neutrality by2050 cannot ignore the building sector, that accounts for 27% of global greenhouse gas emissions. In the context of the sustainable development goals, it is a key point to consider the reduction of the heat island effect in the urban environment. Considering this background and the proven absence of the clear promotion of urban mitigation measures, the research aims at investigating the influence on several micro-climate parameters of different retrofitting strategies at the building level (green façades) and the cooling strategies at the urban scale (e.g., cool pavements, trees). As a case study, the application of these measures in an industrial district located in Italy is evaluated. ENVI-met software was adopted to perform the outdoor environmental simulations, in order to assess the effectiveness of the mitigation strategies proposed, considering both the whole district and a portion, focusing on urban canyons. Cool pavements proved to be the most promising strategy to both reduce the air temperature and increase the relative humidity. Slighter effects on environmental conditions can be achieved by planting trees and installing green walls that, by contrast, significantly affect the mean radiant temperature and buildings’ surface temperatures, respectively.

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“…Vertical greening systems provide passive cooling for indoor and outdoor environments by reducing ambient air temperature, as well as enhancing the atmospheric quality and occupations' thermal comfort [7]. Moreover, green walls have many extraordinary benefits such as reducing internal air temperature, reducing energy consumption for cooling, creating a pleasant environment, and helping adapt urban areas and cities to climate change and global warming, mitigating the impact of industrialization and urbanization on the environment, and improving urban air quality [1,[8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The study focused on air quality using computer simulation. Kenai et al [12] developed TRNSYS, a model to study the energy balance of green walls. The developed model was based on thermal exchanges between building facades and the external environment in the presence of green walls.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Shading and Thermal Performances of Vertical Green Wall on Buildings in a Hot Arid Region

2022

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Due to global concerns about energy issues, global warming, and urban quality, vertical greening systems (VGS) are receiving more attention in construction and design research. Therefore, VGS has become part of building envelope design as a passive technique for saving energy in building sectors. The current study aimed to investigate shading and energy performances of VGS in buildings in hot climate regions and to optimize VGS design as a building design element. The study was conducted through simulation and field experiments in a student housing building at a university campus (Irbid, Jordan). Field measurements were taken to assess the thermal effect of the green wall and daylight performance as well as the efficiency of the typical green wall design configuration. Furthermore, a methodology for accurately representing green walls was established and used. Both simulation and experimentation demonstrated that the thickness of the air cavity and the percentage of foliage coverage can have a substantial impact on the performance of the green wall system. Results showed that green wall systems are effective natural sunscreens and shading systems. A green wall helped to reduce the exterior wall surface temperatures by a range of 6 to 11 °C compared to the base case of the wall without a VGS on different days. In addition, it decreased the interior surface temperature of the investigated southern façade by an average of 5 °C compared to the base case. Green wall design configurations for hot climate regions, such as Jordan, will help designers to use the VGS as a design element. Our findings indicate that GW could help to improve the thermal and daylight environment and thus the results could be taken as indicative for GW wall design in other areas or buildings.

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Impact of green walls occultation on energy balance: Development of a TRNSYS model on a brick masonry house

Cited by 20 publications

References 52 publications

Evaluating the Effects of Roof Greening on the Indoor Thermal Environment throughout the Year in a Chinese City (Chenzhou)

Evaluating the Effects of Roof Greening on the Indoor Thermal Environment throughout the Year in a Chinese City (Chenzhou)

Experimentation of Mitigation Strategies to Contrast the Urban Heat Island Effect: A Case Study of an Industrial District in Italy to Implement Environmental Codes

Optimizing Shading and Thermal Performances of Vertical Green Wall on Buildings in a Hot Arid Region

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