Abstract
Due to the different types of courtyards in vertical courtyard system (VCS), their impacts on thermal performance in office buildings may vary. To better understand this issue, this paper investigates the thermal performance impact of three typical vertical courtyards. A field case study was conducted in VCSs during two typical extreme hot days under hot-humid climate conditions. The results show that the vertical courtyards have significant cooling effects under hot-humid climatic conditions. Via testing on linear, integrated, and rooftop courtyard with fusion layout, the fusion one has an obviously positive impact on air temperature reduction (4.3 °C). Compared with the linear and integrated courtyards, the maximum air temperature difference of fusion layout is around 1.6 °C. The thermal radiation environment of the fusion layout was better than that of the other two (linear and integrated). Besides, the surface temperature of the pavements (wood panel) in the vertical courtyards can reach 47 °C, while the vegetation can lower it by 8 °C under the same weather conditions. These findings show that the courtyard with fusion layout is more suitable for extreme hot weather conditions.
Highlights
Due to the rapid population growth and shortage of urban land, a large amount of natural urban green space in China has been replaced by concrete constructions with a low surface reflectivity [1,2,3].In order to improve the efficiency of land use in urban areas, high-rise and high-density buildings are continually being built
The measurements were conducted in the vertical courtyard system (VCS) of a high-density office building at Nanning City, located in the hot-humid climate zone
By taking an in-depth look at VCS in office buildings with high-density functional space, different types of vertical courtyards in a hot-humid area were experimentally investigated in terms of thermal control performance
Summary
In order to improve the efficiency of land use in urban areas, high-rise and high-density buildings are continually being built This causes several environmental issues, among which the urban heat island effect (UHIE) and increased heat-related morbidity and mortality under extreme heat conditions have attracted much attention, especially in hot-humid areas [4,5,6]. To mitigate these issues, practical solutions in urban construction are urgently needed. This trend is more obvious in hot-humid climate areas. As reported by Aldawoud [7], courtyards can result in significant temperature reductions, but their impacts will vary with environmental factors, such as climate conditions, ambient surface properties, and courtyard forms
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