Abstract
In recent years, the climate change (CC) and urban heat island (UHI) effects are becoming serious problems, affecting people’s life and health, especially in hot summer. For large cities such as Tokyo and Osaka in Japan, the UHI effect is particularly intense. It is known that about 40% of urban anthropogenic heat comes from buildings in large cities. To reduce the anthropogenic heat of buildings is an important countermeasure to this problem. Strategies for UHI mitigation include urban ventilation, urban greening, green roof, highly reflective (HR) roads, and HR building envelopes, etc. Among these mitigation strategies, the research on HR building envelopes has been carried out globally. However, it is not clear that how the HR building envelopes affect the urban outdoor environment temperature and indoor thermal loads of urban buildings which is directly related to the selection of heating, ventilation and air conditioning (HVAC) system. Thus, this study aims to evaluate the effect of solar reflectivity of building envelopes varied from 0.1 to 0.9, on the outdoor environment temperature and indoor thermal loads of buildings located on Osaka University Suita Campus, Japan, using Computational Fluid Dynamics (CFD) and numerical analysis.
Highlights
The urban heat island (UHI) effect is a well-documented climatic change phenomenon and is becoming very serious especially in the summer period due to the rapid increase of urban anthropogenic heat [1]
A reviewed paper showed that the mitigation strategies such as; highly reflective (HR) and emissive light colored materials, cool colored materials, phase change materials (PCMs) and dynamic cool materials used for building roofs or facades, increasing urban albedo, green roofs, can significantly contribute to UHI mitigation and the improvement of urban environmental quality [8]
The influence of HR building envelopes on the outdoor environment temperature hasn’t been discussed widely in Japan, this study aims to evaluate the effect of solar reflectivity of building envelopes on the outdoor environment air temperature and indoor thermal loads with consideration of varying the solar reflectivity of building envelopes form 0.1 to 0.9, using a Computational Fluid Dynamics (CFD) and numerical analysis
Summary
The urban heat island (UHI) effect is a well-documented climatic change phenomenon and is becoming very serious especially in the summer period due to the rapid increase of urban anthropogenic heat [1]. In order to mitigate the UHI effect, many studies have focused on defining the relationship between rising temperatures and different urban elements [5,6,7]. A total of five different black colorants produced in laboratory have been mixed with commercial paints and have been compared to the standard black colorant usually used for building paints. It showed that the surface temperature on the back of a painted support is lower as the total solar reflectance is higher, can be used for building energy conservation
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