Influence of view factors on outdoor thermal comfort of residential areas in hot-humid regions.

IF 3 3区 地球科学 Q2 BIOPHYSICS
Li Li, Jiayi Hong, Mingtao Ma, Chengliang Fan, Xiu Xiong, Yue Pang
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Abstract

Sky View Factor (SVF) is commonly used to describe the impact of urban geometry on the urban thermal environment. Shading effects from plants and buildings also exert a considerable influence. To investigate the influence of view factors on outdoor thermal comfort in residential areas, we employed the Physiological Equivalent Temperature (PET) and view factors (SVF, TVF, BVF) as indicators to determine outdoor thermal comfort and the quantity of shaded spaces. Thermal measurements collected from 13 points in Guangzhou, China, Our findings revealed that high TVF points exhibited more stable air temperature throughout the daytime, with average temperature differentials ranging 0.4-1.9 °C lower than other points. Air temperature demonstrated a positive correlation with SVF (R2 = 0.53), while exhibiting a negative correlation with TVF (R2 = 0.45). Additionally, shading provided by plants and buildings manifests heterogeneity. At similar SVF levels, points predominantly shaded by plants (TVF > BVF) showcased lower Mean Radiant Temperature (MRT) and PET compared to points shaded mainly by buildings (BVF > TVF). The maximum reduction in air temperature and PET reached 1.1 °C and 1.2 °C, respectively. BVF exerted greater influence earlier in the morning, as solar altitude angle rises, the average thermal parameters of sites with BVF > TVF escalated rapidly until eventually surpassing sites with TVF > BVF. Last, superior thermal conditions were only ensured under high shading conditions. When the effective shading ratio of plants and buildings diminished (SVF > 0.3), the microclimate of measurement points might be impacted by the long-wave radiation from the underlying surface.

景观因素对湿热地区住宅区室外热舒适度的影响。
天空视角系数(SVF)通常用于描述城市几何形状对城市热环境的影响。植物和建筑物的遮阳效果也有相当大的影响。为了研究视线因素对居住区室外热舒适度的影响,我们采用了生理等效温度(PET)和视线因素(SVF、TVF、BVF)作为指标来确定室外热舒适度和遮阳空间的数量。我们的研究结果表明,高 TVF 点在整个白天的气温较为稳定,平均温差比其他点低 0.4-1.9 °C。气温与 SVF 呈正相关(R2 = 0.53),而与 TVF 呈负相关(R2 = 0.45)。此外,植物和建筑物提供的遮阳效果也存在差异。在相似的 SVF 水平下,与主要由建筑物遮挡的点(BVF > TVF)相比,主要由植物遮挡的点(TVF > BVF)显示出较低的平均辐射温度(MRT)和 PET。气温和 PET 的最大降幅分别达到 1.1 °C 和 1.2 °C。BVF在清晨的影响更大,随着太阳高度角的上升,BVF>TVF点的平均热参数迅速上升,最终超过了TVF>BVF点。最后,只有在高遮阳条件下才能确保优越的热量条件。当植物和建筑物的有效遮阳率降低时(SVF > 0.3),测点的小气候可能会受到来自地表的长波辐射的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.40
自引率
9.40%
发文量
183
审稿时长
1 months
期刊介绍: The Journal publishes original research papers, review articles and short communications on studies examining the interactions between living organisms and factors of the natural and artificial atmospheric environment. Living organisms extend from single cell organisms, to plants and animals, including humans. The atmospheric environment includes climate and weather, electromagnetic radiation, and chemical and biological pollutants. The journal embraces basic and applied research and practical aspects such as living conditions, agriculture, forestry, and health. The journal is published for the International Society of Biometeorology, and most membership categories include a subscription to the Journal.
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