Effects of urban geometry on thermal environment in 2D street canyons: A scaled experimental study

Changes in urban geometry significantly alters the microclimate. Suitable geometrical layouts can effectively improve thermal environment to achieve a more sustainable and healthier city. A quantitative assessment of relationship between is essential provide scientific guidance for better building design. Hence, we performed scaled outdoor measurement investigate diurnal variations air, west east wall temperatures within two-dimensional (2D) street canyons. We adopted daily average temperature T‾, range DTR, hottest time tmax describe characteristics. The influence aspect ratios was considered (building height/street width, H/W = 0.5, H 0.5 m, 1, 2, 3, 6, 1.2 m). Canyon air experienced smaller T‾ DTR compared with walls. With an increase ratio, no significant difference observed canyon air. walls 6 lower (26.1–26.9 °C) (11.7–18.4 than those 1 (T‾=26.7–28.7 °C 16.0–26.1 °C). higher phase lag occurred 6. As ratio increased, differences decreased. This study improves our understanding how morphology influences provides meaningful references planning. Such high-quality experimental data be used validate further numerical simulations theoretical models.