Evaluating the Impact of Vertical Green Systems on Building Temperature Regulation: Effects of Shading Density and Proximity

Urban heat islands and increasing energy consumption in subtropical regions such as Taiwan present substantial challenges, particularly in densely populated areas where traditional green spaces are limited. To address these issues, vertical green systems (VGSs) have emerged as a sustainable solution to improve building energy efficiency and mitigate urban heat. This study investigates the impact of VGSs on building temperature regulation, specifically focusing on the effects of shading density and the distance from the building facade. Two experimental setups were assessed, with VGSs positioned at distances of 50 cm and 100 cm, and shading densities of 70% and 95%. Experiments conducted between May and September 2022, under full sunlight (average temperature of 33 °C), revealed that a VGS with a 95% shading density significantly reduced solar radiation to below 50 W/m2. Additionally, it lowered interior temperatures by 0.5–2.1 °C and decreased surface temperatures by 5–12 °C when positioned 100 cm from the building. The VGS also enhanced temperature stability, maintaining interior temperature fluctuations within 1 °C compared to 4 °C in the control group. These results demonstrate that higher shading densities and increased distances from the building facade optimize temperature control and energy efficiency. The findings offer valuable insights for sustainable urban building design, suggesting that VGSs with greater shading densities and appropriate distances provide significant benefits in reducing solar radiation, surface temperatures, and interior temperature fluctuations.

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