外观
叶面积指数
每年落叶的
环境科学
能源消耗
生长季节
索引(排版)
气象学
气候带
大气科学
地理
自然地理学
土木工程
工程类
植物
计算机科学
地质学
万维网
电气工程
生物
作者
Gabriel Pérez,Julià Coma,Marta Chàfer,Luisa F. Cabeza
标识
DOI:10.1016/j.buildenv.2021.108497
摘要
Double-skin green facades using deciduous climbing plants are easy-to-implement construction systems stated to be effective energy-saving tools for buildings during cooling periods. Although the leaf area index (LAI) has been identified as a key parameter for characterizing foliar density and, consequently, the green facade's potential as a passive tool for energy savings, a lack of knowledge still remains on this index's values and measurement methods. The present paper aims to characterize the annual LAI evolution of a Boston ivy double-screen green facade under Mediterranean continental climate (Csa), by using an original non-destructive methodology during two consecutive years. Moreover, the influence of the green facade's foliage density, characterized by LAI, on the external building wall temperatures and the energy consumption by season and orientation was addressed. From the results it can be noticed that LAI changed seasonally over the course of five periods with a related differentiated energy performance: early summer (LAI of 4.8; 54% savings for cooling), late summer (LAI of 4.4; 30% savings for cooling), autumn (LAI of 1.7; 5.4% increase for heating), winter (LAI of 0.9; 5.4% increase for heating), and spring (LAI of 3.6; 11.9% increase for heating). The increase of energy consumption during leaf-off stage was directly linked to woody material and remaining leaves. Two crucial effects were identified and characterized: firstly, the influence of facade orientation and, secondly, a slight “insulation effect” at night, with the green screen acting as a thermal barrier. • Seasonal influence of deciduous green facades on building energy consumption. • Leaf area index (LAI) is key for characterizing foliar density and shadow effect. • Innovative methodology for the continuous measurement of LAI on green facades. • LAI changed seasonally over the course of five periods under Csa climate. • Large energy savings for cooling and slightly increment for heating.
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