The present study compares the thermal performance of two buildings, one with a conventional roof and another with a green roof. In order to achieve this, a transient mathematical model is developed which considers the heat transfer through the walls and the roof, additionally the model considers the energy balance to determine the change of the temperature inside buildings. The mathematical model needs as input data, solar radiation, ambient temperature and wind speed, which are accessible meteorological variables. The results show that green roofs reduce inside temperature fluctuations of buildings up to 14 K, compared to conventional roofs. Additionally, green roofs allow reaching the comfort temperature: the temperature inside buildings is reduced up to 12 K for warm climates as Mexico City.

本研究比较了两栋建筑物的热性能，一栋采用常规屋顶，另一栋采用绿色屋顶。为了实现这一目标，建立了一个瞬态数学模型，该模型考虑了通过墙壁和屋顶的热传递，此外，该模型还考虑了能量平衡以确定建筑物内部温度的变化。数学模型需要作为输入数据，太阳辐射，环境温度和风速，这些是可访问的气象变量。结果表明，与传统屋顶相比，绿色屋顶减少了高达14 K的建筑物内部温度波动。此外，绿色的屋顶可以达到舒适的温度：对于像墨西哥城这样的温暖气候，建筑物内部的温度可以降低到12K。