In a warming planet, overheating is becoming an increasingly important issue at all latitudes and locations, even in areas which traditionally did not have this problem. Passive cooling systems improve thermal comfort in a hot climate using a fraction of the energy used by conventional mechanical systems. This paper investigates the performance of a novel passive cooling system, a hybrid green roof and verifies its cooling potential, through test beds, in a hot climate in Southern California. The hybrid green roof combines evaporative cooling with a radiant system integrated in the green roof to improve its cooling performance. The concept is then implemented in projects under development in hotclimates in the United States, Middle East and Asia. In these projects additional passive strategies are sometimes combined with the hybrid green roof to substantially improve outdoor and indoor thermal comfort in an extreme climate withminimal use of mechanical cooling.

在一个变暖的星球上，在所有纬度和地区，甚至在传统上没有此问题的地区，过热都变得越来越重要。被动式冷却系统使用的热量仅为传统机械系统的一小部分，从而改善了炎热气候下的热舒适性。本文研究了新型被动冷却系统，混合绿色屋顶的性能，并通过测试台在南加州的高温气候下验证了其冷却潜力。混合式绿色屋顶将蒸发冷却与集成在绿色屋顶中的辐射系统结合在一起，以提高其冷却性能。然后，该概念将在美国，中东和亚洲炎热气候下正在开发的项目中实施。