Green roofs may be considered a passive energy saving technology that also offer benefits like environmental friendliness and enhancement of aesthetic and architectural qualities of buildings. This paper examines the energy and economic viability of the green roof technology in the hot humid climate of Saudi Arabia by considering a modern four bedroom residential building in the city of Dhahran as a case study. The base case and green roof modelling of the selected building has been developed with the help of DesignBuilder software. The base case model has been validated with the help of 3-month measured data about the energy consumption without a green roof installed. The result shows that the energy consumption for the base case is 169 kWh/m 2 while the energy consumption due to the application of a green roof on the entire roof surface is 110 kWh/m 2 . For the three investigated green roof options, energy saving is found to be in the range of 24% to 35%. The economic evaluation based on the net present value ( NPV) approach for 40 years with consideration to other environmental advantages indicates that the benefits of the green roof technology are realized towards the end of the life cycle of the building.
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机译：绿色屋顶可以被认为是一种被动节能技术，它还具有环保优势以及增强建筑物的美学和建筑品质等优点。本文通过以达兰市为例，研究现代四居室住宅建筑在沙特阿拉伯炎热潮湿气候中的绿色屋顶技术的能源和经济可行性。所选建筑物的基础案例和屋顶绿化模型是在DesignBuilder软件的帮助下开发的。基本案例模型已在未安装绿色屋顶的情况下，通过有关能耗的3个月实测数据进行了验证。结果表明，基本情况的能耗为169 kWh / m 2，而在整个屋顶表面上应用绿色屋顶所产生的能耗为110 kWh / m 2。对于三个已调查的绿色屋顶选项，发现节能量在24％到35％之间。基于40年净现值（NPV）方法的经济评估，同时考虑到其他环境优势，表明绿色屋顶技术的益处已在建筑物生命周期的尽头实现。
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