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Experimental assessment of thermal performance of three passive cooling techniques for roofs in a semi-arid climate

机译：在半干旱气候下三种被动冷却技术对屋顶的热性能的实验评估

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摘要

Three passive techniques for air cooling in buildings are tested in the real conditions of Marrakech (Morocco) whose climate is hot semi-arid (BSh type according to the Koppen-Geiger climate classification). The passive techniques, that are white painting, shading and thermal insulation, are applied to the roofs of three outdoor test cells. Thermal performance of these techniques are assessed simultaneously via a 29 summer days monitoring of four test cells, including a reference cell with bare roof. Measurements concerned the cells indoor air temperature, the roof slab inside (ceiling) and outside surface temperature, as well as the heat flux through the roof slab. Moreover, all the local climate parameters were recorded by means of a weather station installed near the test cells. The results show that the studied passive techniques have a significant impact on the heat flux through the roof and consequently on the cells ceiling and indoor air temperature. The white painted roof has the highest thermal performance as it lowers the ceiling temperature by up to 13.0 degrees C relatively to the reference cell; while this temperature reduction was always less than 9.9 degrees C and 8.9 degrees C respectively for the thermally insulated and the shaded roofs. Moreover, the white painted roof reduced the heat flux through the roof slab by up to 66%. (C) 2018 Elsevier B.V. All rights reserved.
机译：在气候为半干旱炎热的马拉喀什（摩洛哥）的实际条件（根据Koppen-Geiger气候分类的BSh类型）的实际条件下，对建筑物的三种空冷技术进行了测试。无源技术，即白色油漆，阴影和隔热材料，被应用于三个室外测试单元的屋顶。这些技术的热性能通过29个夏季的夏季监控同时评估了四个测试单元，包括带有裸露屋顶的参考单元。测量涉及室内空气温度，屋顶板内部（天花板）和外表面温度以及通过屋顶板的热通量。此外，所有本地气候参数都通过安装在测试单元附近的气象站进行记录。结果表明，所研究的被动技术对通过屋顶的热通量有很大影响，因此对电池的顶棚和室内空气温度也有显着影响。漆成白色的屋顶具有最高的热性能，因为相对于参考电池，它可以将天花板温度降低多达13.0摄氏度。而隔热屋顶和阴凉屋顶的降温始终分别低于9.9摄氏度和8.9摄氏度。此外，粉刷成白色的屋顶使通过屋顶板的热通量减少了多达66％。 （C）2018 Elsevier B.V.保留所有权利。

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