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Impact of insulation and wall thickness in compressed earth buildings in hot and dry tropical regions
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2020-07-08 , DOI: 10.1016/j.jobe.2020.101612
Ibrahim Neya , Daniel Yamegueu , Yézouma Coulibaly , Adamah Messan , Arnaud Louis Sountong-Noma Ouedraogo

Outdoor climatic conditions such as sun radiation, air temperature and humidity, wind speed are the main factors that determine the thermal response of free-running buildings. However, the thermal behaviour of buildings can be regulated by a proper choice of suitable materials to maintain thermal comfort for the occupants. Through a validated energy model, this article evaluates the influence of insulation and thermal mass on the envelope of a compressed stabilised earth blocks test cell in a hot and dry tropical climate. The study assesses the impact of these parameters on building thermal performance. The effect of insulation is studied by considering different insulators made of glass wool or straw mixed with lime. The thermal inertia impact has been assessed by varying the wall thickness. The results show that insulation with 0.10 m glass wool thickness and 0.15 m straw mixed with 0.02 m lime have very close thermal performance. The study also shows that the appropriate wall thickness for adequate thermal comfort depends on the building insulation state. Without insulation, the wall thicknesses of 0.22 m and 0.35 m showed the best thermal performance. The corresponding decrement factors were respectively 30% and 17%. An insulated wall thickness of 0.14 m was the optimal choice because this choice lowered outdoor temperature amplitude to 22% and was more resource efficient.



中文翻译:

炎热干燥热带地区压缩土建筑中保温层和壁厚的影响

户外气候条件(例如太阳辐射,空气温度和湿度,风速)是决定自由运行建筑物的热响应的主要因素。然而,建筑物的热行为可以通过合适的材料的适当选择来调节,以保持热舒适的乘客。通过一个经过验证的能量模型,本文评估了在炎热干燥的热带气候中,绝热和热质量对压缩稳定土块测试单元外壳的影响。这项研究评估了这些参数对建筑物热性能的影响。通过考虑由玻璃棉或稻草与石灰混合制成的不同绝缘子来研究绝缘效果。通过改变壁厚可以评估热惯性的影响。结果表明,绝缘带为0。10 m厚的玻璃棉和0.15 m的稻草与0.02 m的石灰混合具有非常接近的热性能。研究还表明,适当的壁厚和足够的热舒适度取决于建筑物的隔热状态。在没有绝缘的情况下,0.22 m和0.35 m的壁厚显示出最佳的热性能。相应的减量因子分别为30%和17%。隔热壁厚为0.14 m是最佳选择,因为这种选择可将室外温度幅值降低至22%,并提高资源利用率。35 m表现出最佳的热性能。相应的减量因子分别为30%和17%。隔热壁厚为0.14 m是最佳选择,因为这种选择可将室外温度幅值降低至22%,并提高资源利用率。35 m表现出最佳的热性能。相应的减量因子分别为30%和17%。隔热壁厚为0.14 m是最佳选择,因为这种选择可将室外温度幅值降低至22%,并提高资源利用率。

更新日期:2020-07-08
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