This work deals with the influence of envelope thickness and solar absorption on the time lag and the decrement factor. For this, a test cell of 1 m3 of volume is built with a material commonly used in construction in Senegal, the compressed earth brick stabilized with cement. The ambient-air temperature inside and outside of test cell and solar direct normal irradiance is measured. The test cell is modeled using EnergyPlus software. The comparison of experimental and theoretical ambient-air temperature puts out a great linear showing the reliability of the model. The time lag and the decrement factor are calculated using the air-sol equivalent temperature of the test cell and the inside ambient-air temperature. The time lag and decrement factor of the compressed stabilized earth brick envelope are respectively 0.22 and 6.6 h showing the good thermal inertia of those bricks. A parametric study is performed to determine the effect of envelope thickness and solar absorptivity on the time lag and decrement factor. The results show that the decrement factor decreases with envelope thickness while the time lag increases linearly and that an envelope thickness of 32 cm has a decrement factor of around zero with a maximum time lag of about 12 h for this type of material. The envelope’s solar absorption has a moderate effect on the decrement factor and time lag.

中文翻译：

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测试电池的外壳厚度和太阳能吸收率对时滞和衰减因子的影响

这项工作涉及外壳厚度和太阳能吸收对时滞和递减因子的影响。为此，使用塞内加尔建筑中常用的材料建造了一个体积为 1 立方米的测试室，即用水泥稳定的压缩土砖。测量测试电池内外的环境空气温度和太阳直接法向辐照度。测试单元使用 EnergyPlus 软件建模。实验和理论环境空气温度的比较给出了一个很好的线性，表明模型的可靠性。使用测试单元的气溶胶等效温度和内部环境空气温度计算时滞和递减因子。压缩稳定土砖围护结构的时滞和递减系数分别为0.22和6。6 小时显示了这些砖的良好热惯性。进行参数研究以确定外壳厚度和太阳能吸收率对时滞和衰减因子的影响。结果表明，递减因子随着包络厚度的增加而减小，而时滞线性增加，并且对于这种类型的材料，32 cm 的包络厚度的递减因子约为 0，最大时滞约为 12 小时。外壳的太阳能吸收对衰减因子和时间滞后有中等影响。结果表明，递减因子随着包络厚度的增加而减小，而时滞线性增加，并且对于这种类型的材料，32 cm 的包络厚度的递减因子约为 0，最大时滞约为 12 小时。外壳的太阳能吸收对衰减因子和时间滞后有中等影响。结果表明，递减因子随着包络厚度的增加而减小，而时滞线性增加，并且对于这种类型的材料，32 cm 的包络厚度的递减因子约为 0，最大时滞约为 12 小时。外壳的太阳能吸收对衰减因子和时间滞后有中等影响。