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Experimental and numerical evaluation of the hygrothermal performance of a hemp lime concrete building: A long term case study

机译：大麻石灰混凝土建筑湿热性能的实验和数值评估：长期案例研究

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摘要

Hemp-lime concrete (HLC) is a bio-based material which is currently undergoing a growing development. HLC is a low embodied energy material and an excellent hygrothermal regulator. Its thermal, hygric and mechanical properties are well known, and its capacity to reduce energy needs and to improve hygrothermal comfort is demonstrated across many laboratory and numerical studies. However, there are few works about its hygrothermal performance in real climatic conditions on the scale of a building. In order to address this issue, a long term in-situ measurement is carried out to analyze the hygrothermal performance of a HLC individual dwelling-house during 4 years. The analysis of the hygrothermal behavior of a wall is achieved by comparing measurements and numerical simulations results. In this study, two simulation tools are used and compared. The first tool is based on the well-known Wufi software. In the second simulation tool, hysteresis phenomenon and temperature-dependence of moisture content are considered in a heat and moisture transfer model. In-situ monitoring of walls temperatures shows the ability of HLC to almost completely dampen variations of external temperature with about 12 h time-shift. The evolution of indoor relative humidity confirms that HLC has an excellent moisture buffer performance. Comparisons between numerical and experimental results highlight the interest to consider the effect of temperature on sorption process in the simulation of the hygrothermal response of a HLC wall in real climatic conditions.
机译：麻石灰混凝土（HLC）是一种生物基材料，目前正在不断发展。 HLC是一种低内含能量的材料，也是一种出色的湿热调节剂。其热，湿气和机械性能是众所周知的，在许多实验室和数值研究中都证明了其减少能源需求和提高湿热舒适性的能力。然而，关于建筑物在实际气候条件下的湿热性能的研究很少。为了解决这个问题，进行了长期的现场测量，以分析4年内HLC个人住宅的湿热性能。通过比较测量结果和数值模拟结果，可以对墙体的湿热行为进行分析。在这项研究中，使用和比较了两种仿真工具。第一个工具基于著名的Wufi软件。在第二个模拟工具中，在热量和水分传递模型中考虑了水分的滞后现象和温度依赖性。壁温的原位监测表明，HLC能够以约12小时的时移几乎完全抑制外部温度的变化。室内相对湿度的变化证实了HLC具有出色的水分缓冲性能。数值和实验结果之间的比较突出表明了在实际气候条件下，在模拟HLC墙的湿热响应时要考虑温度对吸附过程的影响的兴趣。

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