热导率
水泥
材料科学
多孔性
热传导
饱和度
饱和(图论)
热泵
薄泥浆
岩土工程
多孔介质
体积热容
热交换器
传热
热力学
复合材料
环境科学
土壤科学
地质学
传热系数
土壤水分
组合数学
物理
数学
作者
Shihao Dong,Guang Liu,Tao Zhan,Yang Yao,Long Ni
标识
DOI:10.1016/j.icheatmasstransfer.2022.106079
摘要
Cement-based material is frequently used in many aspects. For example, it is used as a sort of grout in a ground source heat pump system, whose heat conduction performance directly affects the heat change efficiency of the vertical ground heat exchanger. However, there are few thermal conductivity models applicable to cement-based grout materials, and the accuracy of published models needs to be improved. Therefore, a thermal conductivity prediction model for cement-based materials was performed according to the structure and heat conduction equation, which can predict the influence of many factors on thermal conductivity, such as aggregate content (sand-cement ratio), porosity and saturation degree. The overall accuracy is high, with 39 sets of data (75% of the data volume) whose errors are less than ±10%, meeting engineering applications, while the error using existing models mostly exceeds ±20%. This model can also predict a large proportioning range with the water-cement ratio from 0.3 to 0.7, the sand-cement ratio from 0.5 to 3.0, and the saturation degree from 0 to 1. Based on the model prediction results, the variation maps of different sand-cement ratios and porosity under dry and saturated conditions were proposed, and the simplified fitting formula for a range of common values was given.
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