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对含水砂土导热系数随含水率变化规律的实验研究是进行地源热泵系统设计的基础,本文制备了五类不同粒径,不同含水率的砂样及八类混合砂样,测试了其热导率随含水率的变化规律,并拟合了混合砂样的热导率曲线,结果表明:对于五类不同粒径的砂样及八类混合砂样,热导率均随含水率的增加而增大,而粒径对于热导率影响不大,在低水分含量(ω<15%)条件下,混合砂样拟合曲线与实验值吻合较好。
The experimental study of the thermal conductivity of water-bearing sand with the change of water content is the basis for the design of ground source heat pump system. Five kinds of sand samples and eight kinds of sand samples with different particle sizes and different water contents were prepared in this paper. The results show that the thermal conductivity increases with the increase of water content for five types of sand samples and eight kinds of mixed sand samples with different grain sizes. But the particle size has little effect on the thermal conductivity. Under the condition of low moisture content (ω <15%), the fitted curve of mixed sand sample is in good agreement with the experimental data.