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Effects of Sand-Bentonite Backfill Materials on the Thermal Performance of Borehole Heat Exchangers

机译：膨润土砂子充填材料对钻孔热交换器热性能的影响

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摘要

This article presents a quantitative analysis of the effects of sand-bentonite backfill materials on the thermal performance of borehole heat exchangers (BHEs). Laboratory thermal probe tests were conducted to measure the thermal conductivity of sand-bentonite mixtures under different mixed ratios. Based on microscopic observations, the mechanism of bentonite affecting heat conduction between the sand grains was analyzed. Then field tests were carried out to compare the thermal performance of two double U-shaped BHEs with different backfill materials. Test results showed that the thermal conductivity of sand-bentonite mixtures first increased with increasing percentage of bentonite by dry mass, then reached a peak at the range from 10% to 12%, beyond which the thermal conductivity decreased quickly. For the BHE with an optimal sand-bentonite backfill material, the heat injection and heat extraction rate were enhanced on average by 31.1% and 22.2%, respectively, compared with the case with a common sand-clay material. These results can provide helpful guide for the design of ground source heat pump systems.
机译：本文介绍了一种砂质膨润土回填材料对井壁热交换器（BHE）的热性能影响的定量分析。进行了实验室热探针测试，以测量在不同混合比下砂-膨润土混合物的热导率。在微观观察的基础上，分析了膨润土影响砂粒间热传导的机理。然后进行了现场测试，比较了两种具有不同回填材料的双U型BHE的热性能。测试结果表明，砂土-膨润土混合物的热导率首先随膨润土的干质量百分比的增加而增加，然后在10％至12％的范围内达到峰值，在此之后，热导率迅速下降。与具有最佳砂-膨润土回填材料的BHE相比，与普通砂-粘土材料相比，热注入和吸热率分别平均提高了31.1％和22.2％。这些结果可以为地源热泵系统的设计提供有益的指导。

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  • 来源
    《Heat Transfer Engineering》 |2013年第3期|37-44|共8页
  • 作者

    HUAJUN WANG; YAHUI CUI; CHENGYING QI;

  • 作者单位

    School of Energy and Environment Engineering, Hebei University of Technology, No. 8 Guangrong- dao, Hongqiao District, Tianjin, 300130 China;

    School of Energy and Environment Engineering, Hebei University of Technology, Tianjin, China;

    School of Energy and Environment Engineering, Hebei University of Technology, Tianjin, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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