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Thermal Conductivity Measurement of Sand-Water Mixtures Used for Backfilling Materials of Vertical Boreholes or Horizontal Trenches  

Sohn, Byong-Hu (Fire and Engineering Services Research Center, KICT)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.20, no.5, 2008 , pp. 342-350 More about this Journal
Abstract
This paper presents the results of a laboratory study on the thermal conductivity of sand (silica, quartzite, limestone and masonry sand)-water mixtures used in ground heat exchanger backfilling materials. Nearly 150 tests were performed in a thermal conductivity measuring system (TPSYS02) to characterize the relationships between the thermal conductivity of mixtures and the water content. The results show that the thermal conductivity of mixtures increases with increasing dry density and with increasing water content. The results also show that for constant water contents and a dry density value, the thermal conductivity of mixtures increases with increasing thermal conductivity of solid particles. The measurement results were also compared with the most widely used empirical prediction models for the thermal conductivity of soils.
Keywords
thermal conductivity; Sand-water mixture; Ground heat exchanger; Backfilling material; Transient hot probe method;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
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