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A Study of the Effect of Borehole Thermal Resistance on the Borehole Length  

Lee, Se-Kyoun (Dept. of Mechanical Eng., Chungbuk National University)
Woo, Joung-Son (Korea Institute of Energy Research)
Publication Information
Journal of the Korean Solar Energy Society / v.29, no.5, 2009 , pp. 20-27 More about this Journal
Abstract
The effect of borehole thermal resistance on the borehole length is studied. In performing this work a new concept BLRR(borehole length reduction rate) is developed based on the line source model. The solution of line source model is shown to be valid through the comparison with the data of thermal response test. It is shown that BLRR is a function of soil thermal conductivity(k) and borehole thermal resistance($R_b$). The value of BLRR increases with increasing k, which means reducing $R_b$ is more effective when k is high. The reduction of borehole length with change of $R_b$ is easily estimated with BLRR. The validity of BLRR is also examined with EED analysis.
Keywords
Ground Source Heat Pump System; borehole; Soil Thermal Conductivity; Borehole Thermal Resistance; Borehole Length Reduction Rate;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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