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Thermal Conductivity Measurement of Grouting Materials for Geothermal Heat Exchanger  

Lim Hyo Jae (Department of Mechanical Engineering, Hoseo University)
Kong Hyoung Jin (Graduate School, Department of Mechanical Engineering, Hoseo University)
Song Yoon Seok (Graduate School, Department of Mechanical Engineering, Hoseo University)
Park Seong Koo (Geotech Inc.)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.4, 2005 , pp. 364-369 More about this Journal
Abstract
An experimental study was conducted on the thermal conductivity of various grouting materials for geothermal heat exchanger which is used as a heat sink or source in the heat pump system. The grouting of the vertical heat exchanger is important for environmental and heat transfer reasons and is generally accomplished by the placement of a low permeability material into the annular space between the borehole wall and the pipes suspended in the borehole. In this study, a lab scale test apparatus was made and measured the thermal conductivity of four grouting materials. As a result, the temperature rising tendency was similar among them, but the increasing rate was different. Thus the thermal conductivity showed a maximum difference of $27\%$ among grouting materials.
Keywords
Ground source heat pump; Geothermal heat exchanger; Grouting material; Thermal conductivity;
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  • Reference
1 Yavuzturk, C., 1999, Modeling of vertical ground loop heat exchangers for ground source heat pump systems, Ph.D. thesis, Oklahoma State University, Stillwater, OK, U.S.A
2 Austin, W. A. Ill, 1998, Development of an in-situ system for measuring ground thermal properties, MS thesis, Oklahoma State University, Stillwater, OK, U.S.A
3 Yavuzturk, C. and Spitler, J. D., 1999, A short time step response factor model for vertical ground loop heat exchangers, ASHRAE Transactions, Vol. 105, Part 2, pp. 540-550
4 Kavanaugh, S. P. and Rafferty, K., 1997, Ground source heat pumps - Design of geothermal systems for commercial and institutional buildings, Proceedings of the ASHRAE, Atlanta Georgia, pp.22-34
5 Hiller, C., 2000, Grouting for vertical geothermal heat pump systems, 1st ed., IGSHPA, Oklahoma State University, pp.25-43