Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

A Study on the Estimation of Soil Formation Thermal Conductivities and Borehole Resistances with One-Dimensional Numerical Model and In-Situ Field Tests

1차원 수치모델과 현지측정에 의한 지중열전도율 및 보어홀 전열저항 해석에 관한 연구

  • Lee Se-Kyoun (Department of Mechanical Engineering, Chungbuk National Univ.) ;
  • Woo Joung-Son (Korea Institute of Energy Research) ;
  • Ro Jeong-Geun (Cungbuk National Univ.) ;
  • Kim Dae-Ki (Department of Mechanical Engineering Graduate School, Chungbuk National Univ.)
  • Published : 2006.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

A one-dimensional numerical model coupled with parameter estimation is used to predict the effective thermal conductivities of soil formations and borehole resistances from in situ field test data. In this application a new method of using initial ignoring time (IIT) obtained from error estimation is tried and turned out to be successful in determining soil thermal conductivities. This method is used for single-U and double-U borehole system. The results of this method are compared and agreed well with those of existing software (GPM) in the analysis of single-U borehole data. In the analysis of double-U borehole data this method seems to be better in predicting soil and borehole properties.

Keywords

References

  1. Ingersoll, L. R. and Plass, H. J., 1948, Theory of the ground pipe heat source for the heat pump, ASHVE Transactions, Vol. 47, pp.119-121
  2. Carslaw, H. S. and Jaeger, J. C., 1959, Conduction of Heat in Solids, 2nd ed., Claremore Press, Oxford
  3. Shonder, J. A. and Beck, J. V., 1999, Determining effective soil formation thermal properties from field data using. a parameter estimation technique, ASHRAE Transactions, Vol. 105, Pt. 1, pp. 458-466
  4. Yavuzturk, C., 1999, Modeling of Vertical Ground Loop Heat Exchanger for Ground Source Heat Pump Systems, Ph. D. Thesis, Oklahoma State University, Stillwater, OK
  5. Lee, S. K., Kim, D. K., Woo, J. S. and Park, S.I., 2005, A study on the thermal behavior of vertical borehole heat exchanger with 1-dimensional model, Journal of the Korean Solar Energy Society, Vol. 25, No.1, pp.97-104
  6. Claesson, J. and Eskilson, P., 1988, Conductive heat extraction to a deep borehole: Thermal analyses and dimensioning rules, Energy, Vol. 13, No.6, pp.509-527 https://doi.org/10.1016/0360-5442(88)90005-9
  7. Hellstrom, G. and Sanner, B., 2000, PC-programs for borehole heat exchanger design, Asterweg 2, D-35633, Lahnau, Germany
  8. Kavanaugh, S. P., 2000, Investigation of Methods for Determining Soil and Rock Formation Thermal Properties from Short-Term Field Tests, ASHRAE 1118-TRP
  9. Woo, J. S. and Lee, S. K., 2005, A Study on the In-Situ Geothermal Conductivity Testing and Analysis, Final Report to Ministry of Commerce, Industry and Energy, Report No. 2002-N-GE08-P-01