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http://dx.doi.org/10.6110/KJACR.2014.26.10.453

A Study on the Determining Initial Ignoring Time for the Analysis of Ground Thermal Conductivity of SCW Type Ground Heat Exchanger  

Chang, Keun-Sun (Department of Mechanical Engineering, SunMoon University)
Kim, Min-Jun (Department of Mechanical Engineering, Graduate School of SunMoon University)
Kim, Young-Jae (Department of Environmental and Bio-chemical Engineering, SunMoon University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.26, no.10, 2014 , pp. 453-459 More about this Journal
Abstract
This paper presents an analysis on the initial ignoring time of SCW type GHX using Mean Square Error method. Line source method is a useful method for estimating the ground thermal conductivity for the vertical type and SCW type GHX in Korea. The line source method for ground thermal conductivity of geothermal in-site test is the basis of linear approximation between the temperature of a borehole and logarithmic time in a GHX. To apply the line source method to the estimation of SCW type GHX, it is necessary to ignore the initial time of data at the stage of a linear approximation. This paper proposed a new initial ignoring time of SCW type GHX among various initial ignoring time at the time for reaching MSE of $0.02^{\circ}C^2$.
Keywords
SCW(Standing Column Well); GHX(Ground heat exchanger); Mean Square Error method; Line source method; Ground thermal conductivity;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Ministry of Knowledge Economy, 2012, Standards of support, Installation, and Management for New and Renewable Energy System, Ministry of Knowledge Economy Announcement, 2012-3.
2 Gehlin, S. E. A., 2002, Thermal response test -method development and evaluation, Ph.D Thesis, Lulea University of Technology, Lulea, Sweden,
3 Ingersoll, L. R., Adler, F. T., Plass, H. J., and Ingersoll, A.C., 1951, Theory of earth heat exchangers for the heat pump, ASHVE Transaction, Vol. 57, pp. 167-188.
4 Lee, S. K., Woo, J. S., and Kim, D. G., 2008, A study of Determining Initial Ignoring Time of Line Source Model used in Estimating the Effective Soil Formation Thermal Conductivities. Journal of Energy Engineering, Vol. 17, No. 3, pp. 167-174.   과학기술학회마을
5 Kim, M. J. and Choi, C. H., 2013, A study on the KS (Korea Standard) of SCW type ground heat exchanger, Journal of Geothermal Energy, Vol. 9, No. 4, pp. 39-46.
6 Choi, H. S., Choi H. J., Lee, C. H., and Yun, M. S., 2013, A assessment ground thermal conductivity for SCW type ground heat exchanger design, Journal of Geothermal Energy, Vol. 9, No. 3, pp. 67-73.
7 Kim, M. J. and Chang, K. S., 2013, SCW type ground heat exchanger analysis using borehole photo shoot, Journal of Geothermal Energy, Vol. 9, No. 4, pp. 47-54.