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http://dx.doi.org/10.5762/KAIS.2016.17.3.24

A Study on the Thermal Characteristics of Horizontal Ground Heat Exchanger using Thermal Response Test  

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
Journal of the Korea Academia-Industrial cooperation Society / v.17, no.3, 2016 , pp. 24-30 More about this Journal
Abstract
Vertical and standing column well ground heat exchangers have mostly been installed for ground source heat pump systems (GSHP) and thermal response tests (TRT) have been applied to evaluate the thermal characteristics for these heat exchangers. In this paper, the TRT coupled with a line source method was applied to evaluate the thermal characteristics of the horizontal ground heat exchanger (HGHX). Load tests of a HGHX were also performed to examine the daily variations of the ground and fluid temperatures associated with the daily intermittent operation of GSHP. For this test, the straight HGHX (depth 2 m, length 50 m, 8 line) was installed in Ansan city. The results showed that the variations of ground thermal conductivity of HGHX during one year were relatively small with the range of $1.43{\sim}1.64W/m{\cdot}K$, and the maximum and minimum values appeared in December and May, respectively. Load tests with heat injection rate of 6.0 kW for 10 hours per day to HGHX during twelve days were performed in June, September and December, and resulted in a ground initial temperature rise of $4.31^{\circ}C$, $3.14^{\circ}C$, and $1.21^{\circ}C$ during these days, respectively.
Keywords
Thermal response test(TRT); Ground thermal conductivity; Horizontal ground heat exchanger(HGHX); Ground source heat pump system(GSHP);
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Times Cited By KSCI : 3  (Citation Analysis)
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1 Park. Y. J., and Kang. S. H., Performance analysis of the horizontal ground source heat pump for greenhouse, Proceedings of the SAREK, 2011, Winter Annual Conference, pp. 447-452, 2011.
2 Sohn, B.G., Performance analysis of ground- coupled heat pump system with slinky-type horizontal heat exchanger, KJACR, Vol. 24. No. 3, pp. 230-239, 2012. DOI: http://dx.doi.org/10.6110/KJACR.2012.24.3.230   DOI
3 Sanner, B., Hellstrom, G., Spitler, J., and Gehlin, S., More than 15 years of mobile thermal response test - a summary of experiences and prospects, Proceeding European geothermal congress, Pisa, Italy, 2013.
4 Gehlin S.E.A., Thermal response test - method development and evaluation, PhD thesis, Lulea University, Sweden, 2002.
5 Beier RA, Smith M.D., Spliter J.D., Reference data sets for vertical borehole ground heat exchanger models and thermal response test analysis, Geothermics 40, pp. 79-85, 2011. DOI: http://dx.doi.org/10.1016/j.geothermics.2010.12.007   DOI
6 Lee, S.K., Woo, J.S., and Kim, D.G., 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, 2008.
7 Chang, K.S. and Kim, M.J., A study on the determining initial ignoring time for the analysis of ground thermal conductivity of SCW type ground heat exchanger, Korean Journal of Air-Conditioning and Refrigeration Engineering, 26(10), pp. 453-459, 2014. DOI: http://dx.doi.org/10.6110/KJACR.2014.26.10.453   DOI