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In this study, a series of CFD analysis was performed in order to predict the leaving water temperature and the slope of in-situ thermal response tests of the vertical-type geothermal heat exchangers. The geothermal heat exchanger and surrounding ground formation were modeled using GAMBIT and simulation was used by utilizing FLUENT which is commercial CFD code. Comparing with the results of CFD and in-situ thermal response tests, the results of CFD was presented good agreement with 0.5℃ difference of Leaving Water Temperature and with 1.6% difference of the Slope. Key Words : CFD(Computational Fluid Dynamics), Ground Heat Pump System, In-Situ Thermal Response Test, Vertical-type Geothermal Heat Exchanger   2011     . * Corresponding Author : Hee-Sang Lee(Incheon Univ.)Tel: +82-32-835-8682 email: hslee@incheon.ac.krReceived April 19, 2013 Revised (1st June 12, 2013, 2nd June 24, 2013) Accepted July 11, 2013 1.  1.1

The Comparison of the In-Situ Thermal Response Tests and CFD Analysis of Vertical-type Geothermal Heat Exchanger