Performance Evaluation of Closed Co-axial Ground Heat Exchanger in the case of 2000m-Depth Single Well

2000m 단일 시추공에서 밀폐 동축 방식 지중 열교환기의 취득온도 성능평가

  • Received : 2016.05.18
  • Accepted : 2016.07.04
  • Published : 2016.08.31


The Korean government has been making efforts to use renewable energy to reduce the consumption of fossil fuels for the heating system in greenhouses. The number of greenhouses that installed a geothermal heat pump system is 201 EA with the volume of 132.8 ha and 108,467kW from 2010-2014. The geothermal system, called a shallow geothermal system, with the temperature of $10-20^{\circ}C$ has accessories composed of a BHE and heat pump. Moreover, it is necessary to have a wide area to install the BHE and to drill to the depth of 200 m. On the other hand, even though the deep geothermal system needs a high drilling cost to obtain the temperature of $40-150^{\circ}C$, the system has the advantages of the small area required for the BHE and operation without a heat pump. In this study, the temperature of the return water and heat capacity were measured to obtain the geothermal energy efficiently on the condition of the water flow being changed in the BHE. The temperature according to the return water changes through the heat conduction based on the increase of ground temperature up to the underground depth has been calculated to conduct a simulation and is compared with the field experiment test results.


Deep Geothermal;Heat Exchanger;Heat Gain;Flow Velocity;Green House


  1. Ryoo. Y. S., "A Study on the Loadsharing for Geothermal Heatpump System and Boiler in Horticultural Greenhouse," Rural Research Institute, 11-D150769-000025-01, pp.8-13, 2012.
  2. Kim. S. S., 'A Study on the Heat Pump System by Using Geothermal Energy', A Thesis for Master Degree, Gyeong Sang National University, Republic of Korea, 2010.
  3. Thoe, B., Aspinwall, K. and Wise, H., "Review on Ultrasonic Machining," International Journal of Machine Tools and Manufacture, Vol. 38, No. 4, pp. 239-255, 1998.
  4. Kim, H. C., Lee, Y, M., 'Heat flow in the Republic of KOREA', Journal of Geophysical Research, Vol. 112, pp. 266. 2007.
  5. Song, J. Y., "A Study on Control Characteristic and Thermal Environmental Analysis of Automatic Thermostatic Valves for Radiant Panel HEATING System in Residential Apartments", A Thesis for a Master Degree, Kyung Won University, 2006.
  6. Jang, B. H., and Lee, K. H., "A Numerical Analysis for the Performance Improvement of a Channel Heat Exchanger," Translation of International Standard Book, Vol. 978-1, pp. 158-162, 2012.
  7. Lee, C. H., Kim, D. M., Yang, H. S., and Kim, S. H., "Design and Analysis of Cryogenic Turbo Expander for HTS Power Cable Refrigeration System," Journal of The Korean Society of Manufacturing Process Engineers, Vol. 14, No. 3, pp. 141-148, 2015.
  8. Park, S., Kim, K. G., Kim, D. J., Park, H. Y., and Kwak, H. S., "Computational Thermo-Fluid Analysis for the Effects of Helium Injection Method on Glass Fiber Cooling Process in an Optical Fiber Manufacturing System," Journal of The Korean Society of Manufacturing Process Engineers, Vol. 13, No. 2, pp. 124-130, 2014.
  9. Chung, S. W., "Thermal Insulation Property due to Internal Air-layer Content of Warm Multi Layer Materials By using Numerical Analysis," Journal of The Korean Society of Manufacturing Process Engineers, Vol. 11, No. 4, pp. 97-103, 2012.
  10. Chung, S. W., Kim, D. K., and Gong, S. H., "Development of Electrical and Oil Heater for Energy Saving," Journal of The Korean Society of Manufacturing Process Engineers, Vol. 10, No. 5, pp. 38-43, 2011.


Supported by : 농림수산식품기술기획평가원(iPET)