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 Heating Performance of Ground Source Heat Pump System

지중열원 열펌프 시스템의 난방성능 해석

  • 우정선 (한국에너지기술연구원) ;
  • 김대기 (충북대학교 기계공학과 대학원) ;
  • 이세균 (충북대학교 기계공학부)
  • Published : 2004.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Installations of vertical boreholes for the ground source heat pump system are expensive to install. One way to reduce the initial cost is to increase the specific heat extraction rate of borehole system. However, as the specific heat extraction rate increases the temperature of borehole fluid decreases with the resultant lower Coefficient Of Performance in Heating(COPH) of heat pump system. The purpose of this study is to provide the basic informations about the performance of heat pump system with the specific heat extraction rate and soil thermal properties such as thermal conductivity and temperature. It is shown that the specific heat extraction rate is the most important parameter for the ground source heat pump system. To obtain the reasonable COPH value (COPH > 3) the heat extraction rate should be about 25 W/m or less. Accurate measurements of soil thermal properties are also very important to design the system properly. The effects of borehole thermal resistances are also examined in this study.

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.119-122
  2. Carslaw, H. S. and Jaeger, J. C., 1959, Conduction of Heat in Solids, 2nd ed., Clarendon Press, Oxford
  3. Eklof, C. and Gehlin, 5., 1996, TED-A Mobile Equipment for Thermal Response Test, Master's Thesis, Lulea University of Technology, Sweden
  4. Claesson J. and Eskilson P., 1988, Conductive heat extraction to a deep borehole:Thermal analysis and dimensioning rules, Energy, Vol. 13, No.6, pp.509-527
  5. Kavanaugh, S. P., 2000, Investigation of Methods for Determining Soil and Rock Formation Thermal Properties from Short-Term Fields Tests, ASHRAE 1118-TRP
  6. Reistad, G. M. and Means, P., 1980, Unitary water-source heat pumps for geothermal applications: Availability, performance and design, Geothermal Resources Council, Transactions, Vol. 4, pp. 601-604
  7. Reistad, G. M., Yao, B. and Gunderson, M., 1978, A thermodynamic study of heating with geothermal energy, ASME Journal of Engineering for Power, Vol. 100, pp. 503-510
  8. Lee, S. K. and Reistad, G. M., 1985, Thermodynamic analysis of geothermal energy systems with forced recovery from aquifers, ASME Journal of Energy Resources Technology, Vol. 107, pp. 113-121 https://doi.org/10.1115/1.3231148