Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
권호 표지
DOI QR코드

DOI QR Code

Preliminary Analysis on Design Parameters and Application Effects of Surface Water Heat Exchanger (SWHE)

지표수 열교환기 설계 변수와 적용 효과에 대한 선행 분석

  • 손병후 (한국건설기술연구원 건축도시연구소)
  • Received : 2016.08.08
  • Accepted : 2016.08.29
  • Published : 2016.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

Commercial buildings and institutions are generally cooling-dominated and therefore reject more heat to a borehole ground heat exchanger (BHE) than they extract over the annual cycle. Shallow ponds can provide a cost-effective means to balance the thermal loads to the ground and to reduce the length of BHE. This paper presents the analysis results of the impact of design parameters on the length of SWHE pipe and its application effect on geothermal heat pump (GHP) system using BHE. In order to analysis, we applied ${\varepsilon}-NTU$ method on designing the length of SWHE pipe. Analysis results show that the required pipe length of SWHE was decreased with the increase of approach temperature difference and with the decrease of pipe wall thickness. In addition, when the SWHE was applied to the GHP system, the temperature of BHE was more stable than that of standalone BHE system.

Keywords

References

  1. Lund, J. W. and Boyd, T. L., 2015, Direct utilization of geothermal energy 2015: Worldwide review, World Geothermal Congress 2015, Melbourne, Australia.
  2. Sarbu, I. and Sebarchievici, C., 2014, General review of ground-source heat pump systems for heating and cooling of building, Energy and Buildings, Vol. 70, pp. 441-454. https://doi.org/10.1016/j.enbuild.2013.11.068
  3. Kavanaugh, S., 1998, A design method for hybrid ground-source heat pump, ASHRAE Transactions, Vol. 104, pp. 691-698.
  4. Kavanaugh, S. and Rafferty, K., 2014, Geothermal Heating and Cooling: Design of Ground-Source Heat Pump Systems, ASHRAE, Atlanta.
  5. Chiasson, A., Spitler, J., Rees, S., and Smith, M., 2010, A model for simulating the performance of a shallow pond as a supplemental heat rejector with closed-loop ground-source heat pump system, ASHRAE Transactions, Vol. 106, pp. 107-121.
  6. Kavanaugh, S. and Pezent, M., 1990, Lake water applications of water-to-air heat pumps, ASHRAE Transactions, Vol. 96, pp. 813-820.
  7. Hattemer, B. and Kavanaugh, S., 2005, Design temperature data for surface water heating and cooling systems, ASHRAE Transactions, Vol. 111, pp. 695-701.
  8. Incropera, F. P. and DeWitt, D. P., 1996, Introduction to Heat Transfer, 3rd ed., John Wiley & Sons, Inc.
  9. McCray, B., Kavanaugh, S., and Williamson, D., 2006, Environmental impacts of surface water heat pump systems, ASHRAE Transactions, Vol. 112, pp. 102-110.
  10. Rogers, G. F. C. and Mayhew, Y. R., 1964, Heat transfer and pressure loss in helically coiled tubes with turbulent flow, Int. J. Heat and Mass Transfer, Vol. 7, pp. 1207-1216. https://doi.org/10.1016/0017-9310(64)90062-6
  11. Churchill, S. W. and Chu, H. H. S., 1975, Correlating equations for laminar and turbulent free convection from a horizontal cylinder, Int. J. Heat and Mass Transfer, Vol. 18, pp. 1049-1053. https://doi.org/10.1016/0017-9310(75)90222-7
  12. Sohn, B. and Kwon, H. S., 2014, Performance prediction on the application of a ground-source het pump (GSHP) system in an office building, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 26, No. 9, pp. 409-415. https://doi.org/10.6110/KJACR.2014.26.9.409
  13. Sohn, B., 2012, Performance prediction of geothermal heat pump system by line-source and modified DST (TRNVDSTP) models, Transactions of the Korea Society of Geothermal Energy Engineers, Vol. 8, No. 2, pp. 61-69.
  14. DesignBuilder, 2014, DesignBuilder V3.0.
  15. Gaia Geothermal, 2014, Ground Loop Design Version 8.0.8 for Windows, Gaia Geothermal.

Cited by

  1. 지표수 열교환기 적용 지열 히트펌프 시스템의 냉방 성능 vol.29, pp.6, 2016, https://doi.org/10.6110/kjacr.2017.29.6.316
  2. 하이브리드 지중열교환기 적용 히트펌프 시스템의 냉방 성능 분석 vol.14, pp.4, 2018, https://doi.org/10.17664/ksgee.2018.14.4.0043
  3. 하이브리드 지중열교환기 적용 지열 히트펌프 시스템의 난방 성능 분석 vol.16, pp.3, 2020, https://doi.org/10.17664/ksgee.2020.16.3.008