| Title |
Performance Prediction of Geothermal Heat Pump(GHP) System Using Cast-in-Place Energy Piles |
| Authors |
손병후(Byonghu Sohn) ; 정경식(Kyung-Sik Jung) ; 최항석(Hangseok Choi) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2013.25.1.028 |
| Keywords |
현장 타설 에너지파일 ; 지중열교환기 ; 지열 히트펌프 시스템 ; 냉난방 성능 ; 동특성 시뮬레이션 Cast-in-place energy pile ; Ground heat exchanger ; Geothermal heat pump system ; Cooling and heating performance ; Transient simulation |
| Abstract |
The aim of this study is to evaluate the performance of the GHP system with 45 cast-in-place energy piles(CEP) for a commercial building. In order to demonstrate the feasibility of a sustainable performance of the system, transient simulations were conducted over 1-year and 20-year periods, respectively. The 1-year simulation results showed that the maximum and minimum temperatures of brine returning from the CEPs were 23.91℃ and 6.66℃, which were in a range of design target temperatures. In addition, after 20 years’ operation, these returning temperatures decreased to 21.24℃ and 3.68℃, and finally reached to stable state. Annual average extraction heat of cast-in-place energy piles was 94.3 MWh and injection heat was 65.7 MWh from the 20 years of simulation results. Finally, it is expected this GHP system can operate with average heating SPF of more than 3.45 for long-term. |