현장 타설 에너지파일을 적용한 지열 히트펌프 시스템의 성능 예측

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.