| Title |
Thermal Influential Factors of Energy Pile |
| Keywords |
energy pile;thermal conduction;heat exchange rate;fluid velocity;8-16 hours operation;에너지 파일;열전달;열교환율;유속;8-16 시간 운용 |
| Abstract |
This paper presents the thermal conduction analysis (using ABAQUS ver 6.10 and FLUENT ver 6.3.26) of geothermal energy for PHC, steel and copper energy piles by considering subsurface environment, thermal efficiency of grouting materials, and fluid velocity of circulating fluid. Results show that higher thermal efficiency for copper pile is observed followed by steel and PHC piles depending on the grouting materials and subsurface condition. The fluid velocity of 0.6㎧ presents most efficient outflow temperature (275.4K) and heat exchange rate (103.1 W/m) for the case of PHC pile during 8 hours operation. Analysis of operation schedule concludes that 16 hours of stand-by allows charging geothermal energy following 8 hours operation in winter season is most appropriate with 0.1 K of temperature difference from the steady-state condition. |