TY - GEN
T1 - Comprehensive study on construction and design method for cast-in-place energy piles
AU - Park, Sangwoo
AU - Lee, Seokjae
AU - Oh, Kwanggeun
AU - Choi, Hangseok
AU - Jung, Kyoungsik
N1 - Funding Information:
This research was supported by National Research Foundation of Korea Government (NRF-2017R 1C1B5017580) and by Korea Institute of Energy Technology Evaluation and Planning (KETEP), Ministry of Knowledge Economy (No. 20153030111110).
Publisher Copyright:
Copyright © 11th Inter. Conf. on Geos. 2018, ICG 2018. All rights reserved.
PY - 2018
Y1 - 2018
N2 - The Ground Source Heat Pump (GSHP) system has been regarded as the most effective heating and cooling system that uses geothermal energy to improve the thermal performance of heat pump and reduce energy consumption. For inducing heat exchange with ground, closed-loop vertical Ground Heat Exchangers (GHEXs) in the underground are generally coupled with heat pump units. Since conventional GHEXs are commonly constructed adjacent to the target buildings, they require additional borehole drilling and extra construction area, which causes a relatively high construction cost. Meanwhile, an energy pile can be an economical alternative to the conventional GHEXs, because it can significantly reduce initial construction costs by encasing heat exchange pipes inside existing pile foundations. In this paper, comprehensive study on the construction and design method for cast-in-place energy piles was carried out. First, six cast-in-place energy piles, which contain various configurations of heat exchange pipes, were constructed in a test bed. In order to investigate the thermal performance and thermo-mechanical behavior of cast-in-place energy piles, a series of in-situ tests (i.e., thermal response tests, thermal performance tests, and thermally-induced stress evaluation) were performed. From the results of in-situ tests, significant influence factors and overall procedure for designing and constructing cast-in-place energy piles were suggested. Finally, two-year heating and cooling operations for an office space were continually monitored to experimentally verify the applicability of cast-in-place energy piles. In addition, the economic feasibility of cast-in-place energy piles compared to the conventional GHEXs was evaluated.
AB - The Ground Source Heat Pump (GSHP) system has been regarded as the most effective heating and cooling system that uses geothermal energy to improve the thermal performance of heat pump and reduce energy consumption. For inducing heat exchange with ground, closed-loop vertical Ground Heat Exchangers (GHEXs) in the underground are generally coupled with heat pump units. Since conventional GHEXs are commonly constructed adjacent to the target buildings, they require additional borehole drilling and extra construction area, which causes a relatively high construction cost. Meanwhile, an energy pile can be an economical alternative to the conventional GHEXs, because it can significantly reduce initial construction costs by encasing heat exchange pipes inside existing pile foundations. In this paper, comprehensive study on the construction and design method for cast-in-place energy piles was carried out. First, six cast-in-place energy piles, which contain various configurations of heat exchange pipes, were constructed in a test bed. In order to investigate the thermal performance and thermo-mechanical behavior of cast-in-place energy piles, a series of in-situ tests (i.e., thermal response tests, thermal performance tests, and thermally-induced stress evaluation) were performed. From the results of in-situ tests, significant influence factors and overall procedure for designing and constructing cast-in-place energy piles were suggested. Finally, two-year heating and cooling operations for an office space were continually monitored to experimentally verify the applicability of cast-in-place energy piles. In addition, the economic feasibility of cast-in-place energy piles compared to the conventional GHEXs was evaluated.
KW - Cast-in-place energy pile
KW - Design of energy pile
KW - Ground heat exchanger
KW - Thermal performance of energy pile
KW - Thermal response test
UR - http://www.scopus.com/inward/record.url?scp=85099551349&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85099551349
T3 - 11th International Conference on Geosynthetics 2018, ICG 2018
SP - 2365
EP - 2372
BT - 11th International Conference on Geosynthetics 2018, ICG 2018
PB - Korean Geosynthetics Society
T2 - 11th International Conference on Geosynthetics 2018, ICG 2018
Y2 - 16 September 2018 through 21 September 2018
ER -