HR: 1340h
AN: H33H-1723    [Abstracts]
TI: A Comparison Study of Numerical Simulations in a Borehole Heat Exchanger Field
AU: * Kim, S
EM: kskinc@hanmail.net
AF: Seoul National University, Seoul National University, Seoul, 151-747, Korea, Republic of
AU: Bae, G
EM: gokbae@snu.ac.kr
AF: Seoul National University, Seoul National University, Seoul, 151-747, Korea, Republic of
AU: Lee, K
EM: kklee@snu.ac.kr
AF: Seoul National University, Seoul National University, Seoul, 151-747, Korea, Republic of
AU: Shim, B
EM: boshim@kigam.re.kr
AF: Korea Institute of Geoscience and Mineral Resources, Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Korea, Republic of
AU: Song, Y
EM: song@kigam.re.kr
AF: Korea Institute of Geoscience and Mineral Resources, Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Korea, Republic of
AB: Borehole heat exchanger (BHE) field with heat-pump was installed at the building of the Korea Earthquake Research Center in Korea Institute of Geoscience and Mineral (KIGAM). It consists of 28 BHEs equipped with a double U-tube and three monitoring wells. Two BHEs are equipped with optical fiber that measures temperature of the U-tube. A borehole televiewer survey was conducted in four BHEs. The spacing between BHEs is 7 m and the depth of the BHE is 200 m. This geothermal heat-pump system has been operated and monitored since June 2006. We develop a numerical model for BHE field, which can simulate temperature changes in the system with circulating water through the pipe as well as groundwater flow and aquifer temperature changes. This model is based on TOUGH2, a widely accepted three-dimensional numerical simulator for heat and water flow in geothermal systems and verified with the KIGAM data set. Founded on the KIGAM data set, not every BHE need to be operated for air-conditioning of this building at the same time. The spacing in a BHE field is a critical factor for heat exchange efficiency because of thermal interference between BHEs. When some of the BHEs are used, heat exchange efficiency is changed with the selection of BHE array. Using verified model, we find optimal BHE array from six selected cases of the BHE array.
DE: 1832 Groundwater transport
DE: 1846 Model calibration (3333)
DE: 1847 Modeling
SC: Hydrology [H]
MN: 2007 Fall Meeting