期刊
GEOTHERMICS
卷 38, 期 4, 页码 399-406出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.geothermics.2009.06.002
关键词
Geothermal; Thermal conductivity; Optical fiber thermometer; Groundwater flow; Thermal response test; Ground heat exchangers
资金
- Japan Society for the Promotion of Science [19360407]
- Grants-in-Aid for Scientific Research [19360407] Funding Source: KAKEN
As part of a new thermal response test (TRT) and to determine ground thermal conductivities, vertical temperature profiles were obtained using retrievable optical fiber sensors inserted into the U-tubes of two ground heat exchangers (GHEs) installed at Maebaru City (Fukuoka, Kyushu) and Kushiro City (Hokkaido), Japan. Measured profiles and outlet temperatures from TRTs were history-matched with the cylindrical source function. Nonlinear regression was used to estimate the vertical distribution of ground thermal conductivities. The computed distribution is consistent with measured data indicating both the reliability of the optical fiber thermometer and TRT interpretation. It is expected that TRTs and optical fiber thermometers will prove to be increasingly useful for optimizing the depth of the GHEs installed in heterogeneous formations. and consequently will minimize installation costs of geothermal heat pump systems. (C) 2009 Elsevier Ltd. All rights reserved.
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