Interpretation of Temperature Performances at U-Tube Ground Heat Exchangers in Heterogeneous Formations

The performances of U-tube ground heat exchangers (GHEs) in heterogeneous formations were predicted using a newly developed analytical modeling approach based on the cylindrical source function. The modeling procedure transforms the detailed vertical temperature profiles obtained with fiber optical...

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Published inJournal of the Geothermal Research Society of Japan Vol. 28; no. 2; pp. 199 - 210
Main Authors FUJII Hikari, OKUBO Hiroaki, ITOI Ryuichi, KOSUKEGAWA Hiroyuki
Format Journal Article
LanguageEnglish
Japanese
Published 日本地熱学会 2006
THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN
Subjects
fiber optical sensor
groundwater flow
heterogeneous formation
thermal response test
U-tube ground heat exchanger
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ISSN0388-6735
1883-5775
DOI10.11367/grsj1979.28.199

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Abstract The performances of U-tube ground heat exchangers (GHEs) in heterogeneous formations were predicted using a newly developed analytical modeling approach based on the cylindrical source function. The modeling procedure transforms the detailed vertical temperature profiles obtained with fiber optical temperature sensors to thermophysical properties of ground. The vertical distribution of thermal conductivities and heat exchange rates were estimated using a non-linear regression method. The estimated distribution of thermal conductivity correlated well with the geological and groundwater flow conditions at the well location, while the distribution agreed well with the interpretation results in an adjacent GHE completed with a co-axial heat exchanger.
AbstractList The performances of U-tube ground heat exchangers (GHEs) in heterogeneous formations were predicted using a newly developed analytical modeling approach based on the cylindrical source function. The modeling procedure transforms the detailed vertical temperature profiles obtained with fiber optical temperature sensors to thermophysical properties of ground. The vertical distribution of thermal conductivities and heat exchange rates were estimated using a non-linear regression method. The estimated distribution of thermal conductivity correlated well with the geological and groundwater flow conditions at the well location, while the distribution agreed well with the interpretation results in an adjacent GHE completed with a co-axial heat exchanger.
Author OKUBO Hiroaki
KOSUKEGAWA Hiroyuki
FUJII Hikari
ITOI Ryuichi
Author_FL 大久保 博晃
糸井 龍一
小助川 洋幸
藤井 光
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  fullname: KOSUKEGAWA Hiroyuki
  organization: Faculty of Engineering and Resource Science, Akita University | 秋田大学工学資源学部
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Snippet The performances of U-tube ground heat exchangers (GHEs) in heterogeneous formations were predicted using a newly developed analytical modeling approach based...
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StartPage 199
SubjectTerms fiber optical sensor
groundwater flow
heterogeneous formation
thermal response test
U-tube ground heat exchanger
Title Interpretation of Temperature Performances at U-Tube Ground Heat Exchangers in Heterogeneous Formations
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