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Analysis of effective thermal conductivity stability of geothermal heat exchanger according to ambient environmental conditions
Author(s) -
You Jangyoul,
Lee Changhee
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4733
Subject(s) - thermal conductivity , geothermal gradient , heat exchanger , petroleum engineering , thermal conduction , geothermal energy , environmental science , groundwater , thermal , nuclear engineering , geothermal heating , mechanics , materials science , thermodynamics , geotechnical engineering , geology , engineering , mechanical engineering , composite material , geophysics , physics
Summary At present, geothermal energy is a promising research area but still has numerous areas to be explored. The thermal performance verification of U‐shaped closed geothermal heat exchange was proposed to improve the effective thermal conductivity value applying initial ignoring time (IIT). To verify the thermal performance of the underground heat exchanger in the rock layer according to the surrounding environment and groundwater conditions, verifications were conducted for the amount of circulating water, amount of heat input, and groundwater conditions. The circulating fluid flow rate of the system, supply of water into the ground, and influence of the change of supplied heat source were analyzed. The effective heat conduction characteristics were analyzed using the linear heat source model and initial exclusion time. Therefore, in the thermal response test, the main error occurs according to the determined initial removal time, and the reliability of the effective thermal conductivity value is increased by applying IIT to reduce this error.