Abstract
Conventional geothermal development has been targeted by either the geothermal fluid reservoir in which steam and hot water are dominant or a deep-seated hot dry rock. However, these geothermal resources are regionally restricted therefore, long-term research development has been necessary to ascertain and establish the achievement of a power generation system by geothermal energy. From the view point of this research background, the development of shallow geothermal resources has been extensively carried out recently because shallow geothermal resources are not only exploited comparatively with ease but also can be found anywhere. The present study aims to investigate the heat extraction characteristics of a coaxial heat exchanger, which is the downhole heat exchangers extracting geothermal energy. From the computed results it was found that the heat extraction performance using a coaxial heat exchanger under the forward circulation mode depended on the inner tube material of the coaxial heat exchanger in the case where the length of the coaxial heat exchanger was comparatively long. Further, it was found that there was not much difference in the heat extraction rate among the metal tubes as long as they were used as the inner tube material.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
