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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Evaluation of Measurement Accuracy of Underground Thermometers Using Steel-Pipe Piles
Author(s)
Masahito Oguma, Ayako Funabiki and Mitsuru Endo
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DOI:10.17265/1934-8975/2016.07.001
Affiliation(s)
Department of Mechanical Engineering, College of Engineering, Nihon University, Koriyama 963-8642, Japan
ABSTRACT
For ground source heat
utilization systems, pile heat exchangers are sometimes used. In order for
these systems to achieve high performance, control of the system dynamics is
important, and the underground temperature must be known. Typically, underground
temperature is measured using a thermometer in a borehole. However, in the case
of pile heat exchangers, a different method is required, making the system
expensive to set up. To overcome this problem, the installation of underground
thermometers in the heat exchanger piles themselves is proposed in the present
study. The proposed thermometer system consists of thermocouples packed in
grout such as silica sand within the piles. However, there is a possibility of
measurement errors due to vertical thermal conduction in the steel pipes, and
it is important to estimate the measurement accuracy before the development of
this system. In the present study, the measurement accuracy is estimated using
numerical simulations and then confirmed experimentally. The underground
temperature profiles inside and outside the pile are compared. The results
indicate that the proposed system offers sufficient accuracy for application to
pile heat exchangers.
KEYWORDS
Heat conduction, underground thermometer, pile heat exchanger.
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