Effect of tube-in-tube configuration on thermal performance of coaxial-type ground heat exchanger SCIE SCOPUS

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Title
Effect of tube-in-tube configuration on thermal performance of coaxial-type ground heat exchanger
Author(s)
Lee, Seokjae; Park, Sangwoo; Kang, Minkyu; Oh, Kwanggeun; Choi, Hangseok
KIOST Author(s)
Lee, Seokjae(이석재)
Alternative Author(s)
이석재
Publication Year
2022-09
Abstract
Among various types of ground heat exchangers (GHEXs or GHEs), a coaxial-type GHEX exhibits outstanding thermal performance owing to the geometric characteristics of the concentric tube-in-tube configuration. In this study, the unique configuration of the coaxial-type GHEX was investigated through parametric studies, which provided the energy efficient configuration. A computational fluid dynamics (CFD) model was developed and verified by using the field test results for the coaxial-type GHEX constructed in a test bed. Then, the parametric studies were conducted using the developed CFD model for various influential factors (i.e., flow rate of a circulating fluid, hydraulic diameter, and thermal conductivities of inner pipe and bentonite grout), which were selected considering the tube-in-tube configuration. The thermal performance of the coaxial-type GHEX increased with an increase in the flow rate of a circulating fluid and the thermal conductivity of bentonite grout. In addition, the inner pipes of the coaxial-type GHEX should be composed of materials with a thermal conductivity lower than 0.025 W/(m⋅K) to relieve thermal interference between the outer and inner pipes. Notably, it was concluded that the coaxial-type GHEX should be designed to secure the sufficient heat exchangeable area and retention capacity of the circulating fluid.
ISSN
0960-1481
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43134
DOI
10.1016/j.renene.2022.07.088
Bibliographic Citation
Renewable Energy, v.197, pp.518 - 527, 2022
Publisher
Pergamon Press Ltd.
Keywords
Computational fluid dynamic (CFD) model; Parametric study; Coaxial-type ground heat exchanger (GHEX); Turbulent flow; Thermal performance
Type
Article
Language
English
Publisher
Pergamon Press Ltd.
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