Thermal performance evaluation and parametric study of a horizontal ground heat exchanger

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A ground-source heat pump (GSHP) system uses a relatively constant ground temperature to emit heat in summer and to obtain heat during winter for heating and cooling energy. Among diverse GSHP systems, in designing a closed horizontal system, it is important to accurately estimate the thermal performance of the horizontal ground heat exchanger (GHE). Therefore, in this study, we investigated the performance of a horizontal GHE via experiments and numerical analyses. Thermal response tests (TRTs) were conducted to evaluate heat exchange rates by using horizontal slinky-and spiral-coil-type GHEs installed in a 5 m x 1 m x 1m steel box filled with dried Joomunjin sand. Numerical analyses were conducted for verification with experimental results and a parametric study of affecting parameters on horizontal GHE. The results of the TRTs and the numerical analyses were well matched, and coil-type GHEs were found to perform better than the horizontal slinky-type GHEs. Our results show that, among horizontal GHE design parameters, GHE type and soil thermal conductivity are the main factors to determine the heat exchange rate of a GHE, whereas the pipe diameter does not have any effect on the GHE performance.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2016-03
Language
English
Article Type
Article
Keywords

CONDUCTIVITY; SIMULATION

Citation

GEOTHERMICS, v.60, pp.134 - 143

ISSN
0375-6505
DOI
10.1016/j.geothermics.2015.12.009
URI
http://hdl.handle.net/10203/207943
Appears in Collection
CE-Journal Papers(저널논문)
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