An applicable design method for horizontal spiral-coil-type ground heat exchangers

The ground-source heat pump (GSHP) system using a horizontal ground heat exchanger (GHE) can be employed to reduce the installation cost and obtain a balance between efficiency and costs. Among the different types of horizontal GHEs, a spiral-coil-type GHE is one of the advantageous configurations in terms of thermal performance. However, there is no satisfactory guideline to design the horizontal spiral-coil GHEs, though design methods for other types of horizontal GHEs exist. Hence, in this study, a design method is proposed for the horizontal spiral-coil GHEs by modifying the boundary conditions of an existing equation. To verify the applicability of the proposed design equation, a laboratory thermal response test was conducted to validate the finite element model. Then, the validated numerical model was utilized for a computational fluid dynamics (CFD) simulation on an arbitrary building wherein a GSHP system with a horizontal spiral-coil GHE is operated. The entering water temperature (EWT) of 32.09 °C from the simulation result was lower than the design EWT criteria of 32.2 °C, implying that the thermal performance of the GHE for a month of operation is sufficient to cover the building load. The result provides the applicability of the proposed design method.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2018-03
Language
English
Citation

GEOTHERMICS, v.72, pp.338 - 347

ISSN
0375-6505
DOI
10.1016/j.geothermics.2017.12.010
URI
http://hdl.handle.net/10203/238152
Appears in Collection
CE-Journal Papers(저널논문)
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