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Parametric analysis, response surface, sensitivity analysis, and optimization of a novel spiral-double ground heat exchanger

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Title: Parametric analysis, response surface, sensitivity analysis, and optimization of a novel spiral-double ground heat exchanger
Authors: Serageldin, Ahmed A. Browse this author
Radwan, Ali Browse this author
Katsura, Takao Browse this author →KAKEN DB
Sakata, Yoshitaka Browse this author
Nagasaka, Shigeyuki Browse this author
Nagano, Katsunori Browse this author →KAKEN DB
Keywords: Ground source heat pump
Spiral-double ground heat exchanger
Parametric analysis
Sensitivity analysis
Numerical optimization
Issue Date: 15-Jul-2021
Publisher: Elsevier
Journal Title: Energy conversion and management
Volume: 240
Start Page: 114251
Publisher DOI: 10.1016/j.enconman.2021.114251
Abstract: This paper proposes a novel spiral-double ground heat exchanger (GHX) that decreases conventional construction costs, facilitates installation, promotes heat transfer, and reduces thermal resistance. In this study, a new and effective installation procedure was proposed. Three-dimensional, transient, and conjugated finite volume simulations were conducted to compare the thermo-hydraulic performance of the traditional single U-tube and spiral GHXs with the proposed spiral-double GHX under two different flow rates. Moreover, a parametric analysis was conducted to study the impact of the design, operating, and geological parameters on the thermal performance of the new spiral-double GHX. Finally, surface response and sensitivity analyses, as well as optimization, were carried out using the ANSYS workbench. The comparison revealed that the spiral-double GHX yields higher thermal effectiveness (E) and heat transfer rate (Q) than single-U tubes GHX by 40.8% and 44.1%, respectively. In addition, it has a lower thermal resistance of 75.3% than the single-U tube GHX under turbulent flow conditions. Furthermore, the parametric study and sensitivity analysis concluded that the spiral radius has the most significant impact, followed by flow velocity, tube diameter, and pitch distance. Moreover, the recommended fluid velocity does not exceed 0.21 m/s, pitch distance of 0.0625 m, a spiral radius of 0.2 m, and grout conductivity of 2.1 W/m.K.
Rights: © <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)


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