Thermal performance design and analysis method for energy cast-in-place piles (E-CIPs) installed in diaphragm walls SCIE SCOPUS

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Title
Thermal performance design and analysis method for energy cast-in-place piles (E-CIPs) installed in diaphragm walls
Author(s)
Lee, Seokjae; Han, Taek Hee; Park, Sangwoo; Hwang, Chaemin; Choi, Hangseok
KIOST Author(s)
Han, Taek Hee(한택희)
Alternative Author(s)
한택희
Publication Year
2023-10
Abstract
The diaphragm wall is a temporary supporting structure installed to prevent the collapse of excavation surfaces and groundwater leakage while conducting deep excavations. In a diaphragm wall system, cast-in-place piles (CIPs) are usually installed in a row, comprising deformed rebars and H-beams. In this study, a novel geothermal energy structure, called an energy CIP (E-CIP), was devised to use a diaphragm wall as a ground heat exchanger; E-CIPSP consisting of steel pipes substituting for deformed rebars and E-CIPDI consisting of double-I-beans substituting for H-beams, respectively. In addition to the role of temporary support, heat exchange with ground formations was induced by circulating a working fluid through the hollow space inside the steel pipes of E-CIPSP or the closed double-I-beams of E-CIPDI. Based on a series of thermal performance tests, both the E-CIPSP and E-CIPDI installed in the test bed demonstrated stable heat exchange performance. In addition, a computational fluid dynamics (CFD) model for the E-CIPSP was developed by calibrating the thermal conductivity of the ground formations, which allows to develop a design method for the E-CIPSP installed within a diaphragm wall.
ISSN
0378-7788
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/44461
DOI
10.1016/j.enbuild.2023.113372
Bibliographic Citation
Energy and Buildings, v.296, 2023
Publisher
Elsevier BV
Keywords
Energy cast-in-place pile (E-CIP); Steel pipe heat exchanger (SPHX); Double-I-beam (DIB); Thermal performance test (TPT); Computational fluid dynamics (CFD) model
Type
Article
Language
English
Document Type
Article
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