Experimental Study on Thermo-Mechanical Behavior of a Novel Energy Pile with Phase Change Materials Using Fiber Bragg Grating Monitoring

Hongzhi Cui, Jiaxin Shi, Haixing Li, Xiong Xiao, Peng Peng () and Xiaohua Bao
Additional contact information
Hongzhi Cui: Key Laboratory of Coastal Urban Resilient Infrastructures of the Ministry of Education, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Jiaxin Shi: Key Laboratory of Coastal Urban Resilient Infrastructures of the Ministry of Education, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Haixing Li: Key Laboratory of Coastal Urban Resilient Infrastructures of the Ministry of Education, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Xiong Xiao: Key Laboratory of Coastal Urban Resilient Infrastructures of the Ministry of Education, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Peng Peng: Key Laboratory of Coastal Urban Resilient Infrastructures of the Ministry of Education, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Xiaohua Bao: Key Laboratory of Coastal Urban Resilient Infrastructures of the Ministry of Education, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China

Sustainability, 2023, vol. 16, issue 1, 1-26

Abstract: The combination of phase change materials (PCMs) with building materials is a flourishing technology owing to the low-temperature change of the materials during phase change and the potential for enhanced heat storage and release. In this study, a new type of PCM energy pile, in which 20 stainless steel tubes (22 mm in diameter and 1400 mm in length) filled with paraffin were bound to heat exchange tubes, was proposed. An experimental system monitored by a fiber Bragg grating (FBG) to study the thermo-mechanical behavior of energy piles and surrounding soil was established. Both the PCM pile and the ordinary pile, with the same dimensions, were tested under the same experimental conditions for comparison. The results indicate that the temperature sensitivity coefficient calibration results of the FBG differ from the typical values by 8%. The temperature variation is more obvious in the ordinary pile and surrounding soil. The maximum thermal stress of the ordinary energy pile is 0.5~0.6 times larger than that of the PCM pile under flow rates ranging from 0.05 m 3 /h to 0.25 m 3 /h. The magnitudes of the pore water pressure and soil pressure variations were positively correlated with the flow rates.

Keywords: PCM energy piles; model tests; saturated sand; Fiber Bragg Grating (FBG); thermo-mechanical behavior (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/2071-1050/16/1/206/pdf (application/pdf)
https://www.mdpi.com/2071-1050/16/1/206/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:16:y:2023:i:1:p:206-:d:1307523

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().