Heat transfer performance of a deep ground heat exchanger for building heating in long-term service

Chao Li, Yanling Guan, Jianhong Liu, Chao Jiang, Ruitao Yang and Xueming Hou

Renewable Energy, 2020, vol. 166, issue C, 20-34

Abstract: Based on an experimental project of a deeply buried coaxial double-pipe with a burial depth of 2539 m in Xi’an, Shaanxi Province, China, this study gave due consideration to the symmetry of a buried pipe structure, built a full-scale axisymmetric model for heat transfer inside and outside the coupled pipe, and verified the reliability of the model. The vertical initial temperature distribution, lithology, and thermophysical parameters of the surrounding ground of the buried pipe in the model came from the optical fiber temperature measurement of the vertical borehole wall, the interpretation of drilling data, and the experimental detection of drilling cores, respectively. This study discusses the variations in ground temperature and thermal effective radius with time in the 50-year service process of the buried pipe based upon the model, explored the heat transfer performance of the buried pipe under different constant heat transfer loads and inlet water temperatures, and analyzed the attenuation rules of its water temperature or heat transfer capacity in long-term service.

Keywords: Deep buried coaxial double-pipe; In-situ experiment; Optical fiber temperature measurement; Long-term service; Heat transfer performance; Thermal effective radius (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (17)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148120318632
Full text for ScienceDirect subscribers only

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:eee:renene:v:166:y:2020:i:c:p:20-34

DOI: 10.1016/j.renene.2020.11.111

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().