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Numerical Study on Heat Transfer and Performance of Seasonal Borehole Thermal Energy Storage

Shen, Haixiao ; Cao, Zhen LU ; Klemeš, Jiří Jaromír ; Wang, Jin LU and Wang, Enyu (2023) In Heat Transfer Engineering 44(21-22). p.2027-2039
Abstract

Design of the borehole thermal energy storage (BTES) is very important for the seasonal solar thermal storage system. The BTES designed based on the empirical method could lead to some unsatisfied effects in actual operations. This paper simulated the BTES operation in one year to study the effects of soil thermal conductivity, soil volume-specific heat, initial soil temperature and relative surface area of storage on energy efficiency of the BTES. The results show that energy efficiency of the BTES reaches the maximum when soil thermal conductivity is 1.8 W/(m·K). According to the results, soil thermal conductivity has more significant effects on the heat extraction per soil volume but has the most negligible impact on energy... (More)

Design of the borehole thermal energy storage (BTES) is very important for the seasonal solar thermal storage system. The BTES designed based on the empirical method could lead to some unsatisfied effects in actual operations. This paper simulated the BTES operation in one year to study the effects of soil thermal conductivity, soil volume-specific heat, initial soil temperature and relative surface area of storage on energy efficiency of the BTES. The results show that energy efficiency of the BTES reaches the maximum when soil thermal conductivity is 1.8 W/(m·K). According to the results, soil thermal conductivity has more significant effects on the heat extraction per soil volume but has the most negligible impact on energy efficiency of the BTES. At the same time, relative surface area of storage is the most influential factor on energy efficiency of the BTES. Finally, a new BTES design method was proposed which is suitable for the studied parameter range. It is worth noting that the present study focuses on the continuous operation of the system and fixed buried pipe spacing, while the intermittent operation and other buried pipe spacing will be studied in future work.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Heat Transfer Engineering
volume
44
issue
21-22
pages
2027 - 2039
publisher
Taylor & Francis
external identifiers
  • scopus:85146247466
ISSN
0145-7632
DOI
10.1080/01457632.2022.2164687
language
English
LU publication?
yes
id
fe0b1381-9810-4e56-a961-d29707a9393c
date added to LUP
2023-02-17 11:25:43
date last changed
2024-01-09 15:47:40
@article{fe0b1381-9810-4e56-a961-d29707a9393c,
  abstract     = {{<p>Design of the borehole thermal energy storage (BTES) is very important for the seasonal solar thermal storage system. The BTES designed based on the empirical method could lead to some unsatisfied effects in actual operations. This paper simulated the BTES operation in one year to study the effects of soil thermal conductivity, soil volume-specific heat, initial soil temperature and relative surface area of storage on energy efficiency of the BTES. The results show that energy efficiency of the BTES reaches the maximum when soil thermal conductivity is 1.8 W/(m·K). According to the results, soil thermal conductivity has more significant effects on the heat extraction per soil volume but has the most negligible impact on energy efficiency of the BTES. At the same time, relative surface area of storage is the most influential factor on energy efficiency of the BTES. Finally, a new BTES design method was proposed which is suitable for the studied parameter range. It is worth noting that the present study focuses on the continuous operation of the system and fixed buried pipe spacing, while the intermittent operation and other buried pipe spacing will be studied in future work.</p>}},
  author       = {{Shen, Haixiao and Cao, Zhen and Klemeš, Jiří Jaromír and Wang, Jin and Wang, Enyu}},
  issn         = {{0145-7632}},
  language     = {{eng}},
  number       = {{21-22}},
  pages        = {{2027--2039}},
  publisher    = {{Taylor & Francis}},
  series       = {{Heat Transfer Engineering}},
  title        = {{Numerical Study on Heat Transfer and Performance of Seasonal Borehole Thermal Energy Storage}},
  url          = {{http://dx.doi.org/10.1080/01457632.2022.2164687}},
  doi          = {{10.1080/01457632.2022.2164687}},
  volume       = {{44}},
  year         = {{2023}},
}