Publication detail

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

Shen, Haixiao Cao, Zhen Klemes, Jiri Jaromir Wang, Jin Wang, Enyu

English title

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

Type

journal article in Web of Science

Language

en

Original 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 center dot 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.

English 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 center dot 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.

Keywords in English

Boreholes; Heat storage; Heat transfer; Soil temperature; Soils; Specific heat; Thermal conductivity; Thermal energy

Released

16.12.2023

Publisher

TAYLOR & FRANCIS INC530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106

Location

TAYLOR & FRANCIS INC530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106

ISSN

0145-7632

Volume

21

Number

44

Pages from–to

2027–2039

Pages count

13

BIBTEX


@article{BUT187672,
  author="Jiří {Klemeš} and Jin {Wang},
  title="Numerical Study on Heat Transfer and Performance of Seasonal Borehole Thermal Energy Storage",
  year="2023",
  volume="21",
  number="44",
  month="December",
  pages="2027--2039",
  publisher="TAYLOR & FRANCIS INC530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106",
  address="TAYLOR & FRANCIS INC530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106",
  issn="0145-7632"
}