Heat transfer analysis of ground heat exchangers with inclined boreholes

Ping Cui, Hongxing Yang, Zhaohong Fang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

95 Citations (Scopus)


Consisting of closed-loop of pipes buried in boreholes, ground heat exchangers (GHEs) are devised for extraction or injection of thermal energy from/into the ground. Evolved from the vertical borehole systems, the configuration of inclined boreholes is considered in order to reduce the land plots required to install the GHEs in densely populated areas. A transient three-dimensional heat conduction model has been established and solved analytically to describe the temperature response in the ground caused by a single inclined line source. Heat transfer in the GHEs with multiple boreholes is then studied by superimposition of the temperature excesses resulted from individual boreholes. On this basis, two kinds of representative temperature responses on the borehole wall are defined and discussed. The thermal interference between inclined boreholes is compared with that between vertical ones. The analyses can provide a basic and useful tool for the design and thermal simulation of the GHEs with inclined boreholes.
Original languageEnglish
Pages (from-to)1169-1175
Number of pages7
JournalApplied Thermal Engineering
Issue number11-12
Publication statusPublished - 1 Aug 2006


  • Ground heat exchanger
  • Ground-coupled heat pump
  • Heat conduction
  • Inclined borehole

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Mechanical Engineering

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