Numerical characterization of heat transfer in closed-loop vertical ground heat exchanger

Chulho Lee, Hujeong Gil, Hangseok Choi, Shin Hyung Kang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A series of numerical analyses has been performed on the characteristics of heat transfer in a closed-loop vertical ground heat exchanger (U-loop). A 2-D finite element analysis was conducted to evaluate the temperature distribution over the cross section of the U-loop system involving high-density polyethylene (HDPE) pipe/grout/soil to compare the sectional efficiency between the conventional U-loop and a new latticed HDPE pipe system, which is equipped with a thermally insulating lattice in order to reduce thermal interference between the inlet and outlet pipes. In addition, a 3-D finite volume analysis (FLUENT) was adopted to simulate the operation of the closed-loop vertical ground heat exchanger with the consideration of the effect of a distance between the inlet and outlet pipes, grout's thermal properties, the effectiveness of the latticed HDPE pipe system, and the rate of circulation pump. It was observed that the thermal interference between the two strands of U-loop is of importance in enhancing efficiency of the ground heat exchanger. Consequently, it is recommended to modify the configuration of the conventional U-loop system by equipping the thermally insulating lattice between the two pipe strands.

Original languageEnglish
Pages (from-to)111-116
Number of pages6
JournalScience China Technological Sciences
Volume53
Issue number1
DOIs
Publication statusPublished - 2010 Jan

Keywords

  • Ground heat exchanger
  • HDPE pipe
  • Latticed pipe
  • Sectional efficiency

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Fingerprint Dive into the research topics of 'Numerical characterization of heat transfer in closed-loop vertical ground heat exchanger'. Together they form a unique fingerprint.

  • Cite this