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

2 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 1

Fingerprint

Heat exchangers
Pipe
Heat transfer
Polyethylene
High density polyethylenes
Temperature distribution
Thermodynamic properties
Pumps
Soils
Finite element method
Hot Temperature

Keywords

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

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)

Cite this

Numerical characterization of heat transfer in closed-loop vertical ground heat exchanger. / Lee, Chulho; Gil, Hujeong; Choi, Hangseok; Kang, Shin Hyung.

In: Science China Technological Sciences, Vol. 53, No. 1, 01.01.2010, p. 111-116.

Research output: Contribution to journalArticle

@article{9b388cfc0dea427dbe49de15b4d539d5,
title = "Numerical characterization of heat transfer in closed-loop vertical ground heat exchanger",
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.",
keywords = "Ground heat exchanger, HDPE pipe, Latticed pipe, Sectional efficiency",
author = "Chulho Lee and Hujeong Gil and Hangseok Choi and Kang, {Shin Hyung}",
year = "2010",
month = "1",
day = "1",
doi = "10.1007/s11431-009-0414-8",
language = "English",
volume = "53",
pages = "111--116",
journal = "Science in China, Series E: Technological Sciences",
issn = "1006-9321",
publisher = "Science in China Press",
number = "1",

}

TY - JOUR

T1 - Numerical characterization of heat transfer in closed-loop vertical ground heat exchanger

AU - Lee, Chulho

AU - Gil, Hujeong

AU - Choi, Hangseok

AU - Kang, Shin Hyung

PY - 2010/1/1

Y1 - 2010/1/1

N2 - 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.

AB - 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.

KW - Ground heat exchanger

KW - HDPE pipe

KW - Latticed pipe

KW - Sectional efficiency

UR - http://www.scopus.com/inward/record.url?scp=77950786655&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77950786655&partnerID=8YFLogxK

U2 - 10.1007/s11431-009-0414-8

DO - 10.1007/s11431-009-0414-8

M3 - Article

VL - 53

SP - 111

EP - 116

JO - Science in China, Series E: Technological Sciences

JF - Science in China, Series E: Technological Sciences

SN - 1006-9321

IS - 1

ER -