Evaluation of thermal performance of energy textile installed in Tunnel

Chulho Lee, Sangwoo Park, Jongmuk Won, Jaehyeung Jeoung, Byonghu Sohn, Hangseok Choi

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A new geothermal energy source obtained from a tunnel structure has been studied in this paper. The geothermal energy is extracted through a textile-type ground heat exchanger named "Energy Textile" that is fabricated between a shotcrete layer and guided drainage geotextile. To evaluate the thermal performance of the energy textile, a test bed was constructed in an abandoned railway tunnel located in Seocheon, South Korea. The thermal conductivity of shotcrete and lining samples which were prepared in accordance with a common mixture design was measured in laboratory. An overall performance of the energy textile installed in the test bed was evaluated by carrying out a series of in-situ thermal response tests. In addition, a 3-D finite volume analysis (FLUENT) was adopted to simulate the operation of the ground heat exchanger being encased in the energy textile with the consideration of the shotcrete and lining thermal conductivity, fluid circulation rate, the existence of groundwater and the arrangement of circulation pipes. The results of numerical analyses show that the energy textile exhibits better thermal performance under the following conditions: the thermal conductivity of the tunnel wall is relatively high, and the velocity of the circulated fluid in the energy textile is low. Based on the in-situ thermal response tests, a numerical analysis is performed to simulate the performance of the system under the field condition. In addition, to observe the long-term thermal behavior, the difference in the temperatures of the inlet and outlet fluid of the energy textile is monitored using a constant-temperature water bath and a real simulation system for cooling operating. From the long-term monitoring, results show that the average heat exchange amount of the energy textile (2 unit) was 592-713W, that is 0.08-0.09 RT for 1 unit.

Original languageEnglish
Pages (from-to)11-22
Number of pages12
JournalRenewable Energy
Volume42
DOIs
Publication statusPublished - 2012 Jun 1

Fingerprint

Textiles
Tunnels
Thermal conductivity
Geothermal energy
Linings
Heat exchangers
Fluids
Hot Temperature
Geotextiles
Drainage
Numerical analysis
Groundwater
Pipe
Cooling
Temperature
Monitoring
Water

Keywords

  • Energy textile
  • Geothermal energy
  • Heat exchanger
  • In-situ thermal response test
  • Long-term monitoring
  • Tunnel

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

Cite this

Evaluation of thermal performance of energy textile installed in Tunnel. / Lee, Chulho; Park, Sangwoo; Won, Jongmuk; Jeoung, Jaehyeung; Sohn, Byonghu; Choi, Hangseok.

In: Renewable Energy, Vol. 42, 01.06.2012, p. 11-22.

Research output: Contribution to journalArticle

Lee, Chulho ; Park, Sangwoo ; Won, Jongmuk ; Jeoung, Jaehyeung ; Sohn, Byonghu ; Choi, Hangseok. / Evaluation of thermal performance of energy textile installed in Tunnel. In: Renewable Energy. 2012 ; Vol. 42. pp. 11-22.
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