Study on performance of energy textile installed in tunnel by CFD analysis and field tests

摘要

Textile-type ground-coupled heat exchangers, so called “energy textile”, were installed in anrnabandoned railroad tunnel, South Korea. In order to monitor the thermal behavior of the energy textile, arnconstant-temperature water bath (CWB) was adopted as a heat source for both cooling and heating operation.rnIn the course of the experimental measurement, the inlet and outlet fluid temperatures of the energy textile,rnpumping rate, temperature distribution in the ground, and air temperature inside the tunnel were continuouslyrnrecorded.Then CFD (Computational Fluid Dynamics) numerical analysiswas performed to simulate results fromrnfield measurements for the selected energy textiles with consideration of air temperature inside the tunnel. Thernconvection coefficient method was applied in a developed numerical model with UDF (User Define Function)rnto consider effect of the air temperature inside the tunnel. Finally, the thermal performance of the energy textilernis discussed with various types of ground-coupled heat exchangers.