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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Performance of a Drainage Trench Employed as Ground Heat Exchanger

Get access (open in a dialog) DOI: 10.1615/IHTC15.pmd.009937
pages 6965-6975

Résumé

Novel shapes of horizontal ground heat exchangers coupled with ground-source heat pumps represent a viable and efficient option for shallow geothermal plants. Here, the thermal performance of a drainage trench employed as a ground heat exchanger is studied. The 12 x 2 x 0.25 m trench is dug in shallow soil and filled with gravel; two tubes at the opposite ends of the trench act as inlet and of the working fluid, flowing into the closed-loop of a system for heating/cooling of a residential building. Groundwater flow and heat transfer in the porous domain surrounding the trench are analysed via a 3D numerical model performing a 3-year simulation. The thermal impact of the exchanger is analysed considering different boundary conditions (1st/2nd kind), given as daily time series at the ground surface. The trench shows a good specific energy production and a significant capacity of smoothing thermal waves, and can be considered a convenient alternative to the flat-panel.