The energy performance of a shallow ground heat exchanger constituted by a drainage trench is studied. The 12 x 2 x 0.5 m trench is dug in shallow soil and filled with gravel; two vertical tubes at the opposite ends of the trench act as inlet and outlet of the working fluid, which flows 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 in shallow applications.

Ground Heat Transfer from a Drainage Trench

BOTTARELLI, Michele;
2015

Abstract

The energy performance of a shallow ground heat exchanger constituted by a drainage trench is studied. The 12 x 2 x 0.5 m trench is dug in shallow soil and filled with gravel; two vertical tubes at the opposite ends of the trench act as inlet and outlet of the working fluid, which flows 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 in shallow applications.
2015
Bottarelli, Michele; Fujii, Hikari; Di Federico, Vittorio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2334938
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