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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/npg-2017-53
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
18 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Nonlinear Processes in Geophysics (NPG).
Experimental study of forced convection heat transport in porous media
Nicola Pastore1, Claudia Cherubini2, Dimitra Rapti3, and Concetta I. Giasi1 1DICATECh, Department of Civil, Environmental, Building Engineering, and Chemistry, Politecnico di Bari, Bari, Italy
2Department of Physics & Earth Sciences, University of Ferrara, via Saragat 1-44122 Ferrara, Italy
3New Energies And environment Company (NEA) via Saragat, 1-44122 Ferrara, Italy
Abstract. The knowledge of the dynamics of forced convection heat transfer in porous media is relevant in order to optimize the efficiency of geothermal installations in aquifers.

In some applications groundwater is used directly as thermal fluid. The system uses one or several drilling holes to pump and deliver groundwater with a heat exchange system at surface (open loop). Other applications use vertical borehole heat exchangers without injection or extraction of groundwater (closed loop). In both systems the convection flow dynamics in porous media play an important role on the heat production.

The present study is aimed at extending this thematic issue through heat transport experiments and their interpretation at laboratory scale. An experimental study to evaluate the dynamics of forced convection heat transfer in a thermally isolated column filled with porous medium has been carried out. The behavior of two porous media having different grain sizes and specific surfaces has been observed. The experimental data have been compared with an analytical solution for one dimensional heat transport for local non thermal equilibrium condition. The interpretation of the experimental data shows that, the heterogeneity of the porous medium affects heat transport dynamics causing a channeling effect which has consequences on thermal dispersion phenomena and heat transfer between fluid and solid phases limiting the capacity to store or dissipate heat in the porous medium.


Citation: Pastore, N., Cherubini, C., Rapti, D., and Giasi, C. I.: Experimental study of forced convection heat transport in porous media, Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2017-53, in review, 2017.
Nicola Pastore et al.
Nicola Pastore et al.
Nicola Pastore et al.

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Short summary
The use of groundwater as low-enthalpy geothermal resource for heating and cooling of buildings and for agricultural and industrial processes is growing. The study has increased the understanding of heat transfer processes in the subsurface encouraging the investigation on how further parameters affect the amount of energy that can be stored and dissipated. This is important to maximize the efficiency and minimize the environmental impact of the geothermal installations in groundwater.
The use of groundwater as low-enthalpy geothermal resource for heating and cooling of buildings...
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