Experimental study of nanofluid heat transfer for geothermal applications

M.I. Pisarevsky, P.G. Struchalin, B.V. Balakin, K.V. Kutsenko and Y.A. Maslov

Renewable Energy, 2024, vol. 221, issue C

Abstract: The paper presents a performance study of a lab-scale geothermal coaxial heat exchanger with an aqueous nanofluid with the nanoparticles of Al2O3. The concentration of nanoparticles was in the interval 2% wt. to 8% wt. We describe the nanofluid production method resulting in samples that are stable in static conditions for 50 days. The average size of the particles was 183 nm in−situ. We found that the thermal conductivity of the nanofluid may increase up to 13%, and the maximum apparent viscosity grows to 20% relative to the base fluid. The nanofluid was tested in a lab-scale geothermal heat exchanger. The best thermal performance of the heat exchanger with nanofluid was 9% higher than for the experiments with the base fluid.

Keywords: Geothermal energy; Borehole heat exchanger; Nanofluid; Aluminum oxide; Nanofluid stability (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:221:y:2024:i:c:s096014812301546x

DOI: 10.1016/j.renene.2023.119631

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