Performance comparison of U-tube and coaxial borehole heat exchangers with numerical simulations

Baracza, Mátyás Krisztián and Pap, József (2024) Performance comparison of U-tube and coaxial borehole heat exchangers with numerical simulations. GRADUS, 11 (1). ISSN 2064-8014

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Abstract

It is well known that geothermal heat is a virtually unlimited energy source beneath the ground, which is formed by the radioactive decay of naturally unstable elements. However geothermal energy has been utilized since the ancient ages, it is still a mission for humanity – even in the times of energy crisis with high prices – to find sustainable solutions for high-efficiency heat energy production. Apart from the conventional hydrothermal wells and production/injection systems, an increasing attention is drawn into deep coaxial heat exchangers and heat pumps, utilized in a single wellbore. Optimization of these systems need to be done with an increased care, however it is possible with results obtained from a set of numerical simulations. The present paper investigates hypothetical, single deep “U”, “double-U” and coaxial arrangements under different flow rates, where the main target was to analyze efficiency of each model, with short time thermal response simulations.

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