Energetic and Exergetic Analyses of an Experimental Earth–Air Heat Exchanger in the Northeast of France

Wael Zeitoun, Jian Lin and Monica Siroux ()
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Wael Zeitoun: ICUBE, IUT Robert Schuman, University of Strasbourg, 67400 Illkirch-Graffenstaden, France
Jian Lin: ICUBE, IUT Robert Schuman, University of Strasbourg, 67400 Illkirch-Graffenstaden, France
Monica Siroux: INSA Strasbourg ICUBE, University of Strasbourg, 67000 Strasbourg, France

Energies, 2023, vol. 16, issue 3, 1-15

Abstract: Earth–air heat exchanger (EAHE) systems are used to pre-heat or pre-cool air before entering into a building using shallow geothermal energy. Assessment of EAHE systems is important to quantify the profitability of these systems. For this purpose, an EAHE system built at ICUBE at the University of Strasbourg in the northeast of France was studied using energy and exergy analyses for a typical heating period (between 25 February and 3 March). Energy analysis was used to determine the heat gained by the air in the system during the studied period and to determine the Coefficient Of Performance ( COP ) of the system. Additionally, exergy analysis, which considered temperature, pressure, humidity, and the variation in the control volume boundary temperature, was realized to determine inefficiencies in the system by determining the exergy destroyed in each component of the system and evaluating its exergetic efficiency. Results showed that the heat energy gained using the system was around 63 kWh and that the exergetic efficiency of the system was about 57% on average. The comparison of exergetic efficiency between the EAHE components showed that the fan has the lowest performance and should be improved to achieve better overall performance.

Keywords: earth–air heat exchanger; horizontal ground heat exchanger; energy analysis; exergy analysis; shallow geothermal energy; renewable energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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