THERMAL SCIENCE

International Scientific Journal

Merdassi Mustapha

,

Aouissi Mokhtar

NUMERICAL MODELING OF AN EARTH AIR HEAT EXCHANGER UNDER THE LOCAL CONDITIONS OF LAGHOUAT CITY, ALGERIA

ABSTRACT
In this work, a numerical simulation of the air-flow through an earth-air heat exchanger was carried out using the CFD platform ANSYS FLUENT 2020 R2 to examine the reliability of the 3-D numerical model. The results were compared with experimental data from the literature for two flow regimes: steady and transient. The main objective of this numerical study was to evaluate the performance of the earth-air heat exchanger under local seasonal climatic conditions (summer and winter seasons in Laghouat City, Algeria). For this purpose, a parametric analysis was performed to study the effects of inlet air velocity and pipe diameter for both winter and summer seasons on the air temperature at the exchanger outlet. Promising outcomes were demonstrated, with system efficiency reaching 85% in the summer for an inlet air temperature of 43°C and 84% in the winter for an inlet air temperature of –2°C. These results were obtained at an optimal inlet air velocity of 2.5 m/s and a pipe diameter of 0.11 m. It was also found that the earth-air heat exchanger could operate continuously.
KEYWORDS
earth air heat exchanger, computational fluid dynamics, numerical, simulation, summer, winter, temperature
PAPER SUBMITTED: 2025-01-06
PAPER REVISED: 2025-02-02
PAPER ACCEPTED: 2025-02-17
PUBLISHED ONLINE: 2025-07-05
DOI REFERENCE: https://doi.org/10.2298/TSCI250106099M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2026, VOLUME 30, ISSUE No. 1, PAGES [497 - 508]
REFERENCES
[1] ***, Ministère de l'Énergie et des Mines, Bilan Énergétique National 2021 (in French), (Ministry of Mines and Energy, National Energy Balance) Algeria, 2021
[2] Ahmad, S., Prakash, O., Three-Dimensional Simulation of Earth Air Heat Exchanger for Cooling Application and Its Validation Using an Experimental Test Rig, Heat and Mass Transfer, 59 (2023), Dec., pp. 1277-1292
[3] Carlos, H. D., et al., Numerical and Experimental Analysis of an Earth-Air Heat Exchanger, Atmosphere, 14 (2023), 7, pp. 1113-1128
[4] Tasdelen, F., Dagtekin, I., A Numerical Study on the Heating Performance of Horizontal and Vertical Earth-Air Heat Exchangers with Equal Pipe Lengths, Thermal Science, 26 (2022), 4A, pp. 2929-2939
[5] Lukasz, A., et al., Validation of CFD Model for Simulation of Multi-Pipe Earth-to-Air Heat Exchangers (EAHEs) Flow Performance, Thermal Science and Engineering, 5 (2018), Mar., pp. 44-49
[6] Mushtaq, I., et al., Evaluating the Influence of Some Design and Environmental Parameters on the Performance of Earth-to-Air Heat Exchangers, Journal of Engineering and Sustainable Development, 22 (2018), 02, pp. 10-29
[7] El Ghazali, M., et al., An Experimental and Numerical Study of Horizontal Earth-Air Heat Exchanger in a Hot Climate, International Journal of Sustainable Engineering, 10 (2017), 2, pp. 82-89
[8] Benrachi, N., et al., Numerical Parametric Study of a New Earth-Air Heat Exchanger Configuration Designed for Hot and Arid Climates, International Journal of Green Energy, 17 (2020), 2, pp. 115-126
[9] Belloufi, Y., et al., Etude theorique et experimentale du rafraichissement de l'air par un echangeur geothermique air/sol (Theoretical and Experimental Study of Air Refresh by a Geothermal Heat Exchanger Air/Ground - in French). LARHYSS Journal, 13 (2016), 1, pp. 121-137
[10] Belloufi, Y., et al., Numerical and Experimental Investigation on the Transient Behavior of an Earth Air Heat Exchanger in Continuous Operation Mode, International Journal of Heat and Technology, 35 (2017), 2, pp. 279-288
[11] Damodharan, A., et al., Experimental and Numerical Analysis of Soil-to-Air Heat Exchanger System for Domestic Buildings, Thermal Science, 24 (2020), 1B, pp. 603-608
[12] Molina-Rodea, R., et al., Experimental Evaluation of a "U" Type Earth-to-Air Heat Exchanger Planned for Narrow Installation Space in Warm Climatic Conditions, Energy and Built Environment, 5 (2024), 5, pp. 772-786
[13] Zeitoun, W., et al., Energetic and Exergetic Analyses of an Experimental Earth-Air Heat Exchanger in the Northeast of France, Energies, 16 (2023),3, pp. 1542-1557
[14] Gooroochurn, M., et al., Investigation of the Performance of Ground-Coupled Heat Exchanger Technology for Tempering Air, Journal of Energy Systems, 6 (2022), 2, pp. 309-332
[15] Kaddour, A., et al., A Numerical Evaluation on the Utilization of Earth-to-Air Heat Exchangers in Arid Regions Algeria, Journal of Thermal Engineering, 8 (2022), 4, pp. 505-514
[16] Penaloza Pena, S. A., Jaramillo, I., Potential Applicability of Earth to Air Heat Exchanger for Cooling in a Colombian Tropical Weather. Buildings, 11 (2021), 6, pp. 219-237
[17] Bughio, M., et al., Parametric Performance Analysis of the Cooling Potential of Earth-to-Air Heat Exchangers in Hot and Humid Climates, Energies, 15 (2022), 19, 7054
[18] Kusuda, T., Achenbach, P. R., Earth Temperature and Thermal Diffusivity at Selected Stations in the United States, Report No. 8972, National Bureau of Standards, Washington, D.C., USA, 1965
[19] Comolet, R., Experimental Mechanics of Fluids, Vol. 2, Dynamics of Real Fluids (2nd ed.), Masson, Paris, France, 1976
[20] ***, Historic Weather, https://www.historique meteo. net/ afrique / algerie / laghouat/2020
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Numerical modeling of an earth air heat exchanger under the local conditions of Laghouat City, Algeria

© 2026 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence