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In this study, heating performances of horizontal and vertical earth-air heat exchangers with equal pipe lengths were evaluated in ANSYS FLUENT 19.2 simulation program based on CFD for the winter period of Bitlis, Turkey. Thermal per­formance analyses regarding vertical and horizontal 3-D-modeled earth-air heat exchangers were evaluated in steady-state condition of the simulation program for different values of Re = 5⋅103, 104, 2⋅104, 4⋅104, 6⋅104, 8⋅104, and 105 numbers by using standard k-ε turbulence model. Numerical results obtained from CFD based simulation program were compared with a numerical study in the literature, and it was determined that there was a consistency between the results. The pressure loss and fan power values of horizontal and vertical earth-air heat exchangers were also investigated in addition their thermal performances. A good agreement was found between the pressure loss values obtained from the theoretical and simulation calculations of both earth-air heat exchangers. Considering the temperature increases in both earth-air heat exchangers, the highest and lowest temperature increases were observed in vertical earth-air heat exchanger with 22.52 K and 10.67 K, respectively. The best thermal performance was observed in vertical earth-air heat exchanger for 5⋅103, 104, and 2⋅104 values of Reynolds number and in horizontal earth-air heat exchanger for 4⋅104, 6⋅104, 8⋅104, and 105 values of Reynolds number.
PAPER REVISED: 2021-10-17
PAPER ACCEPTED: 2022-04-29
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THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 4, PAGES [2929 - 2939]
  1. Agrawal, K. K., et al., Experimental Study to Investigate the Effect of Water Impregnation on Thermal Performance of Earth Air Tunnel Heat Exchanger for Summer Cooling in Hot and Arid Climate, Renewable Energy, 120 (2018), May, pp. 255-265
  2. Kaushal, M., Performance Analysis of Clean Energy Using Geothermal Earth to Air Heat Exchanger (GEAHE) in Lower Himalayan Region - Case Study Scenario, Energy and Buildings, 248 (2021) Oct., 111166
  3. Cao, S., et al., Feasibility Analysis of Earth-Air Heat Exchanger (EAHE) in A Sports and Culture Center in Tianjin, China, Case Studies in Thermal Engineering, 26 (2021), 101054
  4. Soares, N., et al., Advances in Standalone and Hybrid Earth-Air Heat Exchanger (EAHE) Systems for Buildings: A Review, Energy and Buildings, 253 (2021), 111532
  5. Yang, D., et al., Evaluation of the Thermal Performance of an Earth-to-Air Heat Exchanger (EAHE) in a Harmonic Thermal Environment, Energy Conversion and Management, 109 (2016), Feb., pp. 184-194
  6. Bansal, V., et al., Derating Factor New Concept for Evaluating Thermal Performance of Earth Air Tunnel Heat Exchanger: A Transient CFD Analysis, Applied Energy, 102 (2013), Feb., pp. 418-426
  7. Mathur, A., et al., Comparative Study of Straight and Spiral Earth Air Tunnel Heat Exchanger System Operated in Cooling and Heating Modes, Renewable Energy, 108 (2017), Aug., pp. 474-487
  8. Singh, R., et al., Recent Advancements in Earth Air Tunnel Heat Exchanger (EATHE) System for Indoor Thermal Comfort Application: A Review, Renewable and Sustainable Energy Reviews, 82 (2018), Feb., pp. 2162-2185
  9. Serageldin, A. A., et al., Earth-Air Heat Exchanger Thermal Performance in Egyptian Conditions: Experimental Results, Mathematical Model, and Computational Fluid Dynamics Simulation, Energy Conversion and Management, 122 (2016), Aug., pp. 25-38
  10. Bansal, V., et al., Performance Analysis of Earth-Pipe-Air Heat Exchanger for Winter Heating, Energy and Buildings, 41 (2009), 11, pp. 1151-1154
  11. Wei, H., et al., Field Experiments on the Cooling Capability of Earth-to-Air Heat Exchangers in Hot and Humid Climate, Applied Energy, 276 (2020), 115493
  12. Ozgener, L., Ozgener, O., Energetic Performance Test of an Underground Air Tunnel System for Greenhouse Heating, Energy, 35 (2010), 10, pp. 4079-4085
  13. Esen, H., et al., Energy and Exergy Analysis of a Ground-Coupled Heat Pump System with Two Horizontal Ground Heat Exchangers, Building and Environment, 42 (2007), 10, pp. 3606-3615
  14. Al-Ajmi, F., et al., The Cooling Potential of Earth-Air Heat Exchangers for Domestic Buildings in a Desert Climate, Building and Environment, 41 (2006), 3, pp. 235-244
  15. Ozgener, O., Ozgener, L., Determining the Optimal Design of a Closed Loop Earth to Air Heat Exchanger for Greenhouse Heating by Using Exergoeconomics, Energy and Buildings, 43 (2011), 4, pp. 960-965
  16. Ozgener, L., Ozgener, O., Three Heating Seasons Monitoring of Thermo-Economic Parameters of a Prototype EAHE System for Technological Forecasting and Evaluating Low Grade Geothermal Resources in Turkey, Energy and Buildings, 66 (2013), Nov., pp. 346-352
  17. Ahmed, A., et al., Thermal Performance of Earth-Air Heat Exchanger for Reducing Cooling Energy Demand of Office Buildings in The United Kingdom, Proceedings, 11th Conference of International Building Performance Simulation Association, Glasgow, Scotland, 2009, pp. 2228-2235
  18. Salih, A., Conservation Equations of Fluid Dynamics, Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Thiruvananthapuram, India, 2011
  19. ***, ANSYS Fluent Theory Guide, Release 2020 R1,
  20. ***, Bitlis Meteorology Provincial Directorate, httpss://
  21. ***, Change of Earth Temperature,
  22. Misra, R., et al., Transient Analysis Based Determination of Derating Factor for Earth Air Tunnel Heat Exchanger in Winter, Energy and Buildings, 58 (2013), Mar., pp. 76-85
  23. Ozgener, L., Ozgener, O., An Experimental Study of the Exergetic Performance of an Underground Air Tunnel System for Greenhouse Cooling, Renewable Energy, 35 (2010), 12, pp. 2804-2811
  24. Shahsavar, A., Rajabi, Y., Exergoeconomic and Enviroeconomic Study of an Air Based Building Integrated Photovoltaic/Thermal (BIPV/T) System, Energy, 144 (2018), Feb., pp. 877-886

© 2023 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