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‘Derating Factor’ new concept for evaluating thermal performance of earth air tunnel heat exchanger: A transient CFD analysis

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  • Bansal, Vikas
  • Misra, Rohit
  • Agarwal, Ghanshyam Das
  • Mathur, Jyotirmay

Abstract

A new term ‘Derating Factor’ is devised for evaluating deterioration in thermal performance of Earth Air Tunnel Heat Exchanger (EATHE) under transient operating conditions in predominantly hot and dry climate of Ajmer (India) using experimental and computational fluid dynamics modeling with FLUENT software. Maximum air temperature drop obtained using steady state approach for EATHE of pipe length 100m, pipe diameter 0.2m and at air velocity of 5ms−1 is 18.4°C, 18.7°C and 18.4°C for soil thermal conductivity of 0.52, 2.0 and 4.0Wm−1K−1 respectively. However, the maximum air temperature drop obtained using transient approach during 24h of operation vary between 18.3°C and 14.0°C, 18.3°C and 17.2°C and 18.6°C and 18.0°C for soil thermal conductivity of 0.52, 2.0 and 4.0Wm−1K−1 respectively. The derating factor is found to be a function of thermal conductivity of soil, duration of continuous operation of EATHE and length of pipe. The analyzed cases have shown the range of derating to be as minimal as 0.2% to as high as 68%, which if ignored while designing may lead to poor performance of earth air heat exchangers. Maximum value of derating factor is observed after continuous operation of EATHE for 24h.

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  • Bansal, Vikas & Misra, Rohit & Agarwal, Ghanshyam Das & Mathur, Jyotirmay, 2013. "‘Derating Factor’ new concept for evaluating thermal performance of earth air tunnel heat exchanger: A transient CFD analysis," Applied Energy, Elsevier, vol. 102(C), pages 418-426.
    • Handle: RePEc:eee:appene:v:102:y:2013:i:c:p:418-426
    DOI: 10.1016/j.apenergy.2012.07.027
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    9. Andrew Zajch & William A. Gough & Giacomo Chiesa, 2020. "Earth–Air Heat Exchanger Geo-Climatic Suitability for Projected Climate Change Scenarios in the Americas," Sustainability, MDPI, vol. 12(24), pages 1-28, December.
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    12. Hollmuller, Pierre & Lachal, Bernard, 2014. "Air–soil heat exchangers for heating and cooling of buildings: Design guidelines, potentials and constraints, system integration and global energy balance," Applied Energy, Elsevier, vol. 119(C), pages 476-487.
    13. H.Ali, Mohammed & Kurjak, Zoltan & Beke, Janos, 2023. "Investigation of earth air heat exchangers functioning in arid locations using Matlab/Simulink," Renewable Energy, Elsevier, vol. 209(C), pages 632-643.
    14. Paolo Maria Congedo & Caterina Lorusso & Maria Grazia De Giorgi & Riccardo Marti & Delia D’Agostino, 2016. "Horizontal Air-Ground Heat Exchanger Performance and Humidity Simulation by Computational Fluid Dynamic Analysis," Energies, MDPI, vol. 9(11), pages 1-14, November.
    15. Agrawal, Kamal Kumar & Misra, Rohit & Yadav, Tejpal & Agrawal, Ghanshyam Das & Jamuwa, Doraj Kamal, 2018. "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, Elsevier, vol. 120(C), pages 255-265.
    16. Qinggong Liu & Zhenyu Du & Yi Fan, 2018. "Heat and Mass Transfer Behavior Prediction and Thermal Performance Analysis of Earth-to-Air Heat Exchanger by Finite Volume Method," Energies, MDPI, vol. 11(6), pages 1-19, June.
    17. Soni, Suresh Kumar & Pandey, Mukesh & Bartaria, Vishvendra Nath, 2015. "Ground coupled heat exchangers: A review and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 47(C), pages 83-92.
    18. Amanowicz, Łukasz & Wojtkowiak, Janusz, 2020. "Approximated flow characteristics of multi-pipe earth-to-air heat exchangers for thermal analysis under variable airflow conditions," Renewable Energy, Elsevier, vol. 158(C), pages 585-597.
    19. Zukowski, Mroslaw & Topolanska, Justyna, 2018. "Comparison of thermal performance between tube and plate ground-air heat exchangers," Renewable Energy, Elsevier, vol. 115(C), pages 697-710.
    20. Lee, Seokjae & Park, Sangwoo & Won, Jongmuk & Choi, Hangseok, 2021. "Influential factors on thermal performance of energy slabs equipped with an insulation layer," Renewable Energy, Elsevier, vol. 174(C), pages 823-834.
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    22. Taurines, Kevin & Giroux-Julien, Stéphanie & Farid, Mohammed & Ménézo, Christophe, 2021. "Numerical modelling of a building integrated earth-to-air heat exchanger," Applied Energy, Elsevier, vol. 296(C).

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