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Numerical investigation of the performance and soil temperature recovery of an EATHE system under intermittent operations

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  • Mathur, Anuj
  • Surana, Ankit Kumar
  • Mathur, Sanjay

Abstract

One of the problems in operating earth air tunnel heat exchangers (EATHE) for cooling in summer, with soil having high specific heat and low moisture content is accumulation of heat around the pipe. The low rate of heat dissipation due to conduction restricts the performance of EATHE over subsequent years. In the present paper, numerical simulations have been performed to investigate the thermal performance and soil temperature during summer operation in Jaipur to estimate extent of soil degradation. The simulation result indicates that by the end of summer, the soil leads to thermal saturation which in turn, may render it unusable for next summer. This scenario demands for heat removal through force convection. Three strategies namely, night purging during summer operation, day operation during winter and night operation during winter were attempted to estimate extent of soil recovery. Simulation results show that the average COPs for summer, summer with night purging, winter day and winter night operation mode are 4.23, 3.68, 5.01, and 6.65 respectively. It was found that advantage of night purging is less than energy required to run blower for night purging. However, winter day/night operation offers space heating and better soil for next summer.

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  • Mathur, Anuj & Surana, Ankit Kumar & Mathur, Sanjay, 2016. "Numerical investigation of the performance and soil temperature recovery of an EATHE system under intermittent operations," Renewable Energy, Elsevier, vol. 95(C), pages 510-521.
    • Handle: RePEc:eee:renene:v:95:y:2016:i:c:p:510-521
    DOI: 10.1016/j.renene.2016.04.037
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    References listed on IDEAS

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    6. Singh, Ramkishore & Sawhney, R.L. & Lazarus, I.J. & Kishore, V.V.N., 2018. "Recent advancements in earth air tunnel heat exchanger (EATHE) system for indoor thermal comfort application: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 2162-2185.
    7. Hasan, Mushtaq I. & Jabbar, Eman Kareem, 2021. "Fabricating and testing of the ground coupled air conditioner for residential applications in Iraqi weather," Energy, Elsevier, vol. 216(C).
    8. 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.
    9. 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.
    10. Mihalakakou, Giouli & Souliotis, Manolis & Papadaki, Maria & Halkos, George & Paravantis, John & Makridis, Sofoklis & Papaefthimiou, Spiros, 2022. "Applications of earth-to-air heat exchangers: A holistic review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 155(C).
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