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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

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  • Agrawal, Kamal Kumar
  • Misra, Rohit
  • Yadav, Tejpal
  • Agrawal, Ghanshyam Das
  • Jamuwa, Doraj Kamal

Abstract

An EATHE system performs well for short periods but its thermal performance gets deteriorated during long continuous operation due to sub-soil thermal saturation in the vicinity of buried pipe. Effect of soil thermal saturation can be reduced to some extent in longer EATHE pipe but it is uneconomical. In the present study sub-soil moisture content is increased to enhance soil thermal properties and its effect on EATHE thermal performance and pipe length requirement for certain temperature drop has been investigated experimentally for summer cooling in hot and arid climate. In the study, two identical experimental set-ups have been developed at Ajmer city (India). A water impregnation system has been introduced to maintain different soil moisture contents in the close proximity of EATHE pipe. Knee point is obtained at a length of 29 m, 28 m, 27 m and 26 m from pipe inlet section with 5%, 10%, 15% and 20% moisture in sub-soil respectively, as compared to 41 m length in dry soil, after 10 h of continuous operation. The average heat transfer rate and COP increased by 24.1% and 24.0% respectively for 20% moisture content at 30 m EATHE pipe length as compared to dry system.

Suggested Citation

  • 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.
  • Handle: RePEc:eee:renene:v:120:y:2018:i:c:p:255-265
    DOI: 10.1016/j.renene.2017.12.070
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    References listed on IDEAS

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    Cited by:

    1. Arif Widiatmojo & Sasimook Chokchai & Isao Takashima & Yohei Uchida & Kasumi Yasukawa & Srilert Chotpantarat & Punya Charusiri, 2019. "Ground-Source Heat Pumps with Horizontal Heat Exchangers for Space Cooling in the Hot Tropical Climate of Thailand," Energies, MDPI, vol. 12(7), pages 1-22, April.
    2. Agrawal, Kamal Kumar & Misra, Rohit & Agrawal, Ghanshyam Das, 2020. "To study the effect of different parameters on the thermal performance of ground-air heat exchanger system: In situ measurement," Renewable Energy, Elsevier, vol. 146(C), pages 2070-2083.
    3. Akhtari, Mohammad Reza & Shayegh, Iman & Karimi, Nader, 2020. "Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations," Renewable Energy, Elsevier, vol. 148(C), pages 839-851.
    4. Rodrigues, Michel Kepes & Vaz, Joaquim & Oliveira Rocha, Luiz Alberto & Domingues dos Santos, Elizaldo & Isoldi, Liércio André, 2022. "A full approach to Earth-Air Heat Exchanger employing computational modeling, performance analysis and geometric evaluation," Renewable Energy, Elsevier, vol. 191(C), pages 535-556.
    5. Cuny, Mathias & Lin, Jian & Siroux, Monica & Fond, Christophe, 2020. "Influence of rainfall events on the energy performance of an earth-air heat exchanger embedded in a multilayered soil," Renewable Energy, Elsevier, vol. 147(P2), pages 2664-2675.
    6. Agrawal, Kamal Kumar & Misra, Rohit & Agrawal, Ghanshyam Das, 2020. "Improving the thermal performance of ground air heat exchanger system using sand-bentonite (in dry and wet condition) as backfilling material," Renewable Energy, Elsevier, vol. 146(C), pages 2008-2023.
    7. Luka Boban & Dino Miše & Stjepan Herceg & Vladimir Soldo, 2021. "Application and Design Aspects of Ground Heat Exchangers," Energies, MDPI, vol. 14(8), pages 1-31, April.

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