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Improving the thermal performance of ground air heat exchanger system using sand-bentonite (in dry and wet condition) as backfilling material

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  • Agrawal, Kamal Kumar
  • Misra, Rohit
  • Agrawal, Ghanshyam Das

Abstract

Thermal performance of ground-air heat exchanger (GAHE) depends on the rate of heat transfer between air and soil, which is governed by thermal properties of soil surrounding the GAHE pipe. Soil thermal properties around GAHE pipe can be improved either by increasing its moisture contents or by using some thermally enhanced backfilling materials. In the present study experimentally investigates the thermal performance of ground-air heat exchanger system using a sand-bentonite mixture (dry as well as wet) and compare their performance with the ground air heat exchanger system having native soil (dry as well as wet) as backfilling material. The study acknowledges the highest cooling capacity (125 W) for GAHE with wet sand-bentonite as backfilling material, and after 6 h of continuous operation, it is 38.4%, 18.4% and 11.1% higher than that obtained with dry native soil, dry sand-bentonite and wet native soil, respectively. The study also revealed that thermal performance deterioration factor (TPDF) increases with the duration of the operation. At airflow velocity of 5 m/s, after 6 h of continuous operation highest TPDF is noticed for ground-air heat exchanger with dry soil (0.22); whereas, lowest TPDF is observed for ground-air heat exchanger system with wet sand-bentonite (0.07).

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:146:y:2020:i:c:p:2008-2023
    DOI: 10.1016/j.renene.2019.08.044
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    References listed on IDEAS

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    1. Gao, Xiangkui & Xiao, Yimin & Gao, Penghui, 2022. "Thermal potential improvement of an earth-air heat exchanger (EAHE) by employing backfilling for deep underground emergency ventilation," Energy, Elsevier, vol. 250(C).
    2. Łukasz Amanowicz & Janusz Wojtkowiak, 2021. "Comparison of Single- and Multipipe Earth-to-Air Heat Exchangers in Terms of Energy Gains and Electricity Consumption: A Case Study for the Temperate Climate of Central Europe," Energies, MDPI, vol. 14(24), pages 1-28, December.
    3. 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.

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