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Design evaluation of Earth-Air Heat Exchangers with multiple ducts

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  • Brum, Ruth S.
  • Ramalho, Jairo V.A.
  • Rodrigues, Michel K.
  • Rocha, Luiz A.O.
  • Isoldi, Liércio A.
  • Dos Santos, Elizaldo D.

Abstract

Earth-Air Heat Exchangers (EAHE) are devices used to improve the thermal conditions inside built environments, which work by pumping the air through buried ducts to use the soil as heat source or sink. They explore the phase difference between the air and the ground temperatures, turning possible to heat the air in the winter or cool it in the summer. By means of Constructal Design strategies, this paper investigates geometrical configurations to assemble the ducts aiming to improve the thermal performance of their installations. This is done here by performing various computational simulations with different layouts to arrange up to five ducts, after imposing restrictions to the air flow and the installation volumes. The results show that significant improvements in EAHE efficiency can be obtained as follows: properly increasing the number of ducts and reducing their diameters, reducing, to some extent, the ratio between their vertical and horizontal spacing, and increasing the ratio between the installation volume and the computational domain. Therefore, the simple addition of ducts in EAHE installations does not mean a superior performance when no attention is paid towards how to arrange them.

Suggested Citation

  • Brum, Ruth S. & Ramalho, Jairo V.A. & Rodrigues, Michel K. & Rocha, Luiz A.O. & Isoldi, Liércio A. & Dos Santos, Elizaldo D., 2019. "Design evaluation of Earth-Air Heat Exchangers with multiple ducts," Renewable Energy, Elsevier, vol. 135(C), pages 1371-1385.
    • Handle: RePEc:eee:renene:v:135:y:2019:i:c:p:1371-1385
    DOI: 10.1016/j.renene.2018.09.063
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    1. Kepes Rodrigues, Michel & da Silva Brum, Ruth & Vaz, Joaquim & Oliveira Rocha, Luiz Alberto & Domingues dos Santos, Elizaldo & Isoldi, Liércio André, 2015. "Numerical investigation about the improvement of the thermal potential of an Earth-Air Heat Exchanger (EAHE) employing the Constructal Design method," Renewable Energy, Elsevier, vol. 80(C), pages 538-551.
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    4. Vieira, R.S. & Petry, A.P. & Rocha, L.A.O. & Isoldi, L.A. & dos Santos, E.D., 2017. "Numerical evaluation of a solar chimney geometry for different ground temperatures by means of constructal design," Renewable Energy, Elsevier, vol. 109(C), pages 222-234.
    5. Martins, J.C. & Goulart, M.M. & Gomes, M. das N. & Souza, J.A. & Rocha, L.A.O. & Isoldi, L.A. & dos Santos, E.D., 2018. "Geometric evaluation of the main operational principle of an overtopping wave energy converter by means of Constructal Design," Renewable Energy, Elsevier, vol. 118(C), pages 727-741.
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    4. 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.
    5. Long, Tianhe & Zhao, Ningjing & Li, Wuyan & Wei, Shen & Li, Yongcai & Lu, Jun & Huang, Sheng & Qiao, Zhenyong, 2022. "Natural ventilation performance of solar chimney with and without earth-air heat exchanger during transition seasons," Energy, Elsevier, vol. 250(C).
    6. 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.
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    8. 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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