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Feasibility study on applications of an Earth-air Heat Exchanger (EAHE) for preheating fresh air in severe cold regions

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  • Li, Hui
  • Ni, Long
  • Liu, Guang
  • Zhao, Zisang
  • Yao, Yang

Abstract

Due to high power consumption and air pollution situation in China, insufficient indoor fresh air during heating season can be a noteworthy problem. Unlike previous researches, which mainly focused on cooling capacity of Earth-air Heat Exchanger (EAHE), feasibility of EAHE combined with Heat Recovery Unit (HRU) as an independent heat source to heat cold air in severe cold regions was firstly verified. U-shaped buried pipes were proposed to enhance heat transfer as well as save land-use. Thorough measurements of air and soil parameters and power consumption were conducted under several operation modes, performance indexes like heating capacity, heat transfer efficiency and COP were analyzed. Results showed average temperature rise of 14.0 °C provided by EAHE and further 12.1 °C promotion brought by HRU helped outdoor air reach to an acceptable level without auxiliary heating equipment. Heating capacity of EAHE increased with decreasing inlet temperature, when inlet temperature changed from −0.4 to −24.4 °C, heating capacity increased from 709 W (19.7 W/m) to 7718 W (214.4 W/m). Performance of HRU rarely reacted to climatic conditions because of the stable outlet temperature of EAHE. Maximum comprehensive COP was 16.3, which indicated the high efficiency of system. Results showed EAHE can be expanded to severe cold regions and achieve good efficiency.

Suggested Citation

  • Li, Hui & Ni, Long & Liu, Guang & Zhao, Zisang & Yao, Yang, 2019. "Feasibility study on applications of an Earth-air Heat Exchanger (EAHE) for preheating fresh air in severe cold regions," Renewable Energy, Elsevier, vol. 133(C), pages 1268-1284.
    • Handle: RePEc:eee:renene:v:133:y:2019:i:c:p:1268-1284
    DOI: 10.1016/j.renene.2018.09.012
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    References listed on IDEAS

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    4. Molina-Rodea, R. & Saucedo-Velázquez, J. & Gómez-Franco, W.R. & Wong-Loya, J.A., 2024. "Operational proposal of “U” type earth heat exchanger harnessing a non-producing well for energy supply to an absorption cooling system. Approach with “La Primavera” geothermal field data," Renewable Energy, Elsevier, vol. 227(C).
    5. Wei, Haibin & Yang, Dong & Du, Jinhui & Guo, Xin, 2021. "Field experiments on the effects of an earth-to-air heat exchanger on the indoor thermal environment in summer and winter for a typical hot-summer and cold-winter region," Renewable Energy, Elsevier, vol. 167(C), pages 530-541.
    6. Li, Yongcai & Long, Tianhe & Bai, Xi & Wang, Linfeng & Li, Wuyan & Liu, Shuli & Lu, Jun & Cheng, Yong & Ye, Kai & Huang, Sheng, 2021. "An experimental investigation on the passive ventilation and cooling performance of an integrated solar chimney and earth–air heat exchanger," Renewable Energy, Elsevier, vol. 175(C), pages 486-500.
    7. Ascione, Fabrizio & Borrelli, Martina & De Masi, Rosa Francesca & Vanoli, Giuseppe Peter, 2020. "Hourly operational assessment of HVAC systems in Mediterranean Nearly Zero-Energy Buildings: Experimental evaluation of the potential of ground cooling of ventilation air," Renewable Energy, Elsevier, vol. 155(C), pages 950-968.
    8. Bai, Yufu & Long, Tianhe & Li, Wuyan & Li, Yongcai & Liu, Shuli & Wang, Zhihao & Lu, Jun & Huang, Sheng, 2022. "Experimental investigation of natural ventilation characteristics of a solar chimney coupled with earth-air heat exchanger (SCEAHE) system in summer and winter," Renewable Energy, Elsevier, vol. 193(C), pages 1001-1018.
    9. 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).
    10. Chong Zhang & Jinbo Wang & Liao Li & Feifei Wang & Wenjie Gang, 2020. "Utilization of Earth-to-Air Heat Exchanger to Pre-Cool/Heat Ventilation Air and Its Annual Energy Performance Evaluation: A Case Study," Sustainability, MDPI, vol. 12(20), pages 1-17, October.
    11. Lekhal, Mohammed Cherif & Benzaama, Mohammed-Hichem & Kindinis, Andrea & Mokhtari, Abderahmane-Mejedoub & Belarbi, Rafik, 2021. "Effect of geo-climatic conditions and pipe material on heating performance of earth-air heat exchangers," Renewable Energy, Elsevier, vol. 163(C), pages 22-40.
    12. Kwang-Seob Lee & Eun-Chul Kang & Yu-Jin Kim & Euy-Joon Lee, 2019. "Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application," Energies, MDPI, vol. 12(21), pages 1-13, October.

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