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Evaluation of defrosting methods for air-to-air heat/energy exchangers on energy consumption of ventilation

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  • Rafati Nasr, Mohammad
  • Kassai, Miklos
  • Ge, Gaoming
  • Simonson, Carey J.

Abstract

Energy consumption for ventilation is extensive in cold climates. Air-to-air heat/energy recovery is a well-known and effective method to reduce the energy consumption. However, frosting commonly occurs inside heat/energy exchangers in cold climates, which would significantly degrade the performance of the exchangers. Preheating the outdoor air and bypassing the outdoor airflow are two effective methods for frosting prevention or defrosting. In this study, the performance of two cross-flow heat/energy exchangers at frosting and defrosting periods are experimentally tested under different operating conditions and the values of frosting limit and defrosting time ratio are presented. As well, the effects of these two defrosting methods on energy consumption of ventilation in three cold cities (i.e. Saskatoon, Anchorage and Chicago) are evaluated. The results show the outdoor air preheating method performs better than the outdoor air bypassing method. In addition, the heat/energy recovery potential in Saskatoon undergoes the largest reduction under frosting, and the cold weather conditions have less impact on energy exchangers than heat exchangers for heat/energy recovery.

Suggested Citation

  • Rafati Nasr, Mohammad & Kassai, Miklos & Ge, Gaoming & Simonson, Carey J., 2015. "Evaluation of defrosting methods for air-to-air heat/energy exchangers on energy consumption of ventilation," Applied Energy, Elsevier, vol. 151(C), pages 32-40.
    • Handle: RePEc:eee:appene:v:151:y:2015:i:c:p:32-40
    DOI: 10.1016/j.apenergy.2015.04.022
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    References listed on IDEAS

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    1. Rafati Nasr, Mohammad & Fauchoux, Melanie & Besant, Robert W. & Simonson, Carey J., 2014. "A review of frosting in air-to-air energy exchangers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 538-554.
    2. Gong, Guangcai & Tang, Jinchen & Lv, Dongyan & Wang, Hongjin, 2013. "Research on frost formation in air source heat pump at cold-moist conditions in central-south China," Applied Energy, Elsevier, vol. 102(C), pages 571-581.
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    4. Jang, Ji Young & Bae, Heung Hee & Lee, Seung Jun & Ha, Man Yeong, 2013. "Continuous heating of an air-source heat pump during defrosting and improvement of energy efficiency," Applied Energy, Elsevier, vol. 110(C), pages 9-16.
    5. Wu, Jianghong & Ouyang, Guang & Hou, Puxiu & Xiao, Haobin, 2011. "Experimental investigation of frost formation on a parallel flow evaporator," Applied Energy, Elsevier, vol. 88(5), pages 1549-1556, May.
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    1. Zeng, Cheng & Liu, Shuli & Shukla, Ashish, 2017. "A review on the air-to-air heat and mass exchanger technologies for building applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 75(C), pages 753-774.
    2. Amanowicz, Łukasz, 2018. "Influence of geometrical parameters on the flow characteristics of multi-pipe earth-to-air heat exchangers – experimental and CFD investigations," Applied Energy, Elsevier, vol. 226(C), pages 849-861.
    3. Haihui Tan & Xiaofeng Zhang & Li Zhang & Tangfei Tao & Guanghua Xu, 2019. "Ultrasonic Guided Wave Phased Array Focusing Technology and Its Application to Defrosting Performance Improvement of Air-Source Heat Pumps," Energies, MDPI, vol. 12(16), pages 1-18, August.
    4. Bai, H.Y. & Liu, P. & Justo Alonso, M. & Mathisen, H.M., 2022. "A review of heat recovery technologies and their frost control for residential building ventilation in cold climate regions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 162(C).
    5. Li, Hao & Zhang, Tao & Zhang, Ji & Guan, Bowen & Liu, Xiaohua & Nakazawa, Takema & Fang, Lin & Tanaka, Toshio, 2023. "Investigation of energy recovery performance and frost risk of membrane enthalpy exchanger applied in cold climates," Energy, Elsevier, vol. 282(C).
    6. Aleksejs Prozuments & Jurgis Zemitis & Aleksejs Bulanovs, 2023. "Cold Climate Challenges: Analysis of Heat Recovery Efficiency in Ventilation Systems," Energies, MDPI, vol. 16(22), pages 1-15, November.

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