Journal of Shandong University(Engineering Science) ›› 2025, Vol. 55 ›› Issue (4): 149-159.doi: 10.6040/j.issn.1672-3961.0.2024.068

• Energy and Power Engineering • Previous Articles    

Model establishment and energy-saving analysis of liquid circulation heat recovery systems

LU Jiatong, ZHANG Chaoxu, DONG Xiaofei, ZHAO Hongxia*, BAI Chao   

  1. LU Jiatong, ZHANG Chaoxu, DONG Xiaofei, ZHAO Hongxia*, BAI Chao(School of Nuclear Science, Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Published:2025-08-31

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Abstract: To reduce the fresh air load, mathematical models of two liquid recirculating heat recovery systems were constructed based on flat finned circular tube heat exchangers. The model was divided into multiple treatment areas according to temperature and humidity based on outdoor meteorological parameters for 8 760 h in a year. The energy-saving effect of each system was calculated hour by hour. The results showed that under low humidity conditions, the performance of the three-coil and two-coil heat recovery systems was similar; under high humidity conditions, the three-coil system had a significant advantage, and its recovered energy was about 3.86 times of a two-coil system. Compared with the no heat recovery system, the annual energy-saving rate of the two-coil system was about 25.78%, while the three-coil system was as high as about 42.02%. The three-coil heat recovery system not only pre-cooled or pre-heated the outdoor air, but also met the reheating demand after dehumidification in summer, so the heat recovery effect was more stable throughout the year and the energy-saving performance was excellent. This study provided a theoretical basis for the modification of the heat recovery system of the air handling unit, which was of great significance for green building and sustainable development.

Key words: liquid circulation heat recovery, finned tube heat exchangers, outdoor meteorological parameter, energy-saving, air handling unit

CLC Number: 

  • TU83
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