Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Theoretical Analysis of a Rotary Heat Exchanger Based on a Simplified Model

단순모델에 의한 회전형 열교환기 이론해석

  • Son, Sung Gyun (Department of Mechanical Engineering, Graduate School Korea University) ;
  • Kim, Yongchan (Department of Mechanical Engineering, Korea University) ;
  • Lee, Dae-Young (Center for Urban Energy Systems Research, Korea Institute of Science and Technology)
  • 손성균 (고려대학교 기계공학과 대학원) ;
  • 김용찬 (고려대학교 기계공학과) ;
  • 이대영 (한국과학기술연구원 도시에너지시스템연구단)
  • Received : 2014.12.09
  • Accepted : 2015.06.17
  • Published : 2015.08.10
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Abstract

A simplified rotary heat-exchanger model was developed with an assumption of a linear temperature distribution along the flow direction. Based on the model, the exact fluid solution and solid temperature variations were obtained and verified from a comparison with previous numerical studies. The heat transfer in the rotary heat exchanger was investigated using the theoretical solutions. The heat exchanger's effectiveness was shown to be saturated, with a rotational-speed increase that is higher than a critical value that is solely dependent on the thermal capacity of the solid matrix but independent of the fluid flow rate; the saturated value of the effectiveness was determined only by the NTU of the heat exchanger. Where the thermal diffusivity of the solid matrix is so slight that the thermal penetration depth becomes smaller than the matrix thickness, the effective thermal capacity of the solid matrix decreased according to the penetration depth.

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References

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