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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Performance Analysis of Fin-tube Evaporator for Carbon Dioxide

이산화탄소용 핀-관 증발기의 성능해석

  • 이민규 (고려대학교 기계공학과 대학원) ;
  • 김영일 (한국과학기술연구원 열유동제어연구센) ;
  • 장영수 (한국과학기술연구원 열유동제어연구센) ;
  • 김용찬 (고려대학교 기계공학과)
  • Published : 2004.07.01
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Abstract

Fin-tube evaporator for carbon dioxide has been investigated both by experiment and simulation. Inside refrigerant heat transfer and outside heat and mass transfer of a wet surface heat exchanger were modeled using appropriate correlations. The results estimated by the calculation were in good agreement with the experimental results. The simulation errors were less than 7.9% for estimating capacity, 0.6$^{\circ}C$ for air exit temperature, 1.2% for air exit humidity and 17% for $CO_2$ exit pressure. The simulation program was used to study the effect of air flow direction, number of rows and refrigerant circuits. For a 2-row evaporator, parallel flow showed better performance for low air velocity but for high air velocity, counter-flow was better. Refrigerant circuits, however, showed insignificant effect on the performance.

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References

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