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Performance Analysis of Fin-tube Evaporator for Carbon Dioxide  

이민규 (고려대학교 기계공학과 대학원)
김영일 (한국과학기술연구원 열유동제어연구센)
장영수 (한국과학기술연구원 열유동제어연구센)
김용찬 (고려대학교 기계공학과)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.16, no.7, 2004 , pp. 645-651 More about this Journal
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.
Keywords
Evaporator; Carbon dioxide; Heat transfer; Fin-tube; Experiment; Simulation;
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