복합 전열 촉진 핀이 적용된 핀-관 열교환기의 성능에 대한 실험적 연구

Abstract

Abstract In this study, heat transfer and friction characteristics of compound enhanced fin-and-tube heat exchangerswere experimentally investigated. Louver-finned heat exchangers were also tested for comparison purpose. The effectof fin pitch on j and f factor was negligible. The j factor decreased as number of tube row increased. However, ffactor was independent of number of tube row. Louver fin samples yielded higher j and f factors than compoundenhanced fin samples. For one row, j and f factors of louver fin were 23% and 27% higher than those of compoundenhanced fin. For two row, those were 11% and 8%, and for three row, those were 10% and 9%. However, heat transfer capacities at the same pressure drop of the compound enhanced fins were 6.4% for one row, 11.1% for tworow and 13.6% for three row larger than those of louver fins, Existing louver fin correlation overpredicted the presentj factors and underpredicted the present f factors. Keywords : Compound enhanced fin, Heat transfer coefficient, Louver fin, Pressure drop