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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한설비공학회 International Journal of Air-Conditioning and Refrigeration International Journal of Air-Conditioning and Refrigeration Vol.16 No.3
발행연도
2008.9
수록면
100 - 107 (8page)

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초록· 키워드

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The heat transfer and friction characteristics of heat exchangers having convex louver fills are experimentally investigated, and the results are compared with those of wave fin counterparts. Eighteen samples (nine convex louver fin samples and nine wave fin samples) which had different fin pitches (1.81 ㎜ to 2.54 ㎜) and tube rows (one to four) were tested. The convex angle was 11.7°. The j f factors are insensitive to fill pitch, while f factors increase as fin pitch increases. The effect of fin pitch on factor is more significant for the wave fill compared with the convex louver fill. It appears that the complex fill pattern of the convex louver fin induces intense mixing of the flow, and thus reduces the effect of fin pitch. Both the j and f factors decrease as the number of tube row increases. However, as the Reynolds number increases, the effect of tube row diminishes. Comparison of the convex louver fin j f factors with those of wave fin reveals that convex louver fin j f factors are 18% to 29% higher than those of wave fin. The f factors are 16% to 34% higher for the convex louver fin. The difference increases as fin pitch decreases. Existing correlation fails to adequately predict the present data. More data is needed for a general correlation of the convex louver fin geometry.

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Abstract
1. Introduction
2. Experiments
3. Results and discussions
4. Conclusions
References

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