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자료유형
학술저널
저자정보
저널정보
대한기계학회 대한기계학회 논문집 B권 대한기계학회논문집 B권 제28권 제12호
발행연도
2004.12
수록면
1,535 - 1,548 (14page)

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Condensation heat transfer experiments were conducted with the oblong shell and plate heat exchanger without oil in a refrigerant loop using R-134a, R-407C and R-410A An experimental refrigerant loop has been developed to measure the condensation heat transfer coefficient h, and frictional pressure drop △Pf of the various refrigerants in a vertical oblong shell and plate heat exchanger The effects of the refrigerant mass flux(40~80kg/㎡s), average heat flux(4~8㎾/㎡), refrigerant saturation temperature(30-40℃) and vapor quality of refrigerants on the measured data were explored In detail Similar to the case of a plate heat exchanger, even at a very low Reynolds number, the flow m the oblong shell and plate heat exchanger remains turbulent A comparison of the performance of the various refrigerants revealed that R-410A had the highest heat transfer performance followed by R-134a, and R-407C had the lowest performance of the refrigerants tested The pressure drops were also reported in this paper The pressure drops for R-410A were approximately 45% lower than those of R-134a R-407C had 30% lower pressure drops than R-134a. Experimental results were compared with several correlations which predicted condensation heat transfer coefficients and frictional pressure drops Comparison with the experimental data showed that the previously proposed correlations gave unsatisfactory results Based on the present data, empirical correlations of the condensation heat transfer coefficient and the friction factor were proposed.

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Abstract

1. 서론

2. 실험장치 및 방법

3. 데이터 처리

4. 실험결과 및 고찰

5. 결론

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