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자료유형
학술저널
저자정보
저널정보
대한설비공학회 International Journal of Air-Conditioning and Refrigeration Journal Of Air-Conditioning and Refrigeration Vol.12 No.3
발행연도
2004.9
수록면
158 - 167 (10page)

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Condensation heat transfer experiments were conducted with a oblong shell and plate heat exchanger without oil in a refrigerant loop using R-134a. An experimental refrigerant loop has been developed to measure the condensation heat transfer coefficient hr and frictional pressure drop Δpf of R-134a in a vertical oblong shell and plate heat exchanger. Four vertical counter flow channels were formed in the oblong shell and plate heat exchanger by four plates having a corrugated sinusoid shape of a 45° chevron angle. The effects of the refrigerant mass flux, average heat flux, refrigerant saturation temperature and vapor quality were explored in detail. Similar to the case of a plate heat exchanger, even at a very low Reynolds number, the flow in the oblong shell and plate heat exchanger remains turbulent. The results indicate that the condensation heat transfer coefficients and pressure drops increase with the vapor quality. A rise in the refrigerant mass flux causes an increase in the h_r and Δpf. Also, a rise in the average heat flux causes an increase in the hr. But the effect of the average heat flux does not show significant effect on the Δpf. On the other hand, at a higher saturation temperature, both the hr and Δpf found to be lower. Based on the present data, the empirical correlations are provided in terms of the Nusselt number and friction factor.

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ABSTRACT

1. Introduction

2. Experimental apparatus and method

3. Data reduction

4. Results and discussion

5. Conclusions

Acknowledgement

References

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