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초록· 키워드

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CFC-12, which has been used most widely in automobile air conditioners and household refrigerators, is scheduled to be phased out soon because of its high ozone depletion potential. Now HFC-134a is suggested as an alternative refrigerant for CFC-12.
In this study, we intended to investigate how PAG oil influences evaporation heat transfer and flow pattern, using R-134a and PAG oil in the horizontal micro-fin evaporation tube.
Experiments were conducted under the following test conditions : mass velocity 86~250㎏/㎡s, heat flux 5~30㎾/㎡, oil concentration 0~21 wt.% and saturation temperature 5℃.
Local evaporation heat transfer coefficients were found to be higher at the top, side and bottom of the tube in this order. Average heat transfer coefficients turned out to increase with oil concentration increment up to 3 wt.% oil concentration, whereas heat transfer coefficients gradually decreased over 3 wt.% oil concentration, because of oil-rich liquid film formed on the heat transfer surface.
Flow patterns were rapidly transitioned to annular regimes up to 3 wt.% oil concentration. In case of pure refrigerant, measured heat transfer coefficients in the experiments were similar to those of Kandlikar’s correlation.

목차

Abstract

1. Introduction

2. Experimental Facilities and Data Reduciton

3. Result and Discussion

4. Conclusion

Acknowledgements

References

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UCI(KEPA) : I410-ECN-0101-2009-553-015261193