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R502 has been extensively used as the working fluid in transport refrigerating vehicles and low temperature refrigerating machines. However, it is to be phased out by the end of 1995 due to its ozone layer depletion problem. In this study, both theoretical cycle analysis and experiments are carried out to examine the best substitutes for R502. Theoretical results indicate that the alternatives available in the market today may replace R502 without significant changes in the system when the suction line heat exchanger is not installed. When the system contains the suction line heat exchanger, however, COPs of the alternatives increase up to 15~20% as compared to the cases without the SLHX. But simultaneously, the compressor discharge temperatures increase significantly with the suction line heat exchanger. Actual test results obtained from a transport vehicle's refrigerator indicate a similar trend as that of the theoretical results. Especially, HFCs and their mixtures show lower compressor discharge temperatures than those of R502, which is one of the desirable features. Further research is needed to study the effect of the SLHX on the performance of the real machine as well as on the oil return for reliability of the system.

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Abstract

1. Introduction

2. Theoretical Analysis

3. Experimental Results

4. Conclusions

5. Acknowledgement

References

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UCI(KEPA) : I410-ECN-0101-2009-553-015261042