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This paper presents the experimental study on temperature distribution of two-stage cascade vapor-compression system for achieving super-low temperature. Two-stage cascade vapour compression cycle is a method to achieve super low temperature under -80℃. This system requires two different types of refrigerant at higher and lower stages. However, by the Montreal protocol, several refrigerants for the low-stage system as well as high stages have been banned due to its threat to ozone layer. Alternatives retrofit refrigerant for replacing CFC and HCFC lies from HFC to natural refrigerant. In this study, azeotropic zero-ODP refrigerant, R508B blend of two HFC refrigerant R23/R116 (46.0/54.0) was utilized in the low stage cycle, this refrigerant has advantages based on normal boiling point compare to its compositing element. On this experiment, cooling chamber was filled with ethyl alcohol 0, 10, 20, and 25 liter respectively as refrigerant load. By changing the volume of cooling chamber fluid, temperature distribution of the system was observed. More ethyl alcohol mass in the cooling chamber, longer steady state condition achieved. It is also found that the change of ethyl alcohol in the cooling chamber gives little effect on the final temperature distribution.

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Abstract
1. INTRODUCTION
2. REFRIGERANT
3. TEST SETUP
4. RESULT AND DISCUSSION
5. CONCLUSION
ACKNOWLEDGEMENT
REFERENCES

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UCI(KEPA) : I410-ECN-0101-2009-550-016011461