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This study thermodynamically analyze the minimum temperature difference (D T ) of a cascade condenser of cascade refrigeration system using R134a-R23 in order to get maximum COP of the system, by considering different operating parameters. The operating parameters includes: (1) the condensing (T C ) and evaporating temperature (T me ) of R134a, (2) the condensing (T mc ) and evaporating temperature (T E ) of R23. This analysis was also done experimentally on a cascade refrigeration system using R134a-R23 as refrigerant pairs. The experimental results are validated with the theoretical results and the results were in good agreement with each other.

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