Abstract
In this paper, various eco-friendly refrigerant mixtures R430A, R436A, R436B, R435A, and R510A used in vapour compression refrigeration systems are considered for this study. All of them have zero ODP and very low GWP. On the basis of exergy features, the efficiency of various working fluids in vapour compression refrigeration cycles was compared. The exergy efficiency of mixtures is evaluated for various evaporating temperatures ranging from -40°C to -5°C at a constant condensation temperature of 45°C. The variation of exergy is also analyzed for various condensation temperatures ranging from 25°C to 60°C at a constant evaporating temperature of -10°C. The exergy losses in various components are computed and presented in Grassmann diagrams for a cooling load of 1 kW. The results indicate that all the investigated alternative refrigerant mixtures have higher exergy efficiency than R134A. The maximum exergy performance is 39.72% observed for the mixture R435A at an evaporation temperature of -30°C, and this value is 9.89% higher than that of R134a.The results also show that the highest and lowest exergy losses have occurred in the compressor and evaporator.
Highlights
In response to the phase-out of CFCs, which have a significant ODP, R134a has been created and is being used in home refrigerators [1]
Using R134a and alternative refrigerant combinations, an exergy analysis was carried out in a vapour compression refrigeration system among the temperatures of evaporation and condensation ranging from -50°C to -40°C and 25°C to 60°C, respectively
Based on exergy analysis on the performance of alternative refrigerant mixtures in the vapour compression refrigeration system, the following conclusions were drawn: (i) All the investigated refrigerants have a higher value of exergy efficiency than R134a (ii) The highest and lowest exergy efficiency in the system is 39.6% and 36.61% for the mixtures R435A and R436A, respectively, while R134a has only 36.10%
Summary
In response to the phase-out of CFCs, which have a significant ODP, R134a has been created and is being used in home refrigerators [1]. As per Kyoto [3], it is considered a greenhouse gas, and the production and use of the same will be completed in a few years. It is to be replaced by eco-friendly refrigerants [3, 4]. Park and Jung [7] conducted an investigation of the energy efficiency of R430A in a domestic water purifier as a potential choice refrigerant to R134a. They found that the energy consumption is 12% lower than that of R134a with
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