In this paper, the advanced exergy analysis was applied to a R744 booster refrigeration system with
parallel compression taking into account the design external temperatures of 25 C and 35 C, as well as
the operating conditions of a conventional European supermarket. The global efficiencies of all the
chosen compressors were extrapolated from some manufactures' data and appropriated optimization
procedures of the performance of the investigated solution were implemented.
According to the results associated with the conventional exergy evaluation, the gas cooler/condenser,
the HS (high stage) compressor and the MT (medium temperature) display cabinet exhibited the highest
enhancement potential. The further splitting of their corresponding exergy destruction rates into their
different parts and the following assessment of the interactions among the components allowed figuring
out the real achievable improvements. The avoidable irreversibilities of the HS compressor and that of
the MT evaporator were mainly and completely endogenous, respectively. On the other hand, the gas
cooler/condenser could be predominantly improved by decreasing the inefficiencies of the MT evaporator.
As regards the auxiliary compressor, large enhancements were attainable through the drop in the
irreversibilities occurring in the remaining components
