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The most significant concerns related to vapour compression refrigeration systems (VCRS) refer to environmental behaviour and energy efficiency. The present study is taking into consideration the refrigerant R600a due to its very good thermodynamic properties and environmental position. On the other hand, the maximum performance of such a system will be identified by the help of the laws of thermodynamics. This is due to the fact that the analysis based exclusively on the energy analysis will not reveal where the performance of the system is degraded and how intense. After the formulation of the specific mathematical background, within the analysis have been varied the evaporation temperature in the range (–22, –8) ° C. Exergy losses in the main components of VCRS were assessed; the energy and exergy efficiencies of VCRS – as well. Resulted that the system is working at its highest efficiency for the highest evaporation temperature considered: for t e  = –8°C, the energy efficiency is 2,7 while the exergy efficiency is 55%. The most inefficient component part was found to be the compressor, while the most efficient is the evaporator. Such an analysis is very useful when aiming the design, the optimization and performance assessment of VCRS.

Energy and exergy analysis of a VCRS working with R600a within a thermodynamic analysis