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Analysis of R134a Organic Regenerative Cycle

The analysis of organic regenerative cycles is necessary to verify the 
possibilities of increasing the work and efficiency of a thermodynamic cycle 
according to some control parameters. The results obtained from this work can 
be beneficial in several areas such as solar thermal energy. Simulations of an 
organic regenerative cycle with up to 4 extractions were carried out in order 
to analyze the behavior of maximum efficiency and the work generated in the 
turbine. R134a was used as an organic fluid, used in low temperature cycles. 
Evaporation temperature data between 60°C and 100°C and superheat temperatures 
equal to 120°C, 200°C and 300°C were tested for cycle analysis. Thus, it was 
possible to verify the work behavior and maximum efficiency depending on the 
number of extractions, superheating temperature and evaporation temperature. 
The models and simulations were made using the Engineering Equation Solver 
(EES) software and the results were analyzed in Excel. It was concluded that 
the maximum efficiency increases with the increase of the evaporation 
temperature and the number of extractions and decreases with the increase of 
the superheat temperature. The turbine work grows by increasing the evaporation 
and superheat temperatures, but decreases with the increase in extractions.