Abstract
In the present study, the effects of variation in evaporator and condenser temperatures on first and second law efficiency of the cascade system using NH3/CO2 (Ammonia-Carbon dioxide) and C3H6 /CO2 (Propylene -Carbon dioxide) pairs have been carried out. The optimum temperature in cascade condenser temperature corresponding to maximum exergetic efficiency is also determined under for these conditions. It is observed that maximum COP and maximum exergetic efficiency occur at the same cascade condenser temperature. It is observed that optimum cascade temperature increases with increase in evaporator temperature, condenser temperature and approach in cascade condenser. The optimum temperature in cascade condenser for C3H6/CO2 pair is higher than that for NH3/CO2 pair. NH3/CO2 pair offers better exergetic efficiencies at optimum cascade condenser temperature than C3H6/CO2 pair. This also means that overall exergy destruction in NH3/CO2 pair is less than C3H6/CO2 pair.
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