Present work is an attempt to investigate on the
performance of combination of ejector-expansion
transcritical cascade (EETC) CO2 cycle with a singleeffect absorption refrigeration cycle. For
thermodynamic reasons, the CO2 entering the gas cooler
has a great potential to be used in bottom cycles. The
aim of proposing combined system, in this work, is an
attempt to capture the waste heat in the gas cooler. In
addition, proposed combined system can be accounted
as the best effort to achieve wide ranges of cooling
effect simultaneously. Using a constant-area mixing
model for the ejector and on the basis of first and
second laws of thermodynamics, an optimization of
system has been performed. Also exergy analysis is
carried out in order to show the irreversibility
distribution within the system and the contribution of
different components to the exergy destruction in the
cycle. Results indicate that increasing the generator
temperature from 67oC to 105oC results in an increase of
the COP and second law efficiency of the cycle by up to
56.5% and 73.5%, respectively. In addition, results
show that an increase in the cooling capacity ratio
increases both the COP and exergy efficiency of the
proposed system. Exergy analysis reveals that
compressor and ejector have the first and second highest
contribution of exergy destruction in the cycle,
respectively.