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Abstract
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This work deals with an exergoeconomic analysis for a new integrated power/cooling cogeneration
system using zeotropic mixtures as working fluids with two levels of cooling temperature. The proposed
system is comprised of two combined ejector refrigeration and power (CERP) cycles with different
configurations using geothermal energy as the heat source. One subsystem is a conventional CERP
system called basic subsystem and the other one is a CERP system employing a vapor-liquid separator
called the bottoming subsystem. These subsystems are connected via a cascade heat exchanger in a
parallel mode. The results of the parametric study show that geofluid mass fraction (that indicates the
amounts of the mass flow rate of geofluid served thermal energy for basic and bottoming subsystems)
has the biggest effect on the proposed system in comparison to other operating parameters. Furthermore,
a multi-objective optimization with energy and exergy efficiencies and overall unit cost of products
as objective functions is carried out for both basic and integrated CERP systems. The results of the
comparison study for optimized systems show a significant performance improvement for the proposed
system in comparison to the basic system. In this case, for the integrated CERP system, energy and exergy
efficiencies increase by 3.88% and 4.76%, respectively, while the overall unit cost of products increases by
0.96 $ GJ1, in comparison to the basic CERP system.
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