Exergy destruction rate minimization in the absorber of a double effect vapor absorption system
2021
Despite the wide applications of multi-effect vapor absorption systems, their
energy requirement is relatively higher. Also, their exergy analyses found
in the literature reveal that the exergy destruction rate at the absorber is
quite significant and has the potential for improvement in its energy
efficiency. In this work, the exergy destruction rate at the absorber is
minimized using the penalty factor method against the optimized generator
temperature of the double-effect vapor absorption system by considering
absorber, evaporator, and condenser temperatures into consideration.
Modeling of the double-effect vapor absorption system was performed using a
thermodynamic toolbox in SIMULINK. The present model employed a refrigerant
heat exchanger to enhance the system cooling capacity. The Liquid-vapor
ejector valve at the absorber also improved the mixing of the solution and
refrigerant vapor resulting in lower irreversibility of the system. Results
show that the coefficient of a performance increase by 2.4 % with
refrigerant heat exchanger and exergy loss at absorber decrease by 9.4 %
with ejector. The optimum performance was seen at the condenser and
evaporator temperatures of 308.8 K and 278.1 K, respectively with an 8.2 %
improvement in exergetic efficiency. Finally, it is concluded that the
multi-effect absorption system shows better performance by minimizing the
irreversibility.
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