Open AccessExergy destruction rate minimization in the absorber of a double effect vapor absorption system
Author(s) -
Muhammad Usman,
Muhammad Kamran Sajid,
Haseeb Yaqoob,
Muhammad Jamil Ahmad,
Muhammad Fazal Ul Basit,
Tauseefur Rehman,
Hafız Muhammad Ali
Publication year - 2022
Publication title -
thermal science/thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci201016222m
Subject(s) - exergy , evaporator , refrigerant , condenser (optics) , heat exchanger , exergy efficiency , materials science , thermodynamics , injector , absorption (acoustics) , coefficient of performance , work (physics) , nuclear engineering , mechanics , composite material , engineering , physics , optics , light source
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.