In the present study, the heat transfer rate and operating conditions are specified. The specific entropy generation rate is considered as the objective function and the total heat transfer area is taken as a constraint. The heat transfer area allocation ratio, two side heat transfer areas, fin heights as well as the fin spacing are considered as decision parameters. The above model can be solved iteratively, thus, the specific entropy generation rate and the corresponding geometrical parameters of a plate-fin heat exchanger, i.e., fin heights of both the hot- and cold-side as well as the fin spacing, can be determined for a specific value of x with considering the total heat transfer area A as a constraint. The specific entropy generation rate can be minimized by choosing an optimal x subject to a finite heat transfer area constraint. In the iterative procedure, the numerical computation is considered to beconverged when the relative residual of the heat transfer rate Q
is less than or equal to 10 for the specified heat transfer rate requirement. The above numerical model is programmed and
solved with the FORTRAN language, and the thermodynamic properties of working fluid are calculated with REFPROP software version 7.1 [20] .
In the present study, the heat transfer rate and operating conditions are specified. The specific entropy generation rate is considered as the objective function and the total heat transfer area is taken as a constraint. The heat transfer area allocation ratio, two side heat transfer areas, fin heights as well as the fin spacing are considered as decision parameters. The above model can be solved iteratively, thus, the specific entropy generation rate and the corresponding geometrical parameters of a plate-fin heat exchanger, i.e., fin heights of both the hot- and cold-side as well as the fin spacing, can be determined for a specific value of x with considering the total heat transfer area A as a constraint. The specific entropy generation rate can be minimized by choosing an optimal x subject to a finite heat transfer area constraint. In the iterative procedure, the numerical computation is considered to beconverged when the relative residual of the heat transfer rate Qis less than or equal to 10 for the specified heat transfer rate requirement. The above numerical model is programmed andsolved with the FORTRAN language, and the thermodynamic properties of working fluid are calculated with REFPROP software version 7.1 [20] .
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