Entropy produced in classical and green designs

In the course of this chapter the economic-driven design (classical design) was implicitly compared with a new bi-optimized design (green design) for the case of a MTBE RD column. A set of indicators can be used to compare both designs ( ) exergy loss and a) closed loop control performance. 

The exergy loss (or entropy produced) can be extracted from the Pareto curve presented in figure 8.9. The relevant data for the classical and green designs and for the fully exergy-driven design i.e. w = [0 l] ) are hsted in table 8.7. 

The shadow prices can be computed directly out from the data in table 8.7 or from the Pareto curve in figure 8.9. It was foimd that, when compared to the classical case, 

The closed loop control performance of both designs is now analyzed. The disturbance scenario under consideration is the one used previously in section 7.3. Thus, a step variation in the flowrate of methanol during the time horizon of 6-10 s is given by. 

In this chapter three performance criteria were introduced in the RD design problem derived from a life-span perspective. The incorporation of those performance criteria resulted in designs with structural differences and with balanced economic-performance, thermodynamic efficiency and that are capable of coping with a realistic disturbance scenario. Thus, the material presented in this chapter effectively answers Question 7. 

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Table 8.7. Entropy produced in classical and green designs. Remarks classical design corresponds to ly = [1 0] green design corresponds...

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