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Chapter 6: Results and Discussion 6.1 Identifying Proper Optimization Conditions The first results show what values of superheat and pressure ratio produce the highest system exergy efficiency. When running an optimization it is important to input guess values for the independent variables which are within close range to optimal values. For this case this entailed running a parametric study to see where the highest isentropic efficiency is achieved for a set superheat. Figure 6.1 is a parametric study using R227ea as the working fluid to see the effect of pressure ratio versus expander isentropic efficiency. 0.3 0.25 0.2 0.15 0.1 0.05 0 Degree of Superheat = 10 ̊C Degree of Superheat = 15 ̊C 3.5 3.8 4.1 4.4 4.7 5.0 5.3 Pressure Ratio 2.6 2.9 3.2 Figure 6.1: Isentropic efficiency vs. pressure ratio for R227ea The peak isentropic efficiency occurs when expansion is performed optimally. This requires that the pressure of the fluid after the constant volume pressure building section is the same as the condenser or outlet pressure (P2v = P2a). If the pressure is too high and 59 Isentropic EfficiencyPDF Image | Exergoeconomic Analysis and Optimization of ORC
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