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heat which approach the limit set for the analysis. The reason these values are not at the limit of 45 ̊C superheat is due to the condenser temperature being set for 25 ̊C. N-pentane has the highest degree of superheat with a value of 44.85 ̊C while Toluene has the lowest value of super heat at 5 ̊C. Pressure ratio varies from 3.108 for R227ea to 3.974 for water. The pressure ratio values can be considered to be optimal values as this is when the maximum isentropic efficiency occurs. Higher isentropic efficiencies produce more work output which will increase exergy efficiency. Depending on the fluid, higher superheat will increase isentropic efficiency as well. When superheat is increased, pressure ratio slightly increases for most fluids. The values of system exergy efficiency are shown in Figure 6.24; the values range from 8.42% for water to 11.76% for dimethyl ether. This is a 39.7% increase due to the change in working fluid between water and dimethyl ether. Table 6.1 shows the percent difference for the various fluids compared to Iso-butane which has the highest system exergy efficiency of 11.81%. Table 6.1: Percent change of system exergy efficiency between iso-butane and respective working fluids Fluid R134a Water R227ea R245fa Toluene Iso-Butane Acetone Iso-Pentane N-Pentane Dimethyl Ether % Difference Exergy Efficiency 11.00 40.26 23.11 8.55 28.73 0.00 10.68 2.16 5.54 0.43 76PDF Image | Exergoeconomic Analysis and Optimization of ORC
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