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0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 R-245fa R-123 Benzene Ethanol R-236ea R-245ca R245fa-Pantane 50 100 150 200 250 300 Exhaust Gas Temperature (°C) Figure 23. Optimized thermal efficiency against exhaust gas temperature with one mixture (R245fa-pentane) of fixed constitution and composition. 18000 16000 14000 12000 10000 8000 6000 4000 2000 R-245ca R-245fa R-123 Benzene Ethanol R-236ea 0 R245fa-Pentane 50 100 150 200 250 300 Exhaust Gas Temperature (°C) Figure 24. Optimized work per unit exhaust gas mass flow rate against exhaust gas temperature with one mixture (R245fa-pentane) of fixed constitution and composition. From Figure 23 and 24, I found that the working range of R-245fa changed (85-170 °C instead of 80-150 °C) as pentane is added. However, the cycle performance decreased as pentane is added, which is most likely caused by three reasons. First, the assumed temperature difference between the working fluid and the exhaust gas in the evaporator may not be a reasonable assumption, since the temperature profiles should be more closely matched [20]. Second, the composition (fractions of the components in the mixture) has not been optimized for simplicity, which can reduce the cycle performance. Third, there is a possibility that adding pentane to R- 29 Work per Unit Exhaust Mass Flow Rate (W/kg) First Law Efficiency ( )PDF Image | Working Fluid Selections in Organic Rankine Cycle ICE
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