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Sustainability 2015, 7 15375 45 40 35 30 25 20 15 10 5 0 Working Fluid Figure 3. Optimized values of degree of superheat for considered working fluids. 3.05 3 2.95 2.9 2.85 2.8 2.75 2.7 2.65 2.6 Working Fluid Figure 4. Optimized values of pressure ratio for considered working fluids. N-pentane exhibits the highest degree of superheat (44.9 °C) and Toluene the lowest (5 °C). The pressure ratio varies from 2.75 for R227ea to 3.3 for water. Increasing isentropic efficiency produces more output power, which increases system exergy efficiency. Depending on the working fluid, a higher degree of superheat may increase isentropic efficiency. When superheat is increased, the pressure ratio increases slightly for most fluids. The system exergy efficiencies for various working fluids are shown in Figure 5, where values range from 15.4% for toluene to 21.9% for iso-butane. Systems using the working fluids iso-butane, R600 and R134a have the highest exergy efficiencies. Pressure Ratio Degree of Superheat (°C)PDF Image | Selection of Optimum Working Fluid for Organic Rankine Cycles
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