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44 Results and Discussion Figure 4-6: Application areas for ultra-high-speed drives and magnetic bearing (from Imoberdorf et. al. [61]) the technological limit when compared to MM. Also, the optimum MDM cycle operates at a significantly lower maximum pressure of 8.5 bar. Although the ORC system with MM as a working fluid results in a higher output power in the ORC system than MDM but the magnitude of gain (0.43 kW) is considerably less if the cost of the system with such high pressures and high speed turbine are taken into consideration. Although the optimum working fluid for this system based on the tool is MM, MDM is chosen as the real optimum fluid based on the above arguments. Table 4-3 shows a com- parative analysis of the optimized ORC turbogenerator, with hypothetical and real optimum fluids, with the system running on D4 based on Lang et al.[21]. The T-s diagrams comparing the three fluids has been illustrated in Figure 4-7 Table 4-3: Comparative analysis of the simulated optimized ORC turbogenerator Segment Number [-] Evaporator Pressure [bar] Condenser Pressure [bar] Condenser Temperature [oC] Turbine Inlet Temperature [oC] Total Mass Flowrate [kg/s] Thermal Power-Exhaust evaporator [kW] Thermal Power-EGR evaporator [kW] Net Power [kW] Net Efficiency [%] Hypothetical Optimum Fluid 4.62 15.62 0.483 97 260.82 0.213 26.31 32.01 10.09 17.30 Real Optimum Fluid (MDM) 5.15037 8.45 0.200 96.54 255.2 0.225 24.64 31.07 9.77 17.54 D4 5.7535 3.920 0.087 100.27 242.5 0.247 25.32 31.45 9.32 16.42 From the table it is clear that the net output power for MDM is more than D4. This is because of the higher turbine inlet temperature caused by a higher evaporator pressure and a lower condenser temperature. The net efficiency is also higher for MDM as the power produced is higher even when as the net thermal power to the system is lower. A higher condensing temperature might have been selected in the work of Lang et al. [21] as condensing pressures lower than the technological limit are obtained for lower temperatures [28]. In case Akshay Hattiangadi Master of Science ThesisPDF Image | Working Fluid Design for Organic Rankine Cycle
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