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Energy and exergy analysis of an efficient organic Rankine cycle for low temperature power generation Sami exit varies between 800oF (426oC) to 1000oF (537oC). In addition the flue gas temperature after the steam generator is around 300oF (148oC) to 400oF (204oC). At this temperature range we can recover heat and produce power at significantly higher efficiency than other fluids. The results of the comparative study have been plotted in Figures 5, 6 and 7. It is evident from Figure 5 that using our refrigerant mixture results in lower values of NHR and more power production at the same heat input at the waste heat boiler. This is mainly due to the lower boiling temperature of the mixture and higher latent heat of evaporation compared to the refrigerants under investigation. Figure 7 displays the system efficiency using our refrigerant mixture compared to the other 3.00E + 04 2.50E + 04 2.00E + 04 1.50E + 04 1.00E + 04 5.00E + 03 0.00E + 00 30 25 20 15 10 5 0 refrigerants under investigation. It is apparent that our refrigerant mixture has the maximum cycle efficiency. This is due to the increase in work produced at the same waste heat recovery at the waste heat boiler as shown in Figure.7. This comparison is significant since it compares the refrigerant mixture efficiency to that of R-245fa which is considered as alternative to the CFCs R-11 and R-114 in chillers and ORCs applications. The enhancement of efficiency is significant due to the use of the mixture. This is due to the high heat transfer ratio between the thermal energy and kinetic energy at the turbine side as well as the pressure ratio. The impact of integrating the ORC using the proposed mixture on a typical gas turbine system using a steam Organic Rankine Cycle is shown in Figure 5 NHR for various refrigerants. R-245fa R-LSES R-11 R-114 Refrigerants Figure 6 Efficiency for different refrigerants. 006 R-245fa R-LSES R-11 R-114 RefrigerantsPDF Image | Energy and exergy analysis of an efficient organic Rankine cycle for low temperature power generation
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