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Energy and exergy analysis of an efficient organic Rankine cycle for low temperature power generation Sami Clearly ORC operating with the quaternary refrigerant mixture has the highest energy efficiency compared to the others. Examining the exergy efficiencies displayed in Figures 12 and 13 shows that the quaternary refrigerant mixture has the higher thermal efficiency compared to the other refrigerants under study. R-245fa has the lowest thermal efficiency because of its low boiling point compared to the quaternary refrigerant mixture as well as others. Similar results can be observed from Figure 13 when examining the second law efficiencies. Furthermore, the results presented in Figure 14 clearly showed that the exergy destruction is much lower in conditions where the quaternary refrigerant mixture is used compared to other refrigerants. In addition the results displayed in this figure show that R-245fa has the highest exergy destruction among the refrigerants presented in this study. This is because of its low boiling point. 1 0.5 0 2000.0 1500.0 1000.0 500.0 0.0 CONCLUSIONS In this analytical study the performance of the Organic Rankine Cycle (ORC) has been analysed and discussed. Our proposed ORC uses a new quaternary refrigerant mixture that is environ- mentally sound and thermodynamically very efficient using low and medium waste heat. The mixture composition can be formulated to effectively capture heat at a wider range of temperatures than is currently available. Various comparative studies have been presented using energy, exergy analysis to demonstrate the superior performance of the proposed refrigerant mixture compared to alternative proposed fluids. The data presented clearly shows that the proposed quaternary refrigerant mixture has the capability to produce power from low and medium waste heat with significant thermodynamic efficiency and less exergy destruction. Figure 12 Exergy comparison of refrigerants. Figure 13 Comparisons between exergy and second law efficiencies. Figure 14 Exergy destruction. 1 0.8 0.6 0.4 0.2 0 Quaternary R-245fa R-11 R-114 Refrigerants Quaternary R-245fa R-11 R-114 Refrigerants Quaternary R-245fa R-11 R-114 Refrigerants 009PDF Image | Energy and exergy analysis of an efficient organic Rankine cycle for low temperature power generation
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