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Energy and exergy analysis of an efficient organic Rankine cycle for low temperature power generation Sami 3000 2500 2000 1500 1000 500 0 20 15 10 5 0 Figure 11 has been constructed to show the impact of increasing the flue gas flow rate on the power produced (kWe) after waste heat recovery. These results were generated at a flue gas temperature of 400oF (204oC). The data displayed in this figure clearly show that higher flows will result in increased power production. This suggests that systems with higher thermal capacities would produce more power. However, it is important to assess the impact of the various parameters involved during the waste heat recovery process; such as heat losses, stack backup pressure, dew point and heat loss in the chimney and in order to select the optimised size and number of units and circuits of waste heat recovery boiler for a particular application. Figures 12 and 13 have been constructed to present the energy and the second law thermal efficiencies and exergy performance results of the various fluids used in this study; namely R245fa, R-114, R-11 and the quaternary refrigerant mixture. To facilitate the comparisons of the refrigerants under question, the same heat source and sink conditions were used; 4.5 MW, 235oF 008 Figure 9 Output power produced is displayed for temperature of flue gases. 350 400 450 500 550 600 Temperature of waste heat oF Figure 10 ORC output at low temperatures. 200.46 220.16 249.72 300.21 350.71 399.97 T (WBH) oF (112oC) and 85oF (29oC) respectively. Operating parameters were selected to yield the same flow rate in each case. 2500 2000 1500 1000 500 0 Figure 11 Power produced at various gas flue rate. 100,000 320,000 400,000 500,000 Flue gas flow rate lb/hPDF Image | Energy and exergy analysis of an efficient organic Rankine cycle for low temperature power generation
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