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Table 6: Effect of pinch point temperature on exergy loss in evaporator (exeloss1) By having different setups in EES model, it was concluded that for ORC plants with more output power and higher input temperature, most of exergy loss occurs in evaporator. That is while that for smaller plants with less heat source temperature exergy loss of turbine will be the most dominant one (exergy loss 3). These results are concluded from Table 7 with a rather high power cycle and Table 7 with rather lower heat source ORC. By comparing several articles (e.g.: Wang 44, Tchanche 45) these results can be confirmed as well. Comparing situations in these articles shows, in solar desalination unit with low powers most of exergy loss comes from turbine, but in cement industry with more ORC power, evaporators are the spots with most of exergy losses. Furthermore, it is known that for small scale applications about 90% efficient heat exchangers 46 and for larger scale ORCs, efficient turbines are in the market now. This confirms the above results as well. Table 7: Low heat source temperature ORC (ORC cycles with heat source temperature of mostly less than 150°C). In Table 9, it is also shown that by increasing the pinch point temperature, evaporator exergy loss (exeloss 1) will be increased and this will make its exergy loss even higher than in turbine. It is also concluded that same trend as thermal efficiency for exergy efficiency exists. With more degree of superheat both efficiencies will go down. This is concluded from Table 9. Table 8: Exergy efficiency changes with degree of superheat 44 Jiangfeng Wang, Yiping Dai, Lin Gao, Exergy analyses and parametric optimizations for different cogeneration power plants in cement industry, Applied Energy 2009; 86: 946. 45 B.F. Tchanche, Gr. Lambrinos, A. Frangoudakis, G. Papadakis, Exergy analysis of micro‐organic Rankine power cycles for a small scale solar driven reverse osmosis desalination system. Applied Energy 2010; 87: 1303. 46 AIREC; available at: http://www.airec.se/; as accessed: 17.06.2009. 54PDF Image | Exergy
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