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5.1 Conclusion CHAPTER 5 Overall an organic Rankine cycle was analyzed in many different applications and aspects. The first analysis was that of a theoretical organic Rankine cycle. This was done in order to compare the thermal efficiency of the cycle at various operating points. It was found that R- 245fa is a more efficient working fluid at lower temperatures than R245ca. It was also found that R-123 was more efficient at higher power systems because it had an efficiency over 10% when it the cycle was forced to produce more energy. The boiler pressure and temperature also have a big effect on the efficiency of the cycle. The results vary for the fluids but most of the fluids are more efficient at higher pressures since they are able to produce more power at a higher pressure. The cycle was also analyzed using isentropic efficiencies for the pump and turbine. This showed that the thermal efficiency was linearly proportional to the isentropic efficiency of the turbine. The mass flow rate also has a very big effect on the ability of an ORC to produce power. This is very evident with the first STORC analyzed. It was found that using ETC’s to produce power with an ORC is economically unfeasible. This is because the ETC’s require a low mass flow rate through the collector and an ORC requires a high rate of heat input even though it can run at relatively low temperatures. The second solar analysis showed that PTC’s produce temperatures that are too high to operate an ORC because the temperatures are greater than the critical point for many organic based fluids. An ORC was also modeled in a computer program, Cycle-Tempo, in order to see how an 99PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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