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was evaluated at every 10 Psia instead of every 25 psia. R-245ca cannot be used above 100 psia since the temperature of the fluid would exceed the maximum temperature allowed in the cycle. This shows that the fluid would be more efficient in higher temperature waste heat applications, such as a solar thermal ORC. The trends shown in the above plot are consistent with those expected, and show a decrease in thermal efficiency with an increase in maximum temperature for each given pressure. The trend shown in Figure 2.5 above is the same as the trend shown with R-245fa at low working pressures but the trend shown in the higher pressures of the R-245fa analysis are not seen. This could be due to the fact that the cycle has been evaluated at below optimum conditions and the best operating point for this working fluid has not been found. It could also be that the trends shown in the first analysis of R- 245fa were flawed in some way. The maximum efficiency shown in Figure 2.5 is about 7% which is far below the maximum efficiency seen when using R-245fa as a working fluid. Since the ORC in the previous study, using R-245fa as the working fluid had a maximum efficiency of about 10% it is assumed again that R-245ca could be utilized in a more efficient method if higher temperature heat sources were used. The same analysis was again performed for another dry refrigerant, R-123. The results for each iteration and analysis of an ORC are shown below using R-123 as the working fluid within the cycle. In Figure 2.8 it is shown that the thermal efficiency of the cycle is affected by varying the maximum temperature within the ORC. 33PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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