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Chapter 4: Modeling Model validation Taking into account the different submodel parameters identified in the previous sections, the predicted expander shaft power is compared to the measured one. Figure 49 shows that all measurements are predicted within 10% error. The error is higher for the global cycle model because of the cumulated errors of the subcomponent models. 2.5 Model exploitation This section illustrates how the simulation models established and validated in the previous sections can be used to optimize the working conditions of the system. ORC test rig The global validated model of the ORC test rig allows understanding its behavior under various operating conditions. It can also be used to estimate the potential of performance improvement. The increase of the system performance following this optimization is evaluated hereafter for one of the 39 measured performance points, characterized by Psu,exp = 7.91 105 Pa, Pex,exp = 1.84 105 Pa, Tsu,exp = 133°C and Nexp=2660 rpm. Figure 50 shows the T-s diagram of this working point, with superposition of the secondary fluids temperature profiles. Large vapor superheating at the Figure 49: Predicted vs. measured shaft power with the global model of the cycle 21PDF Image | Organic Rankine Cycles for Waste Heat Recovery and Solar Uses
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