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Chapter 4 Results and Discussion The following chapter presents the results and discussion of the optimization problem defined in Chapter 3. The validation of the ORC turbogenerator model and the thermodynamic model have been presented followed by results of the optimization and the turbine models. The influence of the turbine model on the optimization problem has also been discussed. 4-1 System model validation The ORC turbogenerator model has been developed in Cycle-Tempo which is based on the work of Lang et. al. [21] with the input parameters as mentioned in the previous chapter. The simulated results of this model from Cycle-Tempo has been validated against the same paper. Table 4-1 presents a comparison of these results. The mass flow rate and the net Table 4-1: Comparison of the system model with reference model Segment Number [-] Evaporator Pressure [bar] Condenser Pressure [bar] Condenser Temperature [oC] Turbine Inlet Temperature [oC] Total Mass Flow rate [kg/s] Turbine Efficiency [%] Thermal Power-Exhaust evaporator [kW] Thermal Power-EGR evaporator [kW] Net Output Power [kW] Net Efficiency [%] This Work 5.7535 3.920 0.087 100.27 242.5 0.246 81.05 25.32 31.45 9.32 16.42 Lang et. al. [21] 5.7535 3.920 0.087 100 242.5 0.266 78 27.4 34.2 9.6 15.6 power output in this work are lower than the reference work. It is also worth noting that a lower net thermal power is transferred in the model developed in this work. One of the reasons for the difference in the net thermal power transferred can be related to the flue gas composition chosen for this model. The flue gas is assumed to have a composition based on a diesel engine used in the work of Bombarda et al. [38] while Lang et al. have determined the Master of Science Thesis Akshay HattiangadiPDF Image | Working Fluid Design for Organic Rankine Cycle
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