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5-2 Recommendations 55 by using experimental data to correlate the coefficients. Furthermore, a better mapping technique needs to be developed. One possibility can be using a Taylor series approximation as shown in Chapter 2. The costs, in particular, of the heat exchangers are a major bottleneck in realizing such a system in actual trucks. Furthermore, the optimization of only the net output power does not lead to a system with maximum heat recovery as increased levels of evaporator pressure causes a high amount of regeneration which in turn leads to a lower heat recovery from the flue gas. Thus the optimization problem can be extended to a multi-objective optimization with a Pareto frontier to arrive at an optimal solution with the output power and costs being the objectives of this process. The preliminary radial turbine model has scope for further development. The design calculation uses values available for gas turbines in which the fluid has different properties from organic fluids. Further development of this model is possible if actual experiments are performed with organic fluids in order to acquire the required loss coefficients and other non-dimensional parameters. The design of the stator has not been included in this work. The nozzle throat opening length and throat area are limiting factors for the mass flow rate through the turbine. Furthermore, the flow is supersonic in the nozzle and hence its design is critical in order to have a shock-less turbine. Incorporation of a sophisticated computational fluid dynamics model into the same tool is not recommended at the moment as the objective of this tool should be to optimize the entire system with the working fluid and not only the turbine. The pinch point temperature analysis in case of supercritical cycle configurations has to be developed further. One of the ways to accurately calculate the pinch point might be to evaluate the temperature difference at points where the slope of the hot and cold fluid curves is the same. Finally, a more detailed component design would lead to determination of pressure drops, heat exchanging area and volume which are also important constraints in design of a compact heat exchanger. Future studies, in general, should be devoted to further development of the system through the study of the control using dynamic models, setting up experimental test bench to validate these models. Master of Science Thesis Akshay HattiangadiPDF Image | Working Fluid Design for Organic Rankine Cycle
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