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rather a set of them (Pareto front). This application shows the potentiality of the developed methodology, and allows to analyze a large variety of additional optimization problems, which could have different targets and/or different constrains and parameters. Recommendations The present study is focused on the regenerators, the cooler and the heater design. Further developments should include the design of the turbomachinery in order to consider the effects of the components efficiency in the system. This is specially important for the compressor, which operates close to the critical point. The design of the components is based on a steady state model. Future works should include their dynamic modeling since the heat exchangers are characterized a by large thermal inertia. This will play a fundamental role in the operation under transient conditions. Future projects should study the modification of the critical point of CO2 by means of gas mixtures that can adjust the critical temperature in order to bring it to levels that increase the possibility of using air as the heat sink in the condensation process of s-CO2 Rankine power generation systems. The design of both the cooler and the regenerator is based on a discretization procedure which evaluates each element as an individual control volume. Though it is effective, it implies long computational time and makes the parametrization slow. This is specially important for the cooler since it works close to the critical point, where the evaluation of the fluid properties is computationally more expensive. Future works should consider additional options to replace the fluid library with alternatives like look up tables or polynomial approximations directly programmed in the code. Despite the conclusions drawn in Chapter 3, the study of the application of the s-CO2 systems for aerospace propulsion seems promising. The main aim should be to decrease the weight of the regenerators as much as possible. This can be done varying the geometrical characteristics of the channels (channel diameter, wave length and angle, etc.) to improve the power density of the heat exchanger, using lighter materials for the manufacturing process, or analyzing additional options for compact heat exchangers. Future investigations should also consider the design of the external heater, which will bring additional complexity to the propulsion system and represents one of the largest challenges in this new propulsion concept. Regarding the second study case, the design of the heater is constrained to the heliostat field, which has the largest cost in the power tower system. However, the cost of the overall system is not known, and deeper analysis should be performed in order to determine the actual required investments. The preliminary heliostat layout obtained should be used as a starting point, and alternative arrangements, more detailed analysis of the efficiency factors, and time averaged evaluations should be studied as well. Master of Science Thesis J.S. Bahamonde Noriega 93PDF Image | Design method for s-CO2 gas turbine power plants
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