The goal of the present thesis is initially to determine if the ideal gas model is valid for the modelling of the refrigerant R-245fa for an ORC expansion in a radial turbine. Therefore, the expansion will be calculated using an ideal gas model and a real gas one. The results from both calculations will be compared in order to determine if the ideal gas model leads to valid results. After deciding which of the models leads to better results, this model will be used to perform an optimization of the radial turbine by varying its inlet width and the rotational speed.
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