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Compared to [3], Figure 19-22 have demonstrated the validity of the model because they match the literature [3]. The two dry fluids (section 2.2.2) do not require superheating in the model, which is confirmed by [3]. Ethanol is a slightly wet fluid, and water is a very wet fluid. Both of them require superheating to optimize the cycle performance, as expected in [3]. 7. MIXTURE Mixtures were briefly studied in this project. The main objective is to show the accommodation of the model to mixtures instead of selecting the best mixtures. 7.1. Introduction Pure substances boil and condense isothermally, making the temperature profile of the working fluid giving a mismatch between the temperature profile of the heat source and that of the sink [4], as shown in Figure 19-22. This creates large irreversibilities in the cycle, reducing the cycle performance and maximum possible mass flow rate [20]. Zeotropic mixtures have the properties of boiling and condensing at changing temperature at constant pressure. These fluids thus are more suitable to be used in the ORC because they can closely match the temperature profiles of the heat source and sink to increase the cycle performance [20]. However, using mixtures can introduce more variables that need to be optimized into the cycle. Specifically, constitutions (i.e. combinations of different substances) and compositions (i.e. fractions of substances in a mixture) are the two most significant variables [4]. Researches about the applications of zeotropic mixtures in the ORC are few and usually focus on specific conditions [20]. 7.2. Simulation Due to the time limitation of this project, only one mixture was investigated through my model and compared with the performance of pure substances. The objective of this simulation is to demonstrate the accommodation of my model to mixtures rather than search for the best candidate to be used in the cycle. The mixture studied is R245fa-pentane with a mole fraction of 32% R245fa and 68% pentane (mass fraction is 47% R245fa and 53% pentane), which was selected from [20]. The constitution and composition of the mixture was fixed in this preliminary study. The results are shown in Figure 23 and 24. 28PDF Image | Working Fluid Selections in Organic Rankine Cycle ICE
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