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Conclusions & Perspectives usually adopted short-sighted strategies. However, this figure is amplified to more than 10% in terms of net present value of the investment when applying the complete financial analysis presented here. Notably, the storage capacity for which maximum profitability occurs seems to be independent from the considered operating strategy. The potential of optimal control in terms of investment cost reduction has been unveiled for the first time. For the case-study technology considered, this follows the possibility of harvesting the same revenue with a smaller TES capacity. The results have been obtained with open-source software, and a total of about 50 code lines, which makes the developed tools quite understandable and user-friendly. The proposed methodology could be easily implemented as an extension of reference design models, such as those available within the SAM program. The proposed methodology constitutes a new tool in the designer’s hands who, depending on the specific project characteristics and financial framework, may be keen on favouring a larger electricity production or a comparatively lower investment cost. Notably, this could be of particular interest for ORC-based CSP systems operating in the envisaged distributed generation scenario, possibly cogenerating thermal power for heating or cooling purposes. The second part of the thesis is focused on the experimental and numerical investigation of the non-classical gas dynamic behavior of dense vapors of single- and multi-component organic fluids. Notably, ORC power systems constitute the first foreseen application for the arguments dealt with in this part. Chapter 7 describes the commissioning the FAST setup, a new Ludwieg tube facility designed and built at the Delft University of Technology with the main purpose of providing the first experimen- tal evidence of the most exotic non-classical gas dynamics effect, i.e., the rarefaction shock wave (RSW) in the dense vapor region of fluids formed by complex organic molecules. The setup components and the control & operation strategy devised are proven to be effective to the end of accurately measuring the speed and the intensity of the propagating waves. Results for several ideal gases are presented. The fast opening valve, which is the most critical component, is characterized in terms of its opening time, which resulted of the order of 2 − 5 ms. According to previous studies, this should be small enough to ensure the complete formation of the phenomenon of interest, i.e. a shock wave, within the shock tube. This result is confirmed by analyzing a compression shock wave propagating in air. The first published results regarding speed of sound measurements performed in the dense- gas region of a molecularly complex organic compound, i.e. siloxane D6, are presented. The FAST setup and the developed measurement procedure constitute unique tools to the end of proving the existence of the RSW. Furthermore, a number of interesting secondary results can be obtained, such as, notably, speed of sound measurements. Chapter 8 presents the first theoretical investigation of non-classical gas dynamic phenomena in dense vapours of organic mixtures. In particular, the effect of non-ideal mixing on the thermody- namic properties relevant to the fluid dynamics was studied. 233PDF Image | New Concepts FOR Organic Rankine Cycle Power Systems
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