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Introduction ORC-based CSP systems operating in the envisaged distributed generation sce- nario, possibly cogenerating thermal power for heating or cooling purposes. The second part of this thesis presents the contribution regarding the experimental and numerical investigation the non-classical gas dynamics behavior of dense va- pors of single- and multi-component organic fluids. A more detailed description of the chapters appearing in this part of the work follows. Chapter 7 describes the commissioning of the Flexible Asymmetric Shock Tube (FAST) experimental setup designed and built at the Delft University of Technol- ogy. The aim of this Ludwieg Tube facility is to measure the speed of propaga- tion of pressure waves in organic vapors, with the final objective of providing the first experimental evidence of the most exotic non-classical gas dynamics phe- nomenon, i.e., the rarefaction shock wave (RSW) in the dense vapor region of fluids formed by complex organic molecules. The facility operates at temperatures and pressures of the order of 400◦ C and 10 bar, respectively. A fast opening valve induces a rarefaction propagation in the tube, which is sensed by using dynamic pressure transducers. The equipment and measurement methodology are described in detail. The fast opening valve is char- acterized in terms of its opening time, which is proven to be small enough to allow for the detection of the RSW. The results regarding a shock wave forming in air are presented, and used to demonstrate and validate the setup capabilities. Prelim- inary expansion measurements in D6 siloxane are also presented, being of special interest to the end of the envisaged non-classical gas dynamics experiments. Chapter 8 presents the first investigation about the non-classical gas dynam- ics of binary mixtures of organic fluids in the vapour phase. Differently from mixtures of ideal gases, thermodynamic properties of dense vapours of multicom- ponent mixtures do not scale linearly with the mole fractions of each compound, as molecular interaction among different molecules plays a major role. The fun- damental derivative of gas dynamics Γ, being a derived thermodynamic property, is also affected by non-ideal mixing effects. In addition, experiments on the ther- mal stability of siloxane mixtures, and a deeper understanding on the chemistry of thermal decomposition of these compounds, show that, at temperatures close to the so-called temperature stability limit, a pure siloxane undergoes a rearrange- ment transformation, whereby small quantities of other compounds of the same family are formed. 7PDF Image | New Concepts FOR Organic Rankine Cycle Power Systems
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