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Abstract The aim of this work is the study and the modeling of an Organic Rankine Cycle (ORC). Organic Rankine Cycles are used in low grade heat recovery applications. Their working fluid is a refrigerant or a hydrocarbon whose properties are adapted to the conditions in which the heat recovery is performed. An experimental study is carried out on an ORC recovering heat from hot air at a temperature ranging from 150 to 200°C. The expander used for this study is a volumetric scroll expander. The working fluid selected is R123 because of its high efficiency in ORC applications. During the testing period, the test bench is improved : the efficiency of the cycle and its output shaft power are increased. The “limits” of the cycle are investigated by modifying some parameters of the test bench : hot air source temperature, expander rotational speed, refrigerant charge, etc. It turns out that the refrigerant charge has a tremendous importance in the behavior of the cycle and that its optimal value has to be found in order to maximize the performances. The measurement uncertainties and the incoherencies detected during the tests are explained and an uncertainty propagation study is performed. The bench is also adapted to minimize these uncertainties. A model of each component of the cycle is proposed and validated. The whole cycle is simulated in order to have a good understanding of its behavior under different working conditions. The model is then used to optimize the cycle, starting from a basic case and improving it in a realistic way to evaluate the system potential. Finally, several improvements for the test bench are proposed, that could be applied in future works. 3PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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