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Abstract:The purpose of this article was to compare different waste heat recovery system technologies designed for automotive applications. A complete literature review is done and results in two comparative graphs. In the second part, simulation models are built and calibrated in order to assess the fuel consumption reduction that can be achieved on a real driving cycle. The strength of this article is that the models are calibrated using actual data. Finally, those simulations results are analyzed and the Rankine cycle and turbocompound are the two most profitable solutions. However the simulations of the turbocompound shows its limitations because the impact on the exhaust pressure drop is not taken into account in the assessment of the car fuel consumption. Fuel reduction of up to 6% could be achieved, depending on the driving cycle and the waste heat recovery technology.

True off-design models must be charge-sensitive to be fully deterministic. • To account for the charge helps to identify the heat exchangers coefficients. • Hugmark's void fraction model shows the best results to simulate two-phase flows. • The presence of a liquid receiver arises numerical issues to model ORC systems. • The charge-sensitive model is validated with experimental data.

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In the present article, a model of scroll expander will be introduced. This model is able to evaluate the performance of a given machine with influence of the geometry. Several losses are also included by the model such as internal leakages, heat transfers or mechanical losses. The forces generated by the gas pressure on the involutes can also be calculated.That expander model is used in order to demonstrate its potential and provide some guidelines to the design of a new expander suitable for the application. NOTATIONS 0