This paper documents a feasibility study on a waste heat recovery system for heavy-duty tr-uck engines based on an organic Rankine cycle (ORC) turbogenerator. The study addr'esses many ofthe challenges of a mobile automotive application: The system must be simple, efficient, r-elatively small, lightweight, and the working fluid must satisfy the many technical, environmental, and toxicological requirements typical of the automotive sector. The choice of a siloxane as the working fluid allows for the preliminary design of an efficient r-adial twbine, whose shaft can be lubricated by the working fluid itself. The system's heat exchangers, though mor'e voluminous than desirable, are within acceptable limits. The simulated ORC system would add approximately 9.6 kW at the design point, corresponding to a truck engine power output of 150 kW at 1500 rpm. Future work will be devoted to further system and components optimization by means of simulations, to the study of dynamic operation and coritrol, and will be followed by the design and construction of a laboratory test bench for mini-ORC systems and components.

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