Finally, an additional loss must be considered represented by the INK 128 required to drive the fan which would guarantee the required heat exchange toward the environment, if needed.
The heat recovery from the exhaust gases in ICE has an interesting potential and it is characterized by a cost increase per gram of CO2 saved very promising with respect to the other technologies. When an ORC-based power unit is considered, four contributions need to be evaluated to state the net recovery’s benefit: (a) the effect of the back pressure produced on the engine by the HRVG; (b) the weight increase of the vehicle due to the power unit; (c) the power recovered by the unit taking into consideration the off design conditions of the HRVG and that of the expander; (d) the additional power required to discharge the energy extracted at the condenser toward the environment.
The final use of the net power recovered as in electrical form or in mechanical form is an additional issue. Making reference to an IVECO F1C 3.0 L turbocharged diesel engine operated in an engine test bed, the paper discussed:(a)The effect of the back pressure produced by a real HRVG which fed an ORC-based power unit. The presence of an IGV turbine control makes the prediction of these effects not straightforward.(b)The effect produced by the weight increase due to the ORC-based power unit.(c)The recovery done by an existing power unit taking into account the off design situations produced on the HRVG and on the expander by engine speed variation.