Recovery of exhaust and coolant heat with R245fa organic Rankine cycles in a hybrid passenger car with a naturally aspirated gasoline engine

► Steady state engine advantages of ORC are significant. ► Exhaust ORC may increase fuel efficiency by 3.4% with maximum of 6.4%. ► Coolant ORC may increase fuel efficiency by 1.7% with maximum of 2.8%. ► Combined ORC may increase fuel efficiency by 5.1% with maximum of 8.2%. ► Actual advantages on vehicles covering driving cycles needs further investigations.