Assessment of factors influencing the wall heat transfer with regard to increasing efficiency and compliance with future CO2 limits for commercial vehicles

More than 125 years ago, Rudolf Christian Karl Diesel succeeded in putting the first 4-stroke heat engine, later called Diesel engine after its inventor, in operation [1]. The reached increase of efficiency, by three or four times compared with the efficiency of steam engines at this time, and the resulting advantage of the Diesel engine has not lost any actuality in today’s engine development ever since. Right now, confronted with strictly increasing emission control laws, while there’s a change to a multi-drive-technology path, the efficiency increase of the Diesel engine is more important than ever. Moreover the buyers demand is still a low total cost of ownership, which is depending mainly on the engines fuel efficiency.