BOTTOMING CYCLE FOR HEAVY DUTY VEHICLES
The aim of this study is to convert exhaust heat of internal combustion engines into mechanical energy and to transfer it to the crankshaft; for Diesel engines this may improve the overall efficiency from 40% to about 50%. In this study a bottoming cycle unit for a turbocharged 6- cylinder Diesel engine installed in a long-haul truck (207 kW at 2000 rpm) was developed, constructed and tested; different working fluids were compared. The choice of the working fluid fell ultimately on steam. A radial turbine was chosen, the other components of the Rankine engine were selected according to conventional practice. A gear box was used to connect the bottoming and Diesel engines. At design point, turbine speed was 100,000 rpm and its useful power approximately 19.4 kW. Results: High speed of turbine shaft and high temperatures prevented use of contact seals, leakage of the sealing steam had to be supplemented by treated boiler feed water and accommodation of the bottoming cycle components demanded some of the payload capacity. Therefore, this version of exhaust gas utilisation is uneconomic, at present prices for Diesel and distances travelled in Europe.
Bibliographic Reference: EUR 10320 DE (1985) MF, 163 P., BFR 300, BLOW-UP COPY BFR 815, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124107300 / Last updated on: 1987-01-01
Available languages: de