A MULTI-VANE EXPANDER, BY ADDING POWER, CAN IMPROVE THE FUEL ECONOMY OF LONG-HAUL DIESEL TRUCKS

A Rankine bottoming cycle for waste heat recovery from diesel engines used in long-haul trucks has the potential of improving peak fuel efficiency by up to 15% over a typical duty cycle. Of all Rankine cycle system components, the expander is the most important and the most difficult to design for high efficiency. The design and preliminary evaluation of a nominal 40 hp multi-vane rotary expander developed for this application are described. Key features of a multi-vane expander for the diesel truck engine include: ruggedness and close match to diesel speed characteristics, high efficiency over a wide range of conditions, adaptability to a simplified control system, and a firm basis of hardware experience. Potential advantages of the expander for the diesel engine bottoming cycle include the elimination of a high-speed turbine/gearbox combination and over 80% isentropic engine efficiency. Areas requiring additional work include additional cycle analysis to quantify the best cycle and components, development of an expander for this specific application, and integration and testing of an entire Rankine system on a diesel engine.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Presented at SAE West Coast Meeting, San Diego, 7-10 August 1978.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Robertson Jr, C S
  • Eckard, S E
• Publication Date: 1978

Media Info

• Features: References;
• Pagination: 22 p.
• Serial:
  • SAE Technical Paper
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0148-7191
  • EISSN: 2688-3627
  • Serial URL: http://papers.sae.org/

Subject/Index Terms

• TRT Terms: Design; Diesel engines; Diesel trucks; Fuel consumption; Rankine engines; Transducers
• Uncontrolled Terms: Design features; Heat recovery
• Old TRIS Terms: Expander; Rankine cycle
• Subject Areas: Design; Energy; Motor Carriers; Safety and Human Factors;

Filing Info

• Accession Number: 00396989
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 780689, HS-025 557U
• Contract Numbers: DOE-EY-77-C-02-2832
• Files: HSL, USDOT
• Created Date: Aug 31 1985 12:00AM