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5 PARASITIC LOSSES OF ENERGY
Pages 70-81

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From page 70...
... given in the latest versions of the 21CTP Roadmap (DOE, 2006a) : Goal 1: Develop and Demonstrate Advanced • Goal 1: Technology Concepts That Reduce the -- Develop and demonstrate advanced technology Aerodynamic Drag Of A Class 8 concepts that reduce the aerodynamic drag of a class Tractor-Trailer Combination by 20 percent 8 highway tractor-trailer combination by 20 percent (from a Current Average Drag Coefficient of (from a current average drag coefficient of 0.625 to 0.625 to 0.5)
From page 71...
... tools. The final prod- Reports on the work on aerodynamic drag from 2006 appear ucts are validated CFD tools that can be used to reduce in a different form as parts of the annual progress report of aerodynamic drag of heavy truck vehicles and thus improve the Heavy Vehicle Systems Optimization Program (DOE, their fuel efficiency.
From page 72...
... The results get Progress Toward Objectives close to the Technology Roadmap target of a drag coefficient of 0.5, even though the tractor itself is not as streamlined as As reported by McCallen, devices have been identified a number of currently available tractors. that will reduce drag to the target levels. A reading of the Another project carried out under the Heavy Vehicle reports and related information as cited in the background Aerodynamic Drag Program is quite distinct and has been section indicates that methods and devices capable of achievan active project for almost the entire period from the initial ing the target levels were already available as the MYPP was MYPP.
From page 73...
... This strategy demonstrated the potential Engine Accessories to provide an additional 5 to 7 percent yearly fuel savings. A more detailed discussion concerning idle-­reduction tech The parasitic losses associated with auxiliary loads nologies and programs conducted under the 21CTP program are approximately 20 hp for a typical heavy-duty vehicle are included in Chapter 6 of this report.
From page 74...
... Given the potential of this program • Determine Erosive Effects of Nanofluids for High to save fuel, the committee recommends that the 21CTP Efficiency Radiator Systems continue the R&D of the identified system components that -- Analyzed and developed predictive models for will provide additional improvements in idle reduction and erosion of radiator systems caused by the use of parasitic losses related to engine components that are more nanofluids efficient and provide better control of energy use.  The -- Measured baseline data on erosion of aluminum program should focus also on the cost-effectiveness of the radiator systems due to use of Cu-based nanofluid technologies. -- Evaluated tribological effects of nanofluids Finding and Recommendation 5-1 are identical to Finding and Recom mendation 6-7 (in Chapter 6, "Engine Idle Reduction")
From page 75...
... vehicle weight reduction opportunities through the applications of lightweight materials, including high strength steels, aluminum, and advanced composites. Previous Progress Toward Objectives demonstration programs have shown the potential to reduce Numerous separate projects were initiated to support the weight of light vehicles by over 20 percent using high the program, spanning the application of steel, aluminum, strength steels, and by as much as 50 percent using carbon titanium, magnesium, and glass and carbon reinforced reinforced composites (NRC, 2000b)
From page 76...
... Of course, it is appropriate that the truck manufacturers, rather than the federal government, be Recommendation 5-2. The committee agrees with the deciresponsible for both full system integration and production sion to terminate lightweight materials research in order to implementation; nevertheless it would have been instructive provide as much budget resource as possible to continue to have had a preliminary analysis of the net weight reduc- research in engine efficiency and emissions reduction techtion of a heavy truck due to the integrated application of nologies, as improvements in engine efficiency offer greater the individual component projects (as was attempted for the potential for overall gains in vehicle fuel efficiency.
From page 77...
... . "Track and laboratory tests met or exceeded goals, validation These demands for improved thermal management sys- test is underway." Unfortunately, a description of the track tems have created a need for new and innovative thermal and laboratory tests that had been performed, the engineering management technologies that will require long-term R&D.
From page 78...
... • Integration of component designs with advanced mate rials, engineered surfaces, and lubricants into complete GOAL 4B: THERMAL MANAGEMENT and FRICTION systems is poor. AND WEAR -- DEVELOP AND DEMONSTRATE TECHNOLOGIES THAT REDUCE POWERTRAIN AND The following major topics addressing both short-term and DRIVELINE LOSSES BY 50 PERCENT, THEREBY long-term friction, wear, and lubrication technologies were IMPROVING CLASS 8 FUEL EFFICIENCIES BY 6 TO 8 identified by DOE and industry for improving fuel economy, PERCENT while maintaining system durability and reliability: The background and approach for Goal 4B were also described in the 21CTP Roadmap and Technical White • Integration of mechanistic friction and wear models Papers (DOE, 2006a)
From page 79...
... While the problems dealing with friction and wear inside the engine can be addressed by engine manufacturers asso The committee was not provided with the detailed ciated with the 21CTP, the issues associated with the other approach and plans to achieve a 50 percent reduction in driveline devices must be handled by other suppliers that parasitic losses in the powertrain and driveline, which are not currently participants in the 21CTP. Here again, the would yield a 6 to 8 percent improvement in fuel efficiency.
From page 80...
... .) Compromising Cost Or Performance Background Suggestions for Government Initiatives Rolling resistance of tires is one of the parasitic losses In the highly competitive tire market, the technology acting on trucks that increase fuel consumption.
From page 81...
... 2006. FY 2006 Annual Progress Report for Heavy Vehicle buyers considered UTQGS information important in Systems Optimization Program, Section I


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