Review of the 21st Century Truck Partnership, Second Report

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Review of the 21st Century Truck Partnership, Second Report (2012)
Board on Energy and Environmental Systems (BEES)

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Committee to Review the 21st Century Truck Partnership, Phase 2, National Research Council. "Appendix G: History of Heavy-Duty Truck Aerodynamic and Tire Rolling Resistance Coefficients." Review of the 21st Century Truck Partnership, Second Report. Washington, DC: The National Academies Press, 2012.

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Review of the 21st Century Truck Partnership, Second Report

TABLE G-1 History of Heavy-Duty Truck Aerodynamic and Tire Rolling Resistance Coefficients


		C_rr
Truck Configuration Description	C_d	Steer	Drive	Trailer	Weighted Average^a

1974 COE T-T^b	1.02				0.0103^c
1974 COE T-T, Closed Gap, Trailer Skirts, Boat-Tail^b	0.46
EPA Classic Conventional, Exterior Air Cleaners, Verticle Exhaust, Flat Bumber, No Aero Features T-T	0.77
EPA GHG Rule (CE-CERT) 2000’s Conventional High Roof T-T	0.74
EPA GHG Rule Conventional High-Roof Average T-T	0.69	0.0078	0.0082	0.0072^d	0.0077
NRC 21CTP, Phase 2, Mid-2000s Conventional High Roof, pre-S/W T-T^e	0.63				0.0068
EPA GHG Rule Conventional High-Roof SmartWay T-T	0.59	0.0059	0.0074	0.0053	0.0063
EPA GHG Rule Conventional High-Roof Advanced SmartWay T-T	0.55				0.0055
NRC 21CTP Review, Phase 2, Conventional High Roof, 2015-2020 T-T	0.45				0.0045

NOTE: COE T-T: Cab Over Engine Tractor-Trailer. T-T: Tractor-Trailer. The C_ds’ and the C_rrs’ in the table are not derived from a consistent set of measurement or test procedures.

^a Weightings: Steer (12), Drive (34), Trailer (34) reflect distribution of (80,000) lb Gross Vehicle Weight (GVW).

^b K.R. Cooper, Commercial Vehicle Aerodynamic Drag Reduction: Historical Perspective as a Guide, The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains, October 15, 2004. Springer.

^c Based on bias ply tires.

^d Assumed by National Research Council committee.

^e Reducing Heavy-Duty Long Haul Combination Truck Fuel Consumption and CO₂ Emissions, NESCCAF/ICCT, Miller ed., October, 2009; and C_d same as the DOE 2006 21st Century Truck Roadmap and Technical White Papers. Doc No. 21CTP-003, December, Washington, D.C.