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Cooling drag
PhD Joseph Katz shared some helpful numbers in 2017.
For his 'generic' automobile of Cd 0.355:
* ' cooling drag' was 0.024.
* 'engine bay' drag was 0.048.
* or, 0.072 combined!
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This would partially explain a BEV's drag advantage, as it can have an essentially 'ideal' belly pan, compared to an ICE variant of the same model.
* Underbody & Chassis is 0.085 for ICE.
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General Motors pubished Cd 0.36 for the SPARK ICE, and Cd 0.325 for SPARK EV.
Delta- 35-counts.
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The Coventry University Audi A2 measured:
* belly pan = 16.2-counts
* grille-block = 27.3-counts
* under wheel arch seal = 3.6-counts
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Chevrolet Division published for their 2013 Malibu:
* lower grille shutters = 7-counts
* closed upper grille = 7-counts
* center outboard belly pan = 10-counts
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The 2013 Dodge Dart radiator shutters were good for 0.005.
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Ford published that their 1st-gen Fusion cooling system carried a 0.025 penalty.
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100% grille-block on Spirit meant a delta- 0.027.
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I believe that Adrian Gaylard mentioned a Land Rover with a 0.048 cooling system.
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Hucho spoke of 2% drag cooling systems.
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The circa 2012 IVECO Class-8 ' Glider' Tractor has a non-aspirated cooling system, using bat-wing, heat-dissipating gap-filler panels behind the cab. ) My new Energy Star refrigerator uses this technology.
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There are other random numbers published. I don't have all that organized.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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