Quote:
Originally Posted by JulianEdgar
I don't now where you're getting your data from, but I am quite certain it was never measured to five decimal places...
Round them, divide by total car Cd, then multiply by 100.
As I have been saying, the percentage cooling drag of BEVs (at least for cars on which we have data) is not low at all.
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* The Tesla data is from you.
* The Ford/Buckeye, Fusion 999 data is from FoMoCo.
* You also gave us Hucho's 0.025 cooling, on an estimated Cd 0.40 car of 1981.
* Your Joseph Katz gave us 13.5% for a generic Cd 0.355 vehicle in 2017.
* The 1999 Audi A2 is 10.27%.
* Gary Eaker has personally measured cooling drag from 0.05, to 0.100
* The 1963 Corvette Stingray was 12%.
* Ford of Cologne's 'Lamellar' grille was good for delta-12%.
* The 1936 Adler-Jaray was 15.78%.
* 2016 Jaguar XJ Supercharged 8.62%, from you.
* 2016 Land Rover Range Rover, 10.29%.from you and me.
* 2004 Jaguar, Cd 0.30, 125-mph car, 15.66%. from you.
* 2008 Ford of Australia, Falcon sedan, 8.0%. from you.
* 2008 Ford of Australia, Falcon wagon, 13.48%. from you.
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1) The two examples given are for a 160-mph car, and a 155-mph car.
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2) The only valid scientific comparison we could make, would be for cars of identical CdA and Rolling-Resistance at 160-mph and 155-mph.
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3) Considering Vekke's 2021 VW ID3 of top-speed= 99.4-mph, operating the same car at 155-mph would require the aero load portion of the radiator area to be increased by a factor of 379%.
4-a) At 160-mph, the radiator's aero portion area would have to increase by 417%.
4-b) The Rolling-Resistance portions would only have to increase arithmetically, assuming zero-standing wave.
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5) You haven't mentioned that 1/3rd of an ICE engine's waste heat is lost through the exhaust system!
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6) You haven't mentioned that, in the 'AGE of Thermal Management', that thermal loads may be separated out to dedicated systems for:
a) Radiator
b) transmission
c) oil
d) intercoolers
e) differential
f) brakes
g) electronics
h) climate control
i) tire cooling
j) solar insolation
k) thermal conduction
l) thermal radiation
m) electronic noise cancellation
n) electronic noise introduction
o) 'Track-Mode'
p) 'Super' Mode
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* Even at the time of Hucho's December, 1986 publication, there were 'passenger' cars with top speeds which exceeded 'racing' cars.
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If we're going to compare cooling systems, we need a single variable to do it.
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