Quote:
Originally Posted by planetaire
Hi, Julian
It is interesting to compare the vw Up and the e-Up.
First is thermal model, cd 0.32, the second is electric model, Cd 0.308
Vw use exactly the same body for this economical car. They don't add aerodynamic devices. They could have add underbody panel between front and rear wheels, but they don't.
In the electric model they put the battery cells under the front and rear seats. They close the center tunnel that is used for wires and electronic (bms...)
They also permanently partially close the front grill. It is an economical car so they don't add front mobile shutter.
The parts closed are on this picture:
So the difference between this two Cd values are only dues to cooling differences. For the thermal model mainly for the engine and exhaust pipe, for the electric model motor and electronic. |
Sorry, but again I can't see the relevance to the discussion. If they make underfloor changes to the electric version (as you say they do) then obviously the Cd of that version will be lower, and so it doesn't tell us what proportion of total drag is made up by the EV cooling system on the EV car. This can only be found out by testing the cooling drag of each version and telling us what it is.
Quote:
At the "opposite", MB is launching their EBS electric car. Cd goes down to 0.20. It is optimise only for electric, no thermal model.
It is much much more expensive, so they have add a mobile front shutter.
And they said:
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Nearly all modern prestige cars use cooling shutters - BEV or ICE or Hybrid. It's nothing to do with the car being a BEV.