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Originally Posted by JulianEdgar
1. Closing off the cooling in low-power electric mode in a Prius tells us nothing relevant to this discussion (which is about BEVs), does it?
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I don't agree. I use it as a BEV on our roads. Average power is low, not because electric but because his good aero (cd=0.22). Power is not a part of the BEV definition.
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2. Cd values (or percentages of total Cd) are used for cooling systems because it is a coefficient. If we used Newtons, we'd need to specify speed. We can easily work out the force for any car for which we have speed, area and cooling drag Cd.
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You are right, newton depend upon speed, then use delta Cd. For example the Up and e-Up have 0.012 delta cd between the two cooling system.
If I compare % upon the two I could may be find that the electric model have more (I am sure not). In my opinion, what is important is that the drag is more important for the thermal model, the Up.