Interesting information about the cooling needs of EVs I hadn’t seen before from Bugatti’s designer.
”Talking about the cooling, this is the biggest mystery to me how people can think that on an electric car, there's less cooling. Especially now, if we talk about performance electric cars. You do actually need more cooling than an internal combustion engine," he continued, then apologized for the impending use of metric measurements.
The lower temperature delta for an EV cooling system compared to an ICE is significant.
ICE - 70 degree delta
EV - 20 degree delta
”Usually, the coolant temperature of the fluids in this engine is about 90 degrees [Celsius]. That's the operating temperature; it can go up to 120—in most extreme cases, 130. So the delta to the ambient temperature outside that you stream air through—let's assume it's about 20 degrees. So 90 degrees to 20 degrees, the delta is 70 degrees, that's quite a big delta to knock off some heat energy out of the coolant," he said.
”If you have a battery, the battery has an operating window [of] 38 to 40 degrees, max," Heyl continued. "So the delta to the ambient temperature is only 20 degrees. And believe me, we already have the most efficient radiators in here. In the end, it results in having to scale up the grid, the actual net surface of the radiator. So I do not understand the discussion about "you need less air"—you need at least the same amount, if not more, to cool an electric drive train."