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Another issue is that water cooling might not be the ideal solution for BEVs as it relies on having a significant deltaT.
One system that might work more efficiently would be to cool the drivetrain directly with a phase change cooling system that can operate as a liquid cooling system as well by using additional reservoirs as well as a bypassable expansion valve and a controllable pump.
Nice side effect:
One could reverse the pump to heat the battery/interior during winter.
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