tjsean0308 wrote: ↑
Mon Jan 13, 2020 4:10 pm
The BEV does have a heat pump, which generally are more efficient in cooling. I haven't had my car in desert heat, but 100 degrees in the midwest was not a problem with the heat pump. It easily condensates the outside of the windows.
That's not quite right with respect to the heat pump.
The battery will always produce heat that needs to be stripped away (or "managed," I guess one could say), but will never produce cold.
So the system pumps coolant through the battery tray to carry off the excess heat, just like the coolant system that runs through an engine block.
With the heat pump, the i3 system resembles an ICE car where that heat is then exchanged with the interior system and warms the cabin air, but doesn't cool it. Without this option, that stripped-away heat is shed via a radiator to the outside airflow and "lost."
When the car and battery are parked and cool, this same system will use resistive heating to warm the "coolant" (which instantly becomes an inappropriate name), to bring the battery up to a friendlier operating temperature. But even though this is the reverse of what's described above, it doesn't exchange any cool air with the cabin -- particularly because if the battery is cold and needs to be heated, so too does the cabin.
Put another way, the only thing that cools an i3 interior is the battery-driven AC compressor, and it's identical on BEV and REX.