In another thread, a reference was made to yet an earlier thread with this pic of a diagnostic screen :
Looking at this picture, it appears that there are three thermal management loops: one for the battery (green) one for the drivetrain/charger (red), and one for the cabin HVAC (black). There are a few places where they seem to interact, such as the valve that thes the green loop in to the black loop for providing battery cooling, and the where the red and green loops both bass thru a "parallel" block for some reason.
I got to wondering about a few things, and have the following thoughts/questions for discussion:
1) Any thoughts as to what that "parallel" block does? Perhaps a valve to change the system from a parallel one to a serial operation? (the lower left corner reads "Current Mode: Parallel", hence my suspicion that it can be changed)
2) It appears that the drivetrain can generate some significant heat, with the motor having a temp reading of 162°C. If that is the case, I'd guess that putting the system in "serial" mode would allow the motor to provide battery pack heat in cold climates, helping reduce the need for the electric pack heater.
3) It appears the red drivetrain loop has it's own heat exchanger for cooling that can be switched in and out of the loop. When in "serial" mode, I'm assuming the black-loop chiller might provide additional cooling capacity.
4) I wonder if the excess drivetrain heat can also provide cabin heat? As the "normal" cabin heating is done via electric heaters, they appear not to be represented here. I'm assuming that the black HVAC loop is NOT representing Freon (otherwise the valve in to the green battery loop doesn't make sense), so perhaps the heat from the pack can provide cabin heat...
5) Are the charger(s) thermal managed with coolant? I'm assuming that "Heatsink" value to the left of Charger 1 is a passive device for the charger(s). Any ideas what "Magnetic" there means?
6) The "whistle shaped" symbols are pumps. What are the "bow-tie shaped" symbols below the HVAC heat exchangers? Louvers?
Any thoughts appreciated...
Looking at this picture, it appears that there are three thermal management loops: one for the battery (green) one for the drivetrain/charger (red), and one for the cabin HVAC (black). There are a few places where they seem to interact, such as the valve that thes the green loop in to the black loop for providing battery cooling, and the where the red and green loops both bass thru a "parallel" block for some reason.
I got to wondering about a few things, and have the following thoughts/questions for discussion:
1) Any thoughts as to what that "parallel" block does? Perhaps a valve to change the system from a parallel one to a serial operation? (the lower left corner reads "Current Mode: Parallel", hence my suspicion that it can be changed)
2) It appears that the drivetrain can generate some significant heat, with the motor having a temp reading of 162°C. If that is the case, I'd guess that putting the system in "serial" mode would allow the motor to provide battery pack heat in cold climates, helping reduce the need for the electric pack heater.
3) It appears the red drivetrain loop has it's own heat exchanger for cooling that can be switched in and out of the loop. When in "serial" mode, I'm assuming the black-loop chiller might provide additional cooling capacity.
4) I wonder if the excess drivetrain heat can also provide cabin heat? As the "normal" cabin heating is done via electric heaters, they appear not to be represented here. I'm assuming that the black HVAC loop is NOT representing Freon (otherwise the valve in to the green battery loop doesn't make sense), so perhaps the heat from the pack can provide cabin heat...
5) Are the charger(s) thermal managed with coolant? I'm assuming that "Heatsink" value to the left of Charger 1 is a passive device for the charger(s). Any ideas what "Magnetic" there means?
6) The "whistle shaped" symbols are pumps. What are the "bow-tie shaped" symbols below the HVAC heat exchangers? Louvers?
Any thoughts appreciated...