Using average power draw and vehicle speed across an endurance race,  I wrote an optimization script which iteratively solves for the cross-sectional radiator area needed to maintain an average radiator water outlet temperature. Using this script, trends were graphed to visualize how changing vehicle parameters affect radiator cross-sectional area.

Radiator Locating

ANSYS Simulation Credit to Cooper Berggren

Radiator Sizing Endurance Simulation

Using quasi-static lap simulation data providing power draw and vehicle speed at 3000 discrete times steps, I wrote a simulation in Julia that maps the radiator water outlet temperature across a 22 lap endurance race.  Using worst-case scenario racing conditions and interpolated functions for fluid properties at these conditions, the simulation applies the NTU method for a cross-flow heat exchanger to solve for the heat generated and lost at each time step and back-solve for the temperature of the water. Then by mapping this across 22 consecutive laps, the radiator area found in the initial optimization was verified through a simulated endurance race.

Endurance Race

Motor

Inverter

Autocross Race

Motor

Inverter