I am designing a cold plate that will have 4 Power Modules Mounted on it. The total power loss from the modules is 5000W(1250W per Power Module). I have simulated the results on ANSYS Fluent and obtained the surface temperatures.
Now I am trying to calculate (by hand) the junction temperature of the each device. [Each power module has 2 Junctions / 2 Devices]
The way I calculated the thermal resistance of the cold plate is: (Max Surface temperature - Ambient Temperature)/Total Heat Loss(5000W)
Can I use this Cold Plate thermal resistance value to calculate each junction temperature for one module? Since the heat per module is not 5000w but 1250W, I am slightly unsure of the calculation method.
Thanks for your help!
Coolant inlet Temp: 65 Degrees Celsius
Rj = 0.04 c/w
Rc = 0.002 c/w
RS = 0.009 c/w