Has anyone played with TEC in SW flow simulation?

Currently I am doing benchmark testing on electronics cooling that uses customized TEC.

We can set DC current, Heat transfered at cold side, temperature difference and voltage at their maximum.

However, not electrical resistivity, and no input on TEC elements.

And I found that the temperature difference disagrees with empirical data.

I suspect that it's due to incomplete customization to this black box component.

Anyone facing the same problem?