I dont think how your testing the heat transfer is the right way
The whole block doesn't' get heated equally . it's get heated over 50x 200mm at the bottem then it radiates through the copper block then the water takes it away .. so we need to figure out how to sim this proccess
First of all it's not the water cooling the block it's the other way around, at least for the chiller side.
I'm just trying to simulate a time dependent calculation based on physical cooling/heating time, not cpu time or anything. Running one now and for now it seems to be working, I have a graph and everything
I'll post and example when it's done.