Actually I got it to work well. But now I need to make changes as I have to add a diverter and a baffle. I struggle with how to build the model so that it simulated properly. Maybe I have missed it but a tutorial on model building would be greatly helpful to demonstrate the concepts.
On You Tube show ho someone models a heat exchanger. That has tubes within tubes, Multiple inputs and outputs, etc.
I really like your program so if we get this model finished and working we will be other than a free subscriber.
Thank you for your quick response.