In the case of mathematical modeling for solar dryers, with the MATLAB software and curve fitting toolbox, If there is Educational File please send. ( Or explanation ).
There is a bit problem with the definition of your problem. Could you be more specific with the type of the problem? Do you have equations or are you working with the lattice-Boltzmann model?
People would like to help you as your problem is highly ecologically interesting. You do not need to give the full specification of the problem, just to narrow the area of the used model.
When you really need curve fitting, it might be interesting to start to think about Python as it has a huge amount opensource libraries of almost everything. Machine learning is one large area where a very good library exists: SciPy. Try this one.
Let us know when you succeed. Environmentally friendly applications are great!