OpenModelica Python Interface

I am new to OpenModelica. How to set value the OpenModelica variable of non Parameter type using OMPython. I am able to set the value using Python for the Parameter type: Ex.

OpenModelica Code:

parameter Real E1tf2in = 50 "Exch1Inlet Temperature Fluid 2";

Python Code:

mod.setParameters(E1tf2in = 50)

I am not able to set the value using Python

Ex:

Real E1tmetalout(start = 57.15098) "Exch1Tube Metal Temperature metal Outlet";

If I set the value it shows the error:

E1tmetalout is not a parameter.

Please help me to resolve this issue.

Thank You