Hi, Thanks for your help. I worked for me. I changed the media to ideal gas O2, its giving me this warning,
**Warning: The function.Modelica.Fluid.Interfaces.FluidPorta$pipe1$porta.Medium.T_h.Internal.solve can return without assigning the output variables xzero.
Warning: Equation system in pump.V_flow and 14 other variables is too complex for checking conditional solvability that might be caused by if-expressions where the variable is only solvable in one of the branches**
Could you provide some suggestions on how to remove this warning as I cannot simulate my model?
Thanks