DrAmine
Ansys Employee

Enthlpy of Steam should be greater than the one of the liquid. Check your material properties and if the latent heat, in case constant and not using RGP, is properly provided. I think that is correct otherwise Ansys Fluent will write a message that Latent Heat is negative.

For heat Transfer Coeffient: always correct the reference value of Tref to whatever you want to compare with.