Reply with more detail about your model. Insert images of the geometry and the boundary conditions. If you do File > Archive and create a .wbpz file (< 120 MB) you can attach that after you reply.  Someone might download your model for a close look, but the ANSYS staff are not permitted to do that, they can only go by what you post.

Do you have experimental data to compare the model with the physical system?

When you say you are "not able to accurately produce a model that takes the unit heat into effect" I'm not sure what you mean.  You can assign a heat flux to a face or a body in the model.

Are you planning to build this model in Mechanical as a Steady State Thermal model or in Fluent?  Both solvers can model this system.

Are you planning to include convective heat transfer to the surrounding air?