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Hello,
>I am using ANSYS 5.3.  I am looking for examples of thermal problems.  I
>have explored the example problem in the Help file, but the type of
>boundary conditions I wish to set do not appear in this example.
>
>Also, I am looking for descriptions of some of the fine points involved
>in the thermal modeling, such as:
>
>-- what equations are used in the thermal model?
In the most of cases (e.g. solid matherials) the Fourier-Kirchoff equation
are used.
The material parameters can be fixed, dependent on time or dependent on
temperature.

>-- how are boundary conditions set in the thermal model?
In the case of graphical interface you can select 'Load' subsubmenu from
the 'preprocessor' and 'simulation' submenu.
The b.c. can be set for specified points, lines,areas and volumes.
You can use: Dirichlet, von Neuman, contact and thin film b.c. types
In most of cases the radiation and heat generation can be used additionally.

>-- must the enthalpy for each material be defined, or is it sufficient
>to define just the specific heat, and thermal conductivity?
>  (Alternatively:  where does the enthalpy appear in the equations?)
in most of cases it is not important.to fix the enthalpy
For the solid state materials the specific heat and thermal conductivity
should be given.

Best regards,
Mariusz Zubert