Energy Balance to check SURF Parameter NET_HEAT_FLUX

[phart1]

I would appreciate a comment/opinion on the application and approach below.

I am modeling a 250W heat lamp using a GEOM. I determined the surface area of all the faces on the front face, emitting portion of the lamp and then applied a NET_HEAT_FLUX to those faces based on 250W.

In an effort to verify I was getting the expected amount of energy from the lamp I placed it in front of a wall (similar to the ht3d_energy_conservation test case). I set SOLID_PHASE_ONLY=T and obtained the net WALL_ENTHALPY using a surface integral in the direction of interest. The enthalpy change is very close to that expected. Expected = 250W x 100s=25kW. Actual = 24 kW.

The difference I believe is attributed to the faces that are at the edges where the bulb's surfaces curves that the faces have a limited line of site to the wall.

Thanks

[phart1]

25 kJ vs 24 kJ

[rmcdermo]

Does the result change with change in grid or angular resolution or setting up radiation solver to solve complete RTE once per time step?