Heat source, Surface or volume

Hi all,
I tried to induce a heat flux of q=29.7W/m^2, or Q=13W onto a aluminium base.
I used 2 methods; the surface source and the volume source.
However, the temperature indication on the base was the same as the ambient temperature that I have preset the reference to 293.2K. Theoretically, the base would have increase in temperature. For the volume, I have reinsert a body for implementation of the volume source. both to no avail. Help needed here. Thanks.
Regards,