I am modeling a coil that I want to know the surface heat flux on it. I get negative values for both surface heat flux and heat transfer rate on the solid surfaces of the coil (hot air passes through the coil). I want to know if negative values mean that the heat is absorbed by the coil and not emitted? in other words if this is true heat out of a solid body=positive and heat into a solid body=negative.
I appreciate if anyone can put comments on this