# Is it possible to find heat flux without emissivity value?

In this question there is a value given for absorptivity of infrared radiation however in order to work out a value for heat flux emitted from the solar panel in order to answer part (a) surely I'd need a value of emissivity? I have been stuck on this and have no clue how to work part (a) out without a value for emissivity.

You don't get the the emissivity coefficient because it is already factored in the problem. You have a constant temperature of $$71[^oC]$$ on the external surface, and this is explicitly stated as a steady state problem.