1. The problem statement, all variables and given/known data The underside of a smoky layer 7m x 10m is radiating like a flat, isotropic plate at 440°C to the floor of a compartment 1.85m below. The mean emissivity is 0.45 and the floor is homogenous/flat plate at 40°C. What is the rate of heat transfer from the smoky layer to the floor? 2. Relevant equations 3. The attempt at a solution Really don't know where to start from.