I have followed the Stefan Boltzmann law when I performed my calculation etc but I struggle to follow the logic if two object are very far apart, especially when the inverse square law is considered. I don't see how the same amount of heat energy can be radiated to an object close to a hot surface as to an object which is far away. Stefan Boltzmann law doesn't consider distance between two objects. Having paid 4500 pounds for a course, I find it obscene that I have to resort to google to find many of the answers. I did ask my tutor if distance had any bearing on radiant heat transfer to which the answer was "no". I would love to learn about the relationship between how hot a surface has to be and its distance to people to serve as an effective radiant panel. If anyone can point me in the direction of reports of manufacturers' reports I would appreciate it. (I have looked online for over 4 weeks, although I admit to not picking up the phone)