1. The problem statement, all variables and given/known data You would like to put a solar hot wate system on your roof, but you'r not sure it's feasible. A reference book on solar energy shows that the ground-level solar intensity in your city is 850 W/m2 for at least 5 hours a day throughout most of the year. Assuming that a completely black collector plate loses enerty only by radiation, and that the air temp is 20 degrees celcius, what is the equilibrium temp of a collector plate directly facing the sun? 2. Relevant equations Q/delta t= e sigma AT4 sigma= 5.67*10^-8 3. The attempt at a solution So I tried to change the W/m2 into just W by multiplying by the area but i couldn't figure out the area. I think this is my biggest problem. I think once i find out how to find out the area i can plug it into the equation above and solve for T. Would this be the correct path?