Hi, I need help tackling this problem and I wanted help since I feel lost. I have a probe running through a belt-furnace that has multiple stages for heating, I know the temperature of the oven at any given time (in minutes), the oven takes 8 hours and the Temperature profile looks like this: http://img844.imageshack.us/img844/9382/capturexyg.png [Broken] http://img844.imageshack.us/img844/9382/capturexyg.png [Broken] I have to make a probe that can withstand that amount of heat, the part where I get lost is that I dont know how (or what) to calculate? like if I want to get the Heat transfer from the oven to the probe how do I do that? (to see if it will melt) I know it should be Q= Qconduction + Qradiation (I am assuming conduction instead of convection, since the probe will be moving very slowly and therefore can treat the air as still) I know the surface temperature of the probe as it enters (room temperature). should I get over 400 Q's and add them up? (I can use excel) or should I get some average temperature? and get Q based on that? If I use Qconduction = k T1-T2/x what is T1 and T2? (I can assume they are the surface temperature and furnace temperature, but this will be changing over time), and what about x? is it the distance from where to where? I mean the whole furnace is at whatever temperature, so how do I find the heat transferred to the probe?