Please don't beat me up too badly. I ask this in all sincerity. A very small device adds energy to a system primarily via radiation. Temperature differential is high—at least 1,500°F. The system itself is rather massive—tons. Intermediate heat transfer is via forced convection of a fluid (water) to iron. Energy output is again primarily via radiation. Temperature differential is low—say 20°F. Is it possible for any amount of the transferred energy to pass through the system without appearing as detectable temperature? If not, what law prevents this? I have a situation where this [appears] to be happening, but am at a complete loss to explain. Have lots of data from datalogging equipment and spot measurements. Numerous anomolies that are difficult if not impossible to subscribe to "experimental error". Can provide more details if needed. Thanks!