This Demonstration shows how a radiation shield affects radiative heat transfer to a ball. The ball, in the center of an enclosure, is the object that is shielded; you can remove the shield by unchecking "shield". The enclosure around the shield and ball is assumed to be a black body at a temperature of 600 K. The radiation shield diameter is 0.2 m larger than the ball diameter, and the shield is thin enough that conductive heat transfer can be ignored. Use buttons to view a radiation network or a plot of the radiative heat transfer from the enclosure to the ball as a function of the emissivity of the shield. The plot is available only when "shield" is checked and a 3D physical representation of the ball and shield is shown on the plot.