When insulating a steam pipe with two layers of materials having different thermal conductivities, how should the layers be arranged to minimize heat loss?

Explanation

To achieve the least heat transfer, the insulation with the lower thermal conductivity (better insulator) should be installed directly adjacent to the pipe. This arrangement reduces heat flow more effectively than placing the better insulator on the outside or randomly. Considering steam temperature is important for material selection but does not dictate the layering order for minimizing heat loss.