I want to verify TABLE 6.8.2B Minimum Duct Insulation considering the thermal resistance of a cylindrical wall, which is determined according to the logarithmic equation you can see at the end of this wikipedia page:


According to that equation thermal resistance is in K/W, but TABLE 6.8.2B provides values in m2*K/W.

Shall I multiply for the exteral area of the pipe, including the insulation, in order to have a vaule that is comparable with the values provided by TABLE 6.8.2B?

Best Regards