An ASTM F441 chlorinated polyvinyl chloride (CPVC) tube is embedded in a vertical concrete wall (k=1.4  W / m ·K). The wall has a height of 1  m, and one surface of the wall is subjected to convection with hot air at 140^∘ C. The distance measured from the plate's surface that is exposed to the hot air to the tube surface is d=3  cm. The ASME Code for Process Piping limits the maximum use temperature for ASTM F441 CPVC tube to 93.3^∘ C (ASME B31.32014 , Table B-1). If the concrete surface that i