.TRANSFORM.HeatAndMassTransfer.Examples.ExamplesFrom_NellisAndKlein.Example_1_8_1_PipeInARoof.part_a_UseExtendedSurface .TRANSFORM.HeatAndMassTransfer.Examples.ExamplesFrom_NellisAndKlein.Example_1_8_1_PipeInARoof.part_a_UseExtendedSurfacepart a) Determine if it appropriate to use an extended surface