Question: A 6-in. nominal diameter (OD = 6.625 in.) pipe carrying vaporized heat transfer fluid at 750°F is covered with a 1.5-in. layer of high temperature insulation @c = 0.09 Btu/(h ft OF+)] inside a 2-in. layer of 85% magnesia F = 0.038 Btu/(h ft OF)].
If the outside surface of the outer layer has a temperature of 70°F, find
(a) the heat loss in Btu/h per linear foot of pipe, and
(b) the temperature at the interface between the two insulating layers.
what assumptions are inherent in your model?