During a post weld heat treatment (PWHT) operation, a section of pipe with outside diameter (OD) of 50 cm is wrapped by heaters (dashed line in the picture below) providing a heat flux of 5000 W/m, and then the heaters are insulated with a 2 cm-thick layer of fiberglass (k = 0.2 W/mK, depicted in yellow). Assuming the heat transfer to the ambient is by natural convection, and that ambient air is at 15 C, determine: a) Temperature of the OD of the insulation, at the 12 o'clock position (top) b) Temperature of the OD of the insulation, at the 6 o'clock position (bottom) Hints: Neglect the thickness of the heaters Neglect any heat transfer to the ID of the pipe You can assume the top half of the pipe as a hot surface facing up, and the bottom half as a hot surface facing down 50 cm