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The surface temperature of 200 ft of 8-inch diameter un-insulated pipe carrying steam at 335 F...

The surface temperature of 200 ft of 8-inch diameter un-insulated pipe carrying steam at 335 F is 250 F. The pipe is located in a room with air and surroundings at 50 F. The surface emissivity of the pipe is 0.70. Calculate convection, radiation and total heat loss from the pipe (Btu/hr). The pipe is insulated with 3 inches on insulation with thermal resistance R = 2 hr-ft2-F/Btu per inch. The surface emissivity of the insulation is 0.70. Calculate convection, radiation and total heat loss from the insulated pipe (Btu/hr). Calculate the heat loss and fuel savings from insulating the pipe (Btu/hr) if the efficiency of the steam system is 65%.

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