side diameter of 75mm and 20m long is carrying steam at 170oC. The insulation is 8 mm thick with k of 0.19 W/m-K. The insulation is painted with Black Matte Shellac. The convective heat transfer coefficients are 7,500 W/m2-K and 9.8 W/m2K for the steam and air, respectively. The surrounding
A 0.5cm thick steel pipe (k = 45 W/mK) with outside diameter of 75mm and 20m long is carrying steam at 170oC. The insulation is 8 mm thick with k of 0.19 W/m-K. The insulation is painted with Black Matte Shellac. The convective heat transfer coefficients are 7,500 W/m2-K and 9.8 W/m2K for the steam and air, respectively. The surrounding is at 23oC.
-What is the external surface area in m2 of the insulated pipe?
-What will be the overall interchange factor in considering the heat transfer by radiation of the insulated pipe to the surrounding wall?
-What will be the radiative heat transfer coefficient in W/m2K? (For this item only, use 96oC for the surface temperature of the insulated pipe.
-What will be overall heat transfer coefficient, Uo, in W/m2K? (For this item only, use 7.3 W/m2K for the radiative HTC- What is the rate of heat loss to the surroundings in kW? (For this item only, use 10.63 W/m2K for the overall HTC, Uo)
-If the heat loss is 16,350 Watts and the insulated surface temperature is 96oC, what percentage of the heat loss is due to radiation?
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