A steam pipe (k= 45 W/m-°C) having 70 mm inside diameter and 85 mm outside diameter is lagged with two insulation layers; the layer in contact with pipe is 35 mm asbestos (k = 0.15 W/m-°C) and is covered with 25 mm thick magnesia insulation (k = 0.075 W/m-°C). The heat transfer coefficients for the outside and inside surfaces are 220 W/m?.°C and 6.5 W/m?C respectively. Temperature of the steam is 350°C and the outside atmosphere is at 30°C. (a) Sketch the schematic diagram of the system in question showing all necessary details and given data. (b) Determine the steady loss of heat for 50 m length of pipe. (c) Find out the overall heat transfer coefficients based on inside and outside surfaces of the lagged steam pipe.

A steam pipe (k= 45 W/m-°C) having 70 mm inside diameter and 85 mm outside diameter is lagged with two insulation layers; the layer in contact with pipe is 35 mm asbestos (k = 0.15 W/m-°C) and is covered with 25 mm thick magnesia insulation (k = 0.075 W/m-°C). The heat transfer coefficients for the outside and inside surfaces are 220 W/m?.°C and 6.5 W/m?C respectively. Temperature of the steam is 350°C and the outside atmosphere is at 30°C. (a) Sketch the schematic diagram of the system in question showing all necessary details and given data. (b) Determine the steady loss of heat for 50 m length of pipe. (c) Find out the overall heat transfer coefficients based on inside and outside surfaces of the lagged steam pipe.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A steel pipe with heat transfer coefficient of 42 W/mK contains flowing water. The outer diameter of the pipe is 90 mm and the wall thickness is 3mm. Calculate: i. The heat loss by convection and conduction per meter length of un-insulated pipe when the water temperature is 14°C, the outside air temperature is -10°C, the water side heat transfer coefficient is 30 KW/m^2K and the outside heat transfer coefficient is 20 KW/m^2K. ii. Calculate the corresponding heat loss when the pipe is lagged with insulation having an outer diameter of 200 mm, and thermal conductivity of K = 0.05 W/mK