b) 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. ii. 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/m²K and the outside heat transfer coefficient is 20 KW/m²K. 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

b) 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. ii. 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/m²K and the outside heat transfer coefficient is 20 KW/m²K. 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

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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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

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b) 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.
ii.
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/m²K and the outside heat transfer coefficient
is 20 KW/m²K.
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

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