Consider a plane composite wall that is made of two materials of thermal conductivities ka = 205 W/m·K and kb = 46 W/m·K and thicknesses δa = 5 cm and δb = 2.5 cm. Material a adjoins a hot fluid at 150o for which ha = 12 W/m2 ·K and material b is in contact with a cold fluid at 30o for which hb = 23 W/m2 ·K. The wall is 2 m high and 2.5 m wide.Calculate the rate of heat transfer through the wall.Calculate the overall heat transfer coefficient if the interface between the two walls has a thermal contact resistance of 8.5 × 10-3 m2 ·K/W.

Thermal conductivities of two materials,ka=205 W/mKkb=46 W/mKThicknesses,δa=5 cm=0.05 mδb=2.5…

Answered: Consider a plane composite wall that is…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Consider a plane composite wall that is made of two materials of thermal conductivities ka = 205 W/m·K and kb = 46 W/m·K and thicknesses δa = 5 cm and δb = 2.5 cm. Material a adjoins a hot fluid at 150o for which ha = 12 W/m2 ·K and material b is in contact with a cold fluid at 30o for which hb = 23 W/m2 ·K. The wall is 2 m high and 2.5 m wide.
Calculate the rate of heat transfer through the wall.
Calculate the overall heat transfer coefficient if the interface between the two walls has a thermal contact resistance of 8.5 × 10-3 m2 ·K/W.

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