3. Consider a plane composite wall that is made of two materials of thermal conductivities ka = 205 W/m-K and k, = 46 W/m-K and thicknesses 8₂ = 5 cm and 8=2.5 cm. Material a adjoins a hot fluid at 150° for which ha = 12 W/m²-K and material bis in contact with a cold fluid at 30° for which hb = 23 W/m²-K. The wall is 2 m high and 2.5 m wide. i. Calculate the rate of heat transfer through the wall. ii. Calculate the overall heat transfer coefficient if the interface between the two walls has a thermal contact resistance of 8.5 × 10³ m² K/W.

3. Consider a plane composite wall that is made of two materials of thermal conductivities ka = 205 W/m-K and k, = 46 W/m-K and thicknesses 8₂ = 5 cm and 8=2.5 cm. Material a adjoins a hot fluid at 150° for which ha = 12 W/m²-K and material bis in contact with a cold fluid at 30° for which hb = 23 W/m²-K. The wall is 2 m high and 2.5 m wide. i. Calculate the rate of heat transfer through the wall. ii. Calculate the overall heat transfer coefficient if the interface between the two walls has a thermal contact resistance of 8.5 × 10³ m² K/W.

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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