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Engineering, 28.10.2020 16:40 719729

A series composite wall of a furnace consists of 20 cm of fire brick (thermal conductivity 1.4 W/m-K), 10 cm of insulating material (0.22 W/m-K), 10 cm of ordinary brick (0.90 W/m-K), and 10 cm of asbestos cement board (0.39 W/m-K). The inside of the furnace wall is 560C and temperature of the outside wall is 80C. The heat transfer rate through the wall per area is most nearly:

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