3- Calculate heat transfer flux of a wall with two layers of insulations. The inner wall is at constant temperature of 200 F°. Two insulation layers are 3 inches thick and have conductivities of 0.08 and 0.1 Btu/hr-ft-F°. Outside Temperature is 60 Fº with the heat transfer coefficient of 5 Btu/hr-ft2-F°.

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