A wall is composed of a 12-cm-thick layer of material a and

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Reference no: EM13638049

A wall is composed of a 12-cm-thick layer of material A and a 20-cm-thick layer of material B. The temperature of the outer surface of layer A is known to be 260 C when the outer temperature at layer B is at 30C. A layer of 2.5 cm thick insulation (k=0.09 W/(m^2C) ) is added to the outer surface of layer B. Under these conditions, it is observed that the surface temperature of layer A rises to 310C and the junction between layer B and the insulation (formerly the outer surface of layer B) becomes 220C. The insulation surface is measured to be 25C. What are the rates of heat flow, per square meter of wall area, before and after the insulation is added?

Reference no: EM13638049

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