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Calculate the reduction in heat transfer across a multi-layer cavity wall (U=1.6 W/m2 .C) when the air cavity (90 mm) is filled with an insulation

Calculate the reduction in heat transfer across a multi-layer cavity wall (U=1.6 W/m2 .C) when the air cavity (90 mm) is filled with an insulation material (K=.035 W/m.K) and indoor and outdoor temperatures are at 23o C and 41o C respectively. (given: The cavity conductance= 6.8 W/m2 .C.)

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