A wall of a house is made of 0.2 m layer of brick followed by 0.05 m of plaster. Calculate the thickness of wool insulation that should be added in order to reduce the heat transfer through the wall by 60%? Thermal conductivity of brick = 0.68 W/m.K Thermal conductivity of plaster = 0.5 W/m.K Thermal conductivity of wool = 0.06 W/m.K

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