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02. An exterior wall of a house consists of 10.2 cm brick an cm gypsum plaster. What thickness of loosely-packed rock insulation should he added

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02. An exterior wall of a house consists of 10.2 cm brick an cm gypsum plaster. What thickness of loosely-packed rock insulation should he added to reduce the heat transfer thro the wall by 30 per cent? The thermal conductivities of bric gypsum plaster and rockwool are 0.1 0.43 and 0.065 W.m respectively

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