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2. An adobe thermal storage wall is 15 ft by 8 ft by 12 inch thick. It is located inside a south-facing window. Its average temperature at 8 a.m. is 60 degree F. If it warms up to 100 degree F by 4 PM, how much heat has it stored? The specific heat and density of adobe are 0.24 Btu/lb F and 106 lb/cu.ft respectively. (5 points)

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Heat staraf 159 = }22112 Btu

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