Question: con- 1.4 How much heat (Btus) will be stored in a 100-ft crete wall 1 ft thick if it is warmed from 65F to

con- 1.4 How much heat (Btus) will be stored in a 100-ft

con- 1.4 How much heat (Btus) will be stored in a 100-ft crete wall 1 ft thick if it is warmed from 65F to 85F by exposure to sunlight? with 1.5 What is the value of the heat in Question 1.4 compared gas at $1.00 per therm burned in a boiler at 85 per- cent efficiency? What value compares with electric at $0.10 per kWh?

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