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(a) Calculate the R value for a wall consisting of the following layers: concrete block (R = 1.93), 1.0 inch of insulating board (R = 4.3), and 0.50 inch of drywall (R = 0.45), all in U.S. Customary Units. (b) If the wall has an area of 15 m2, find the heat flow per hour through it when the temperature just outside is 20 °C lower than inside. |
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