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Heat flow per area per time = (delta T) / R delta T = difference in temperature between the two sides of the wall area = area of the wall or part of the wall under consideration 'R' = "R"-value of the construction materials and/or insulation that makes up the wall. Intreresting how it's the direct analog of Ohm's Law for electrical voltage (delta T), current (heat flow per time), and resistance ('R').

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Q: What is the formula for heat flow per unit time through a single layer wall?
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