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The U-value of a construction is

  • A.the reciprocal of the sum of its thermal resistances
  • B.the sum of the thermal resistances of its layers
  • C.the thermal conductivity of its thickest layer
  • D.the product of its area and its temperature difference

Answer: A

Each layer contributes a resistance equal to its thickness over its conductivity, the surface films add two more, and the reciprocal of the total is the transmittance. A lower value means a better insulated construction.

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