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A simulation's absolute prediction of consumption is less reliable than its comparisons because it depends on

  • A.assumed occupancy, schedules and weather
  • B.the geometry of the building, which is uncertain
  • C.the conductivity of the materials, which is unknown
  • D.the accuracy of the simulation engine's mathematics

Answer: A

Real occupants keep different hours and different set points from any assumption, and the weather file is a past average. The same assumptions applied to two options make the difference between them far more trustworthy than either absolute figure.

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