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The boundary of an energy balance must be

  • A.drawn round one item of plant in every case
  • B.chosen so that no losses cross it
  • C.defined explicitly before any stream is counted
  • D.drawn round the whole site in every case

Answer: C

Whether the boundary is a furnace, a department or the site decides which streams are inputs, which are outputs and which are internal, and a stream counted twice or not at all follows from leaving it vague. Losses necessarily cross it, which is the point.

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