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Comparing an energy balance drawn round a single furnace with one drawn round the whole site, the furnace balance

  • A.requires no production data at all
  • B.cannot be closed without site-wide metering
  • C.localises the loss but may miss what happens downstream
  • D.is always the more accurate of the two

Answer: C

A tight boundary makes each stream measurable and the loss attributable, which is exactly what a targeted audit wants. It says nothing about the heat that leaves in the product and is then wasted elsewhere, which only the wider boundary reveals.

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