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The direct method of finding boiler efficiency compares

  • A.the heat in the steam with the heat in the fuel
  • B.the sum of the measured losses with the fuel input
  • C.the flue gas temperature with the ambient temperature
  • D.the feedwater flow with the fuel flow

Answer: A

It needs only the steam and fuel quantities and their enthalpies, which makes it quick, but it says nothing about where the missing energy went. The indirect method accounts for each loss separately and so points at what to fix.

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