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None of the following is a loss head in the indirect method except

  • A.the electrical consumption of the induced draught fan
  • B.the cost of the feedwater treatment chemicals
  • C.the depreciation of the boiler plant
  • D.the loss due to moisture in the combustion air

Answer: D

Air always carries some water vapour, which is heated and discharged, and it appears as a small loss head of a few tenths of a per cent. Fan power, chemicals and depreciation are all outside the thermal boundary of the calculation.

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