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The gross calorific value of a fuel exceeds the net value by

  • A.the energy needed to raise the fuel to its ignition temperature
  • B.the heat carried away by the excess air
  • C.the unburnt carbon left in the ash
  • D.the latent heat of the water vapour in the products

Answer: D

Gross assumes the water formed by combustion is condensed and its latent heat recovered, which an ordinary flue does not do. Quoting an efficiency against one value and a fuel price against the other is a common and material error.

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