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The gross or higher calorific value of a fuel is the heat released when the products of combustion are cooled to

  • A.ambient temperature, condensing the water formed
  • B.the temperature of the flame itself
  • C.ambient temperature with the water left as vapour
  • D.the boiling point of water at atmospheric pressure

Answer: A

Condensing the steam recovers its latent heat and so gives the larger figure, which is what a bomb calorimeter measures. The net value leaves the water as vapour and is the figure relevant to a boiler whose flue gas leaves hot.

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