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The net calorific value is less than the gross value by the

  • A.heat carried away by the excess air
  • B.latent heat of the water formed
  • C.sensible heat of the flue gas leaving
  • D.heat lost through the furnace walls

Answer: B

Hydrogen in the fuel becomes water, and unless the flue gas is cooled below its dew point that latent heat leaves up the stack. A hydrogen-rich fuel therefore shows a larger gap between the two values than a carbon-rich one.

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