Discussion
The gross calorific value of a fuel differs from the net value in that it
Answer: A
Correct answer: counts the latent heat of the water formed
The gross value assumes the water vapour produced is condensed and its latent heat recovered; the net value assumes it leaves as vapour. The difference is substantial for a hydrogen-rich fuel - several per cent for coal and around ten for natural gas - so an efficiency is meaningless unless the basis is stated. Conventional boilers exhaust above the dew point and are quoted on the net value; condensing boilers recover that heat and can exceed 100 per cent on it.
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