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Dulongs formula for GCV calculation

If we know the ultimate analysis of fuel, we can easily calculate its GCV.The basic principle is that there are only 3 components in a fuel which generate heat. These are:Carbon, Hydrogen and Sulphur.According to Dulong's formula gross calorific value of a fuel is;GCV = ((35.5 x C + 114.8 x H + 9.5 x S – 14.5 x O) x 1000) / (100 x 4.1868)Each multiple of carbon, hydrogen and sulphur represents heat generated by its one mole.The formula gives GCV in kcal/kg. Simple isnt it !

## 4 comments:

how about the net calorific value? Is there a formula to on how to get its value? If none, how do we calculate it?

Hi

Sorry for the late reply..

The difference is in the heat produced by water vapour (produced by combusion) when it condenses.

Net calorific value can generally is lesser than GCV by around 10%.

Hope it helps...

Net calorific value(NCV)=GCV-(9*H%*587)

Thanks Pratiksha

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