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Which formula is used to determine higher calorific value of fuel?

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Which formula is used to determine higher calorific value of fuel?

(a) Rayleigh’s formula

(b) Lamme’s equation

(c) Dulongs’s formula

(d) Cauchy’s formula

I have been asked this question in an online quiz.

The query is from Calorific Value of Fuels in chapter Steam Power Plant of Energy Engineering

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The correct option is (c) Dulongs’s formula

To explain I would say: Higher calorific value of the fuel can be determined by using Dulongs’s formula. Let C, H, O and S represent the percentage by weight of carbon, carbon, oxygen and sulfur respectively.

                                                     HCV = 1/100 [33900 + 144000(H – (O/8)) + 9295 S] kJ/Kg

 This formula gives gross heating value in terms of the weight fractions of carbon, hydrogen, oxygen and sulfur from the ultimate analysis.

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