Define calorific value. Differentiate between net calorific value and gross calorific value.

Define calorific value. Differentiate between net calorific value and gross calorific value.
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1 Answer

Answer :

Calorific value of fuel 

The amount of energy produced by the complete combustion of a material or fuel. 

Measured in units of energy per amount of material, e.g. kJ/kg.

Difference between NCV and GCV

Gross Calorific Value 
Net Calorific Value
The gross heating value is obtained when all products of the combustion are cooled down to the temperature before the combustion considering the water vapor formed during combustion is condensed.
The net or lower heating value is obtained by subtracting the latent heat of vaporization of the water vapor formed by the combustion from the gross or higher heating value.
Value is higher than NCV
Value is lower than GCV
If no hydrogen is present GCV= NCV
More hydrogen is present lower is NCV.
It is not an actual heat available for use.
It is an actual heat available for use.
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