Net calorific value (NCV) refers to the amount of heat energy released by a substance when it is burned or otherwise combusted, minus the amount of energy required to vaporize any water produced during the combustion process. NCV is also sometimes called the lower heating value (LHV) or lower calorific value (LCV).
NCV is typically measured in units of energy per unit of mass, such as joules per gram (J/g) or calories per gram (cal/g). It is an important parameter in the study of energy and fuels, as it provides a measure of the energy content of a given material.
For example, the NCV of a fuel like coal or natural gas is an important factor in determining its suitability for various energy applications. Fuels with higher NCVs are generally more desirable, as they can provide more energy per unit of mass or volume.
Conversion for calorific values.
Here are some commonly used units and their conversion factors:
- 1 calorie (cal) = 4.184 joules (J)
- 1 kilocalorie (kcal) = 4.184 kilojoules (kJ)
- 1 British thermal unit (BTU) = 1055.06 joules (J) or 0.252 kcal
- 1 therm = 100,000 BTU
- 1 tonne of oil equivalent (toe) = 41.868 GJ
For example, if the calorific value of a fuel is given in units of kcal/kg and you want to convert it to J/kg, you would multiply by 4,184. Conversely, if the calorific value is given in J/g and you want to convert it to kcal/kg, you would divide by 4,184,000.
It’s important to use the correct conversion factors when working with calorific values to ensure accurate calculations.
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