What is the calorific value: The amount of energy produced by the complete combustion of a material or fuel. Unit of Calorific Value is Joule per kg (J/kg). Calorific Value is a characteristic of fuel, based on this number, a fuel is selected for a particular application and price is also decided based on CV.
The amount of energy available from an item of food when digested, mostly from carbohydrates and fats. Any fuel that is to be used in any combustion process first, be checked by its calorific values. The cost of fuel is also affected by the calorific value of the fuel. Here you can find the basic information about the calorific value and its type.
What is combustion?
Combustion is defined as a sequence of exothermic reactions/operations which at the end gives off heat as energy and by-products of combustion products.
e.g. combustion of methane with oxygen gives water and carbon dioxide with energy.
Calorific Value of fuel: Calorific Value (C.V) or Heating Value or Energy Value is defined as the amount of energy liberated by the complete combustion of the unit quantity of fuel.
Types of Calorific Value:
1. Higher Calorific Value:
If fuel contains hydrogen as content in it and if it reacts with oxygen during the combustion process, the product of combustion also contains water vapor. If this water vapor is condensed at the temperature at which fuel and oxygen are supplied, vapor will be condensed in water form and gives off its latent energy. This is an addition to the energy liberated by unit mass fuel. Thus this is called gross or higher calorific value.
2. Lower Calorific Value:
If water vapor as a product of combustion is not condensed in water form, the net energy obtained by the complete combustion of a unit quantity of fuel is called lower calorific or net calorific value.