Question

When the fuel is burned and the water appears in the vapour phase, the heating value of fuel is called?

Answer 1

Higher calorific value or gross calorific value

Explanation:

• Gross heating value accounts for water within the exhaust leaving as vapor, and includes liquid water within the fuel before combustion. This value is vital for fuels like wood and coal, which is able to usually contain some amount of water before to burning.
• The lower heating value also referred to as net calorific value of a fuel is defined because the amount of warmth released by combusting a specified quantity initially at 25°C and returning the temperature of the combustion products to 150°C, which assumes the heat of transformation of vaporization of water within the reaction products isn't recovered.
• The higher heating value also known gross calorific value or gross energy of a fuel is defined because the amount of warmth released by a specified quantity initially at 25°C once it's combusted and therefore the products have returned to a temperature of 25°C, which takes under consideration the heat of vaporization of water within the combustion products.

Answer 2

Answer: The heating value of fuel is referred to as Gross Calorific Value or High Heating Value when it is burnt and water occurs in the vapour phase.

To have a better understanding, let us talk about calorific value and fuel calorific value.

Explanation:

What exactly is Calorific value?

The calorific value of a material is the amount of heat created as a result of full combustion of a unit volume of the substance.

It is also known as the high heating value or gross calorific value (GCV). Furthermore, a substance's calorific value (typically, solid biofuel or food) is the specific energy of burning per unit mass.

The calorific value is measured in KJ/kg in the International System of Units.

What is the Calorific value of fuel?

When we burn

• coal
• petroleum
• diesel
• kerosene

or any other flammable gas, we may generate electricity in thermal power plants. So, the optimum fuel to create electricity is decided by its quality, which is determined by a fuel's calorific value.

The unit is determined by the kind of fuel; for example, coal is a solid fuel, thus it is measured in weight units, but we use volume units for any gaseous or liquid fuel.

As a result, their calorific value will be expressed in kilocalories per kilogram (Kcal/kg) and kilocalories per litre (Kcal/L), respectively.

Hope, the concept is clear.