Why is net calorific value is less than gross calorific value?

Answer 1

• The lower calorific value or Net calorific value (NCV) which supposes that the products of combustion contain the water of combustion to the vapor state. The heat contained in this water is not recovered.
• The higher calorific value or Gross calorific value (GCV) which supposes that the water of combustion is entirely condensed. The heat contained in this water is recovered.

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Answer 2

when we brn the fuels containing hydrogen,it will react with the oxygen in the air and produce steam.if we condense this steam,it will release some amount of heat.this heat is called latent heat of condensation.so in addition to the normal amount of heat liberated on burning,latent heat is also added .thus there is increase in the amount of heat.this is called higher calorific value or gross calorific value..

instead of condensing the steam if we are allowing it to let it go,there will be no latent heat of condensation.so on comparing it to the gross calorific value,its amount of heat will be less.this is called lower calorific value or net calorific value..

so, L.C.V = H.C.V - Latent heat of condensation.

Answer 3

Net calorific value is less than gross calorific value because it accounts for the energy used to vaporize water in the fuel and the energy contained in the water vapor in the combustion products. This is why net calorific value considers the energy released during combustion minus the energy used to vaporize water, while gross calorific value does not account for this energy loss.