GROSS CALORIFIC VALUE | NET CALORIFIC VALUE |
Amount of heat when a unit quantity of fuel is completely burnt and the products of combustion cooled to normal temperature. | Amount of heat when a unit quantity of fuel is completely burnt and the products of combustion leaves simultaneously. |
It is also known as higher calorific value. | It is also known as lower calorific value. |
Total energy can also be released when products have cooled to room temperature. | Total energy is released when products are hot. |
The heat in byproducts can be recovered through condensation. | The heat in byproducts escapes in the surroundings. |