| HCV |
LCV |
| Also known as higher heating value (HHV) or gross calorific value |
Also known as lower heating value (LHV) or net calorific value |
| Byproducts are allowed to condense |
Byproducts are allowed to escape |
| Amount of heat evolved when a unit weight (or volume in the case of gaseous fuels) of the fuel is completely burnt and the products of combustion cooled to the normal conditions (with water vapor condened as a result). |
Amount of heat evolved when a unit weight (or volume in the case of gaseous fuels) of the fuel is completely burnt and water vapor leaves with the combustion products without being condensed. |
| Total energy released when products have cooled down to the room temperature and water has been condensed out. |
Energy released when products are hot. |
| Some of the heat or energy in byproducts can be recovered through condensation. |
Heat or energy in byproducts escapes the system. |
| HCV are High value. |
LCV are Low value. |
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