![]() ![]() The heat of combustion for fuels is expressed as the HHV (Higher Heating Value) or LHV (Lower Heating Value). Heat of Combustion Heating Values of Combustion Theoretically, the heat of combustion is calculated from the difference between the heats of formation (ΔH f o) of the products and the reactants under standard conditions. The heat of combustion is determined as the heat is released. The vessel and its contents are then cooled to the original 25 ☌. Hydrogen and oxygen react during combustion, producing water vapor. The reaction is then allowed to complete. A stoichiometric mixture of fuel and oxidizer is kept in a steel container at 25 ☌ and initiated by an ignition device. The heat of combustion is calculated by using a bomb calorimeter. When the amount is quantified for one mole of the substance, we call it molar heat of combustion. The heat of combustion is the heat released by a substance when it undergoes complete combustion in the presence of oxygen at standard temperature and pressure conditions.
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