Then, the heat of combustion can be calculated from the standard enthalpy of formation (ΔH f°) of the substances involved in the reaction, given as tabulated values. ΔH f° : heat (enthalpy) of formation at standard conditions (25☌, 1 bar) Where ΔH c° : heat of combustion at standard conditions (25☌ and 1 bar) Generally, the heat of combustion can be expressed as the following: It is the same as the gross heating valueor energy content. The heat of combustion is utilised to quantify the performance of a fuel in a combustion system such as furnaces, motors and power generation turbines. Where Z is any other products formed during the reaction and n, m, x, y and z are the number of moles of each molecule in the balanced equation. NX + mO 2 → xCO 2 (g) + yH 2O (l) + zZ + heat of combustion In thermodynamical terms it is the negative of the enthalpy change for the combustion reaction. Standard heat of combustion: The energy liberated when a substance X undergoes complete combustion, with excess of oxygen at standard conditions (25☌ and 1 bar).
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