When water is produced in a combustion process, the enthalpy of combustion depends on whether water ends up as a liquid or a vapor. The difference may be significant because the latent heat of condensation is large. Fuels are often defined by a higher heating value (HHV) and a lower heating value (LHV). The HHV is defined as the "amount of heat released by a specified quantity (initially at 25 Celcius) once it is combusted and the products have returned to a temperature of 25 Celcius". Which heating value considers water as a vapor and which as a liquid?

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There are two types of heating values HHV and LHV We need to specify ... View the full answer