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4 Απρ 2017 · This short note aims to define and clarify the different uses of four most commonly used heating value terms, which are high heating value (HHV) or gross calorific value (GCV), low...
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The lower heating value (LHV), also known as the net calorific value (NCV), is defined as the amount of heat released by fully combusting a specified quantity less the heat of vaporization of the water in the combustion product.
Using a fuel consumption on an LHV basis with a HHV gas price can lead to a significant underestimation of fuel costs. Using an efficiency or gas consumption straight off a data sheet can easily wipe out the typical margins expected on energy sale contracts.
HeatmgValuesofNaturalGas andItsComponents U.S.DEPARTMENTOFCOMMERCE NationalBureauofStandards CenterforChemicalPhysics ChemicalThermodynamicsDivision Washington,DC20234 May1982 TechnicalReport IssuedAugust1982 redby eInternationaldesImportateurs GaznaturalLiquifie(GIIGNAL)
The concepts of fuel exergy for fuels and exergy of diffusion for inert species is clearly established. The choice of the value of the exergy of diffusion of liquid water is particularly sensitive when calculating the exergy value of hydrocarbon fuels in systems with gas condensation.
The influence of the biomass moisture content on the HHV and LHV is exemplified for a fuel with a HHV of 19 MJ/kg and a hydrogen content of 6% (top). The corresponding ratios of fuel and water ...
19 Ιουν 2023 · The Higher Heating Value is the enthalpy change for reaction (1), which includes the heat released when 4 mol of gaseous water from the combustion cool to 25 o C, so its value is more negative than the LHV by four times the heat of condensation of water (–2043.2 + 4 x (–-44) = –2219.2 kJ):
