Define higher calorific value of fuel.
Answers
Answer:
The higher heating value (also known gross calorific value or gross energy) of a fuel is defined as the amount of heat released by a specified quantity (initially at 25°C) once it is combusted and the products have returned to a temperature of 25°C, which takes into account the latent heat of vaporization of water in
The lower heating value (also known as net calorific value) of a fuel is defined as the amount of heat released by combusting a specified quantity (initially at 25°C) and returning the temperature of the combustion products to 150°C, which assumes the latent heat of vaporization of water in the reaction products is not recovered.
The higher heating value (also known gross calorific value or gross energy) of a fuel is defined as the amount of heat released by a specified quantity (initially at 25°C) once it is combusted and the products have returned to a temperature of 25°C, which takes into account the latent heat of vaporization of water in the combustion products.
Btu = British thermal units; scf = standard cubic feet.
The heating values for gaseous fuels in units of Btu/lb are calculated based on the heating values in units of Btu/scf and the corresponding fuel density values. The heating values for liquid fuels in units of Btu/lb are calculated based on heating values in unit of Btu/gal and the corresponding fuels density values.
The heating values in units of MJ/kg, are converted from the heating values in units of Btu/lb.
For solid fuels, the heating values in units of Btu/lb are converted from the heating values in units of Btu/ton.
Coal characteristics assumed by GREET for electric power production.
Coal characteristics assumed by GREET for hydrogen and Fischer-Tropsch diesel production.
The HHV figure for liquid hydrogen in Btu/gal is based on personal communication with Ye Wu of Argonne National Laboratory.