Wobbe Index definition

Wobbe Index means an indicator of the interchangeability of fuel gases used to compare the combustion energy output of different composition fuel gases in an appliance;
Wobbe Index or “WI” shall mean the GCV divided by the square root of the relative density.
Wobbe Index or "W" means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions:

Examples of Wobbe Index in a sentence

  • Wobbe Index is derived by dividing the higher heating value of the gas in Btu per standard cubic foot by the square root of its specific gravity with respect to air.

  • The Wobbe Index of the gas shall not be less than 1,309 and not greater than 1,382.

  • In the case of compressed natural gas/biomethane (CNG) there are generally two types of fuel, high calorific fuel (H-gas) and low calorific fuel (L-gas), but with a significant spread within both ranges; they differ significantly in their energy content expressed by the Wobbe Index and in their λ-shift factor (Sλ).

  • A utility shall apply to the Commission when seeking to establish or change a Wobbe Index.

  • The application shall include the proposed Wobbe Index for each distinguishable distribution area and shall use a calculation of the weighted mean Wobbe Index for the gas delivered to the distribution area during a representative historic 12-month period.


More Definitions of Wobbe Index

Wobbe Index means the Gross Heating Value on a volumetric basis at specified reference conditions divided by the square root of the Specific Density at the same specified metering reference conditions of Gas. [“Indice di Wobbe” in the Italian text]
Wobbe Index means a measure of the thermal input through a fixed orifice, calculated by dividing the natural gas Gross Heating Value in mega joules per cubic meter by the square root of the natural gas specific gravity with respect to air, based on a gross or higher heating value (HHV) at standard conditions 14.73 psi/60o F, 101.325Kpa/15o C real, dry basis.
Wobbe Index means the superior calorific value divided by the square root of the relative density under normal conditions, in which:
Wobbe Index means a main indicator of fuel burning characteristics used to compare combustion energy output of different composition of fuel gases in an appliance.
Wobbe Index means the index obtained when the energy content of the gas in (MJ/m³n) is divided by the square root of the relative density of the gas.
Wobbe Index means the number obtained by the formula:
Wobbe Index means when applied to gas, the calorific value divided by the square root of the Relative Density.