The amount of heat developed by the complete combustion of a unit quantity of a material. Heating values for natural gas are usually expressed as the Btu per Cf of gas at designated conditions (temperature and pressure) and either on the dry or water saturated basis.
The average number of British thermal units per unit of weight or volume of a fuel (e.g. Btus per cubic foot of natural gas) as determined from tests of fuel samples.
The quantity of heat released by a fuel through complete combustion. It is commonly expressed in Btu per lb, per gallon, or cu-ft.
The amount of heat produced by the complete combustion of a given amount of fuel.
Amount of heat which may be obtained by burning a fuel. The heating value is usually expressed in Btu per lb
a measure of the useful energy content of different fuels.
The number of British Thermal Units ( BTU s) produced by the combustion of one cubic foot of gas at constant pressure, when the products of combustion are cooled to the initial temperature of the gas and air, when the water vapor formed during combustion is condensed, and when all the necessary corrections have been applied. Lower (LHV) - The value of the heat of combustion of a fuel as measured by allowing all products of combustion to remain in the gaseous state. This method of measure does not take into account the heat energy put into the vaporization of water (heat of vaporization). Higher (HHV) - The value of the heat of combustion of a fuel as measured by reducing all of the products of combustion back to their original temperature and condensing all water vapor formed by combustion. This value takes into account the heat of vaporization of water.
Total heating value of the gas normally measured on a dry basis (unless otherwise specified). It is defined as the number of British thermal units evolved by the complete combustion, at constant pressure, of one standard cubic foot of gas with air. The temperature of the gas, air and products of combustion 60 degrees Fahrenheit and all of the water formed by the combustion reaction condensed to the liquid state.
The amount of heat produced by the complete combustion of a unit quantity of fuel. The gross, or higher, heating value is that which is obtained when all of the products of combustion are cooled to the temperature existing before combustion, the water vapor formed during combustion is condensed, and all the necessary corrections have been made. The net, or lower, heating value is obtained by subtracting the latent heat of vaporization of the water vapor formed by the combustion of the hydrogen in the fuel from the gross, or higher, heating value.
The average number of British thermal units per cubic foot of natural gas as determined from tests of fuel samples. Imports: Natural gas received in the Continental United States (including Alaska) from a foreign country.
The amount of heat produced from the complete combustion of a unit of fuel. The higher (or gross) heating value is that when all products of combustion are cooled to the pre-combustion temperature, water vapor formed during combustion is condensed, and necessary corrections have been made. Lower (or net) heating value is obtained by subtracting from the gross heating value the latent heat of vaporization of the water vapor formed by the combustion of the hydrogen in the fuel.
The heat energy derived from a unit volume of gas.
energy content of an energy carrier. Upper and lower heating value are distinguished. Upper heating value: total energy content of the energy carrier. Lower heating value: energy content reduced by the condensation energy (latent heat) of the product gas (the steam in the product gas, to be exact).
The number of British thermal units produced by the complete combustion of one cubic foot of gas at constant pressure. Heating value includes the heat involved in cooling the combustion products back to the initial temperature of the gas-air mixture and condensing the water vapor formed by combustion.
The heating value or calorific value of a substance, usually a fuel or food, is the amount of heat released during the combustion of a specified amount of it. The calorific value is a characteristic for each substance. It is measured in units of energy per unit weight: Btu/m³, kcal/kg, kJ/kg, J/mol, or other units.
