Dictionary - Definition of HIGHER HEATING VALUE

Webster's Online Dictionary
with Multilingual Thesaurus Translation



Earth's largest dictionary with more than 1226 modern languages and Eve!

Common Expressions: HIGHER HEATING VALUE

Expressions	Definition
Higher heating value	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. (references)
Source: compiled by the editor from various references; see credits.			Top

Specialty Expressions: HIGHER HEATING VALUE

Expressions	Domain	Definition
Higher heating value	Physics	Net calorific value plus the quantity of heat per unit mass produced when the water vapor is condensed at 20 C; In the case of solid and liquid fuels of low volatility, the heat produced by combustion of unit quantity, at constant volume, in any oxygen-bomb calorimeter under specified conditions. Source: European Union. (references)
Higher heating value	Weather	Quantity of heat liberated by the complete combustion of a unit volume or weight of a fuel assuming that the produced water vapor is completely condensed and the heat is recovered; also known as gross calorific value. See lower heating value. (references)
Higher heating value (HHV)	Energy	1: See HEATING VALUE. (references)
		2: The maximum heating value of a fuel sample, which includes the calorific value of the fuel (bone dry) and the latent heat of vaporization of the water in the fuel. (See moisture content and net (lower) heating value, below.). (references)
		3: The maximum potential energy in dry fuel. For wood, the range is from7,600 to 9,600 Btu/lb. (references)
Higher heating value (HHV, also known as gross heat of combustion)	Energy	The heat produced by combustion of one unit of substance at constant volume in an oxygen bomb calorimeter under specified conditions. The conditions are: initial oxygen pressure of 2.0-4.0 MPa (20-40 atm), final temperature of 20-35C, products in the form of ash, liquid water, gaseous CO and N, and dilute aqueous HCl and HSO. It is assumed that if significant quantities of metallic elements are combusted, they are converted to their oxides. In the case of materials such as coal, wood, or refuse, if small or trace amounts of metallic elements are present, they are unchanged during combustion and are part of the ash. (references)
Source: compiled by the editor from various references; see credits.			Top