| Webster's Online Dictionary |
| Expressions | Definition | ||
| Heating value | Heating value (or calorific value) is used to define the amount of heat released during the combustion of a fuel or food. It is measured in units of energy per amount of material. Depending on the context, heating values may be reported as Btu/m³, kcal/kg, kJ/kg, J/mol, or a variety of other combinations of units. Heating value in commonly determined by use of a bomb calorimeter. (references) | ||
| 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) | ||
| Lower heating value | 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. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
| Expressions | Domain | Definition | |
| Heating value | Energy | 1: The maximum amount of energy that is available from burning a substance. (references) | |
| 2: See Heat Content of a Quantity of Fuel, Gross and Heat Content of a Quantity of Fuel, Net. (references) | |||
| 3: Higher heating value (HHV) is the potential combustion energy when water vapor from combustion is condensed to recover the latent heat of vaporization. Lower heating value (LHV) is the potential combustion energy when water vapor from combustion is not condensed. See also higher heating value and lower heating value. (references) | |||
| 4: The average number of British thermal units per cubic foot of natural gas as determined from tests of fuel samples. (references) | |||
| Heating value | Mechanical Engineering | Energy produced per unit amount of a substance when the substance undergoes complete combustion; cf. net calorific value; gross calorific value. Source: European Union. (references) | |
| Heating value | Physics | The amount of heat produced by the complete combustion of a given amount of fuel. (references) | |
| Heating value (total) | Energy | The number of British Thermal Units (BTUs) 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. 1) 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). 2) 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. (references) | |
| Higher Heating Value | Energy | 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.) (HHV). (references) | |
| Higher heating value | Physics | Net calorific value plus the quantity of heat per unit mass produced when the water vapour 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) | |
| Lower Heating Value | Energy | The lower or net heat of combustion for a fuel that assumes that all products of combustion are in a gaseous state. (See Net Heating Value below.) (Net). (references) | |
| Lower heating value | Chemical Industry | 1: The number of heat units measured as being liberated when unit mass of fuel is burned in oxygen saturated with water vapor in a bomb under standardized conditions, the residual materials being taken as gaseous oxygen, carbon dioxide, sulphur dioxide and nitrogen, water as water vapor and ash. The standardized conditions are defined in ISO-R-1928-71. The international reference temperature is 25°C (1). Source: European Union. (references) | |
| 2: The amount of heat liberated by the complete combustion, under specified conditions, of unit volume of a gas, the water produced by the combustion of the gas being assumed to remain as a vapour, the other products of combustion being referred to the standardised test conditions as applied in different countries. Hencethe net calorific value is the gross calorific value less the latent heat of evaporation of the water that formed during combustion of the fuel(2). Source: European Union. (references) | |||
| Lower heating value | Energy | See HEATING VALUE. (references) | |
| Lower heating value | Environment | Net heat of combustion (Hunt, Energy dict. ). Source: European Union. (references) | |
| Lower 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 remains as a vapor and the heat of the vapor is not recovered; also known as net calorific value. See higher heating value. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
Topics by Level of Interest: HEATING VALUE | ||||
| Topics sorted by level of Interest | Level (1=low, 600=high) | Topics sorted Alphabetically | Level (1=low, 600=high) | |
| Heating value | 22 | Heating value | 22 | |
| Higher heating value | 6 | Higher heating value | 6 | |
| Lower heating value | 6 | Lower heating value | 6 | |
Source: the editor, created by/for EVE to gauge likely levels of human interest in linguistically triggered topics (compiled across various sources, such as Wikipedia and specialty expression glosses). | ||||
