gross calorific value

(gross heat of combustion at constant volume), Qv(gross), n
the heat produced by combustion of unit quantity of a solid or liquid fuel when burned at constant volume in an oxygen bomb calorimeter under specified conditions, with the resulting water condensed to a liquid.
DISCUSSION — The conditions are initial oxygen pressure of 2 and 4 MPa (20 to 40 atm), initial and final temperatures between 20 and 35°C (68 to 95°F), products in the form of ash, water (aq), and gaseous carbon dioxide, sulfur dioxide, and nitrogen. This definition is not applied to gaseous fuels and applies to a volatile liquid fuel only if it is suitably contained during the measurement so that the vapor does not mix with the combustion oxygen before combustion. The gross calorific value is closely related to the internal energy of combustion for the same reaction at constant standard temperature and pressure, ∆U°C(at t°C). It is of opposite sign and differs by a small amount due to energy effects resulting from compression, temperature differences from t, and solution effects that vary with combustion conditions. Because of the variation of conditions allowed in the discussion above, the above definition does not lead to a unique value for any given fuel. However, the specified conditions limit the possible values to a narrow range for which approximate limits can be calculated for a given fuel.

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

Look at other dictionaries:

  • Gross Calorific Value —   The heat produced by combusting a specific quantity and volume of fuel in an oxygen bomb colorimeter under specific conditions …   Energy terms

  • net calorific value — (net heat of combustion at constant pressure), n the heat produced by combustion of unit quantity of a solid or liquid fuel when burned, at a constant pressure of 1 atm (0.1 MPa), under conditions such that all the water in the products remains… …   Coke&Coal Terminology

  • Lower heating value — The lower heating value (also known as net calorific value , net CV , or LHV ) of a fuel is defined as the amount of heat released by combusting a specified quantity (initially at 25 °C or another reference state) and returning the temperature of …   Wikipedia

  • Higher heating value — The higher heating value (HHV;also known as the 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… …   Wikipedia

  • Heat of combustion — The heat of combustion (ΔHc0) is the energy released as heat when a compound undergoes complete combustion with oxygen under standard conditions. The chemical reaction is typically a hydrocarbon reacting with oxygen to form carbon dioxide, water… …   Wikipedia

  • ГОСТ Р 54235-2010: Топливо твердое из бытовых отходов. Термины и определения — Терминология ГОСТ Р 54235 2010: Топливо твердое из бытовых отходов. Термины и определения оригинал документа: q) (calorific value, heating value): Количество энергии, полученной в результате полного сгорания топлива твердого из бытовых отходов,… …   Словарь-справочник терминов нормативно-технической документации

  • теплота сгорания — 3.5 теплота сгорания (heating value/calorific value/specific energy): Количество тепла, высвобождаемое при полном сгорании в воздухе удельного количества газообразного или жидкого топлива при условии, что сгорание происходит при постоянном… …   Словарь-справочник терминов нормативно-технической документации

  • высшая теплота сгорания — 2.1 высшая теплота сгорания (superior calorific value): Количество теплоты, которое может выделиться при полном сгорании в воздухе определенного количества газа таким образом, что давление p1, при котором происходит реакция, остается постоянным,… …   Словарь-справочник терминов нормативно-технической документации

  • ГОСТ Р 54261-2010: Ресурсосбережение. Обращение с отходами и производство энергии. Стандартный метод определения высшей теплотворной способности и зольности отходов материалов — Терминология ГОСТ Р 54261 2010: Ресурсосбережение. Обращение с отходами и производство энергии. Стандартный метод определения высшей теплотворной способности и зольности отходов материалов оригинал документа: 3.1.2.1 адиабатический калориметр… …   Словарь-справочник терминов нормативно-технической документации

  • Glossary of fuel cell terms — The Glossary of fuel cell terms lists the definitions of many terms used within the fuel cell industry. The terms in this glossary may be used by fuel cell industry associations, in education material and fuel cell codes and standards to name but …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.