The heating value (or energy value or calorific value) of a substance, usually a fuel or food (see food energy), is the amount of heat released during the combustion of a specified amount of it. The calorific value is the total energy released as heat when a substance undergoes complete combustion with oxygen under standard conditions .

总热值（GHV，Gross Heating Value） 跟以气态形式被排放出来的水有关，并包括在燃烧之前存在于燃料中的水。 这个值对于像是 木材 或是 煤 等燃料来说非常重要，因为这些燃料 通常在燃烧之前都包含一定量的水 。

热值（calorific value），又称卡值或发热量。在燃料化学中，表示燃料质量的一种重要指标。单位质量（或体积）的燃料完全燃烧时所放出的热量。通常用热量计（卡计）测定或由燃料分析结果算出。有高热值（higher calorific value）和低热值（lower calorific value） 两种。

燃烧热（英語： Heat of combustion ）（Δ c H 0 ）是指101kPa时，1莫耳纯物质完全燃烧生成稳定的氧化物时候放出的热量。 它一般用单位物质的量、单位质量或单位体积的燃料燃烧时放出的能量计量，當燃燒熱以kJ/mol為單位計時又叫作 標準摩爾燃燒焓 。

The gross or high heating value is the amount of heat produced by the complete combustion of a unit quantity of fuel. In thermodynamics, the term standard heat of combustion corresponds to Gross heating value. See Heat of combustion for examples of calculation of gross heating values from standard heat of formation of substances.

Higher and lower calorific values (heating values) for fuels like coke, oil, wood, hydrogen and others. Energy content or calorific value is the same as the heat of combustion , and can be calculated from thermodynamical values, or measured in a suitable apparatus:

HHV (Higher Heating Value) and LHV (Lower Heating Value) are two measures used to quantify the energy content of a fuel. The main difference between the two lies in the treatment of the water vapor produced during the combustion process.

The higher heating value (also known as 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, which takes into account the latent heat of vaporization of water in the combustion products.

Combustion heat values for gases like acetylene, blast furnace gas, ethane, biogas and more - Gross and Net values. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

2024年7月19日 · What Does Heating Value Mean? Heating value is the amount of heat obtained when fuel or some other substance of a specific unit quantity is combusted. There are two types of heating values: The lower heating value (net) is the difference between combustion and latent heat of vaporization of the water vapors formed from combustion.