What is the difference between higher heating value HHV and lower heating value LHV of the fuel?

December 1, 2020 Off By idswater

What is the difference between higher heating value HHV and lower heating value LHV of the fuel?

So, in summary: 1. The numerical difference between the LHV and HHV of a fuel is roughly equivalent to the amount of latent heat of vaporization that can be practically recovered in a secondary condenser per unit of fuel burned. The numerical value of HHV is always greater than or equal to the LHV.

What is lower heating value LHV?

Lower heating value (LHV) represent quantitatively the combustion heat released from a given amount of fuel when complete combustion is achieved.

How do you convert lower heating value to higher heat value?

Under this formula, the relationship between the lower heating value of a fuel and the higher heating value of that fuel is: LHV = HHV – 10.55(W + 9H) Where: LHV = lower heating value of fuel in Btu/lb, HHV = higher heating value of fuel in Btu/lb, W = Weight % of moisture in fuel, and H = Weight % of hydrogen in fuel.

Which heating value is more important?

If water is present as vapor, then the heating value is called net calorific value. In real operating situations, water in exhaust gases is present as vapor, so net calorific value is more important for energy efficiency calculations.

Is a higher heat of combustion better?

For example, if equal quantities of two isomeric hydrocarbons burn to produce equal amounts of carbon dioxide and water, the one releasing more energy (i.e., with the higher heat of combustion) is the less stable, since it was the more energetic in its compounded form. …

What is the LHV of methanol?


Fuel Density Lower Heating Value (LHV) (Net Calorific Value – NCV)
@0°C/32°F, 1 bar
Methanol 0.791 8568
Methyl ester (biodiesel) 0.888 16122
MTBE 0.743 15090

What is low heating value?

low heat value. [′lō ′hēt ‚val·yü] (thermodynamics) The heat value of a combustion process assuming that none of the water vapor resulting from the process is condensed out, so that its latent heat is not available. Also known as lower heating value; net heating value.

What is the lower heating value of natural gas?

Lower heating values neglect the energy in the water vapor formed by the combustion of hydrogen in the fuel. This water vapor typically represents about 10% of the energy content. Therefore the lower heating values for natural gas are typically 900 – 950 Btu per cubic foot.

What is the fuel heating value?

Heat Values of Various Fuels. The heat value of a fuel is the amount of heat released during its combustion. Also referred to as energy or calorific value, heat value is a measure of a fuel’s energy density, and is expressed in energy (joules) per specified amount (e.g. kilograms). Heat value. Hydrogen (H 2)

What is the heating value of diesel fuel?

That said petrol and diesel fuels have approximately the same heat value, petrol at 44–46MJ/kg, diesel around 45MJ/kg, or around 10000kcal/kg. One gallon of American Diesel Fuel has 139,000 BTU = 35,028 kcal of energy.