Gas turbine manufacturers generally state the efficiency of their turbines using LHV. However, natural gas in the U.S. is bought and sold on an HHV basis, so be careful that you don't mix units. Otherwise, you will buy a gas turbine that is too small for your anticipated needs.
Lower Heating Value (LHV) MJ/kg = 43.4 Higher Heating Value (HHV) MJ/kg = 46.5
The heating value when water is released in the liquid phase during fuel combustion is called the lower heating value (LHV) or net calorific value (NCV). It considers the latent heat of vaporization released as water transitions from liquid to vapor during combustion. The LHV does not include the heat energy that would be obtained from condensing the water vapor back into liquid form.
The turbine heat rate of a steam turbogenerato is the ratio of thermal input: power generated. It is often expressed in kJ/kWh. The efficiency of the turbogenerator is simply calculated from this. The plant heat rate is the ratio of fuel energy into the plant: power generated. It is greater than the turbine heat rate, because not all of the fuel's thermal energy can be captured by the boiler, and also power station services such as fuel handling, flue gas cleaning etc consume power. Consequently, more fuel is needed for each unit of useful net power produced. Plant heat rate is often expressed in kJ/kWh or Btu/kWh. The fuel energy input used in the plant heat rate calculation may be on a higher heating value (HHV) or a lower heating value (LHV) basis, and the plant power output, although usually on a net (net of plant own consumption) is sometimes on the basis of that at the generator terminals. Whatever is used should be made clear, but it often is not.
lhv
LHV 6 month certificate ?
You must provide details of the :- 1) Inlet air temperature 2) Fuel characteristic (LHV, sulphur contents, etc.) 3) Site elevation 4) Inlet / Exhaust loss 5) Open cycle type of GT ? Heat Recovery ? Then the supplier will calculate for you.
The airport code for William T. Piper Memorial Airport is LHV.
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When we are making a thermodynamic analysis of a system where diesel fuel is combusted we use the heating value of the fuel. You must determine whether you should use the higher heating value (HHV), or lower heating value (LHV), based on the application. Hope this helps.
this number is going to be all over the place, but to find an average, the technical name for the quantity you are looking for is called the Lower Heating Value or LHV. Google it, and you will quickly find an average. I found 45 MJ/kg to be reasonable. LHV is the number used in combustion engines of all kinds, jet, diesel, gasoline...
Since both units are per hour, we can omit them, that leaves us with ? kJ / 62.7 kmol nat. gas. Natural gas is usually a combination of gases, primarily methane, with some parts ethane and propane, and trace amounts of heavier hydrocarbons, sulfur, and other compounds. You also need to specify which type of "energy" you are after. In chemical engineering, we use several different definitions. The one you are probably after is how much heat you would get if you burned the gas, its heat of combusion. So, assuming that natural gas is almost completely methane, and you want to know how much energy you get from burning it, you can find through a site like NIST Chemistry Webbook. In this case, we'll use (delta)Hc = -890.7 kJ/mole. Solve for: -890.7 kJ/mol * 62.7 kmol * 1000 mol/kmol = x kJ If you are instead looking for how much energy is contained in the gas, you can lookup methane's specific enthalpy. Be aware that this number changes with temperature, pressure and phase. Oh, and lastly -- the unit is kiloJoule. A jole is a different and very obscure unit.
The lower heating value of hydrogen sulfide (H2S) is around 14,700 BTU/lb. This value represents the amount of heat released when one pound of H2S is burned completely in oxygen at constant pressure with the products cooled to 150 degrees Fahrenheit.