The calorific value of a fuel is the quantity of heat produced by its combustion – at constant pressure and under “normal” (standard) conditions (i.e. to 0^{o}C and under a pressure of 1,013 mbar).

The combustion process generates water vapor and certain techniques may be used to recover the quantity of heat contained in this water vapor by condensing it.

- Higher Calorific Value (or Gross Calorific Value – GCV, or Higher Heating Value – HHV) – the water of combustion is entirely condensed and that the heat contained in the water vapor is recovered;
- Lower Calorific Value (or Net Calorific Value – NCV, or Lower Heating Value – LHV) – the products of combustion contains the water vapor and that the heat in the water vapor is not recovered.

** Fuel Calorific Values**

Natural gas | 12500 kcal/kg |

Propane-butane | 11950 kcal/kg |

Disel | 10000 kcal/kg |

Fuel oil | 9520 kcal/kg |

Brown coal | 3500 kcal/kg |

Woods | 2500 kcal/kg |

Electricity | 860 kcal/kWh |

** 1 cubic meter of Methane weighs 0.717 kg/m³**

** 1 kW is obtained from:**

0.072 kg | natural gas |

0,073 kg | propane-butane |

0,083 kg | gasoline |

0,085 kg | disel |

0,092 kg | fuel oil |

0,124 kg | charcoal |

0,144 kg | coal |

0,218 kg | brown coal |

** Composition of Natural Gas**

Methane CH_{4} |
70-90% |

Ethane C_{2}H_{6} |
0-20% |

Propane C_{3}H_{8} |
Butane C_{4}H_{10 }Carbon Dioxide CO_{2} 0-8% |

Oxygen O_{2} |
0-0.2% |

Nitrogen N_{2} |
0-5% |

Hydrogen sulphide H_{2} |
S 0-5% |

Rare gasesA, He, Ne, Xe | trace |

ahmed eidthank you for data , we are specialized in fuel additives

Jorge MartinsWould the Calorific Values presented High or Low? I mean, should they be compared to High Heating Values or to Low Heating Values?

PrekshaWhich calorific value is termed as high or low?

MartinI am sorry, but a lot of mistakes in the tables provided.

First the dimensions: it says that 0.072 kg of NG gives 1 KW; actually this should be 1 kJ or alternatively it could have been 0.072 kg/s (consumption) delivers 1 KW.

Second, it is unclear what is meant here. I assume we are talking about the caloric value translated into “heat” and not “power”. If power is meant then much more is wrong with the tables. However, if it is combustion value (heat) also the calculation is wrong.

1 kg of NG is approx. 52000 kJ/kg caloric value which fits with 12500 kcal/kg. Then 0.072 kg of NG gives me 0.072 x 52000 = 3744 kJ -OR- 0.072 kg/s NG gives me 3,744 kW (and not 1 KW as quoted). So either there is a huge mistake, or the KW figure is electricity and inefficiencies/losses of E-generation are taken into account. However, then it does not fit with other fuels quoted.

So please update your data.

Martin

Martinfurther calcls give me:

1 kWh is 1 KW power during 3600 secs, which is

1 kJ/s during 3600 secs, which is

(1/52300) (kJ/s divided by kJ/kg) during 3600 s, which is

(1/52300) x 3600 kg NG = 0.0688 kg NG, which is close to the 0.072 kg NG per KWh.

In other words: the second table should be defined as the amount of fuel to generate 1 kWh. But again this is thermal and not yet electricity.

Martin

JayachandranThe unit in second table is kg/hr.

Amount of rate of fuel required for generating 1 kW or 1 kJ/sec energy is 0.072 kg/hr considering 95% fuel efficiency.

0.072 (kg/hr) * 12500 * 4.1868 (kJ/kg) / 3600 = (Approx.) 1 kJ/sec or 1 kW