Energy and greenhouse gases

Calorific Values of Common Fuels

2014-12-31 10:03:52 | Lượt xem: 5312 | Energy and greenhouse gases

Reference calorific values of common fuels for assessing boiler energy-saving opportunities.

Calorific value expresses the heat released by burning one unit of fuel. When comparing fuels or preparing an energy balance, use a consistent calorific-value basis and consistent units.

Calorific-value table from the archive

Archived reference table: check actual fuel calorific values and the calculation basis before use.

English translation of the archived image

No.	Fuel	Calorific value, kJ/kg (kcal/kg in parentheses)
1	Subbituminous coal A	24,490–26,823 (6,400)
2	Subbituminous coal B	22,158–24,490 (5,850)
3	Subbituminous coal C	19,358–22,158 (5,293)
4	Lignite A	14,693–19,358 (4,624)
5	Lignite B	14,693 (3,510)
6	Heavy fuel oil (FO)	41,131–43,138 (10,030)
7	Diesel oil (DO)	43,138 (10,030)
8	Liquefied petroleum gas (LPG)	39,927–54,900 (13,115)
9	Natural gas	55,979; or 37,118 kJ/m³ at 1 atm and 20 °C (13,372)
10	Rice-husk briquettes	11,720 (2,800)
11	Sawdust briquettes	17,580 (4,200)

Values reproduce the image, including its approximate conversions; the qualifications below apply.

The older image does not specify whether all values are higher or lower heating values. It should not replace a fuel certificate or the factors selected for a report. Approximate conversions must be checked.

Useful unit relationships

1 kWh = 3.6 MJ = 3,600 kJ.
1 MJ = 1,000 kJ; 1 GJ = 1,000 MJ.
On the conventional energy basis, 1 TOE = 41.868 GJ = 11.63 MWh.
TOE is a conventional energy unit. Do not assume that every physical tonne of fuel oil is exactly 1 TOE.

Applying the information in an energy audit

Before calculating, identify the fuel type, moisture content, calorific-value basis, mass or volume unit and measurement conditions. Where fuel quality varies, prioritise analysis results or supplier records relevant to the calculation period.

Refer to SEAI's conversion factors and calorific-value definitions. The older conversion table is retained for comparison with archived records; the standardised relationships above take precedence. See also energy auditing.

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