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The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers.The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment ...
The Wobbe index is expressed in MJ/Nm³ (where 'Nm³' indicates'm³ in Normal conditions), or sometimes in BTU/scf.In the case of natural gas (molar mass 17 g/mol), the typical heating value is around 39 MJ/Nm³ (1,050 BTU/scf) and the specific gravity is approximately 0.59, giving a typical Wobbe index of 51 MJ/Nm³ (1,367 BTU/scf).
Soot Index (SI) – an empirical index that relates the composition of a gas to its tendency to produce soot during combustion in a gas appliance. [7] The calorific value of manufactured gas is around 500 Btu per cubic foot (18,629 kJ/m 3). Whereas, the calorific value of natural gas is twice that at around 1000 Btu per cubic foot (37,259 kJ/m ...
Gas had an efficiency of 43.9%, with ±0.5% repeatability in the measurement. This level of efficiency is only possible if the pan is big enough for the burner. [26] Japanese gas flames are angled upwards towards the pot to increase efficiency. [25] The efficiency of gas appliances can be raised by using special pots with heatsink-like fins.
One GGE of natural gas is 126.67 cubic feet (3.587 m 3) at standard conditions. This volume of natural gas has the same energy content as one US gallon of gasoline (based on lower heating values: 900 BTU/cu ft (9.3 kWh/m 3) of natural gas and 114,000 BTU/US gal (8.8 kWh/L) for gasoline). [22]
The therm (symbol, thm) is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU), [1] and approximately 105 megajoules, 29.3 kilowatt-hours, 25,200 kilocalories and 25.2 thermies. One therm is the energy content of approximately 100 cubic feet (2.83 cubic metres) of natural gas at standard temperature and pressure .
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Coal or coke oven gas typically had a calorific value between 10 and 20 megajoules per cubic metre (270 and 540 Btu/cu ft); with values around 20 MJ/m 3 (540 Btu/cu ft) being typical. The advent of electric lighting forced utilities to search for other markets for manufactured gas.
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