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Combustion is the oxidation of carbon-containing material in the presence of sufficient oxygen to complete the process.
C + O2 > CO2
Typical combustion process efficiencies can be summarized as
The performance of a furnace is usually assessed by the following indices
μt = 100 Eo / Ei (1)
where
μt = thermal efficiency
Eo = fuel energy output (W, Btu/h)
Ei = fuel energy input (W, Btu/h)
AFUE measures the annual amount of heat actually delivered compared to the amount of fuel supplied to the furnace.
AFUE = 100 Eao / Eai (2)
where
AFUE = annual fuel utilization efficiency
Eao = annual fuel energy output (W, Btu/h)
Eai = annual fuel energy input (W, Btu/h)
Steady State Efficiency measures how efficiently a furnace converts fuel to heat, once the furnace has warmed up and is running steadily and can be expressed as
SSE= 100 (Ei - El) / Ei (2)
where
SSE = steady-state efficiency
Ei = fuel energy input (W, Btu/h)
El = fuel energy loss (W, Btu/h)
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