Annual Fuel Utilization Efficiency
Annual fuel utilization efficiency, abbreviated as AFUE, a dimensionless number, measure the efficiency of a gas furnace or boiler will operate over an entire heating season.
Annual Fuel Utilization Efficiency formula |
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\( AFUE \;=\; ( E_o \;/\; E_i ) \;100 \) (Annual Fuel Utilization Efficiency) \( E_o \;=\; AFUE \; E_i \;/\; 100 \) \( E_i \;=\; E_0 \; 100 \;/\; AFUE \) |
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| Symbol | English | Metric |
| \( AFUE \) = efficiency | \(dimensionless\) | \(dimensionless\) |
| \( E_o \) = output energy | \(Btu\) | \(kg-m^2 \;/\; s^2\) |
| \( E_i \) = input energy | \(Btu\) | \(kg-m^2 \;/\; s^2\) |
Tags: HVAC Efficiency