Annual Fuel Utilization Efficiency

on . Posted in HVAC Engineering

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

\( AFUE \;=\; ( E_o \;/\; E_i ) \;100 \)     (Annual Fuel Utilization Efficiency)

\( E_o \;=\;   AFUE \; E_i \;/\; 100 \)

\( E_i \;=\;   E_0 \; 100 \;/\; AFUE \)

Symbol English Metric
\( AFUE \) = efficiency \(dimensionless\)
\( E_o \) = output energy \(Btu\) \(kg-m^2 \;/\; s^2\)
\( E_i \) = input energy \(Btu\) \(kg-m^2 \;/\; s^2\)

 

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Tags: HVAC Efficiency