The formula to calculate the actual fuel consumption rate in a biomass furnace is:

\[ FCR_a = \frac{W_{fc}}{T_o} \]

Where:

• \(FCR_a\) is the actual fuel consumption rate in kilograms per hour (kg/hr).
• \(W_{fc}\) is the weight of fuel consumed in kilograms (kg).
• \(T_o\) is the operating time in hours (hr).