Fuel thermal input
Mass flow in kg/h and LHV in MJ/kg. The result is thermal input; it does not include equipment efficiency.
P = ṁ × LHV / 3.6
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Open learning
Calculation tools and references to review combustion concepts. Results are calculated in your browser, with no registration.
Gross Wobbe index
HHV in MJ/m³ and relative density to air at the same reference conditions. Similar Wobbe values do not guarantee interchangeability or flame stability.
W = HHV / √d
Lambda and excess air
Algebraic relationship between supplied and stoichiometric air. It does not estimate lambda from measured O₂ or account for air infiltration.
Excess air = (λ − 1) × 100%
Educational tools for checking basic relationships. Equipment design and modifications require a process-specific assessment.
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Wobbe-index definition reference: MME technical report. (new tab)