Useful annual fuel heat calculator

Converts as-fired annual fuel mass to usable energy.

Units

Q_{\text{useful}} = M \times 2000 \times \mathrm{HV} \times \eta

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

Q_{\text{useful}} = 10 \times 2000 \times 100 \times 0.85 = 1{,}700{,}000

Symbol	Meaning	Unit
$Q_{\text{useful}}$	usable yearly fuel heat	Btu/yr
$\mathrm{HV}$	as-fired heating value	Btu/lb
$M$	annual fuel mass	short ton/yr
$\eta$	fuel-to-useful-heat efficiency	—

Symbol	Meaning	Unit
$Q_{\text{useful}}$	usable yearly fuel heat	GJ/year
$\mathrm{HV}$	as-fired heating value	kJ/kg
$M$	annual fuel mass	kg/year
$\eta$	fuel-to-useful-heat efficiency	—

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.