BOG recondenser simulation

boil-off vapour + subcooled LNG -> recondensed liquid (+ surplus vapour)

Governing equations

The exact equations the solver works for a bog recondenser — the same math shown in the app's "Theory" panel, not a black box.

$\dot n_{LNG}$

subcooled send-out LNG [mol/s]

$\dot n_{BOG}$

boil-off vapour to be condensed [mol/s]

$\Delta h_{sub}$

subcooling available per mole of LNG [J/mol]

$\Delta h_{cond}$

heat the vapour must give up to condense [J/mol]

$h_L$

liquid molar enthalpy [J/mol]

$T_{LNG}$

subcooled LNG temperature [K]

$T_{bub}$

bubble point at the recondenser pressure [K]

$P$

pressure [Pa]

Parameters

puts boil-off back into the liquid instead of flaring it: the subcooling in the send-out LNG condenses the vapour. Two inlets (BOG vapour + subcooled LNG, told apart by phase). Reports lng_to_bog_ratio against the minimum_ratio the energy balance demands; below it the surplus vapour leaves as a SECOND outlet rather than being silently condensed

Example flowsheets that use it