LNG exchanger (cold box) simulation

2-6 streams in one core, outlet i pairs with inlet i

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Governing equations

The exact equations the solver works for a lng exchanger (cold box) — the same math shown in the app's "Theory" panel, not a black box.

\sum_k F_k\,(h_{k,out}-h_{k,in}) = 0 \quad(\text{one free stream closes the balance})

\Delta T_{min} = \min_Q\left[T_{hot}(Q) - T_{cold}(Q)\right] \ge \Delta T_{approach}

$F_k$: stream k molar flow [mol/s]
$h_k$: stream k molar enthalpy [J/mol]
$T_{hot}(Q)$: hot composite-curve temperature at cumulative duty Q [K]
$T_{cold}(Q)$: cold composite-curve temperature at cumulative duty Q [K]
$\Delta T_{min}$: pinch — minimum internal approach [K]

Parameters

outlet_temperatures {inlet-index: K} for all but ONE stream (the free stream closes the energy balance); optional pressure_drops {inlet-index: Pa}, min_approach [K, default 2] — composite-curve pinch is enforced

Example flowsheets that use it

LNG exchanger (cold box) simulation

Governing equations

Parameters

Example flowsheets that use it

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