Multistream exchanger simulation

N streams in one core, feasibility via composite-curve pinch

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Governing equations

The exact equations the solver works for a multistream exchanger — 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 {stream-id: K} for all but ONE stream (the free stream closes the adiabatic energy balance, keyed by the connected edge's stream id, not index); optional pressure_drops {stream-id: Pa}, min_approach [K, default 3] — composite-curve pinch is enforced

Example flowsheets that use it

Multistream exchanger: one core, three streams, one free outlet

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Multistream exchanger simulation

Governing equations

Parameters

Example flowsheets that use it

Multistream exchanger: one core, three streams, one free outlet

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