LNG Liquefaction
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LNG Liquefaction Efficiency Calculator

Specific power, compressor HP, and refrigerant inventory by cycle (C3MR · DMR · SMR · Cascade · AP-X · N₂)

Estimate LNG train specific power (kWh/kg LNG) and compressor shaft duty for the major liquefaction cycles, with empirical correction for ambient temperature and cooling medium. Includes reversible-work reference (exergy minimum ≈ 0.30 kWh/kg @ 95 °F) so you can see how close a given design is to thermodynamic limit. Per API 625 and GPSA §16.

Feed & Plant

MMscfd
%
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Cycle

Ambient / Heat Sink

°F

📚 Theory

Why C3MR dominates, ambient penalty, refrigerant composition, exergy minimum and how to read efficiency vs Carnot.

Read Guide →

Equations

Specific power (ambient-corrected):

SP = SPbase · (1 + 0.005 · (Tamb − 95 °F))

Compressor shaft power:

Pshaft (kW) = SP · mLNG (kg/hr)

Reversible (exergy minimum) work:

Wmin = Tamb·|ΔS| − |ΔH| [methane proxy]

Related

❄️

Cryogenic Demethanizer

Upstream NGL extraction.
🧊

Cascaded Refrigeration

Cycle internals.
💨

BOG (Boil-Off Gas)

LNG tank vapor balance.
🧊

Hydrate Prediction

Pre-treat requirement.