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REFPROP Documentation - NIST

REFPROP DocumentationRelease W. Lemmon, Ian H. Bell, Marcia L. Huber, Mark O. McLindenJun 04, 2018 CONTENTS1 REFPROP Graphical User Information .. Commands ..262 REFPROP DLL API .. API ..55iiiREFPROP Documentation , Release is an acronym for REFerence fluid PROP erties. This program, developed by the National Institute ofStandards and Technology (NIST), calculates the thermodynamic and transport properties of industrially importantfluids and their mixtures. These properties can be displayed inTablesandPlotsthrough the graphical user interface;they are also accessible through spreadsheets or user-written applications accessing theREFPROP is based on the most accurate pure fluid and mixture models currently available. It implements threemodels for the thermodynamic properties of pure fluids: equations of state explicit in Helmholtz energy, the modifiedBenedict-Webb-Rubin equation of state , and an extended corresponding states (ECS) model.

The equation parameters for mixtures composed of natural gas fluids come from the 2008 GERG model (see Pref-erences for the reference). The default pure fluid equations of state in REFPROP are not the same as those used in the GERG model, rather they are more complex with lower uncertainties. The GERG equations for the pure fluids

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