The GERG-2008 Wide-Range Equation of State for Natural Gases and Other Mixtures: An Expansion of GERG-2004

Kunz, O; Wagner, Wolfgang

doi:10.1021/je300655b

Cited by 1,082 publications

(1,576 citation statements)

References 162 publications

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“…It is claimed that numerical diffusion related to the finite difference approximation of partial derivatives is reduced by this method [33,34], but the MOC needs much longer computation runtimes and cannot predict non-equilibrium or heterogeneous flows [25,35], while the FVM is better at dealing with multi-dimensional flow. In the existing CFD models, the cubic Peng-Robinson (PR) EOS [36] is often used due to its relatively simple mathematical form compared to other more complex (but more accurate) EOS such as AGA-8 [37], BWRS [13] and GERG [20].…”

Section: Computational Fluid Dynamics (Cfd) Technique Have Been Develmentioning

confidence: 99%

“…The modern multi-component GERG-2008 EOS [20,52] was used to provide the thermodynamic properties of CO 2 mixtures. This EOS covers the gas phase, liquid phase, supercritical region, and vapour-liquid equilibrium states for mixtures consisting of up to 21 components: methane, nitrogen, carbon dioxide, ethane, propane, n-butane, isobutane, n-pentane, isopentane, n-hexane, n-heptane, n-octane, hydrogen, oxygen, carbon monoxide, water, helium, argon, n-nonane, n-decane, and hydrogen sulphide.…”

Section: Implementation Of Gerg-2008 Eos Into Ansys Fluentmentioning

confidence: 99%

“…DECOM [17] was developed to predict the decompression wave speed in CO 2 mixtures, and is also based on assumptions similar to those in GASDECOM. The only difference was use of the NIST Standard Reference Database 23 (REFPROP version 9.0) [18], along with the built-in Span and Wagner EOS [19] for pure CO 2 and the GERG-2004 EOS [20] for multi-component CO 2 mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state

et al. 2015

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The development of CO2 pipelines for Carbon Capture and Storage (CCS) raises new questions regarding the control of ductile fracture propagation and fracture arrest toughness criteria. The decompression behaviour in the fluid must be determined accurately in order to estimate the proper pipe toughness. However, anthropogenic CO2 may contain impurities that can modify the fluid decompression characteristics quite significantly. To determine the decompression wave speed in CO2 mixtures, the thermodynamic properties of these mixtures must be determined by using an accurate equation of state. In this paper we present a new decompression model developed using the Computational Fluid Dynamics (CFD) package ANSYS Fluent. The GERG-2008 Equation of State (EOS) was implemented into this model through User Defined Functions (UDF) to predict the thermodynamic properties of CO2 mixtures. The model predictions were in good agreement with the experimental data of two 'shock tube' tests. A range of representative CO2 mixtures was examined in terms of the changes in fluid properties from the initial conditions, with time and distance, immediately after a sudden pipeline opening at one end. Phase changes that may occur within the fluid due to condensation of 'impurities' in the fluid were also investigated. Simulations were also conducted to examine how the initial temperature and impurities would affect the decompression wave speed.

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Section: Computational Fluid Dynamics (Cfd) Technique Have Been Develmentioning

confidence: 99%

Section: Implementation Of Gerg-2008 Eos Into Ansys Fluentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state

et al. 2015

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“…7 A detailed procedure of binary adsorption measurement using this set-up as well as a schematic view of the system and a reference experiment using a well known activated carbon is given in ref. 8.…”

Section: Mixed Gas Adsorption Studiesmentioning

confidence: 99%

Mixed gas adsorption of carbon dioxide and methane on a series of isoreticular microporous metal–organic frameworks based on 2-substituted imidazolate-4-amide-5-imidates

et al. 2012

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In this work the adsorption of CO 2 and CH 4 on a series of isoreticular microporous metal-organic frameworks based on 2-substituted imidazolate-4-amide-5-imidates, IFP-1-IFP-6 (IFP ¼ Imidazolate Framework Potsdam), is studied firstly by pure gas adsorption at 273 K. All experimental isotherms can be nicely described by using the Toth isotherm model and show the preferred adsorption of CO 2 over CH 4 . At low pressures the Toth isotherm equation exhibits a Henry region, wherefore Henry's law constants for CO 2 and CH 4 uptake could be determined and ideal selectivity a CO 2 /CH 4 has been calculated. Secondly, selectivities were calculated from mixture data by using nearly equimolar binary mixtures of both gases by a volumetric-chromatographic method to examine the IFPs. Results showed the reliability of the selectivity calculation. Values of a CO 2 /CH 4 around 7.5 for IFP-5 indicate that this material shows much better selectivities than IFP-1, IFP-2, IFP-3, IFP-4 and IFP-6 with slightly lower selectivity a CO 2 /CH 4 ¼ 4-6. The preferred adsorption of CO 2 over CH 4 especially of IFP-5 and IFP-4 makes these materials suitable for gas separation application.

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“…REFPROP R includes implementations of the equations of state which are necessary to obtain property data for the selected working fluids [21][22][23][24][25]. The optimizations were carried out using a genetic algorithm optimizer, with the same settings as those used in ref.…”

Section: Methodsologymentioning

confidence: 99%

Design and optimization of a novel organic Rankine cycle with improved boiling process

Andreasen¹,

Larsen

Knudsen³

et al. 2015

Energy

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In this paper we present a novel organic Rankine cycle layout, named the organic splitcycle, designed for utilization of low grade heat. The cycle is developed by implementing a simplified version of the split evaporation concept from the Kalina split-cycle in the organic Rankine cycle in order to improve the boiling process. Optimizations are carried out for eight hydrocarbon mixtures for hot fluid inlet temperatures at 120 • C and 90 • C, using a genetic algorithm to determine the cycle conditions for which the net power output is maximized. The most promising mixture is an isobutane/pentane mixture which, for the 90 • C hot fluid inlet temperature case, achieves a 14.5 % higher net power output than an optimized organic Rankine cycle using the same mixture. Two parameter studies suggest that optimum conditions for the organic split-cycle are when the temperature profile allows the minimum pinch point temperature difference to be reached at two locations in the boiler. Compared to the transcritical organic Rankine cycle, the organic split-cycle improves the boiling process without an entailing increase in the boiler pressure, thus enabling an efficient low grade heat to power conversion at low boiler pressures.

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The GERG-2008 Wide-Range Equation of State for Natural Gases and Other Mixtures: An Expansion of GERG-2004

Cited by 1,082 publications

References 162 publications

Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state

Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state

Mixed gas adsorption of carbon dioxide and methane on a series of isoreticular microporous metal–organic frameworks based on 2-substituted imidazolate-4-amide-5-imidates

Design and optimization of a novel organic Rankine cycle with improved boiling process

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