Journal ArticleDOI
Short Fundamental Equations of State for 20 Industrial Fluids
Eric W. Lemmon,Roland Span +1 more
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In this paper, the coefficients of these short forms for the equations of state have been fitted for the fluids acetone, carbon monoxide, carbonyl sulfide, decane, hydrogen sulfide and fluoromethane.Abstract:
In a preceding project, functional forms for “short” Helmholtz energy equations of state for typical nonpolar and weakly polar fluids and for typical polar fluids were developed using simultaneous optimization. In this work, the coefficients of these short forms for the equations of state have been fitted for the fluids acetone, carbon monoxide, carbonyl sulfide, decane, hydrogen sulfide, 2-methylbutane (isopentane), 2,2-dimethylpropane (neopentane), 2-methylpentane (isohexane), krypton, nitrous oxide, nonane, sulfur dioxide, toluene, xenon, hexafluoroethane (R-116), 1,1-dichloro-1-fluoroethane (R-141b), 1-chloro-1,1-difluoroethane (R-142b), octafluoropropane (R-218), 1,1,1,3,3-pentafluoropropane (R-245fa), and fluoromethane (R-41). The 12 coefficients of the equations of state were fitted to substance specific data sets. The results show that simultaneously optimized functional forms can be applied to other fluids out of the same class of fluids for which they were optimized without significant loss of a...read more
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Journal ArticleDOI
The GERG-2008 Wide-Range Equation of State for Natural Gases and Other Mixtures: An Expansion of GERG-2004
Oliver Kunz,Wolfgang Wagner +1 more
TL;DR: A new equation of state for the thermodynamic properties of natural gases, similar gases, and other mixtures, the GERG-2008, was presented in this paper, which is based on 21 natural gas components.
Proceedings ArticleDOI
Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels
J. T. Farrell,N. P. Cernansky,Frederick L. Dryer,C. K. Law,D. G. Friend,C. A. Hergart,R. M. McDavid,A. K. Patel,Charles J. Mueller,Heinz Pitsch +9 more
TL;DR: In this article, a technical program based on the use of surrogate fuels that sufficiently emulate the chemical complexity inherent in conventional diesel fuel is discussed and the essential components of such a program are discussed and include: (a) surrogate component selection; (b) the acquisition or estimation of requisite elementary chemical kinetic, thermochemical, and physical property data; (c) the development of accurate predictive chemical kinetic models, together with the measurement of the necessary fundamental laboratory data to validate these mechanisms; and (d) mechanism reduction tools to render the coupled chemistry/flow calculations feasible.
Journal ArticleDOI
Analysis and optimization of the low-temperature solar organic Rankine cycle (ORC)
TL;DR: In this article, the authors considered the case in which the thermal energy required by a solar ORC is supplied by means of stationary solar collectors and derived the operating conditions of the ORC that minimizes the aperture area needed per unit of mechanical power output for every working fluid and every solar collector.
Proceedings ArticleDOI
Development of an Experimental Database and Chemical Kinetic Models for Surrogate Gasoline Fuels
William J. Pitz,N. P. Cernansky,Frederick L. Dryer,Fokion N. Egolfopoulos,J. T. Farrell,D. G. Friend,Heinz Pitsch +6 more
TL;DR: The development of surrogate mixtures that represent gasoline combustion behavior is reviewed in this article, where the authors make recommendations for the initial components to be included in gasoline surrogates for near term development.
Journal ArticleDOI
Density, Refractive Index, Interfacial Tension, and Viscosity of Ionic Liquids [EMIM][EtSO4], [EMIM][NTf2], [EMIM][N(CN)2], and [OMA][NTf2] in Dependence on Temperature at Atmospheric Pressure
TL;DR: The density, refractive index, interfacial tension, and viscosity of ionic liquids (ILs) were studied in dependence on temperature at atmospheric pressure both by conventional techniques and by surface light scattering (SLS).
References
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Journal ArticleDOI
The International Temperature Scale of 1990 (ITS-90)
TL;DR: The International Temperature Scale of 1990 as mentioned in this paper was adopted by the International Committee of Weights and Measures at its meeting in 1989, in accordance with the request embodied in Resolution 7 of the 18th General Conference of WEMS of 1987.
Journal ArticleDOI
Thermodynamic Properties of Key Organic Oxygen Compounds in the Carbon Range C1 to C4. Part 1. Properties of Condensed Phases
TL;DR: A survey of the published values of heat capacity and enthalpy obtained from calorimetric measurements on the crystal, glass, and liquid phases of the first few members of homologous series expressed as polynomial functions of temperature were fit to selected data by a least squares procedure as mentioned in this paper.
Journal ArticleDOI
An Empirical Equation for Thermodynamic Properties of Light Hydrocarbons and Their Mixtures I. Methane, Ethane, Propane and n-Butane
TL;DR: In this article, an empirical equation for the isothermal variation with density of the work content of pure hydrocarbons in the gaseous or liquid state is given, and a procedure is suggested for determining numerical values of the parameters in the equation.
Journal ArticleDOI
Thermodynamic Properties of Air and Mixtures of Nitrogen, Argon, and Oxygen From 60 to 2000 K at Pressures to 2000 MPa
TL;DR: In this paper, a thermodynamic property formulation for standard dry air based upon available experimental p-ρ-T, heat capacity, speed of sound, and vapor-liquid equilibrium data is presented.
Journal ArticleDOI
CODATA Recommended Values of the Fundamental Physical Constants 1998*$\dagger$
P.J. Mohr,B.N. Taylor +1 more
TL;DR: In this paper, the authors presented a self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology ~CODATA! for international use.
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