Equations of State for Technical Applications. I. Simultaneously Optimized Functional Forms for Nonpolar and Polar Fluids

@article{Span2003EquationsOS,
  title={Equations of State for Technical Applications. I. Simultaneously Optimized Functional Forms for Nonpolar and Polar Fluids},
  author={Roland Span and Wolfgang Wagner},
  journal={International Journal of Thermophysics},
  year={2003},
  volume={24},
  pages={1-39}
}
New functional forms for multiparameter equations of state have been developed for non- and weakly polar fluids and for polar fluids. The resulting functional forms, which were established with an optimization algorithm which considers data sets for different fluids simultaneously, are suitable as a basis for equations of state for a broad variety of fluids. With regard to the achieved accuracy, the functional forms were designed to fulfill typical demands of advanced technical application… 
A New Functional Form for Equations of State for Some Weakly Associating Fluids
A new functional form for equations of state for polar and weakly associating fluids was developed. It was established with a simultaneous optimization algorithm developed previously. As a result,
A Corresponding States Model for Generalized Engineering Equations of State
In this work, a four-parameter corresponding-states principle (CSP) model is proposed to generalize the universal technical Equation of State (EOS) developed in our previous work. This model is in
Unified low-parametrical equation of state for engineering calculations of thermodynamic properties of substances
The new simple semi empirical equation of state for description of P --T data of "normal" substances was specified. New equation of state has 10 individual adjustable coefficients and it describes
A low-parametric state equation for calculating the thermodynamic properties of substances in liquid and gaseous state
Using methods and approaches developed by the authors, a new low-parametric state equation for describing the thermal properties of normal substances is obtained that allows us to describe the
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 25 REFERENCES
Equations of State for Technical Applications. III. Results for Polar Fluids
New functional forms have been developed for multiparameter equations of state for non- and weakly polar fluids and for polar fluids. The resulting functional forms, which were established with an
Simultaneous Optimization as a Method to Establish Generalized Functional Forms for Empirical Equations of State
A new algorithm for the optimization of functional forms of empirical equations of state is presented which considers data sets of different substances simultaneously. In this way, functional forms
A new method for optimizing the structure of thermodynamic correlation equations
An optimization strategy is presented for optimizing the structure of empirical thermodynamic correlation equations. Based on a comprehensive functional expression for the physical dependence
A Reference Equation of State for the Thermodynamic Properties of Nitrogen for Temperatures from 63.151 to 1000 K and Pressures to 2200 MPa
A new formulation for the thermodynamic properties of nitrogen has been developed. Many new data sets have become available, including high accuracy data from single and dual-sinker apparatuses which
On the extrapolation behavior of empirical equations of state
Generally, the extrapolation behavior of empirical equations of state is regarded as poor, but it can be shown that state-of-the-art equations of state yield reliable results well beyond the range
The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use
In 1995, the International Association for the Properties of Water and Steam (IAPWS) adopted a new formulation called “The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water
A New Equation of State for Argon Covering the Fluid Region for Temperatures From the Melting Line to 700 K at Pressures up to 1000 MPa
This work reviews the available data on thermodynamic properties of ethylene and presents a new equation of state in the form of a fundamental equation explicit in the Helmholtz energy. The
...
1
2
3
...