# The ISM equation of state applied to refrigerants

## Abstract

In this work, the authors apply an equation of state based on statistical-mechanical perturbation theory to liquid refrigerants and their mixtures. Three temperature-dependent parameters are needed to use the equation of state: the second virial coefficient, B{sub 2}(T), an effective van der Waals covolume, b(T), and a scaling factor, {alpha}(T). The second virial coefficients are calculated from a correlation based on the heat of vaporization, {Delta}H{sub vap}, and the liquid density at the freezing point, p{sub fp}. {alpha}(T) and {beta}(T) can also be calculated from the second virial coefficient by a scaling rule. Based on the theory, these two temperature-dependent parameters depend only on the repulsive branch of the potential function, and therefore, by the procedure, can be found from {Delta}H{sub vap} and p{sub fp}. The theory has considerable predictive power, since it permits the construction of the p-v-T surface from the heat of vaporization plus the triple-point density. The equation of state is tested for pure, two- and three-component liquid refrigerant mixtures.

- Authors:

- Publication Date:

- Research Org.:
- Persian Gulf Univ., Boushehr (IR)

- OSTI Identifier:
- 20020847

- Resource Type:
- Journal Article

- Journal Name:
- International Journal of Thermophysics

- Additional Journal Information:
- Journal Volume: 20; Journal Issue: 5; Other Information: PBD: Sep 1999; Journal ID: ISSN 0195-928X

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; EQUATIONS OF STATE; REFRIGERANTS; MIXTURES; VIRIAL EQUATION; VAN DER WAALS FORCES; SCALING LAWS; PERTURBATION THEORY; TEMPERATURE DEPENDENCE

### Citation Formats

```
Eslami, H., Sabzi, F., and Boushehri, A.
```*The ISM equation of state applied to refrigerants*. United States: N. p., 1999.
Web. doi:10.1023/A:1021401407904.

```
Eslami, H., Sabzi, F., & Boushehri, A.
```*The ISM equation of state applied to refrigerants*. United States. doi:10.1023/A:1021401407904.

```
Eslami, H., Sabzi, F., and Boushehri, A. Wed .
"The ISM equation of state applied to refrigerants". United States. doi:10.1023/A:1021401407904.
```

```
@article{osti_20020847,
```

title = {The ISM equation of state applied to refrigerants},

author = {Eslami, H. and Sabzi, F. and Boushehri, A.},

abstractNote = {In this work, the authors apply an equation of state based on statistical-mechanical perturbation theory to liquid refrigerants and their mixtures. Three temperature-dependent parameters are needed to use the equation of state: the second virial coefficient, B{sub 2}(T), an effective van der Waals covolume, b(T), and a scaling factor, {alpha}(T). The second virial coefficients are calculated from a correlation based on the heat of vaporization, {Delta}H{sub vap}, and the liquid density at the freezing point, p{sub fp}. {alpha}(T) and {beta}(T) can also be calculated from the second virial coefficient by a scaling rule. Based on the theory, these two temperature-dependent parameters depend only on the repulsive branch of the potential function, and therefore, by the procedure, can be found from {Delta}H{sub vap} and p{sub fp}. The theory has considerable predictive power, since it permits the construction of the p-v-T surface from the heat of vaporization plus the triple-point density. The equation of state is tested for pure, two- and three-component liquid refrigerant mixtures.},

doi = {10.1023/A:1021401407904},

journal = {International Journal of Thermophysics},

issn = {0195-928X},

number = 5,

volume = 20,

place = {United States},

year = {1999},

month = {9}

}