Authors

Modern trends in approximation of thermodynamic properties of refrigerants

UDC 536.7

Modern trends in approximation of thermodynamic properties of refrigerants

Kletsky A. V., Mitropov V.V.

Abstract
The review and brief characteristic of different types of equations of state, that are used for the approximation of thermodynamic properties of refrigerants is presented in the article. These equations themselves and the tables of properties, calculated with their help are necessary for the calculation of the processes and cycles and also for the heat exchange apparatuses of refrigerating machines. The paper presents specific useful information on thermodynamic characteristics of refrigerant R125.

All references

1.	Клецкий А.В., Голубев И.Ф., Перельштейн И.И. Аммиак жидкий и газообразный. Плотность, энтальпия, энтропия и изобарная теплоемкость/ГССД 91 -85. -М.: Изд-во стандартов,1986.
2.	Митропов В.В., Клецкий А.В. Способы включения опытных данных в программу построения взаимосогласованных уравнений состояния//Известия СПбГУНиПТ, 2006. № 2.
3.	Рыков В.А. Термодинамические свойства R23 на линии насыщения в диапазоне температур от 180 до 298 К//Вестник МАХ. 2000. Вып. 4.
4.	De Vries В. Thermodynamische eigenschaften der alternativen кaltemittel R32, R125 und R143a -messungen und zustandsgleichungen. Dissertation, University of Hanover, Germany (1997).
5.	Kuper P., Loffler H.I. Eine neue dampftafel fur das kaltemittel 22. Kaltetechnik-Klimatisierung, 23(1971), N2.
6.	Lemmon E.W., Jacobsen R.T. An equation of state for pentafluoroethane (HFC-125) for temperatures from the triple point (172,52 K) to 500 К and pressures to 60 MPa. NIST, Boulder, 2002.
7.	Neilson E.F., White D. The heat capacity, heat of fusion, heat vaporization of chlorodifluoromethane between 16 К and boiling point. J. Amer. Chem. Soc. 79(1957).
8.	Piao C.-C, Noguchi M. An international standard equation of state for the thermodynamic properties of HFC-125 (pentafluoroethane) J. Phys. Chem. Ref. Data, 27(1998), N4.
9.	Span S., Wagner W. Equations of state for technical applications. III. Results for polar fluids. Int. J. Thermophys. 24(2003), N1.
10.	Thermophysical properties of refrigerants -R22. Tokyo. Japanese association of refrigeration, 1975.
11.	Vasserman A.A., Fominsky D.V. Unified equations of state for ozone-safe refrigerants R32 and R125 Int. J. Thermophys, 22(2001), 1089.