Methodology for Constructing the Equation of State and Thermodynamic Tables for a New Generation Refrigerant

Autor: V. A. Kolobaev, A.V. Sverdlov, A. D. Kozlov, E. E. Ustyuzhanin, V. A. Rykov, S V Rykov, P. V. Popov, I.V. Kudryavtseva
Rok vydání: 2021
Předmět:
Zdroj: Measurement Techniques. 64:86-93
ISSN: 1573-8906
0543-1972
Popis: A unified fundamental equation of state has been developed for 2,3,3,3-tetrafluoropropene (R1234yf), a fourth-generation ozone-safe refrigerant, and a method for constructing the equation has been proposed. In the gas region, this equation transforms into an equation of state of the virial form, and in the vicinity of the critical point it satisfies the requirements of the modern scale theory of critical phenomena and transforms into the Widom scale equation. Based on a single fundamental equation of state in accordance with GOST R 8.614-2018, “GSI. State Service of Standard Reference Data. Basic Provisions,” we developed standard reference data GSSSD 380-2020 on density, enthalpy, isobaric heat capacity, isochoric heat capacity, entropy and speed of sound in R1234yf in the temperature ranges 230–420 K and pressures 0.1–20 MPa. We compared the calculated values of equilibrium properties with the most reliable experimental data obtained in well-known global laboratories and tabular data obtained from the known fundamental equations of state R1234yf. Uncertainties of tabulated data for saturated vapor pressure, density, enthalpy, isobaric heat capacity, isochoric heat capacity, entropy and speed of sound of 2,3,3,3-tetrafluoropropene are estimated – standard relative uncertainties for types A, B, total standard relative and expanded uncertainties. The results obtained in this work show that the proposed unified fundamental equation of state adequately describes the equilibrium properties of R1234yf in the above stated range of state parameters.
Databáze: OpenAIRE
Externí odkaz: