Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of xCO(2) + (1-x)R404A

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The thermophysical properties and critical parameters for the alternative refrigerant R404A ( 52 wt % of 1,1,1-trifluoroethane (R143a) + 44 wt % of pentafluoroethane (R125) + 4 wt % of 1,1,1,2-tetrafluoroethane (R134a)) were investigated using two different acoustic techniques. The critical behavior of the system xCO(2) + (1 - x) R404A was also investigated. Experimental data of speed of sound in liquid R404A from 258 K to 338 K and pressures up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties are calculated, combining our experimental data with density and isobaric heat capacity values published by other authors. Measurements of the critical temperature T-c and pressure p(c) on (R404A) and mixtures of xCO(2) + ( 1 - x) R404A were performed using another simple ultrasonic time-delay technique. The binary critical line was determined over the whole composition range showing that this system deviates only slightly from ideality since the critical line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining rules was used to correlate the binary experimental data.
Original languageEnglish
Pages (from-to)1148-1155
JournalJournal of Chemical and Engineering Data
Volume51
Issue number3
DOIs
Publication statusPublished - May 2006

Fingerprint

norflurane
Thermodynamic properties
Acoustics
Acoustic wave velocity
Refrigerants
Equations of state
Specific heat
Time delay
Ultrasonics
Liquids
Chemical analysis
Temperature
1,1,1-trifluoroethane
pentafluoroethane

Keywords

  • Thermodynamic properties
  • 65 MPA
  • Pressures
  • Speed
  • Sound
  • Mixtures
  • Equation
  • State
  • Equilibria
  • R-404A

Cite this

@article{e78fc139d45c451e81a3ad1fef746e24,
title = "Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of xCO(2) + (1-x)R404A",
abstract = "The thermophysical properties and critical parameters for the alternative refrigerant R404A ( 52 wt {\%} of 1,1,1-trifluoroethane (R143a) + 44 wt {\%} of pentafluoroethane (R125) + 4 wt {\%} of 1,1,1,2-tetrafluoroethane (R134a)) were investigated using two different acoustic techniques. The critical behavior of the system xCO(2) + (1 - x) R404A was also investigated. Experimental data of speed of sound in liquid R404A from 258 K to 338 K and pressures up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties are calculated, combining our experimental data with density and isobaric heat capacity values published by other authors. Measurements of the critical temperature T-c and pressure p(c) on (R404A) and mixtures of xCO(2) + ( 1 - x) R404A were performed using another simple ultrasonic time-delay technique. The binary critical line was determined over the whole composition range showing that this system deviates only slightly from ideality since the critical line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining rules was used to correlate the binary experimental data.",
keywords = "Thermodynamic properties, 65 MPA, Pressures, Speed, Sound, Mixtures, Equation, State, Equilibria, R-404A",
author = "J. Esperanca and Pires, {Pedro F.} and Nuno Ribeiro and Guedes, {Henrique Jos{\'e} Rodrigues} and Tania Lopes-Costa and Ricardo, {Ana Isabel Nobre Martins Aguiar de Oliveira}",
year = "2006",
month = "5",
doi = "10.1021/je0600707",
language = "English",
volume = "51",
pages = "1148--1155",
journal = "Journal of Chemical and Engineering Data",
issn = "0021-9568",
publisher = "AMER CHEMICAL SOC",
number = "3",

}

TY - JOUR

T1 - Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of xCO(2) + (1-x)R404A

AU - Esperanca, J.

AU - Pires, Pedro F.

AU - Ribeiro, Nuno

AU - Guedes, Henrique José Rodrigues

AU - Lopes-Costa, Tania

AU - Ricardo, Ana Isabel Nobre Martins Aguiar de Oliveira

PY - 2006/5

Y1 - 2006/5

N2 - The thermophysical properties and critical parameters for the alternative refrigerant R404A ( 52 wt % of 1,1,1-trifluoroethane (R143a) + 44 wt % of pentafluoroethane (R125) + 4 wt % of 1,1,1,2-tetrafluoroethane (R134a)) were investigated using two different acoustic techniques. The critical behavior of the system xCO(2) + (1 - x) R404A was also investigated. Experimental data of speed of sound in liquid R404A from 258 K to 338 K and pressures up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties are calculated, combining our experimental data with density and isobaric heat capacity values published by other authors. Measurements of the critical temperature T-c and pressure p(c) on (R404A) and mixtures of xCO(2) + ( 1 - x) R404A were performed using another simple ultrasonic time-delay technique. The binary critical line was determined over the whole composition range showing that this system deviates only slightly from ideality since the critical line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining rules was used to correlate the binary experimental data.

AB - The thermophysical properties and critical parameters for the alternative refrigerant R404A ( 52 wt % of 1,1,1-trifluoroethane (R143a) + 44 wt % of pentafluoroethane (R125) + 4 wt % of 1,1,1,2-tetrafluoroethane (R134a)) were investigated using two different acoustic techniques. The critical behavior of the system xCO(2) + (1 - x) R404A was also investigated. Experimental data of speed of sound in liquid R404A from 258 K to 338 K and pressures up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties are calculated, combining our experimental data with density and isobaric heat capacity values published by other authors. Measurements of the critical temperature T-c and pressure p(c) on (R404A) and mixtures of xCO(2) + ( 1 - x) R404A were performed using another simple ultrasonic time-delay technique. The binary critical line was determined over the whole composition range showing that this system deviates only slightly from ideality since the critical line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining rules was used to correlate the binary experimental data.

KW - Thermodynamic properties

KW - 65 MPA

KW - Pressures

KW - Speed

KW - Sound

KW - Mixtures

KW - Equation

KW - State

KW - Equilibria

KW - R-404A

U2 - 10.1021/je0600707

DO - 10.1021/je0600707

M3 - Article

VL - 51

SP - 1148

EP - 1155

JO - Journal of Chemical and Engineering Data

JF - Journal of Chemical and Engineering Data

SN - 0021-9568

IS - 3

ER -