Vapor-liquid critical surface of ternary difluoromethane+pentafluoroethane+1,1,1,2-tetrafluoroethane (R-32/125/134a) mixtures

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The plane of vapor-liquid criticality for ternary refrigerant mixtures of difluoromethane (R-32)+pentafluoroethane (R-125)+1,1,1,2-tetrafluoroethane (R-134a) was determined from data on the vapor-liquid coexistence curve near the mixture critical points. The compositions (mass percentage) of the mixtures studied were 23% R-32+25% R-125+52% R-134a (R-407C), 25% R-32+15% R-125+60% R-134a (R-407E), and 20% R-32+40% R-125+40% R-134a (R-407A). The critical temperature of each mixture was determined by observation of the disappearance of the meniscus. The critical density of each mixture was determined on the basis of meniscus disappearance level and the intensity of the critical opalescence. The uncertainties of the temperature, density, and composition measurements are estimated as ±10 mK, ±5 kg·m-3, and ±0.05%, respectively. In addition, predictive methods for the critical parameters of R-32/125/134a mixtures are discussed.

Original languageEnglish
Pages (from-to)1483-1495
Number of pages13
JournalInternational Journal of Thermophysics
Volume20
Issue number5
DOIs
Publication statusPublished - Jan 1 1999
Externally publishedYes

Fingerprint

vapors
liquids
menisci
opalescence
refrigerants
temperature measurement
critical point
critical temperature
curves

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

@article{d0ff5e3fc7e24c0b81e387c8603fa9de,
title = "Vapor-liquid critical surface of ternary difluoromethane+pentafluoroethane+1,1,1,2-tetrafluoroethane (R-32/125/134a) mixtures",
abstract = "The plane of vapor-liquid criticality for ternary refrigerant mixtures of difluoromethane (R-32)+pentafluoroethane (R-125)+1,1,1,2-tetrafluoroethane (R-134a) was determined from data on the vapor-liquid coexistence curve near the mixture critical points. The compositions (mass percentage) of the mixtures studied were 23{\%} R-32+25{\%} R-125+52{\%} R-134a (R-407C), 25{\%} R-32+15{\%} R-125+60{\%} R-134a (R-407E), and 20{\%} R-32+40{\%} R-125+40{\%} R-134a (R-407A). The critical temperature of each mixture was determined by observation of the disappearance of the meniscus. The critical density of each mixture was determined on the basis of meniscus disappearance level and the intensity of the critical opalescence. The uncertainties of the temperature, density, and composition measurements are estimated as ±10 mK, ±5 kg·m-3, and ±0.05{\%}, respectively. In addition, predictive methods for the critical parameters of R-32/125/134a mixtures are discussed.",
author = "Yukihiro Higashi",
year = "1999",
month = "1",
day = "1",
doi = "10.1023/A:1021445222925",
language = "English",
volume = "20",
pages = "1483--1495",
journal = "International Journal of Thermophysics",
issn = "0195-928X",
publisher = "Springer New York",
number = "5",

}

TY - JOUR

T1 - Vapor-liquid critical surface of ternary difluoromethane+pentafluoroethane+1,1,1,2-tetrafluoroethane (R-32/125/134a) mixtures

AU - Higashi, Yukihiro

PY - 1999/1/1

Y1 - 1999/1/1

N2 - The plane of vapor-liquid criticality for ternary refrigerant mixtures of difluoromethane (R-32)+pentafluoroethane (R-125)+1,1,1,2-tetrafluoroethane (R-134a) was determined from data on the vapor-liquid coexistence curve near the mixture critical points. The compositions (mass percentage) of the mixtures studied were 23% R-32+25% R-125+52% R-134a (R-407C), 25% R-32+15% R-125+60% R-134a (R-407E), and 20% R-32+40% R-125+40% R-134a (R-407A). The critical temperature of each mixture was determined by observation of the disappearance of the meniscus. The critical density of each mixture was determined on the basis of meniscus disappearance level and the intensity of the critical opalescence. The uncertainties of the temperature, density, and composition measurements are estimated as ±10 mK, ±5 kg·m-3, and ±0.05%, respectively. In addition, predictive methods for the critical parameters of R-32/125/134a mixtures are discussed.

AB - The plane of vapor-liquid criticality for ternary refrigerant mixtures of difluoromethane (R-32)+pentafluoroethane (R-125)+1,1,1,2-tetrafluoroethane (R-134a) was determined from data on the vapor-liquid coexistence curve near the mixture critical points. The compositions (mass percentage) of the mixtures studied were 23% R-32+25% R-125+52% R-134a (R-407C), 25% R-32+15% R-125+60% R-134a (R-407E), and 20% R-32+40% R-125+40% R-134a (R-407A). The critical temperature of each mixture was determined by observation of the disappearance of the meniscus. The critical density of each mixture was determined on the basis of meniscus disappearance level and the intensity of the critical opalescence. The uncertainties of the temperature, density, and composition measurements are estimated as ±10 mK, ±5 kg·m-3, and ±0.05%, respectively. In addition, predictive methods for the critical parameters of R-32/125/134a mixtures are discussed.

UR - http://www.scopus.com/inward/record.url?scp=0033341244&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033341244&partnerID=8YFLogxK

U2 - 10.1023/A:1021445222925

DO - 10.1023/A:1021445222925

M3 - Article

AN - SCOPUS:0033341244

VL - 20

SP - 1483

EP - 1495

JO - International Journal of Thermophysics

JF - International Journal of Thermophysics

SN - 0195-928X

IS - 5

ER -