Critical parameters for HFC134a, HFC32 and HFC125

研究成果: ジャーナルへの寄稿記事

65 引用 (Scopus)

抄録

The vapour-liquid coexistence curves near the critical point for HFC134a (CF3CH2F: 1,1,1,2-tetrafluoroethane), HFC32 (CH2F2: difluoromethane) and HFC125 (CHF2CF3: pentafluoroethane) have been measured by visual observation of the meniscus disappearance. Three sets of 17 experimental results for the saturated liquid or vapour densities for HFC134a, HFC32 and HFC125 have been obtained in the reduced temperature range T/Tc > 0.96 and in the reduced density range 0.4 < ρ/ρc < 1.7. From these measurements, the critical temperature and the critical density for these HFCs have been determined in consideration of the meniscus disappearance level as well as the intensity of the critical opalescence. The critical pressure has been calculated by the extrapolation of the vapour-pressure correlation. The uncertainties of the critical temperature, critical density and critical pressure are estimated to be within ± 10 mK, ± 5 kg m-3 and ± 9 kPa, respectively.

元の言語英語
ページ(範囲)524-531
ページ数8
ジャーナルInternational Journal of Refrigeration
17
発行部数8
DOI
出版物ステータス出版済み - 1994
外部発表Yes

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norflurane
Temperature
vapors
Vapor Pressure
Pressure
Density of liquids
Density of gases
Vapor pressure
Extrapolation
temperature
Uncertainty
liquids
vapor pressure
Vapors
Observation
uncertainty
Liquids
difluoromethane

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering

これを引用

Critical parameters for HFC134a, HFC32 and HFC125. / Higashi, Y.

:: International Journal of Refrigeration, 巻 17, 番号 8, 1994, p. 524-531.

研究成果: ジャーナルへの寄稿記事

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title = "Critical parameters for HFC134a, HFC32 and HFC125",
abstract = "The vapour-liquid coexistence curves near the critical point for HFC134a (CF3CH2F: 1,1,1,2-tetrafluoroethane), HFC32 (CH2F2: difluoromethane) and HFC125 (CHF2CF3: pentafluoroethane) have been measured by visual observation of the meniscus disappearance. Three sets of 17 experimental results for the saturated liquid or vapour densities for HFC134a, HFC32 and HFC125 have been obtained in the reduced temperature range T/Tc > 0.96 and in the reduced density range 0.4 < ρ/ρc < 1.7. From these measurements, the critical temperature and the critical density for these HFCs have been determined in consideration of the meniscus disappearance level as well as the intensity of the critical opalescence. The critical pressure has been calculated by the extrapolation of the vapour-pressure correlation. The uncertainties of the critical temperature, critical density and critical pressure are estimated to be within ± 10 mK, ± 5 kg m-3 and ± 9 kPa, respectively.",
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N2 - The vapour-liquid coexistence curves near the critical point for HFC134a (CF3CH2F: 1,1,1,2-tetrafluoroethane), HFC32 (CH2F2: difluoromethane) and HFC125 (CHF2CF3: pentafluoroethane) have been measured by visual observation of the meniscus disappearance. Three sets of 17 experimental results for the saturated liquid or vapour densities for HFC134a, HFC32 and HFC125 have been obtained in the reduced temperature range T/Tc > 0.96 and in the reduced density range 0.4 < ρ/ρc < 1.7. From these measurements, the critical temperature and the critical density for these HFCs have been determined in consideration of the meniscus disappearance level as well as the intensity of the critical opalescence. The critical pressure has been calculated by the extrapolation of the vapour-pressure correlation. The uncertainties of the critical temperature, critical density and critical pressure are estimated to be within ± 10 mK, ± 5 kg m-3 and ± 9 kPa, respectively.

AB - The vapour-liquid coexistence curves near the critical point for HFC134a (CF3CH2F: 1,1,1,2-tetrafluoroethane), HFC32 (CH2F2: difluoromethane) and HFC125 (CHF2CF3: pentafluoroethane) have been measured by visual observation of the meniscus disappearance. Three sets of 17 experimental results for the saturated liquid or vapour densities for HFC134a, HFC32 and HFC125 have been obtained in the reduced temperature range T/Tc > 0.96 and in the reduced density range 0.4 < ρ/ρc < 1.7. From these measurements, the critical temperature and the critical density for these HFCs have been determined in consideration of the meniscus disappearance level as well as the intensity of the critical opalescence. The critical pressure has been calculated by the extrapolation of the vapour-pressure correlation. The uncertainties of the critical temperature, critical density and critical pressure are estimated to be within ± 10 mK, ± 5 kg m-3 and ± 9 kPa, respectively.

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