Thermal conductivity of CFC alternatives. (Measurements of HCFC-123 and HFC-134a in the liquid phase by the transient hot-wire method)

Yoshihiro Ueno, Yuji Kobayashi, Yuji Nagasaka, Akira Nagashima

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Absolute and precise measurements have been made of the thermal conductivity of HCFC-123 and HFC-134a (CFC Alternatives) in the liquid phase with a newly developed transient hot-wire apparatus for a low-temperature range. Up to the present, few experimental data about their thermal conductivity have been reported, particularly in the temperature range below 250K. The measurements have been performed on both substances in the temperature range from 193K to 353K, and in the pressure range from 1 MPa to 30MPa. The accuracy of the measurements is estimated to be ± 0.5%. It is found that the thermal conductivity of HCFC-123 is 12 to 15% smaller than that of CFC-11; on the other hand, in the case of HFC-134a, the thermal conductivity have is about 5 to 25% larger than that of CFC-12.

Original languageEnglish
Pages (from-to)3169-3175
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume57
Issue number541
Publication statusPublished - 1991 Sep
Externally publishedYes

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chlorofluorocarbons
Chlorofluorocarbons
Thermal conductivity
liquid phases
thermal conductivity
wire
Wire
Liquids
Temperature
temperature

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "Absolute and precise measurements have been made of the thermal conductivity of HCFC-123 and HFC-134a (CFC Alternatives) in the liquid phase with a newly developed transient hot-wire apparatus for a low-temperature range. Up to the present, few experimental data about their thermal conductivity have been reported, particularly in the temperature range below 250K. The measurements have been performed on both substances in the temperature range from 193K to 353K, and in the pressure range from 1 MPa to 30MPa. The accuracy of the measurements is estimated to be ± 0.5{\%}. It is found that the thermal conductivity of HCFC-123 is 12 to 15{\%} smaller than that of CFC-11; on the other hand, in the case of HFC-134a, the thermal conductivity have is about 5 to 25{\%} larger than that of CFC-12.",
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T1 - Thermal conductivity of CFC alternatives. (Measurements of HCFC-123 and HFC-134a in the liquid phase by the transient hot-wire method)

AU - Ueno, Yoshihiro

AU - Kobayashi, Yuji

AU - Nagasaka, Yuji

AU - Nagashima, Akira

PY - 1991/9

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N2 - Absolute and precise measurements have been made of the thermal conductivity of HCFC-123 and HFC-134a (CFC Alternatives) in the liquid phase with a newly developed transient hot-wire apparatus for a low-temperature range. Up to the present, few experimental data about their thermal conductivity have been reported, particularly in the temperature range below 250K. The measurements have been performed on both substances in the temperature range from 193K to 353K, and in the pressure range from 1 MPa to 30MPa. The accuracy of the measurements is estimated to be ± 0.5%. It is found that the thermal conductivity of HCFC-123 is 12 to 15% smaller than that of CFC-11; on the other hand, in the case of HFC-134a, the thermal conductivity have is about 5 to 25% larger than that of CFC-12.

AB - Absolute and precise measurements have been made of the thermal conductivity of HCFC-123 and HFC-134a (CFC Alternatives) in the liquid phase with a newly developed transient hot-wire apparatus for a low-temperature range. Up to the present, few experimental data about their thermal conductivity have been reported, particularly in the temperature range below 250K. The measurements have been performed on both substances in the temperature range from 193K to 353K, and in the pressure range from 1 MPa to 30MPa. The accuracy of the measurements is estimated to be ± 0.5%. It is found that the thermal conductivity of HCFC-123 is 12 to 15% smaller than that of CFC-11; on the other hand, in the case of HFC-134a, the thermal conductivity have is about 5 to 25% larger than that of CFC-12.

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