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Thermal conductivities of HFO refrigerants at superheated vapor condition

発表形態:
原著論文
主要業績:
主要業績
単著・共著:
共著
発表年月:
2014年11月
DOI:
会議属性:
国際会議(国内開催を含む)
査読:
無し
リンク情報:

日本語フィールド

著者:
Keishi KARIYA, Akio MIYARA, Soichiro MORI
題名:
Thermal conductivities of HFO refrigerants at superheated vapor condition
発表情報:
The International Symposium on New Refrigerants and Environmental Technology 2014 (JRAIA international symposium Kobe 2014) ページ: 317-318
キーワード:
HFO refrigerants, thermal conductivity, superheated vapor
概要:
抄録:
Constructing low carbon society is one of our urgent issues for preserving sustainable modern life. Replacing refrigerants which have high global warming potential (GWP) by low GWP refrigerants is one of measures for this. Hydrofluoroolefins (HFOs) have gotten great attention as promising candidates of next generation refrigerants because they have low GWP. R1234yf, R1234ze(E) and R1234ze(Z) of which GWP are below 1 will be used as alternative refrigerants of car air-conditioners, turbo refrigerators and high tempareature heat pump systems, respectively. Thermophysical properties of these new refrigerants are necessary to evaluate performance and to design systems. There are, however, limited experimental data of their properties. Especially, few experimental data exist for thermal conductivities of R1234ze(Z) under superheated condition though there are some data for thermodynamic properties [1,2]. In this study, thermal conductivity of R1234ze(Z) (cis-1,3,3,3-tetrafluoropropene) was measured at superheated vapour conditions with well-known transient hot-wire method. Schematic of the measurment apparatus is shown in Fig.1. Short and long platinum wires with diameter of 15μm were used as the line heat source. This study also deals with development of correlations of thermal conductivity based on the experimental data using an extended corresponding states (ECS) model[3]. The results show that there are good agreement between the predictions and the present measurements. The experimental data and the calculation results are shown in Fig. 2.

英語フィールド

Author:
Keishi KARIYA, Akio MIYARA, Soichiro MORI
Title:
Thermal conductivities of HFO refrigerants at superheated vapor condition
Announcement information:
The International Symposium on New Refrigerants and Environmental Technology 2014 (JRAIA international symposium Kobe 2014) Page: 317-318
Keyword:
HFO refrigerants, thermal conductivity, superheated vapor
An abstract:
Constructing low carbon society is one of our urgent issues for preserving sustainable modern life. Replacing refrigerants which have high global warming potential (GWP) by low GWP refrigerants is one of measures for this. Hydrofluoroolefins (HFOs) have gotten great attention as promising candidates of next generation refrigerants because they have low GWP. R1234yf, R1234ze(E) and R1234ze(Z) of which GWP are below 1 will be used as alternative refrigerants of car air-conditioners, turbo refrigerators and high tempareature heat pump systems, respectively. Thermophysical properties of these new refrigerants are necessary to evaluate performance and to design systems. There are, however, limited experimental data of their properties. Especially, few experimental data exist for thermal conductivities of R1234ze(Z) under superheated condition though there are some data for thermodynamic properties [1,2]. In this study, thermal conductivity of R1234ze(Z) (cis-1,3,3,3-tetrafluoropropene) was measured at superheated vapour conditions with well-known transient hot-wire method. Schematic of the measurment apparatus is shown in Fig.1. Short and long platinum wires with diameter of 15μm were used as the line heat source. This study also deals with development of correlations of thermal conductivity based on the experimental data using an extended corresponding states (ECS) model[3]. The results show that there are good agreement between the predictions and the present measurements. The experimental data and the calculation results are shown in Fig. 2.


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