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 MORITitle：Thermal conductivities of HFO refrigerants at superheated vapor conditionAnnouncement information:The International Symposium on New Refrigerants and Environmental Technology 2014 (JRAIA international symposium Kobe 2014) Page: 317-318Keyword：HFO refrigerants, thermal conductivity, superheated vaporAn 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.