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Thermal Conductivity Calculation Model for Refrigerant Mixtures in the Vapor Phase

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Abstract

Thermal conductivity measurements of ten refrigerant mixtures (R-404A, R-406A, R-407C, R-409A, R-410A, R-415A, R-507A, R-227ea/R-134a 61.5/38.5, R-227ea/R-134a 88.8/11.2 and R-227ea/R-134a 45/55) in the gas phase are analyzed. The thermal conductivity was studied with the same experimental setup, which improved the reliability of the results, excluding thereby systematic errors caused by using different methods to measure thermal conductivity. The reported experimental data have 1.5 % to 2.5 % uncertainty at 0.95 confidence level with a coverage factor of k = 2. Equations for calculating thermal conductivity depending on temperature and pressure are given for each mixture. The equations for thermal conductivity on the dew line and in the ideal gas state are obtained. A model for predicting thermal conductivity on a wide range of state parameters is proposed based on obtained experimental data and the theory of thermodynamic similarity. A comparison of the experimental data with the calculation model gives the standard deviation at 0.4 % to 2.1 %, which does not exceed the measurement error.

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Data Availability

The datasets generated during and analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the state contract with IT SB RAS (121031800219-2).

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Authors and Affiliations

  1. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Lavrentyev Avenue, Novosibirsk, Russia, 630090

    Elena Raschektaeva & Sergey Stankus

Authors
  1. Elena Raschektaeva
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  2. Sergey Stankus
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Contributions

E.P. Raschektaeva contributed to the experimental study, calculations and the main text of the article. S.V. Stankus participated in the generalization and analysis of the data and in the editing of the article. All authors read and approved the final manuscript.

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Correspondence to Elena Raschektaeva.

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Raschektaeva, E., Stankus, S. Thermal Conductivity Calculation Model for Refrigerant Mixtures in the Vapor Phase. Int J Thermophys 44, 65 (2023). https://doi.org/10.1007/s10765-023-03172-8

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