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Thermodynamic Property Measurements of Binary Refrigerant Blends HFO1123 + R290

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Abstract

PVTx properties of 0.80 mass fraction HFO1123 + 0.20 mass fraction R290 and 0.65 mass fraction HFO1123 + 0.35 mass fraction R290 refrigerant blends were measured in the temperature range from 300 K to 400 K and at pressures up to 6.9 MPa by the isochoric method along 6 isochores for each blend including the vapor and liquid phases. The expanded uncertainties in temperature and pressure are estimated to be 5 mK and 1.0 kPa (k = 2). The relative expanded uncertainties in density and mass fraction are estimated to be 0.15% and 0.0005 (k = 2), respectively. Saturated densities of these blends were directly measured in the temperature range between 319 K and 342 K by the visual observation of the meniscus disappearance, and also determined from the inflection points of the PVTx isochore-lines. Finally, the critical points of the blends were determined by the consideration of the meniscus disappearing level as well as the intensity of the critical opalescence as Tc = 334.91 ± 0.01 K, ρc = 402 ± 3 kg·m−3 and Pc = 4392 ± 3 kPa for 0.80 mass fraction HFO1123 + 0.20 mass fraction R290, and Tc = 340.94 ± 0.02 K, ρc = 357 ± 3 kg·m−3 and Pc = 4429 ± 5 kPa for 0.65 mass fraction HFO1123 + 0.35 mass fraction R290. A Helmholtz energy equation of state (EOS) was compared with the experimental data, and is in good agreement with the obtained PVTx property data with an absolute average deviation (AAD) of 1.1% for 0.80 mass fraction HFO1123 + 0.20 mass fraction R290, and that of 0.7% for 0.65 mass fraction HFO1123 + 0.35 mass fraction R290 in density. In addition, vapor-liquid equilibrium data of HFO1123 + R290 blends were obtained from 263 K to 323 K based on the recirculation method. A mixing parameter of a simple cubic EOS was determined, and the EOS represents the VLE data with an AAD of 0.73% in pressure and 0.010 mol·mol−1 in mole fraction.

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Data Availability

No datasets were generated or analysed during the current study.

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Acknowledgements

This research has been supported by a grant from New Energy and Industrial Technology Development Organization (NEDO), Japan. We are grateful to AGC, Inc., for providing the high purity samples of HFO1123.

Funding

This work is based on results obtained from the projects (JPNP18005, JPNP23001) commissioned by the New Energy and Industrial Technology Development Organization (NEDO), Japan.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan

    Naoya Sakoda & Hiroaki Ishimaru

  2. Research Center for Next Generation Refrigerant Properties (NEXT-RP), International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan

    Naoya Sakoda & Yukihiro Higashi

Authors
  1. Naoya Sakoda
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  2. Hiroaki Ishimaru
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  3. Yukihiro Higashi
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Contributions

N.S. wrote the manuscript, prepared the figures, set up the experiments, and analyzed the data. H.I. conducted the experiments and analyzed the data. Y.H. prepared the samples, conducted the experiments, analyzed the data, and supervised the work. All authors reviewed the manuscript.

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Correspondence to Naoya Sakoda.

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Selected Papers of the 22nd European Conference on Thermophysical Properties.

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Sakoda, N., Ishimaru, H. & Higashi, Y. Thermodynamic Property Measurements of Binary Refrigerant Blends HFO1123 + R290. Int J Thermophys 45, 62 (2024). https://doi.org/10.1007/s10765-024-03330-6

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