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Experimental evaluation of dynamic compositions of refrigerant mixture in heat pump system by NIR absorption spectroscopy.

Number: 0725

Author(s) : MIYAWAKI K., SHIKAZONO N.

Summary

Near-infrared absorption spectra of difluoromethane (R32) and 2,3,3,3-tetrafluoropropene (R1234yf) were experimentally measured for superheated gas and subcooled liquid under various conditions to develop an estimation method of dynamic compositions for zeotropic mixtures in a heat pump system. Attenuation coefficient of the gas refrigerant showed significant variation depending on the operating conditions, while liquid phase showed relatively constant absorption characteristics at different pressures and temperatures. The estimation model of absorption characteristics for refrigerant mixtures constructed using the liquid phase spectra of pure refrigerant was validated using the experiment data with circulation compositions of R32 : R1234yf = 30 : 70, 50 : 50 and 70 : 30 mass%. The statical data qualitatively showed good agreement with the measured spectra. In addition, the model was applied to measure the dynamic composition shift and verified by comparing the result with the data obtained by a conventional technique.

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Pages: 11

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Details

  • Original title: Experimental evaluation of dynamic compositions of refrigerant mixture in heat pump system by NIR absorption spectroscopy.
  • Record ID : 30031874
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0725

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