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Effect of lubricating oil on flow boiling heat transfer of low-GWP refrigerants in extruded multi-port tubes.

Number: pap. n. 821

Author(s) : HIHARA E., SAITOH S., DANG C.

Summary

The effects of lubricating oil on flow boiling of low Global Warming Potential refrigerants (R-290, R-1234yf, and R-32) in extruded multiport tubes with 18 mini-channels with a square cross-section (0.9× 0.9 mm) were experimentally investigated. In the experiments, local heat transfer coefficients, flow visualization, and pressure drops were measured, and the effect of lubricating oil was investigated. The experiments were conducted at oil circulation rates of 0–5.4 wt%, inlet quality of 0–0.25, mass flux of 25–200 kg•m-2•s-1, heat flux of 2.1–8.1 kW•m-2, and evaporation temperature of 15 °C. Polyolester oil was used. The addition of a small amount of oil increased the heat transfer coefficient, but as the amount of oil increased, the heat transfer coefficient decreased. The pressure drop increased proportionally with the oil circulation rate; the pressure drops of R290, R-1234yf, and R32 were also compared.

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Details

  • Original title: Effect of lubricating oil on flow boiling heat transfer of low-GWP refrigerants in extruded multi-port tubes.
  • Record ID : 30026038
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0821

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