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Saturated R1234yf flow boiling inside a compact microfin tube.

Number: 1052

Author(s) : LONGO G. A., MANCIN S., RIGHETTI G., ZILIO C.

Summary

This paper explores the heat transfer and fluid flow characteristics of the low-GWP refrigerant R1234yf during flow boiling inside a mini microfin tube with internal diameter at the fin tip of 4.2 mm, 40 fins, 0.15 mm high, and a helix angle of 18°. The microfin tube is brazed inside a copper plate, electrically heated from the bottom. Several T-type thermocouples are inserted in the wall to measure the temperature distribution during the phase change process. In particular, the experimental measurements were carried out at constant mean saturation temperature of 30 °C, by varying the refrigerant mass velocity between 200 kg m-2 s-1 and 400 kg m-2 s-1, the vapor quality from 0.2 to 0.95, at three different heat fluxes: 15, 30, and 45 kW m-2. The experimental results are presented in terms of the two-phase heat transfer coefficient, onset of dryout vapor quality, and frictional pressure drop as a function of the operating test conditions.

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Pages: 8

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Details

  • Original title: Saturated R1234yf flow boiling inside a compact microfin tube.
  • Record ID : 30028815
  • Languages: English
  • Subject: Technology
  • Source: 2nd IIR Conference on HFO Refrigerants and Low GWP Blends
  • Publication date: 2021/06
  • DOI: http://dx.doi.org/10.18462/iir.HFO.2021.1052
  • Document available for consultation in the library of the IIR headquarters only.

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