IIR document

R1224yd(Z) flow boiling inside a mini microfin tube.

Number: pap. n. 404

Author(s) : LONGO G., MANCIN S., RIGHETTI G., et al.


This paper presents the R1224yd(Z) flow boiling heat transfer and pressure drop measurements inside a mini microfin tube with internal diameter at the fin tip of 4.2 mm. The microfin tube was brazed inside a copper plate and electrically heated from the bottom. Sixteen T-type thermocouples are located in the copper plate to monitor the wall temperature. The experimental measurements were carried out at constant mean saturation temperature of 30°C, by varying the refrigerant mass velocity between 100 kg m-2 s-1 and 200 kg m-2 s-1, the vapor quality from 0.3 to 0.95, at three different heat fluxes: 15, 30, 60 kW m-2. The experimental results are presented in terms of two-phase heat transfer coefficient, onset dryout vapor quality, and frictional pressure drop. rop. This new HFO fluid shows promising heat transfer capabilities, which makes it a possible viable substitute of the high-GWP, low-pressure refrigerants.

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  • Original title: R1224yd(Z) flow boiling inside a mini microfin tube.
  • Record ID : 30025992
  • 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.2019.0404


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