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Boiling heat transfer and pressure drop of R1234ze(E) inside a small-diameter 2.5 mm microfin tube.

Number: pap. 2542

Author(s) : JIGE D., IIZUKA S., INOUE N.

Summary

This study experimentally investigated the flow boiling heat transfer and pressure drop of R1234ze(E) in a horizontal small-diameter microfin tube with an outer diameter of 2.5 mm and equivalent diameter of 2.1 mm. The boiling heat transfer and pressure drop were measured in the mass velocity range of 100–400 kg/(m2s) and in the heat flux range of 5–20 kW/m2 at a saturation temperature of 15°C. The heat transfer coefficient increased as the quality increased because of increasing the forced convection in the pre-dryout region. The heat transfer coefficient increased as the heat flux increased in the low-quality region, but decreased when the heat flux increased past a certain point because the thin liquid film at the fin tips had dried. The heat transfer coefficient increased as the mass velocity increased and exhibited the highest value at a mass velocity of 200 kg/(m2s). The measured heat transfer coefficient agreed well with previous correlations only in the dominant region of the forced convection evaporation. The frictional pressure drop increased as the mass velocity and vapor quality increased, and the measured values agreed well with previously reported correlations for conventional-diameter microfin tubes.

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Pages: 8

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Details

  • Original title: Boiling heat transfer and pressure drop of R1234ze(E) inside a small-diameter 2.5 mm microfin tube.
  • Record ID : 30024640
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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