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Heat transfer coefficient, pressure drop, and flow visualization for some new low GWP refrigerants during evaporation in small tube.

Number: pap. n. 1255

Author(s) : LI H., HRNJAK P.

Summary

This paper shows comprehensive data and analysis for low GWP refrigerants evaporation in a microchannel tube with a hydraulic diameter of 0.643 mm. Measurements over the entire range of qualities are completed in one pass to have conditions similar to a real heat exchanger. Six heat transfer coefficients, six diabatic pressure drops, and six visualizations at exits are obtained simultaneously. This is especially important when testing mixtures where the local concentration of fluid (specifically in the liquid next to the wall) is changing as quality changes along the channel. Data are presented in an actual, non-isobaric condition due to pressure drop along the tube. Results presented and compared for different experimental condition (mass flux, heat flux, saturation temperature, etc.). Discussion of results is enhanced with video captures presenting flow patterns. Refrigerants R1233zd(E), R1336mzz(Z), and mixture R448A are under evaluation in this paper.

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Pages: 8

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Details

  • Original title: Heat transfer coefficient, pressure drop, and flow visualization for some new low GWP refrigerants during evaporation in small tube.
  • Record ID : 30026086
  • 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.2019.1255

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