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

Houpei Li, Pega Hrnjak

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publicationICR 2019 - 25th IIR International Congress of Refrigeration
EditorsVasile Minea
PublisherInternational Institute of Refrigeration
Pages1499-1506
Number of pages8
ISBN (Electronic)9782362150357
DOIs
StatePublished - 2019
Event25th IIR International Congress of Refrigeration, ICR 2019 - Montreal, Canada
Duration: Aug 24 2019Aug 30 2019

Publication series

NameRefrigeration Science and Technology
Volume2019-August
ISSN (Print)0151-1637

Conference

Conference25th IIR International Congress of Refrigeration, ICR 2019
CountryCanada
CityMontreal
Period8/24/198/30/19

Keywords

  • Evaporation
  • Heat transfer
  • Microchannel
  • Pressure drop
  • Refrigerant
  • Visualization

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

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