Investigating micro-fin and smooth tubes in horizontal two-phase flow boiling using R-1234ze and R-134a refrigerants

Kaggwa Abdul*, Chi-Chuan Wang

*Corresponding author for this work

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

Abstract

Global warming is becoming a major issue to the environmental perspective of view and one of the several causes is the release of refrigerants to the atmosphere. This research investigates refrigerant R-1234ze that is considered to substitute R-134a. A microfin and smooth tube with 9.5mm outer diameter was used in a twophase flow horizontal convective boiling to study the pressure drop and the enhancement of heat transfer coefficients. The brazed microfin inside a stainless steel tube was heated electrically with current. Thermocouples were inserted in the wall to measure the temperature distribution. The measurements were carried out at saturation temperature of 20°C by varying the refrigerant mass velocity between 50 kg/m2s and 200 kg/m2s, the vapor quality from 0.1 to 0.9, at different heat fluxes. Results from the two refrigerants and tubes were analyzed and compared basing on the values of the two-phase heat transfer coefficient and pressure drop.

Original languageEnglish
Title of host publication4th IIR International Conference on Sustainability and the Cold Chain, Proceedings
EditorsDon Cleland, Andrew East, James Carson, Richard Love
PublisherInternational Institute of Refrigeration
Pages104-111
Number of pages8
ISBN (Electronic)9782362150142
DOIs
StatePublished - 1 Jan 2016
Event4th IIR International Conference on Sustainability and the Cold Chain - Albany, Auckland, New Zealand
Duration: 7 Apr 20169 Apr 2016

Publication series

NameRefrigeration Science and Technology
Volume2016-January
ISSN (Print)0151-1637

Conference

Conference4th IIR International Conference on Sustainability and the Cold Chain
CountryNew Zealand
CityAlbany, Auckland
Period7/04/169/04/16

Keywords

  • Heat transfer coefficients
  • Micro-fin and smooth tubes
  • Pressure drop
  • R-1234ze and R-134a

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    Abdul, K., & Wang, C-C. (2016). Investigating micro-fin and smooth tubes in horizontal two-phase flow boiling using R-1234ze and R-134a refrigerants. In D. Cleland, A. East, J. Carson, & R. Love (Eds.), 4th IIR International Conference on Sustainability and the Cold Chain, Proceedings (pp. 104-111). (Refrigeration Science and Technology; Vol. 2016-January). International Institute of Refrigeration. https://doi.org/10.18462/iir.iccc.2016.0014