Numerical investigation of evaporator deisgn in the ejector refrigeration cycle with R134a and CO2

Neal Lawrence, Stefan Elbel

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

Abstract

Two-phase ejector studies often focus on the design and performance of the two-phase ejector and the effect it has on the performance of the ejector system. However, recent work has shown that evaporator design can also have a very significant effect on ejector cycle performance. In the present study, a numerical model of a microchannel air-to-refrigerant evaporator is developed and incorporated into thermodynamic models of the standard ejector and DX cycles. The models are used to investigate the effect of evaporator geometry, specifically the microchannel port hydraulic diameter, on the performance of the cycles. The analysis is performed using the refrigerants R134a and CO2, and the behavior of the two refrigerants with varying diameter is compared. The effects of evaporator outlet state and height-to-width ratio are also investigated. It is shown that evaporator design, not just ejector design, can have a significant effect on the COP of the ejector cycles.

Original languageEnglish (US)
Title of host publication24th IIR International Congress of Refrigeration, ICR 2015
PublisherInternational Institute of Refrigeration
Pages3348-3355
Number of pages8
ISBN (Electronic)9782362150128
DOIs
StatePublished - Jan 1 2015
Event24th IIR International Congress of Refrigeration, ICR 2015 - Yokohama, Japan
Duration: Aug 16 2015Aug 22 2015

Publication series

NameRefrigeration Science and Technology
ISSN (Print)0151-1637

Other

Other24th IIR International Congress of Refrigeration, ICR 2015
CountryJapan
CityYokohama
Period8/16/158/22/15

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ASJC Scopus subject areas

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

Cite this

Lawrence, N., & Elbel, S. (2015). Numerical investigation of evaporator deisgn in the ejector refrigeration cycle with R134a and CO2. In 24th IIR International Congress of Refrigeration, ICR 2015 (pp. 3348-3355). (Refrigeration Science and Technology). International Institute of Refrigeration. https://doi.org/10.18462/iir.icr.2015.0193