Effect of Flash Gas Bypass on the Performance of R134a Mobile Air-Conditioning System with Microchannel Evaporator

Hanfei Tuo, Algirdas Bielskus, Pega Hrnjak

Research output: Contribution to journalArticlepeer-review

Abstract

This paper demonstrates that the implementation of Flash Gas Bypass method can improve the performance of conventional direct expansion R134a mobile air-conditioning system with a microchannel evaporator. This method uses flash gas tank after expansion valve to separate and bypass flash refrigerant vapor around the evaporator, and feed the evaporator with only liquid refrigerant. Pressure drop is reduced and refrigerant distribution is significantly improved, resulting in higher evaporator effectiveness and evaporation pressure. Both lower pressure drop and lifted evaporation pressure allows the compressor to work with lower pressure ratio, saving required compressor work. An experimental comparison of the direct expansion system shows that Flash Gas Bypass method increases the cooling capacity and COP at the same time by up to 16% and 11%, respectively. Thus, the implementation of this method is very promising for the system using a microchannel evaporator which is especially very sensitive to the refrigerant side maldistribution.

Original languageEnglish (US)
Pages (from-to)231-239
Number of pages9
JournalSAE International Journal of Materials and Manufacturing
Volume4
Issue number1
DOIs
StatePublished - Apr 1 2011

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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