Contribution of heat exchangers in improved performance of new generation automotive air-conditioning system with R-744

Michael Giannavola, Jianmin Yin, Clark Bullard, Pega Hrnjak

Research output: Contribution to journalConference article

Abstract

This paper describes results of a project to develop and compare the performance of a second-generation mobile R-744 air-conditioning system to the first mobile R-744 system tested by our group. An analysis of results obtained with the first-generation system indicated many possible areas of improvement. Thus, the impetus for constructing and subsequently testing the second-generation system was to demonstrate that significant gains in system performance were possible with enhanced system components. Performance enhancements were achieved by introducing a superior compressor and improved heat exchangers. However, the most influential impact on improved performance was the introduction of a cross-counterflow gas cooler. Results of tests at similar operating conditions, including compressor speed, show an 11% to 63% increase in evaporator capacity and a 1.6% to 6.3% increase in COP. Additional tests performed at similar conditions, high-side pressure, and/or evaporator capacity illustrate COP improvements of 7% to 75%.

Original languageEnglish (US)
Pages (from-to)542-554
Number of pages13
JournalASHRAE Transactions
Volume109 PART 1
StatePublished - Jul 23 2003
EventTechnical and Symposium Papers Presented At the 2003 Winter Meeting of The ASHRAE - Chicago, IL, United States
Duration: Jan 26 2003Jan 29 2003

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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