Numerical analysis on a microchannel evaporator designed for CO2 air-conditioning systems

Rin Yun, Yongchan Kim, Chasik Park

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


A microchannel heat exchanger was numerically analyzed using the finite volume method. The air and refrigerant-side heat transfer coefficients and pressure drops were calculated using the existing correlations that were developed for microchannel heat exchangers. To verify the present model, performance tests of the microchannel heat exchanger were conducted at various test conditions with R134a. The present model yielded a good correlation with the measured heat transfer rate, demonstrating a mean deviation of 6.8%. The performance of the microchannel evaporator for CO2 systems can be improved by varying the refrigerant flow rate to each slab and changing fin space to increase the two-phase region in the microchannel. Based on the comparison of the performance of the microchannel heat exchanger with that of the fin-tube heat exchanger designed for CO2 systems, it was proposed that the arrangement of the slabs and inlet air velocity in the microchannel heat exchanger need to be optimized by considering heat exchanger size, air outlet conditions and required capacity.

Original languageEnglish
Pages (from-to)1320-1326
Number of pages7
JournalApplied Thermal Engineering
Issue number8-9
Publication statusPublished - 2007 Jun

Bibliographical note

Funding Information:
This work was supported by Grant No. R01-2006-000-11014-0 from the Basic Research Program of the Korea Science and Engineering Foundation.


  • CO
  • Design
  • Evaporator
  • Microchannel heat exchanger
  • Modeling

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


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