Experimental results of transcritical CO2 heat pump for residential application

M. R. Richter, S. M. Song, J. M. Yin, M. H. Kim, C. W. Bullard, P. S. Hrnjak

Research output: Contribution to journalArticlepeer-review


This paper describes experiments comparing a commercially available R410A heat pump and prototype R744 (carbon dioxide) system in heating mode. The R744 system utilizes aluminum microchannel heat exchangers and a prototype semi-hermetic compressor. System performance is compared for two configurations: first, when the R744 compressor speed is set to match the baseline system's heating capacity at 8.2 °C outdoors and 21.1 °C indoors; and second, when the air conditioning capacity is matched at 35 °C outdoors and 26.5 °C indoors. The R744 system operates with a slightly lower heating COP, but its higher capacity at lower outdoor temperatures reduces the need for less efficient supplementary heating capacity.

Original languageEnglish (US)
Pages (from-to)1005-1019
Number of pages15
Issue number10
StatePublished - Aug 2003

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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