Development and validation of static simulation model for CO2 heat pump

Seiichi Yamaguchi*, Daisuke Kato, Kiyoshi Saito, Sunao Kawai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


A simulation model for the CO2 heat pump water heater was developed and validated in this study. Component models of the gas cooler, evaporator, compressor, and expansion valve were constructed with careful consideration for the heat transfer performances. To validate the simulation model, experiments were carried out using an actual CO2 heat pump water heater (water heating capacity: 22.3 kW; hot-water temperature: 90 °C). In simulations and experiments, the effects of the inlet water temperature and outside air temperature on the system characteristics were discussed. As a result, the average difference in COP between the simulation results and experimental results is 1.5%.

Original languageEnglish
Pages (from-to)1896-1906
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Issue number9-10
Publication statusPublished - 2011 Apr


  • CO
  • Heat pump
  • Simulation
  • Validation
  • Water heater

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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