Numerical investigation of CO2 heat pump water heater performance

Muhamad Yulianto, Takaoki Suzuki, Yoichi Miyaoka, Keisuke Ohno, Niccolo Giannetti, Kiyoshi Saito, Seiichi Yamaguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This study presents a preliminary investigation of the performance of a Heat Pump Water Heater (HPWH) that uses CO2 as refrigerant. The global market of this technology is led by Japan and several units are being installed all around the world under different climates. The main challenge for an efficient spreading of this technology is to maintain the excellent performance of CO2 HPWH under a broad variety of weather conditions. A numerical model was developed to flexibly investigate the performance of the CO2 HPWH under various distributions of inlet air temperature at the evaporator and inlet water temperature_in gas cooler. The simulation results are firstly compared with those from a general pinch point analysis. The Result show that the highest water temperature inlet and lowest air temperature inlet will produce lowest COP and Highest LCCP Contribution

Original languageEnglish
Title of host publication14th IIR Gustav-Lorentzen Conference on Natural Fluids, GL 2020 - Proceedings
PublisherInternational Institute of Refrigeration
Number of pages6
ISBN (Electronic)9782362150401
Publication statusPublished - 2020
Event14th IIR Gustav-Lorentzen Conference on Natural Fluids, GL 2020 - Virtual, Kyoto, Japan
Duration: 2020 Dec 72020 Dec 9

Publication series

NameRefrigeration Science and Technology
ISSN (Print)0151-1637


Conference14th IIR Gustav-Lorentzen Conference on Natural Fluids, GL 2020
CityVirtual, Kyoto


  • Carbon Dioxide
  • COP
  • Energy Consumption
  • Heat Pump Water Heater
  • Weather Condition

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Condensed Matter Physics


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