High-Efficiency CO2 Heat Pump Water Heater Systems for Residential and Non-Residential Buildings

The article shows that a heat pump water heater system using carbon dioxide (CO2, R744) as working fluid will typically achieve 20% higher COP than the most energy-efficient HPWH system on the market using HFC or propane as working fluid. In terms of energy efficiency and utilization of renewable heat it even outperforms state-of-the-art solar heating systems. Air-to-water and water-to-water CO2 HPWH in the capacity range from about 5 to 60 kW have now become commercially a

The article shows that a heat pump water heater system using carbon dioxide (CO2, R744) as working fluid will typically achieve 20% higher COP than the most energy-efficient HPWH system on the market using HFC or propane as working fluid. In terms of energy efficiency and utilization of renewable heat it even outperforms state-of-the-art solar heating systems. Air-to-water and water-to-water CO2 HPWH in the capacity range from about 5 to 60 kW have now become commercially available in Japan and Europe from a number of Japanese manufacturers.


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