CO2 Vending Machines

This paper describes CO2 compressors and systems for light commercial refrigeration applications such as vending machines. The natural refrigerant CO2 (R-744) has the potential to replace HFC-based applications, as it has no Ozone Depletion Potential (ODP) and a negligible Global Warming Potential (GWP) of just 1. Furthermore, as CO2 features better efficiency for heating, Heat Pump Water Heaters (HPWH) using CO2 refrigerant have been sold in Japan sin

This paper describes CO2 compressors and systems for light commercial refrigeration applications such as vending machines. The natural refrigerant CO2 (R-744) has the potential to replace HFC-based applications, as it has no Ozone Depletion Potential (ODP) and a negligible Global Warming Potential (GWP) of just 1. Furthermore, as CO2 features better efficiency for heating, Heat Pump Water Heaters (HPWH) using CO2 refrigerant have been sold in Japan since 2001. The main challenge to apply CO2 for refrigeration applications was its lower theoretical efficiency and the fact that CO2 systems operate at 3 to 5 times higher working pressure than the conventional HCFC and HFC-based systems. Sanyo’s rotary 2-stage compressor developed for HPWH was applied to refrigeration applications with suction line heat exchangers and intercoolers to address the lower efficiency. As a result, lower indirect emissions were attained as well as lower direct emissions with no ODP and negligible GWP.


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