CO2 Combined Temp Cascade Refrigeration | Second Nature SNMT2LX

Second Nature - SNMT2LX CO2

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Second Nature - SNMT2LX CO2

Second Nature - SNMT2LX CO2

Second Nature - SNMT2LX CO2

Second Nature - SNMT2LX CO2

SNMT2LX – CO2 Combined Cascade Refrigeration System

Second Nature medium-temperature secondary with CO2 low-temperature cascade system. Sharing a common, medium-temperature primary system, the SNMT2LX system combines a CO2 medium-temperature secondary system (SNMT2) with a CO2 low-temperature cascade system (SNLTX2) to further reduce refrigerant charge and consolidate duplicate components. Evaporator control uses Hillphoenix SmartValve™ technology with electronic expansion valves (EEV) on low-temperature and simple solenoid valve control on medium-temperature.

SNMT2LX – CO2 Combined System Technology

• CO2 is a “natural refrigerant” that is non-ozone-depleting (ODP=0) with almost no global warming potential (GWP=1).
• CO2 as a two-phase secondary coolant dramatically lowering flow rates and pumping power.
• More efficient than conventional HFC systems in some climates.
• A less expensive alternative to HFC refrigerants.
• An excellent way to help achieve GreenChill Platinum-Level Certification.
• CO2 transcritical systems have proven themselves in thousands of installations throughout Europe.

Second Nature - SNMT2LX CO2

Refrigeration Regulations - Are you ready?

Second Nature - SNMT2LX CO2

Second Nature - SNMT2LX CO2

Features & Benefits

  • Second Nature® SNMT2LX system utilizes CO2 as a secondary coolant for the medium-temperature system, and CO2 as a direct expansion cascade refrigerant for the low-temperature system.
  • A CO2 pump, typically installed as a primary pump with a parallel backup pump, delivers liquid CO2 through the supply distribution piping to both the low- and medium-temperature evaporators.
  • Low-temperature evaporators designed specifically for CO2 direct expansion operation.
  • CO2 as a direct expansion refrigerant with better heat transfer properties compared to conventional HFCs.
  • Medium-temperature evaporators designed for fully flooded CO2 secondary operation.
  • The low-temperature display cases and freezers are equipped with the Hillphoenix Smart Valve™ system with EEV’s for steady, automatic control of superheat leaving the evaporators.
  • Medium-temperature display cases and coolers are equipped with solenoid valves which control the flow of CO2 into the evaporators.

Benefits of Using Second Nature CO2 Technology

  • CO2 is considered a natural refrigerant with very low global warming potential (GWP=1).
  • CO2 is an inexpensive refrigerant, compared with HFC, and is widely available.
  • In excess of 70 percent reduction in HFC refrigerant charge can be achieved. The entire primary refrigerant charge is confined to the machine room and condenser to enable simple leak detection and servicing.
  • The piping system utilizes a modified loop copper piping system – CO2 lines are typically one to two sizes smaller than traditional DX piping systems.
  • Excellent material compatibility – most equipment for commercial refrigeration can be used.
  • Medium-temperature system uses CO2 as a two-phase secondary coolant taking advantage of CO2’s high latent heat capacity – this dramatically lowers flow rates (typical 90% reduction) and pumping power compared to conventional secondary fluids (e.g. glycols).
  • System energy performance equivalent or better than conventional HFC systems.
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