TALOSⓇ S80

CO₂ Subcritical Systems

Carbon dioxide (CO₂) is a naturally occurring substance in the atmosphere and it has been used as refrigerant since the early days of refrigeration. CO₂ has zero ODP and a GWP of 1, making it one of the best choices from an environmental perspective. Due to thermodynamic properties, CO₂ systems require high operating pressures in order to operate efficiently.  CO₂ has a low critical temperature and high pressure 31°C and 73.8bar respectively. 

CO₂ refrigeration cycles can be transcritical as well as subcritical. Transcritical and subcritical refers to the high-pressure side of the systems, as it operates above or below the critical point, respectively. Transcritical refers to the state of the refrigerant above the critical point.

The design pressure of CO₂ systems depends on the corresponding component refrigerant state. A design pressure of 80bar is sufficient for components in contact with non-transcritical CO₂ at working and standstill conditions. 

TALOS^Ⓡ S80

TALOS^Ⓡ S80 tubes are specifically designed for an operation pressure of up to 80bar. In order to meet the high-pressure CO₂ requirements TALOS^ⓇS80 tubes are manufactured with reinforced wall thicknesses in comparison with TALOS^Ⓡ ACR.

TALOS^Ⓡ S80 can be used where the system’s design pressure does not exceed 80bar, i.e. where the CO₂ is not supercritical. In practice, this occurs at both high and low pressure sides in subcritical cycles and at the low pressure side of transcritical cycles.

The well-known installation practices of refrigeration copper tubes apply both in systems and in the field (see relative EN378 standard for guidelines).