Building on the pioneering legacy of the refrigerated container shipping industry’s first controlled-atmosphere system 25 years ago, Carrier Transicold recently developed the next-generation EverFRESH system, which it says makes premium performance more affordable than ever for fleets and container leasing companies.
Using active controlled-atmosphere technology, the EverFRESH system optimizes the balance of oxygen and carbon dioxide within a refrigerated container, slowing respiration and the natural ripening of the commodity inside. Thus, it helps to preserve the quality of perishables beyond what refrigeration alone can do, the company claimed. As an active system, it generates high-purity nitrogen to more quickly and responsively displace oxygen, rather than relying on respiration alone to gradually reduce oxygen levels.
“The active nature of the EverFRESH system can handle a broader range of perishable commodities than modified controlled-atmosphere systems, making it a more versatile choice for many customers,” said Jim Taeckens, senior product manager for global container refrigeration at Carrier Transicold.
“Another key benefit of the EverFRESH system’s active technology is that it maintains a positive air pressure within the container, making it far less sensitive to box leakage than other types of systems.”
Key components are a sensor package, nitrogen membrane separator, air compressor and air filters. In use, the compressor pulls fresh air into the system, which then removes water vapor from the compressed air stream before it enters the membrane separator. The hollow-fiber media of the separator extracts oxygen and captures carbon dioxide, discharging concentrated nitrogen into the container. If supplemental oxygen is needed, the membrane can be bypassed. The EverFRESH system can independently maintain oxygen at user-selected levels between 3% and 17%, and carbon dioxide at between 2% and 19%.
Optional ethylene absorbers can be added for perishables where elevated levels of the hormone are a concern.
All EverFRESH systems have pre-trip inspection routines that test the membrane and compressor to make sure they are functioning normally prior to use.
The new EverFRESH system will be available in early 2020 for Carrier Transicold PrimeLINE refrigeration systems equipped with the Micro-Link 5 controller option, the company said.
“Carrier Transicold was the first to introduce the container shipping industry to the advantages of controlled-atmosphere shipping with our EverFRESH system,” Taeckens said. “While the original design had a very strong following, the costs associated with its components and associated controls limited its adoption. Today, our technology has improved to the point that we are pleased to be able to offer an active system that is significantly more affordable. It is also much less complex and easier to service than competitive systems.”
With the new EverFRESH system, Carrier Transicold now offers customers a choice of two controlled atmosphere options, including the XtendFRESH, a modified system that uses a scrubber to remove carbon dioxide and ethylene from atmospheres within a container.
For more information about the EverFRESH controlled-atmosphere system, visit transicold.carrier.com.