How does the system work?

Liquid carbon dioxide is held in a refillable tank mounted under the vehicle chassis. When cooling is demanded by the microprocessor controller, valves open to allow the liquid to flow from the tank into the evaporator coils inside the cargo space. Electric fans circulate air through the coils. As the liquid evaporates, it cools the coil and the air passing over it. Cool air is thus circulated through the cargo maintaining the temperature set-point. Having cooled the coil and the air, the gas is directed outside the vehicle body into the atmosphere.

Importantly, the gas never enters the cargo space and the load temperature and humidity are controlled by airflow. Other cryogenic systems inject refrigerant gas into the load space creating potential safety hazards and failing to control humidity in fresh produce.

The new SR-3 CryoTech controller provides improved electronic features to ensure tight and accurate temperature control, thus protecting the load, maximising up-time and reducing operating costs. New telematics features support data transfer and management to provide the information needed to ensure optimum use of the CryoTech system.

Accurate temperature management and defrost require heating as well as cooling. On trailer applications, it is provided by a small diesel heater. On truck applications, vehicle engine coolant is used to deliver heating on the road, while an electric heater coil is used on electric standby.