Using Liquid Nitrogen or Liquid Carbon Dioxide Spray:

Because of the expansion of the industry for the production of oxygen, by liquefaction of atmospheric air, liquid nitrogen has become obtainable almost like a by-product. Therefore, it has come in use for the transport of freezing food. However, it might be noted down that liquid nitrogen contain a normal boiling point of -195.6°C. It is a tremendously low temperature from viewpoint of COP and refrigeration economy. Therefore, Liquid nitrogen is not suggested if this is not available as a by-product.

Eutectic Plates with Station Charging:

Eutectic plates producing channels are located all round the body of the vehicle. They have a eutectic solution that can be frozen by a refrigerant passing in a coil immersed in the solution. The coil is associated to a mechanical refrigeration system on the charging station. Cooling is formed by the evaporation of the prime refrigerant in the coil. While the solution is freezing, the truck loaded along with the product for delivery is ready for leaving.

Eutectic Plates with Vehicle-Mounted Condensing Unit:

This system is becoming progressively popular due to economy and reliability for the transport of freezing foods. Eutectic plates are utilized for keeping the product at the needed temperature. But, while the frozen eutectic has melted, the vehicle-mounted condensing unit might be started. Furthermore, the condensing unit contain an auxiliary drive mounted on the vehicle while this is in use & an electric motor drive for use at the charging station.