Liquid carbon dioxide is taken from a tank, completely evaporated in the
evaporator and fed to the point of use. In order to ensure safe defrosting of the evaporator,
two units connected are operated in parallel. The units are switched over at specific intervals
using a time switch. While one unit is in operation, the other one is being defrosted. The only
energy consumption of this evaporator at temperatures higher than + 5 °C is for the
blowers for air flow through the evaporator.