Figure 25. Refrigeration capacity as a function of evaporation temperature.

With the help of an automatic process control system it is possible to improve the efficiency of a refrigeration installation, including the operation of the freezing equipment.

Figure 27 illustrates a typical example of how a process line is shown on a data screen being part of an automatic process control system.

Cryogenic Refrigeration Systems

The second refrigeration process of importance for the food industry is the cryogenic system. In contrast to the mechanical refrigeration system described above, the cryogenic system is open, which means that the refrigerant is consumed and not recirculated. Liquid nitrogen or liquid

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