The choice of refrigerant for refrigeration units

Refrigeration units of provision storerooms for storage of sausage, ham products and edible animal fats

Section 4

The choice of refrigerant for refrigeration units

Hydrofluorocarbon (HFC) mixture R507 was chosen as a refrigerant for applying in the refrigeration unit. This freon (R507) has zero ozone-depleting potential (ODP=0), besides this refrigerant is  an azeotropic mixture without temperature “glide”.

Hydrofluorocarbon (HFC) mixture, based on hydrofluorocarbons, now replace out-dated refrigerants, based on chlorofluorocarbons (CFC) and hydrochlorofluorocarbons (HCFC).

Both refrigerants are used in the boiling temperature range from −45 to +10°C. Though R404A is a quasi-azeotropic (near-azeotropic) mixture (i.e. it has temperature glide, phase transition temperature difference at a constant pressure is approximately 0.6K). R507, in its turn, behaves as a single-component substance – its liquid and gaseous phases have the same composition, the glide is absent.

Heat-transfer coefficient of azeotropic mixture, as a rule, is higher than the coefficient of nonazeotropic one.

The unit may be filled with refrigerant R507 both in liquid and gaseous form. This refrigerant property enables to fill up the system due to leakages and repair works.

Additionally the diagram of refrigerants mentioned in this article and of other refrigerants, see the section Diagrams of our website.

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