7. Evaporator and refrigerant

The evaporator is one of the major refrigeration components in a refrigeration appliance. It acts as the interface between the refrigeration system, of which it is an essential part (the cold source), and the air circulating in the cabinet. It absorbs heat from various sources and balances the cabinet's overall heat balance by maintaining the application temperature t _i .

Various types of evaporator can be distinguished according to the cold distribution modes used, the most common of which are :

forced convection evaporator for convective cooling ;
natural convection evaporator ;
contact evaporator or "cold plate" for conductive cooling.

These evaporators are supplied...

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Evaporator and refrigerant

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Heat balance

References

(1) - RIGOT (G.) - Meubles et vitrines frigorifiques pour la distribution alimentaire. - 350 p. Pyc Édition France (1990). (Remerciements à l'Éditeur PYC Livres pour son autorisation d'en publier de larges extraits).
(2) - RIGOT (G.) - Load variations for...

Regulations

Order of May 9, 1995 (JO of May 16, 1995) published by AFNOR in the Maîtrise de la chaîne du froid (Cold chain control) compendium.

Standardization

Various technical standards apply to refrigerated display units:

international standards ISO series 5160..., ISO series 1992...
European standards EN 441 series...
French standards series D74...

These various standards can be obtained from AFNOR

Simulation software

Sales refrigeration units installed in food retail outlets are complex thermal and aeraulic machines, operating under variable ambient conditions. They constantly exchange air, heat and humidity with the store's internal environment. The cold production needed to maintain their temperature is cyclically interrupted by defrosting operations. The temperature of the goods on display will be strongly affected by these...