10. Opening protection

On average, retail stores are closed to the public 60-65% of the time (nights and weekends). During these closed periods, virtually all refrigerated sales units remain loaded with foodstuffs. The main exceptions are certain display cases for unpackaged fragile foodstuffs, which are returned to cold storage or conservation cabinets.

The main thermal stress on the cabinet and its load comes from the opening. This represents 70% to 75% of the heat balance of the open cabinet, and therefore requires an equivalent amount of instant cooling power.

Through the cabinet opening :

direct radiation from the environment is intercepted by visible foodstuffs;
ambient heat and humidity are induced by the air curtain(s) protecting it.

A...

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Opening protection

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Maintenance

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...