Refrigeration, Freezing and Cold-Storage Equipment
Refrigerators, freezers, cold rooms, evaporators and rapid-freezing systems used to remove heat and maintain controlled low-temperature storage.
Holding refrigerators, cold rooms, blast chillers and freezers serve different purposes. Storage equipment may be unable to remove a large warm load within the required time.
Product mass, starting temperature, packaging, door openings, ambient heat and evaporator condition determine load. Nameplate volume is not usable cooling capacity.
Fans, shelves, pallets and tightly packed cartons create warm and cold zones. Product near coils can freeze while sheltered positions remain too warm.
Rapid systems limit ice-crystal damage, but freezing does not eliminate all pathogens. Dehydration, oxidation and temperature fluctuation still require packaging and storage control.
Ice, blocked coils, failed seals, condensate and refrigerant faults reduce performance and create hygiene issues. Defrost cycles can cause temporary excursions that should be understood.
Map representative loads, monitor product or validated surrogate positions, test alarms and define response to failure. Hold product when time-temperature history is incomplete.
References
- https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/freezing-and-food-safety
- https://www.fda.gov/food/fda-food-code/food-code-2022
- https://www.fao.org/fao-who-codexalimentarius/codex-texts/codes-of-practice/en/