Explain different freezing systems used in food industry.  

Different freezing systems used in food industry:-- 

Contact Freezing

Contact freezers are used for freezing products in bulk and in blocks. The product is filled in trays or pans with water that acts as a freezing media. It gives better contact with freezers plates and gives fast freezing. After freezing product gets embedded inside ice which also acts as a barrier in between product inside and oxygen in the air to arrest putrefactive oxidation and dehydration from dry cold store air. Ammonia (NH3), Freon 104, Carbon dioxide (CO2) gases are generally used as refrigerants in this system.

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