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Cooling

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Frequently a freezer may be used for several different products. For such products the above working capacity will have to be multiplied with the capacity factor, which relates the capacity of that particular product to the capacity of the product stated in the design specification. For products with very low capacity factor, the operating conditions usually differ so much that a separate working capacity must be established.

Precooling. Precooling is defined as the cooling of the product before it enters the freezer. The process of precooling has a positive effect on the energy required to freeze a product and generally reduces the frost load on the coils as well. Precooling can be done by blowing ambient air over the product, blowing ambient air that has been evaporatively cooled by water sprays, immersion in cold water (refrigerated or nonrefrigerated), or blowing refrigerated air over the product.

Sanitation during precooling processes is an important consideration because the conveyor system could be at a temperature for all or part of the cycle that can allow bacterial buildup.

Precooling reduces the load on the low-temperature refrigeration system, which reduces the power required by the low-temperature system. If a refrigerated precooler is used, the precooling heat is removed by a refrigeration system that consumes less power per unit of heat removed from the product, and a net power savings is achieved.

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