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Types of freezer. Air Blast Freezers- Blowing a continuous stream of cold air over the fish. Contact or Plate Freezers-Direct contact between the fish.

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Presentation on theme: "Types of freezer. Air Blast Freezers- Blowing a continuous stream of cold air over the fish. Contact or Plate Freezers-Direct contact between the fish."— Presentation transcript:

1 Types of freezer

2 Air Blast Freezers- Blowing a continuous stream of cold air over the fish. Contact or Plate Freezers-Direct contact between the fish and a refrigerated surface- Immersion in or spraying with a refrigerated liquid-immersion or spray freezers

3 Air-Blast freezers It can cope with a variety of irregularly shaped products and whenever there is a wide range of shapes and sizes to be frozen, the blast freezer is the best choice.

4 Continuous belt freezers Continuous belt freezers can be constructed with either cross-flow or series flow air circulation. Fluidized and semi-fluidized freezers Product with a strong blast of air from below. The product then behaves like a fluid and when poured into the trough at the input, it moves along the length of the freezer without mechanical assistance and over-flows at the output.

5 Plate freezers Modern plate freezers have their plates constructed from extruded sections of aluminium alloy arranged in such a manner as to allow the refrigerant to flow through the plate and thus provide heat transfer surfaces on both sides.

6 Vertical plate freezers Fish can be frozen in bulk without the requirement to package or arrange on trays. Liquid Nitrogen Freezer-Cryogenic freezing The freezer is operated without the need for compressors, condensers or coolers; therefore maintenance requirements are minimal and the power required to operate the freezer is very low.

7 Carbon Dioxide freezer The liquefied carbon dioxide is injected into the freezer has direct contact with the product. Immersion Freezers Liquid refrigerant is used for the removal of heat from a product.


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