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Brine immersion freezers have been used on fishing vessels, but there has been a recent trend towards air blast freezers. Brine immersion freezers work by totally immersing the fish in brine until it is frozen. The amount of salt absorbed by the fish is small. This method is ideally suitable for freezing unpackaged fish and shrimp on vessels.
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What You'll Learn
- Freezers for use at sea should be designed for short freezing times
- The quicker the freeze, the smaller the freezer
- Brine immersion freezers are used to freeze unpackaged fish and shrimp
- The transfer of heat from fish to a surrounding cold liquid is better than from a fish to cold air
- There has been a recent trend toward air blast freezers
Freezers for use at sea should be designed for short freezing times
Brine immersion freezers have been used but there has been a recent trend toward air blast freezers for this purpose. The amount of salt absorbed by the fish is small and may be allowed for when the method of freezing is to totally immerse the fish in the brine until the fish is frozen. This has limited application, but the next freezer could be said to be a modification of this method and has a wider use. Immersion freezers are ideally suitable for freezing unpackaged fish and shrimp on vessels. The transfer of heat from fish to a surrounding cold liquid is better than from a fish to cold air, as in a blast freezer. There is also no chance of freezer burn.
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The quicker the freeze, the smaller the freezer
Space on a fishing vessel is limited, especially the height available between decks. Freezers for use at sea should therefore be designed for short freezing times, taking into account the refrigerant operating conditions, the product shape and size, and the space available.
For example, large fish like tuna are frozen individually using brine immersion freezers. This method is ideal for freezing unpackaged fish and shrimp on a vessel because the transfer of heat from the fish to the surrounding cold liquid is more efficient than freezing with cold air, as in a blast freezer. Additionally, there is no chance of freezer burn with brine immersion. However, brine immersion freezers have limited applications, and there has been a recent trend towards air blast freezers for freezing fish.
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Brine immersion freezers are used to freeze unpackaged fish and shrimp
The amount of salt absorbed by the fish is small and may be allowed for when the method of freezing is to totally immerse the fish in the brine until the fish is frozen. This has limited application, but the next freezer could be said to be a modification of this method and has a wider use.
Space on a fishing vessel is limited, especially the height available between decks. Freezer designs and layout should therefore be made to suit this space restriction. The quicker the freeze, the smaller is the size of a freezer for a given capacity. Freezers for use at sea should therefore be designed for short freezing times, taking into account both the refrigerant operating conditions and the product shape and size. Large fish like tuna are frozen individually. Brine immersion freezers have been used but there has been a recent trend toward air blast freezers for this purpose. Shell-on shrimp and other shellfish are also frozen individually, but apart from these few exceptions, freezers for IQF products are unlikely to be required on a fishing vessel.
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The transfer of heat from fish to a surrounding cold liquid is better than from a fish to cold air
Freezing fish at sea is a challenge due to the limited space available on fishing vessels. Freezers used on fishing boats are therefore designed for short freezing times and to accommodate the size and shape of the fish.
One type of freezer used on fishing vessels is the brine immersion freezer, where fish are totally immersed in brine until frozen. The amount of salt absorbed by the fish is small, and the transfer of heat from the fish to the surrounding cold liquid is better than from a fish to cold air, as in a blast freezer. This method also has the benefit of no chance of freezer burn.
However, there has been a recent trend towards air blast freezers for freezing fish at sea. This is because the quicker the freeze, the smaller the size of the freezer for a given capacity.
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There has been a recent trend toward air blast freezers
Air blast freezers are preferable to brine immersion freezers because the transfer of heat from fish to cold air is better than from fish to a surrounding cold liquid. There is also no chance of freezer burn with air blast freezers.
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Frequently asked questions
A brine freezer is a highly efficient method of freezing food, which is achieved by using a salt/water solution. The solution is kept at very low temperatures of around zero degrees Fahrenheit without freezing. Food placed inside the solution will immediately begin to freeze.
Liquids flow over the freezing product and circulate through a heat exchanger. Passing through the exchanger allows liquids to give up the captured heat to the vaporizing refrigerant. The cold brine is then pumped into sprayer or immersion tanks where the freezing product loses heat.
Brine freezers are useful because they can be kept at very low temperatures without freezing. They are also the most efficient and economical system for freezing shrimp and other seafood. They are also useful for freezing unpackaged fish and shrimp on vessels.
