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Technical information Food refrigeration and freezing Cryogenic fluids

Cryogenic liquids

Some of freezing processes the use of cryogenic liquids, usually liquid nitrogen to achieve very fast low-temperature freezing. It is particularly suitable for small-scale industries in the early stages of product and process development, as capital costs for nitrogen freezer is very low compared to mechanical refrigeration, and the system is easy to assemble, modify, add and move as the development progresses. Nitrogen freezers may require less space than a mechanical refrigeration system, which makes them easier to set up on a trial basis. However, liquid nitrogen costs are high, as nitrogen production process is energy intensive.

As energy costs rise from the use of liquid nitrogen becomes less attractive investment payback period in refrigeration plants is becoming shorter. If there is not enough space at the factory of mechanical freezer, the user may be blocked in some very expensive production process once the product is installed. Some attention should be paid to the process of development, when the initial test established.

Most of the equipment required for nitrogen freezer for rent nitrogen proposals of the company, and it may be necessary to obligations under the supply agreement or the minimum amount of nitrogen or the minimum period of time to recoup's supply costs.

Carbon dioxide is also used for certain types of products, although it forms dry powder when the liquid is sprayed into the atmosphere, which limits its application. It is also possible to use synthetic liquefied air (SLA), which has the advantage of maintaining a safe atmosphere without danger of starvation. However, SLA more expensive than liquid nitrogen, which makes it less and less attractive as energy prices rise.

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