Preservation by Cooling and Freezing - Freezing - Ways of freezing
4 important questions on Preservation by Cooling and Freezing - Freezing - Ways of freezing
What's air blast freezing?
used for packaged and not packaged solid products.
Products are placed in cabinets and a heat exchanger blows cold air in the room.
It is met for putting products of different shapes in ther.
Is not very fast.
What's the scraped surface heat exchanger?
It's for liquids that are not contained in a package.
The sureface is scraped so the liquid will not stick to it.
What is air blast freezing using a fluidized bed?
For unpackaged solid products
liquid gas is sprayed over the product so the heat is extracted from the product and the liquid gas can evaporate.
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What's freezing by immersion or spraying?
For packaged and unpackaged foods
liquid gasses (nitrogen, carbion dioxide) is sprayed over a food product
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