Today, the increase in demand for fresh and naturally consumed foods has increased the importance
of cold storage among food preservation methods. During cold storage, chemical reactions and
enzymatic activities in food are delayed, the growth rates of microorganisms and activities are
slowed down, so the duration of foods is longer.
The temperature ranges required for freshly frozen foods in cold storage ranges from -1 ° C to + 10 °
C. Factors that affect food safety and quality during cold storage of food include:
• Ambient temperature
• Characteristics of food
• Environmental relative humidity
• Composition of ambient atmosphere
• Operations applied to the product before storage
• Duration

During frozen storage (-18 ° C and below), important microbial activities are completely stopped in
terms of food safety, and microorganism numbers are decreasing. Freezer has a lethal effect on
parasites. Among the processed products, frozen products are the closest to their taste. According to
a study done, energy consumption per ton of frozen products is lower than canned food.
The following methods for freezing the foods are selected depending on the type of product, quality,
and the speed of freezing. Also, the choice and location of the shock evaporators equipped with fans
providing high pressure and high outflow air is also important in terms of freezing operation.
In a well-designed shock-freezer, the air velocity over the product must be the same throughout the
tunnel. This ensures that all products are frozen equally.
Controlled Atmospheric Storage
The oxygen level of the ambient atmosphere is drawn from 5% to 0,1% in 21% of specially designed
fully sealed leaktight storage, as well as providing all necessary conditions for cooling, as well as
protection of the quality as possible during cold storage of fruit vegetables; carbon dioxide level is
increased to 1% to 5% levels. The remainder is complemented by nitrogen (N2). Controlled
atmospheric storage increases storage time by 50% to 100%, depending on the product, compared to
cold storage.