Air blow temperature
The principle of Blast Chilling and deep freezing in mechanical refrigeration is based on the temperature difference between the product and the air blowed. The more the temperature difference will be, the shortest the cycle will be. In Blast Chilling as in Deep Freezing, a cell should be able to produce a negative air blow temperature.
The air speed allows the indispensable heat exchange for a product blast chilling.
The more a product will be ventilated, the more its chilling will be fast. In the case of a blast chilling done by an air blow below zero, it is so necessary to provide the same blow for all the products, at the risk of causing an inadvertent deep freezing of the first chilled products.