Several fish, meats, fruits,
and vegetables are perishable, and their storage life might be extended by
refrigeration. Fruits, several vegetables and processed meat, like sausages,
are stored up at temperatures just somewhat above freezing to extend their
life. Other, fish, vegetables, meats & fruits are frozen and stored up many
months at low temperatures till they are defrosted & cooked by the
consumer.It is very important topic in Refrigeration and Air Conditioning assignment help.
The frozen-food chain usually
consists of the following links: freezing, storage in refrigerated warehouses, present
in a refrigerated case at food markets, and at last storage in the home freezer
or frozen-food compartment of a domestic refrigerator.
Food Freezing
Early effort to freeze food
resulted in a product laced along ice crystals till it was discovered that the
temperature ought to be plunged quickly through the freezing zone. Approaches
to freezing food involve air-blast freezing, where air at about – 30 °C is
blown having high velocity over packages of food stacked on fork-lift pallets;
contact freezing, where the food is placed among metal plates & surfaces;
immersion freezing, where the food is placed in a low-temperature brine;
fluidized-bed freezing, where the specific particles are carried along a
conveyor belt and hold in suspension by an upward-directed stream of cold air &
freezing along a cryogenic substance like nitrogen or carbon dioxide.
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