Everybody has a refrigerator at home, isn’t it? We all use it for many purposes in daily life, like preserving vegetables, fruits, dairy products, etc. Then, what is a deep freezer and how can you compare this with a refrigerator in all its working processes and other things?

What is A refrigerator ?

A refrigerator (often called as a “fridge” in short) is a cooling appliance for the storage and preservation of food. It consists of two portions, refrigeration portion and the other one is the freezer portion. The freezer portion is designed to store frozen food, frozen whereas the refrigerator portion of the unit is designed to keep food and dairy products to avoid it from spoiling. The refrigerator is a relatively modern discovery amongst kitchen appliances.

A refrigerator is one of our most valuable household appliances. It keeps food and drinks cool, by pushing a liquid refrigerant through a sealed system, which causes it to vaporize, and draw heat out of the fridge. The vaporized refrigerant then is passed through coils outside the fridge (at the back or the bottom). This warms up the vapour, and changes it back into a liquid.

Talk about a life-changing invention. Refrigerators allow us to easily preserve food, as opposed to the old days, when this was a major chore. Now food that might spoil in a couple hours on the counter, will last a couple weeks in the fridge. This not only makes our lives more convenient, but also helps us stay healthy by reducing the risk of food borne diseases. Lowering the temperature slows down the growth of bacteria significantly. When something is frozen, bacteria growth stops entirely.

What is deep freezer ?

A deep freezer is especially designed only to keep frozen foods frozen. Typically they’re operated at lower temperatures than the freezer because they are used for long term storage. Because of this, the insulation inside of deep freezers is thicker than that of a refrigerator. Most freezers operate around -18 °C (0 °F). Domestic freezers can be used as a compartment in a refrigerator or can be standalone units. Many freezers nowadays come with an icemaker.

It’s easy to say just how easy deep freeze can make your life, but you’re probably asking how exactly it will do that. It is easy to use Deep Freeze and it is as simple as reboot to restore. Unlike the stores, deep freezer never closes and whenever the user needs any food items or the medical organizations need any samples, deep freezers prove to be of utmost importance. When a liquid evaporates it causes the surrounding area to cool. The two main uses for this type of freezer are the freezing of prepacked cartons of fish and fish products for retail sale and the formation of homogeneous rectangular blocks of fish fillets, called laminated blocks, for the preparation of fish portions. Ideal -86ºC freezing environment by means of double insulation walls. To know about the working principle of immersion and spray freezers. ; Pathology, Biochemistry, Hematology, Microbiology Serology, Genetics & Diagnostics.

Difference between deep freezer and refrigerator

Working principle

A vapor compression cycle is used in most freezers. When a liquid evaporates it causes the surrounding area to cool. The basic working principle of a freezer is evaporation. Refrigerators and freezers are now commonplace and every household has one, although Freon is now obsolete. Whether the unit is a small household appliance or a large commercial walk-in area, the cooling system works on the same basic principle of a deep freezer.

Normally, freezers have better insulation properties (R factor) than the freezer compartment of a refrigerator. If you check the temperature of the freezer portion of a refrigerator you’ll find it can be as high as 20F since most are controlled by a single thermostat. Even with dual controls, there is a limit to the temperature difference since the is one compressor and one cooling system. The freezer compartment has a few more cooling coils to provide the difference.

A freezer, on the other hand, doesn’t need dual controls or varying numbers of cooling coils. In most cases, a freezer will keep the temperature between 0 to -10F. In most cases the insulating material in a freezer is the same, just thicker. The compressor is larger with more cooling coils, allowing for greater efficiency when keeping the temperature so low. I have both, and use the refrigerator freezer for short term storage, items to be used within 2 weeks at the most. My freezer is for long term storage, and it is normally 15 degrees colder than the fridge. Just like the difference between a handyman, and a master tradesman, one is a trade-off, the other a specialist.

Temperature

A freezer (usually a part of a refrigerator) is used to preserve foods between 25 and 10 degrees fahrenheit for use usually within a few weeks or months at most. The freezer is a relatively modern invention, only becoming widespread after World War II. A lot of thought should go into how to specify an ultra-low temperature freezer. Upright freezers are perfect for any family home in need of plenty of freezer space or check out our range of chest freezers as well. Biological deep Freezer Safe storage for Biologicals.

Low-temperature laboratory freezers can achieve temperatures of about -40° C or lower. Kitchen freezers, by contrast, operate to about -20° C. The temperature “sweet spot” for lab freezers is about -85° C. “Mechanical” (compressor-based) freezers reach the -40° to -50° C range with a single compressor. A second compressor is required to cool below that point. To achieve energy efficiency and extend the life of the compressors, the low-stage compressor turns off automatically when the set-point temperature is reached, while the high-stage compressor remains on continuously.

Shapes and sizes

The size of the refrigerator is defined in terms of the total internal volume of the refrigerator. They have become one of the most common ways for people to preserve meat and other foods. Deep freezer is just a term for a style of freezer, in that’s it’s generally dedcated as a freezer without a refrigerator section. They are available in different shapes and sizes some may be compact or some may be the regular ones. Household refrigerators are available in various forms and sizes. The specifications and functions of the instruments varies as per the requirements of the test application.

Application

Freezer units are used in households and in industry and commerce. There are numerous types of deep freezers such as blood bank refrigerators, freezer drier, ultra-low deep freezer, deep freezer vertical and many more. Microprocessor temperature control with digital design for precise setting and control. To know the uses of immersion and spray freezer. Deep freezers are also commonly used in several research organizations, medical centers, research laboratories and pharmaceutical industries for storage of blood samples, micro organisms and other chemicals. In this cycle, a circulating refrigerant enters a compressor as low-pressure vapor at or slightly above the temperature of the freezer interior. Most units have both a refrigerator and freezer compartment, but the cooling actually occurs in the freezer, and a fan circulates the cool air into the refrigerator compartment.