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The image shows a fridge or a refrigerator, viewed on the left rear and on the right front.

The refrigerator is an installation that uses electricity to produce coldness in a closet where perishable food is stored, and that is usually called a fridge or to freeze water in a smaller compartment above, called a freezer.

The outer shell of the refrigerator is represented by a dotted texture and has the shape of a vertical rectangle, with rounded corners.

To keep the temperature lower than the ambient temperature, when the refrigerator door is open and closed, the machine uses a refrigerant, a substance that can absorb heat and maintain the low temperature, by undergoing phase transitions from a liquid to a gas and back again.

The low temperature desired for the food to be cooled is manually adjusted by a wheel on the inner side wall, called a thermostat.

On the left is the electrical installation that can be seen from behind the refrigerator, rendered by a comb shape, blank, with the shaft on the right side, thin and vertical, stretched on the height of the refrigerator and its tooth, in the shape of blank and thick lines, horizontal, elongated across the width of the fridge.

This comb shaped component is represented by the condenser, a network of liquefaction pipes, mounted externally on the back of the refrigerator, whose temperature is high and which is connected to a compressor.

The electric motor compressor, marked embossed at the bottom center, under the condenser, is electrically operated and transfers kinetic energy to the refrigerator in exchange for the electricity used to push the refrigerant up where the cooling circuit is located.

The entire heat circuit is always made from hot to cold, from the very hot bottom compressor to the cooling circuit at the top, where the evaporator and the suction tube are located.

Thus, the heat inside the fridge is suctioned upwards by the refrigerant, flowing through the left side capillary tube to the suction tube above.

In the right image is illustrated the inside of the refrigerator made of a larger compartment, with several glass shelves and a crisper, in the shape of a rectangular basket, at the bottom of the refrigerator, used for storing fruit and vegetables.

At the top is located a small freezer, rendered by a horizontal rectangle filled with dotted texture and a handle marked by a thickened vertical line on the left.

The lower refrigeration area is illustrated from the inside, with the door open to the right side, with the shelves rendered by three horizontal and parallel lines, next to the crisper box, highlighted embossed, below.

On the refrigerator door, right edge, are fixed narrow shelves, rendered by horizontal rectangles, embossed and parallel, the last bottom shelf being for storing taller bottles and cans.

The door is closed magnetically by a strip on the outer edge of the door, called a magnetic door gasket.

General information

Preservation is the process by which perishable foods remain good for consumption for a longer period, compared to unpreserved foods. Solutions for food preservation date back to antiquity. Most commonly, people slowed the alteration of food by boiling, frying or smoking, but cellars were also dug which, by the lower temperatures, kept the food in a consumable state for longer.  

By preservation, it slows down fermentation, oxidation or excessive drying of food and thus they retain their initial qualities for a longer time.

One of the modern methods of preservation is the freezing of food. In most households, grocery stores, but also food warehouses, refrigeration appliances of various kinds are used. In addition, there are mobile refrigeration appliances that provide the transport of perishable food over very long distances. Without these mobile refrigeration appliances, it would not be possible to import fruit not found in a particular country. For example, bananas and oranges are brought to our country with the help of refrigerated trucks.

If at first the devices that converted electricity into heat appeared, in 1922 appears the first refrigerator with a compressor that used the electric current for cooling. As a cooling substance (refrigerators) was used freon, a toxic gas that today is no longer used, but the principle of operation of refrigerators remained the same. Pressure gases tend to liquefy, i.e. to turn into liquid. For example, the liquefaction process takes place when filling gas cylinders. During liquefaction, heat is released, and in case of inversion of the process, that is during vaporization, when the liquid becomes gas, heat is absorbed. In the case of a refrigerator, the compressor pressurizes the refrigerant gas, usually propane, in a container, to the point where it liquefies. After compression, the liquefied refrigerant (cooling) gas is recirculated through some tubes of different dimensions. When the gas leaves the thinner tubes and reaches the larger diameter tubes, it is suddenly decompressed, and after depressurization it cools and absorbs heat from inside the refrigerator. All this depressurization and sudden vaporization also occurs during the use of a spray deodorant, when the gas inside the container is released suddenly. This sudden decompression causes the surface over which the substance in the container is sprayed to cool. 

Did you know that there were big, very profitable businesses that were based on the collection and distribution of natural ice? In short, the ice was brought by boat from where it was naturally found, and it was sold in places where the ice was not found. Basically, people were making a profit, moving frozen water from one place to another.

We very often use the term refrigerator. Did you know that this comes from Frigidaire, the name of a home appliance company?



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