When we pronounce a word refrigerator, an image instantly appears in our minds household appliance that keeps food fresh. This is such a common phenomenon that few people think about what exactly this technology is called and where the name itself came from. Meanwhile, this simple word hides a complex history of engineering and linguistic transformations.
In the everyday sense, this is a device for cooling and storing food, but from the point of view of physics, it is heat pumpthat transfers heat from the inner chamber to the outside. That is why the back wall of the device is always hot. Understanding what a refrigerator actually is will help you better operate your equipment and save energy.
The word “refrigerator” in Russian is derived from the adjective “cold”. However, history also knows other names that were used before the widespread use of electric models. For example, the term “glacier” or “ice chamber” was used for a long time, which directly indicated the source of cold - natural ice.
Etymology and history of the term
Linguistic analysis shows that the word refrigerator is formed using the suffix -ilnik-, which often indicates an instrument or place of action. In the Old Russian language there was a word “cold”, which meant not only low temperature, but also a state of chills. The first devices for preserving food were called “cellars” or “glaciers.”
With the development of technology in the 19th century, when the first mechanical installations appeared, a new name was required. The term “refrigeration machine” became a technical standard, and the diminutive “refrigerator” became established in everyday life later, when the units became compact and affordable for ordinary families.
It is interesting that the logic (names) differed in different languages. The English language uses the word refrigeratorderived from the Latin frigus (cold), which literally means “cooling.” In German - Kühlschrank, which translates as “cooling cabinet.”
The modern understanding of the term includes not only the cabinet itself with food, but also a complex refrigerant circulation system. Without understanding the etymology, it is difficult to imagine how far technology has come from a simple ice box.
- ❄️ The word comes from the root “cold” with the addition of an instrumental suffix.
- ⏳ Early analogues were called “glaciers” and required a constant supply of ice.
- 🌍 In different languages, the accent is done either in the cold or on the functions of the cabinet.
⚠️ Attention: In technical documentation and manuals the term “refrigerator” or “refrigeration unit” is often used, which is more accurate from an engineering point of view than the household “refrigerator”.
Physical principle: how it works
To understand what a word is refrigerator from the point of view of physics, you need to forget about creating cold. Cold is not created, heat is removed. The basis of the work is the cycle of compression and expansion of gas, which is called a refrigerant. Most often today, safe freons are used, such as R600a.
The process begins in the compressor, which compresses the refrigerant gas, increasing its temperature and pressure. The hot gas then flows into the condenser (the black radiator at the back), where it cools and turns into a liquid, releasing heat into the room. This explains why the kitchen is warm while the appliances are running.
Next, the liquid refrigerant passes through a capillary tube or thermostatic valvewhere it expands sharply. When expanding, the temperature of a substance drops to very low values. In the evaporator (inside the chambers), the refrigerant boils, actively absorbing heat from the products.
After the evaporator, the gas returns to the compressor again, and the cycle repeats. Modern models are equipped with inverter compressorsinverter compressors
It is important to note the role of insulation. The walls of the refrigerator are filled with polyurethane foam, which prevents the penetration of heat from the outside. Violation of the tightness of the door seal nullifies the entire work of a complex physical system.
- 🔄 The refrigerant circulates in a closed circuit, changing the state of aggregation.
- 🔥 The condenser is always hotter than the environment, as it gives off heat.
- 🧊 The evaporator inside the chambers is always colder than the food to take away the heat.
⚠️ Attention: Never try to replace the refrigerant yourself or solder the pipes without evacuating the system. Residual moisture in the tubes will lead to instant failure of the compressor.
Main units and components of the device
Understanding what the word means refrigerator structurally, we see a set of interconnected units. The main heart is the compressor. It is he who creates pressure in the system. There are piston, linear and rotary models. Whether there will be cold in the house depends on its serviceability.
The second important element is the control system. In older models, this is mechanical thermostat, which opens the contacts when the desired temperature is reached. In modern devices, everything is monitored by an electronic control module and a network of sensors (thermistors) scattered throughout the chambers.
The third component is the evaporator. In systems No Frost it is hidden behind a plastic panel and is blown by a fan. In drip systems (“crying wall”), the evaporator is the rear wall of the main chamber. Understanding the type of system is important for proper defrosting.
Why does the refrigerator hum?
The hum can come from compressor vibration, improper installation (shipping bolts or legs are not unscrewed) or tube resonance. If a new refrigerator is humming, let the oil in the compressor settle for 2-3 hours before turning it on.
Also (cannot be ignored) is the role of door seals. Magnetic tape around the perimeter ensures a tight fit. If it is dirty or damaged, warm, moist air will flow inside, causing ice to freeze.
For defrosting, No Frost systems use Heating elements (tubular electric heaters), which are turned on by a timer or compressor operation counter, melting the ice on a hidden evaporator. Water flows into a special tray above the compressor and evaporates.
| Component | Function | Location |
|---|---|---|
| Compressor | Compression and pumping of refrigerant | Bottom rear (usually) |
| Condenser | Gas cooling and condensation | Rear grille or in the walls |
| Evaporator | Heat absorption (cooling) | Inside the chambers or behind the panel |
| Filter drier | Removing moisture from freon | At the outlet of the condenser |
Classification: types of refrigerators
The word refrigerator combines a huge variety of devices. First of all, they are divided according to the method of defrosting. Systems Direct Cool (drip) require manual defrosting of the freezer once every six months, but retain the natural moisture of the food.
Systems No Frost ("without frost") are fully automated. They don't require defrosting, but can dry out food more if you don't package it. There are also combined systems, for example Full No Frost, where both chambers operate using forced circulation technology.
By type of installation, built-in and free-standing models are distinguished. Built-in appliances require special furniture niches and facade ventilation systems. Freestanding ones are easier to install, but take up space in the kitchen.
☑️ Check before purchasing
Climatic classification is also important. It is indicated by letters SN, N, ST, T and indicates the range of ambient temperatures at which the device operates effectively. Installing a class N device in an unheated garage in winter will lead to freezing of the oil in the compressor.
- 🏠 Built-in models require accurate calculation of the niche dimensions.
- 💨 No Frost is convenient, but takes up more internal volume.
- 🌡️ Climatic the class must correspond to the temperature in the room.
Energy efficiency and modern technologies
In the modern world, the word refrigerator is inextricably linked with the concept of energy consumption. The energy efficiency class is designated by letters from A to G (in the new European Union standards) or A+...A+++. The higher the class, the less electricity the device “eats.”
Modern technologies include zones Fresh Zone or “zero chambers”, where the temperature is maintained at about 0°C and high humidity. This allows you to store meat and fish without freezing much longer than in the main chamber.
Smart refrigerators (Smart Home) are equipped with Wi-Fi modules. They can notify the owner via smartphone if the door is left open, or order groceries themselves. However, for the basic function of storing food, these functions are not critical.
An important aspect is the use of environmentally friendly refrigerants. Old freons R12 destroyed the ozone layer, modern ones R600a (isobutane) are environmentally friendly, but are fire hazards at high concentrations, which requires caution during repairs.
⚠️ Attention: When purchasing, pay attention to the noise level. For a kitchen-living room, an indicator of up to 38-40 dB is considered optimal. Louder models can create discomfort when watching TV.
Frequent operating errors
Improper use shortens the life of the equipment. The most common mistake is installing hot products. This creates extreme stress on compressor and leads to premature wear. The food needs to be cooled to room temperature.
The second mistake is filling the chambers with food to capacity. To circulate cold air (especially in No Frost), free air flow is necessary. If you close the ventilation holes, the temperature in different corners of the chamber will differ greatly.
The third problem is infrequent washing of the condenser. Dust settling on the rear grille acts as a heat insulator, preventing heat from being lost. The compressor is forced to work longer to reach the set temperature.
Users also often ignore door misalignment. If the refrigerator is not level, the door may not close on its own, or the seal will not fit tightly. Adjusting the legs is a simple procedure that must be performed during installation.
- 🚫 Do not place the device next to a radiator or stove without thermal insulation.
- 🧼 Once a year, vacuum the rear grille to remove dust and hair.
- ⚖️ Check the horizontal installation construction level.
FAQ: Frequently asked questions
Why does the refrigerator sometimes make gurgling or clicking sounds?
Gurgling is the sound of refrigerant flowing through the pipes, which is a normal operating process. The clicking sound is most often produced by the thermostat (in older models) or the heater automatically defrosts. If clicks are not accompanied by loss of cold, this is normal.
How often should you defrost a refrigerator with a No Frost system?
Technically, the No Frost system does not need to be defrosted, it does it itself. However, once a year (usually in spring or fall), it is recommended to unplug the unit, wash it and let it dry to remove bacteria and odors. You also need to clean the drainage hole.
Is it possible to transport the refrigerator lying down?
It is strictly not recommended to transport equipment lying down, especially on your back. Oil from the compressor may leak into the freon circulation circuit, which will lead to water hammer and breakdown. If transportation lying down cannot be avoided, after installation you need to let the device stand upright for at least 4-6 hours before turning it on.
What does the star marking on the freezer mean?
One star (*) means a temperature of -6°C (storage up to a week), two (**) - -12°C (up to a month), three () - -18°C (up to 3 months), four (*) - -18°C and below (up to a year), as well as a quick freezing function.