Many owners of household appliances, faced with a breakdown or studying the instructions, wonder Question: what is a refrigerator in a refrigerator? The term sounds complex and technical, evoking images of huge shipping containers or industrial installations. However, in the context of household appliances, this word most often hides either the refrigeration unit itself or its key component - the compressor.
In everyday life, the word “refrigerator” is rarely used, preferring simpler names. However, understanding the principle of operation of this device is necessary for anyone who wants to extend the life of their equipment. Refrigeration unit It is a closed system within which refrigerant circulates, taking heat from the chamber and throwing it out.
If you hear strange sounds or notice that the food has stopped cooling, the problem may lies precisely in the operation of this node. Understanding how a refrigerator workswill help you quickly diagnose the malfunction and explain to the technician the essence of the problem. Let's look at the structure of this "heart" of your kitchen in more detail.
Definition and basic concepts
First of all, you need to understand the terminology. A refrigerator is a technical device designed for artificial refrigeration. In a household refrigerator, this term is often used to refer to the whole refrigeration circuit assembly. However, in a narrower, professional sense, a refrigerator can mean a compressor-condensing unit.
It is this unit that is responsible for creating low temperatures. It does not “produce cold”, but transfers thermal energy from the internal volume of the chamber to the environment. This process occurs due to phase transitions of the working substance - freon or other refrigerant.
⚠️ Attention: Never try to open a sealed circuit or disconnect the tubes yourself. There is gas under pressure inside the system, and older models may contain toxic or explosive refrigerant.
Modern models are equipped with sophisticated electronics that control the operation of the refrigerator. Temperature sensors, inverter boards and thermostats are all part of a single system. If one of the elements fails, refrigerant circulation is disrupted and cooling stops.
Principle of operation of a refrigeration unit
The physical process underlying the operation of any household refrigerator is called throttling. The high-pressure liquid refrigerant enters the evaporator, where it expands sharply. At the same time, it boils at a very low temperature, actively absorbing heat from the air inside the chambers.
After the evaporator, gaseous freon enters the compressor. Here the gas is compressed, which leads to an increase in its temperature and pressure. Next, the hot gas moves to the condenser (a grill on the back wall), where it releases heat into the room and turns back into liquid. This cooling cycle is repeated continuously until the thermostat gives the command to stop.
It is important to understand that the efficiency of operation depends on the tightness of the system. Even a microscopic leak of freon leads to the fact that the refrigerator ceases to perform its function. The compressor will run non-stop, trying to get the temperature up, but it won't produce the desired result.
Modern inverter models work differently than older linear ones. They do not turn off completely, but only slow down the engine speed. This allows you to maintain stable temperature without sudden jumps, which is especially important for storing fresh food and freezing.
Key components of the system
To better understand what a refrigerator consists of, let's consider its main components. Each element performs a critical function, and the failure of any of them paralyzes the operation of the entire system.
- 🔹 Compressor - an electric motor that creates pressure and forces the refrigerant to move through the tubes. This is the noisiest and most energy-intensive element.
- 🔹 Condenser - an external radiator (often black on the back or sides of the housing), where the gas cools and turns into liquid.
- 🔹 Evaporator - a heat exchanger hidden inside the housing, where freon boils and direct air cooling.
- 🔹 Capillary tube —a thin copper pipeline that creates a pressure difference between the (high) and bottom (low) circuits of the system.
The filter drier deserves special attention. This small cylinder, placed in front of the capillary tube, traps moisture and microscopic debris. If the filter becomes clogged, refrigerant circulation stops, and an ice plug may form in the system.
In two-compressor models, each circuit operates independently. One refrigerator serves the refrigerator compartment, the other serves the freezer compartment. This increases reliability: if one breaks, the second will continue to work. However, such systems are more difficult to repair and maintain.
Types of compressors in modern models
Technical progress has also touched the “hearts” of refrigerators. If previously piston units were the standard, today the market is filled with more advanced models. Understanding the difference between them will help when choosing new equipment.
Linear compressors operate on the “on-off” principle. When the temperature rises above the set point, the motor starts at full power. When the minimum is reached, it turns off. This is a time-tested, but less efficient scheme.
Inverter motors, such as Digital Inverter from Samsung or Linear Inverter from LG, work constantly, but change the rotation speed. This allows you to avoid peak loads during startup, reduce noise levels and energy consumption by up to 30%.
| Compressor type | Noise level | Energy consumption | Service life |
|---|---|---|---|
| Piston (linear) | High | Standard | 7-10 years |
| Inverter | Low | Economic (Class A+) | 10-15 years |
| Linear inverter | Minimal | Super-economical | 15-20 years |
It is worth noting that inverter models are more sensitive to voltage drops in the network. To protect them, it is strongly recommended to use high quality voltage stabilizers or surge protectors. This will protect electronic board the engine from combustion.
Typical faults and diagnostics
How can you tell if the refrigerator is acting up? There are a number of signs that indicate problems with the cooling system. Ignoring these symptoms can lead to expensive repairs or complete replacement of equipment.
The most obvious sign is that the refrigerator is humming, but not cooling. This may indicate a freon leak or compressor failure. It is also worth paying attention to how often the motor turns on. If it works without interruptions, and the temperature in the chambers does not drop below +10 degrees, there is a problem.
- 🔸 The appearance of ice in the refrigerator compartment (with the No Frost system this is unacceptable).
- 🔸 Swelling of the rear or side wall of the case.
- 🔸 Characteristic smell of burning or oil in the compressor area.
- 🔸 Clicking sounds when trying to start the engine (start relay is faulty).
⚠️ Attention: If you smell ammonia, immediately ventilate the room and unplug the device. This is a sign of system depressurization in older models that used ammonia as a refrigerant.
It is better to start diagnosis with an external examination. Check if the condenser at the back is hot. If the grille is cold, although the motor is running, it means that freon is not circulating. If the grate is hot but there is no cold, the capillary tube may be clogged or the valve is faulty.
Why can’t you quickly defrost the refrigerator with a knife?
Mechanical damage to the evaporator will lead to an instant leak of freon. Repair in this case will require replacing the evaporator (often foamed into the housing) and refilling, which is not economically feasible.
Care and extending service life
A refrigerator is a complex mechanism that requires proper handling. You can extend its life by following simple operating rules. First of all, this concerns the cleanliness of the heat exchanger.
Dust settling on the black grille at the back of the refrigerator works as a heat insulator. It becomes more difficult for the compressor to release heat, it overheats and wears out. Regular cleaning behind the refrigerator is a mandatory procedure.
Condenser cleaning algorithm:1. Disconnect the refrigerator from the network.
2. Move the equipment away from the wall.
3. Vacuum the grille with a soft nozzle.
4. Wipe with a damp (not wet!) cloth.
5. Allow to dry before turning on.
It is also important not to overload the freezer. Excess ice interferes with normal air circulation. If you have a drip-type system, remember to defrost it at least once a year. For systems No Frost it is enough to wash the internal surfaces as they become dirty.
Do not place hot pots inside the chambers. A sharp jump in temperature forces the refrigerator to work in extreme mode, which reduces the life of the compressor. Allow the food to cool to room temperature before putting it on the shelf.
☑️ Monthly check-up of the refrigerator
When you need to call a technician
Independent repair of a refrigeration unit is impossible without special equipment: a vacuum pump, a pressure gauge station and scales for charging freon. Therefore, any intervention in a sealed circuit should be performed by professionals.
If you have diagnosed a leak, a burned out compressor or a clogged system, a call to a specialist is inevitable. The technician will perform a nitrogen test to find the location of the leak, replace the filter drier and charge the system with the exact amount of refrigerant.
Remember that trying to “reanimate” an old refrigerator by adding freon without eliminating the cause of the leak is a temporary measure. In a short time the problem will return and you will lose money. In some cases, it is easier and cheaper to buy new equipment than to repair the old one by replacing the compressor.
What to do if the refrigerator makes a loud knock when starting up?
A loud knock or clanging sound when turned on often indicates a faulty start relay or water hammer in the compressor. If the knock is one-time and after that the unit operates normally, the relay may simply be clicking. If the knocking noise is repeated and the refrigerator does not turn on, the motor is “jammed.” The starting device or the compressor itself needs to be replaced.
Is it possible to transport the refrigerator lying down?
Transporting the refrigerator in a horizontal position is extremely undesirable. Oil from the compressor may leak into the freon circuit, resulting in an oil blockage. If transportation lying down cannot be avoided, after installation, let the equipment stand upright without turning it on for at least 12-24 hours so that the oil flows back into the crankcase.
Why is the back wall of the refrigerator hot?
This is normal. A condenser is located in this place, which releases the heat extracted from the products. However, if the wall becomes hot to the point where it is painful to touch, or, conversely, remains cold when the engine is running, this is a sign of a malfunction of the heat exchange system or a leak.
How often do you need to change the freon in the refrigerator?
Freon is not a consumable material and does not require scheduled replacement. In a serviceable, sealed circuit, it circulates for decades without loss of properties. Replacement is required only if a leak is detected, after which the system is recharged.