Choosing a new household appliance equipment, we often pay attention to the volume of chambers, the presence of a freshness zone or a defrosting system, forgetting about a parameter that directly affects the quality of life - the noise level. Compressor hum and the gurgling of the refrigerant becomes a constant background, especially in studio apartments or kitchens combined with living rooms. Understanding what exactly is hidden behind the numbers in decibels will help you avoid sleepless nights and irritation from intrusive sound.
Technical specifications always contain information about the sound pressure created by the unit during operation. Modern inverter models are able to work almost silently, while old ones Linear compressors can create noticeable vibration and hum. It is important not only to know the standard values, but also to be able to distinguish the normal sounds of the system from signs of a malfunction that requires the intervention of a technician.
In this article we will analyze the physical basis of noise, consider acceptable standards and give practical advice on installing equipment to minimize acoustic discomfort. Sound power is not easy a marketing ploy, but an important engineering parameter that depends on the design of the motor, the quality of the refrigerant and even the housing materials.
The physical nature of noise in refrigeration equipment
The source of sound in a refrigerator is a complex set of mechanical and thermodynamic processes. The main noise generator is traditionally considered to be compressor the heart of the refrigerator, which compresses the gaseous refrigerant, forcing it to circulate throughout the system. When the piston engine starts, a sharp jump in pressure occurs, which causes a characteristic click and subsequent vibration of the housing.
However, do not forget about other sound sources. The circulation of freon through the tubes of the evaporator and condenser is accompanied by gurgling and hissing sounds, which often frighten inexperienced users. No Frost System adds to this background noise the operation of fans driving cold air through the chambers. In modern models, engineers introduce special dampers and use sound-insulating materials to reduce vibration levels.
⚠️ Attention: If you hear a sharp metallic clang, whistle or loud knock that does not stop after starting the engine, this may indicate mechanical damage to internal parts. In such a situation, the operation of equipment is dangerous.
Sound intensity is measured in decibels (dB) and depends on many factors, including the speed of the engine shaft. Linear compressors they work jerkily, turning on at full power and turning off, which creates peak loads on hearing. In contrast, inverter systems maintain a constant temperature, operating in an economical mode with minimal sound pressure.
Noise level standards and classification of models
According to current standards, household refrigerators are divided into several classes according to the level of sound emitted. For most models, a reading in the range from 34 to 42 dB is considered normal. Values above 44 dB can already cause discomfort in a quiet room, especially at night, when the background noise of the apartment is minimal.
It is important to understand that the characteristics declared by the manufacturer are often measured in special anechoic chambers at a certain distance. In real conditions room acoustics can amplify or absorb sounds. For example, in an empty kitchen with a tiled floor and walls, the hum will be heard more clearly than in a room filled with furniture and upholstery.
Let's consider a comparative table of noise levels for different types compressors:
| Compressor type | Average noise level (dB) | Nature of operation | Recommendation |
|---|---|---|---|
| Linear (old style) | 42-48 dB | Cyclic, with jerks | For large kitchens |
| Linear (modern) | 38-42 dB | Smoother start | Standard apartments |
| Inverter | 30-36 dB | Permanent, monotonous | Studio and open layouts |
| Absorptive | 25-30 dB | Almost silent | Bedrooms and offices |
When choosing appliances for the kitchen-living room, you should give preference to models with marking Silent or Quiet Drive. Such devices are often equipped with additional insulating covers for the engine compartment. It is also worth considering that two-compressor models may be quieter in operation, since each motor turns on less often and operates with less load.
Why did the old refrigerator begin to make more noise
If a previously quiet unit suddenly began to hum, knock or vibrate, this is a signal of changes in its operation. The first and most common reason is a violation of the horizontal position of the body. Over time, the legs can become loose, and the spring mechanisms of the compressor suspension can weaken, which will lead to the transmission of vibration to the floor and walls.
The second reason lies in the wear of the mechanical parts. Motor bearings or the bushings can dry out or collapse, causing a metallic grinding sound. It is also worth checking the capacitor on the rear wall: if it is contaminated with dust or touches the wall, a resonance occurs, which multiplies the noise many times over.
☑️ Diagnosis of the noise source
Another factor is the quality of the refrigerant and the presence of air pockets in the system. If there is not enough freon or a mixture of gases circulates in the circuit, the compressor is forced to work with overload, trying to gain the required pressure. This not only increases the noise level, but also shortens the service life of the motor-compressor motor-compressor.
The influence of installation on acoustic comfort
Correct installation of the refrigerator is 50% of success in the fight against excess noise. Even the quietest model will hum if installed crookedly or close to furniture. The gap between the back of the device and the wall should be at least 5-10 cm for free air circulation and absence of resonance.
Use a building level to check the horizontal position. Adjust the height of the front legs so that the doors close by themselves under the influence of gravity, but at the same time the body stands stable. Anti-vibration pads under the legs can significantly reduce the transmission of low-frequency hum to the floor covering.
⚠️ Warning: Do not install the refrigerator close to the cabinets or wall without a gap. This will not only increase the noise, but will also lead to overheating of the compressor due to insufficient cooling of the condenser.
If the refrigerator is built into a kitchen unit, make sure that the niches and panels are not in tight contact with the body. The vibration of a running motor is transmitted to the furniture, turning the entire kitchen module into a resonator. In such cases, it is recommended to glue the contact points vibration-isolating tape or use rubber gaskets.
How to reduce the noise level with your own hands
There are a number of simple steps that will help make the operation of the refrigerator quieter without calling a technician. First of all, inspect the space around the unit: foreign objects standing on the lid or leaning against the sides may rattle due to vibration. Remove bottles, cans and decorative elements.
Check the internal filling of the chambers. If dishes or glass jars touch each other or the walls, they will rattle when the fan or compressor is running. Use plastic containers and organizers to secure items. It is also worth checking the shelves: they should fit tightly in the grooves.
If the noise comes from the No Frost system, the fan blades may be touching ice or a foreign object. In this case, you will need to completely defrost the refrigerator within 10-12 hours. Often, after the ice in hidden cavities thaws, extraneous sounds disappear.
Quiet models: what to look for when buying
When choosing a new refrigerator for an open-plan apartment, pay attention not only to the design, but also to the technical specifications. Look for models with inverter motorwhich guarantees smooth operation and the absence of loud starting currents. Brands often label such series with the words “Silence”, “Quiet” or “Inverter”.
The volume of the fridge compartment also matters: larger models require more powerful compressors, which can make more noise. However, modern technologies make it possible to create spacious and quiet units. Read user reviews specifically about noise, since in the specifications the data may be averaged.
The secret of the quiet operation of absorption refrigerators
Absorption refrigerators operate without moving mechanical parts (compressor), using a heating element and a chemical reaction of ammonia. They are absolutely silent, but they consume more energy and take a long time to gain temperature.
Do not forget that double-circuit cooling system (separate compressors for the refrigeration and freezer compartments) allows you to turn on the motors in turn, which reduces the overall background noise in the room. This is especially true at night, when the freezer may not turn on at all.
Frequently asked questions (FAQ)
Is it normal for the refrigerator to gurgle and click?
Yes, this is absolutely normal. The gurgling sound is the sound of refrigerant moving through the tubes, and the clicking sounds are made by the thermal relay when the compressor turns on and off. If these sounds are not accompanied by malfunctions, there is nothing to worry about.
Why is a new refrigerator noisier than the old one?
Modern models often work more efficiently, but may have a different sound tone. In addition, new refrigerators may use a more environmentally friendly, but slightly noisier refrigerant, or the compressor operates at higher speeds for faster freezing.
Is it possible to lubricate the compressor so that it makes less noise?
Absolutely not. The compressor is a sealed unit that cannot be serviced at home. Any intervention will lead to depressurization of the system and failure of the equipment. You can only lubricate door hinges if the creaking comes from them.
Does the temperature in the room affect the noise level?
Yes, in a hot room the compressor is forced to work longer and more intensely in order to maintain the set temperature inside the chambers. This leads to an increase in the operating time of the motor and, accordingly, the total time during which the noise is heard.
What to do if the refrigerator starts humming only at night?
At night, the general background noise in the apartment decreases, and the operation of the equipment becomes more noticeable. Also, at night, the voltage in the network may drop, which makes it difficult to start the engine. If the humming becomes unnaturally loud, check the stability of the legs and the absence of contact with the furniture.