Many owners of modern household appliances are faced with a situation where, after slamming the refrigerator door, a characteristic gurgling or pouring of liquid is heard inside. This sound can be alarming, especially if the equipment was previously quieter, but in the vast majority of cases it indicates normal operation of the system and not a breakdown. Understanding the physical processes occurring inside a closed circuit will help distinguish normal operation from a real malfunction that requires the intervention of a technician.
The sound of circulating refrigerant is a natural consequence of the operation of the compressor and the movement of freon through the evaporator tubes. Noise intensity directly depends on the type of gas used, the design of the system, and even how level the equipment is installed on the floor. In this article, we will analyze in detail the mechanisms of sound occurrence, consider the differences between models from different manufacturers and determine situations when gurgling becomes an alarm signal.
Physics of the process: movement of refrigerant in the system
The main reason for the appearance of sounds of water or gurgling lies in the principle of operation refrigeration cycle. Freon constantly circulates inside the sealed circuit, which alternately changes its state of aggregation from liquid to gaseous and back. As the compressor pressurizes, the refrigerant is forced through narrow capillary tubes and the expansion valve into the evaporator. It is at this moment that a sharp boiling of the liquid occurs and its active movement, which we hear as gurgling. refrigerant (freon), which alternately changes its state of aggregation from liquid to gaseous and back. As the compressor pressurizes, the refrigerant is forced through narrow capillary tubes and the expansion valve into the evaporator. It is at this moment that the liquid boils sharply and actively moves, which we hear as gurgling.
This effect is especially pronounced immediately after closing the door. At this moment, warm air enters the chamber, sensors detect an increase in temperature, and the compressor starts or goes into high power mode. Gas circulation becomes more active to quickly cool the internal volume. The sound may increase if a small amount of oil remains in the system, which moves along with freon, creating characteristic overflows.
It is important to understand that modern models often use refrigerants, which can be noisier when moving compared to gases of older generations. For example, isobutane (R600a)which is widely used today because of its environmental friendliness, has different acoustic properties from fluorocarbons (R134a) . Gurgling in such systems is a normal operating sound, confirming that heat exchange is occurring correctly.
The influence of the type of refrigerant on the noise level
The type of gas used plays a decisive role in acoustic comfort. Manufacturers are increasingly switching to environmentally friendly substances, which, however, have their own operating characteristics. Isobutane (R600a) requires less amount of substance for effective cooling, but its movement through the tubes may be accompanied by louder and more distinct sounds of liquid flow. This is due to the physical properties of the gas and the pressure in the system. Isobutane (R600a) In contrast, older models or industrial equipment often ran on R12 or even R12. These gases created a slightly different acoustic profile, often more dull. If you replaced an old refrigerator with a new one and heard gurgling noise, most likely it was a change in the type of refrigerant and the design of the evaporator. In modern systems, the tubes can be located closer to the walls of the chamber, which enhances the sound.
In contrast, older models or industrial equipment often ran at R134a or even R12. These gases created a slightly different acoustic profile, often more dull. If you replaced an old refrigerator with a new one and heard gurgling noise, most likely it was a change in the type of refrigerant and the design of the evaporator. In modern systems, the tubes can be located closer to the walls of the chamber, which enhances the sound.
Is it possible to replace the gas with a quieter one?
Theoretically this is possible, but in practice such a replacement is economically impractical and technically difficult. A complete overhaul of the system, replacement of the compressor and filter drier are required. In addition, different gases require different oils, and mixing them is unacceptable.
Below is a table showing the main differences between popular types of refrigerants and their impact on the operation of equipment:
| Refrigerant type | Chemical basis | Features sound | Environmentally friendly |
|---|---|---|---|
| R600a (Isobutane) | Hydrocarbon | Clear gurgling, overflow | High |
| R134a | Fluorocarbon | Double noise, hissing | Medium |
| R12 | Freon (obsolete) | Monotonous hum | Low |
| R407C | Mixture of fluorocarbons | Unstable noise | Average |
Design features and arrangement of tubes
Another factor affecting the audibility of the refrigerator is the design of the evaporator and the method of its installation. In models with the system No Frost the evaporator is hidden behind a plastic panel, which further isolates sounds. However, in refrigerators with a drip system or combined cooling, the tubes can be mounted directly into the walls of the case or attached to the rear grille. In such cases, the vibration and sound of the flowing liquid are transmitted to the metal walls, working as a resonator.
Particular attention should be paid to models with freshness zone or additional cooling circuits. In them, the tube system is more branched, which increases the likelihood of flow sounds occurring in different parts of the chamber. If gurgling is heard primarily in the upper or lower part of the refrigerator, this may indicate a specific location of the bends of the tubes where condensation or oil accumulates.
It is also worth noting the role compressor. Inverter models that operate constantly, but with different power, can create background noise of freon movement, which either subsides or intensifies. Unlike older start-stop motors, they do not hum sharply, but the sound of circulation in them can be longer and noticeable in silence.
When gurgling is a sign of trouble
Although fluid sounds are often normal, there are situations when they indicate to problems. If gurgling is accompanied lack of cold or insufficient cooling of the food, this is an alarming signal. In this case, the sound may indicate that an oil plug has formed in the system or that the capillary tube has partially clogged. Freon cannot circulate freely, and tries to push it through, creating characteristic sounds.
Another dangerous symptom is the appearance of gurgling along with hissing, which does not stop even after turning off the device from the network. This may indicate a gas leak. If you notice oily spots under the refrigerator or on the back wall, you must immediately stop using it and call a technician. depressurization of the circuit and gas leak. If you notice oily stains under the refrigerator or on the back wall, you must immediately stop using it and call a professional.
☑️ Diagnosis of the condition of the refrigerator
It is also worth paying attention to the frequency sounds. If the refrigerator gurgles every 5-10 minutes and does not reach the desired temperature, the thermostat or electronic control module may have failed, causing the system to operate in emergency mode. In such cases, independent repair is impossible and professional diagnostics are required.
The effect of improper installation on acoustics
Often the cause of excessive noise lies not in the insides of the unit, but in the way it is installed. If the refrigerator is not level, the liquid in the tubes and tray may splash more actively, creating additional sounds. Case skew also affects the operation of the compressor and fans (in No Frost systems), which together gives the effect of increased gurgling.
For proper installation, you must use a building level. The refrigerator legs should be adjusted so that the door closes on its own when opened to 45 degrees. This ensures the correct position of the internal mechanisms and the drainage of condensate. If the equipment is standing on a slippery floor (tiles, linoleum), even slight vibration from the operation of the motor can be transmitted to the floor and increase the resonance.
⚠️ Attention: Do not install the refrigerator close to a wall or furniture. For normal air circulation and reduced resonance, a gap of at least 5-7 cm is required from the back wall to the obstacle.
Comparison of noise standards for different brands
Different manufacturers use different noise insulation technologies and components, which affects the final sound level. European brands often focus on quiet operation by using composite materials for compressor housings. Asian manufacturers can use more powerful motors, which, despite their efficiency, create a more noticeable acoustic background when the refrigerant moves.
When choosing equipment, you should pay attention to the parameter noise levelindicated in the product passport. A value of up to 40 dB is considered normal. If the declared level is low and the gurgling is loud, this may indicate a faulty assembly or damage to the internal tube fasteners during transportation.
Methods for reducing noise levels
If sounds cause discomfort, but the equipment is working properly, you can try to reduce their intensity. First of all, check whether the refrigerator pipes are touching walls, furniture, or each other. Sometimes it is enough to move the unit a little or bend the protruding copper tube (carefully so as not to damage it!) to eliminate the rattling.
Checking the loading of the chambers is also an effective method. An empty refrigerator may “sound” louder due to the absence of objects that absorb sound waves. Filling the chambers with products (within reasonable limits) creates additional sound insulation. However, you should not fill the refrigerator to capacity, this disrupts air circulation.
Is it worth soundproofing the compressor yourself?
Experts do not recommend covering the compressor with soundproofing materials yourself. This can disrupt heat dissipation, lead to overheating of the motor and its premature failure.
FAQ: Frequently asked questions
Why does the refrigerator gurgle only at night?
At night, the overall noise level in the apartment decreases, and you just begin to notice the normal sounds of the appliances, which were drowned out during the day household noise. Also at night, the voltage in the network may decrease, which affects the operation of the compressor.
Is it normal for a new refrigerator to gurgle?
Yes, absolutely normal. In the new system, the oil has not yet been distributed evenly, and the internal elements have not ground in. Usually, after 1-2 weeks of operation, the sounds become quieter or remain at the same level, no longer irritating the ear.
Can gurgling be a sign of defrosting?
Yes, in No Frost systems, when the evaporator defrosts, water flows into the pan, which may be accompanied by the sounds of dripping or gurgling. This is a normal process that occurs cyclically.
What to do if the gurgling becomes very loud?
If the sound changes abruptly and becomes very loud, check the stability of the installation. If everything is in order with the installation and the temperature inside remains the same, most likely this is a feature of the operation of a particular instance. If the cold disappears, call a specialist.