The question of what exactly is poured into the refrigerator often confuses inexperienced users, since it has two diametrically opposed meanings. On the one hand, we are talking about technical fluid - refrigerantwhich ensures the operation of the entire cooling system. On the other hand, this often means liquid food products that users, through carelessness or ignorance, try to place on shelves, creating emergency situations.
The technical side of the issue requires understanding that a gas or gas-liquid mixture under pressure circulates in a closed circuit. This is not something you can “add” yourself, like water into a kettle. At the same time, the domestic use of a refrigerator is inextricably linked with the storage of liquids: from milk and juices to hot soups, which requires strict adherence to temperature conditions.
In this article we will examine in detail both sides of the coin: which technical fluids are used by engineers in production and repair, and which products can be safely stored inside the chambers. Understanding these processes will help extend the life of your equipment and maintain food freshness.
Technical fluids: what is used to fill the refrigeration circuit
The main working fluid in any refrigeration machine is the refrigerant. In everyday life, it is often mistakenly called “freon,” although this is only a trademark of one of the classes of substances. Modern refrigerators most often they are filled with hydrocarbon gases (propane-butane mixtures) or synthetic fluorine-containing compounds. These substances have the unique ability to change their temperature during compression and expansion.
In addition to the refrigerant itself, it is necessarily present in the compressor system refrigeration oil. It is necessary to lubricate the rubbing parts of the motor-compressor. The oil must have specific properties: not freeze at low temperatures and not completely dissolve in the refrigerant, so that it always returns to the compressor crankcase. Mixing different types of oils is strictly prohibited, as this can lead to the formation of an acidic environment and corrosion.
⚠️ Attention: An attempt to independently add refrigerant to the system without evacuation and replacing the filter-drier will lead to the formation of an ice plug in the capillary and failure of the compressor.
It is important to understand that the system is sealed. If the refrigerator has stopped freezing, this does not mean that the liquid has “run out” or “evaporated”. This means that depressurization has occurred - a leak. Unlike a car, where you can add antifreeze, in a refrigerator you need to look for a hole, seal it and refill the system.
Why can’t you mix refrigerants?
Different types of refrigerants (for example, R134a and R600a) have different operating pressures and chemical compatibility with oil. Mixing can cause an explosive reaction or destruction of the rubber seals inside the system.
Liquid products: storage rules and temperature zones
When it comes to household use, the question “what is poured” transforms into “what can be stored in liquid form.” The refrigerator compartment has an uneven temperature distribution. It is usually warmer on the top shelf (about +5...+7°C), and colder above the vegetable drawers. The door is the warmest place where the temperature can fluctuate from +8 to +10°C due to frequent opening.
For liquid products this is critical. Dairy products that require a strict regime are better placed deep in the main chamber, and not on the door. Open juices and fruit drinks can be stored on the door, but their lifespan is reduced. Freezing liquids in glass containers is prohibited, since water expands when freezing, which is guaranteed to lead to glass rupture.
- 🥛 Dairy products: require a stable temperature of +2...+4°C, it is better to store on the middle shelf.
- 🧃 Juices and drinks: allow storage at +5...+8°C, shelves on the door are suitable.
- 🍲 Broths and soups: can be stored for up to 3 days, but only after complete cooling.
- 🍺 Carbonated drinks: not recommended freeze to avoid the container exploding.
Particular attention should be paid to the tightness of the container. Liquids quickly absorb extraneous odors and can also become a source of aroma for other products. The use of containers with a tight-fitting lid or special lids for glasses is a mandatory rule storage hygiene.
Dangers: why you can’t pour hot and unnecessary stuff
One of the most common mistakes is placing hot or warm liquids inside the chamber. Many users find that the refrigerator will quickly cool a pot of soup. In fact, this creates a colossal load on the compressor, which is forced to work at the limit, trying to compensate for the sharp temperature rise.
In addition, hot steam, condensing on the walls and other products, increases humidity. This leads to accelerated formation snow coat in older models or freezing of ice on the evaporator in No Frost systems. As a result, food nearby may begin to deteriorate, since the local temperature in the chamber will temporarily rise above the safe one.
⚠️ Attention: Never place containers in the refrigerator whose temperature is higher than +60°C. Let the dish cool to room temperature on the table.
Another danger is overfilling. If you fill a bottle or container to capacity and place it in the freezer, the liquid will increase in volume by about 9-10% as it freezes. This will cause the lid to come off and the container itself may rupture. Always leave free space at the neck.
Comparison of liquids: do's and don'ts
Not all liquids behave the same at low temperatures. Some may change their structure, delaminate or lose their taste. Below is a table to help you navigate which liquids are suitable for storage in the refrigerator, and which are best kept in the cupboard.
| Type of liquid | Storage location | Shelf life | Risks |
|---|---|---|---|
| Milk (open) | Main chamber, middle | 2-3 days | Rapid souring with changes |
| Mineral water | Door or bottom | Up to 1 month | Loss of gases during heating |
| Vegetable oil | Cabinet (optional) | Up to 18 months | Thickening and cloudiness in the cold |
| Eggs (liquid white) | Main chamber | 2-4 days | Loss of properties, risk of salmonella |
| Wine (opened) | Door (red/white) | 3-5 days | Oxidation, transformation into vinegar |
Pay attention to vegetable oils. Although many are accustomed to storing them in the refrigerator, at temperatures below +5°C they may form flakes or sediment. This does not mean that the oil has spoiled, but its consistency will change. For olive oil, cold may even be useful for preserving its properties, but it is better to keep sunflower oil in a dark, cool place outside the refrigerator.
Cleaning and defrosting systems: where does the water go?
During operation, water appears inside the refrigerator. In models with manual defrosting, it is formed from frost melting on the walls. In systems No Frost (without frost), moisture is released from food and air. Where does it go?
Modern models have a condensate drainage system. Water flows down the back wall into a special hole located at the bottom of the chamber. From there, through a drainage tube, it enters a plastic container (bath), which is fixed above the compressor.
The compressor gets very hot during operation. The water from the bath evaporates into the atmosphere naturally. That is why in a working refrigerator there should never be puddles underneath. If you notice water on the floor, this is a signal that the drainage hole is clogged or the bath has moved.
☑️ Checking the drainage system
Cleaning and disinfection: how to wash the internal chambers
To maintain hygiene in the refrigerator, it is necessary to periodically carry out wet cleaning. However, you cannot pour aggressive chemicals or large amounts of water into the chamber. Electronics and insulation can be damaged by moisture.
It is best to use a weak solution of baking soda or special sprays for refrigerators food-based. They are safe, do not have a strong odor and do not require careful rinsing. After treatment, the surfaces must be wiped dry with a soft cloth.
It is strictly forbidden to use abrasive powders that can scratch the plastic, or solvents that can destroy door seals. Also, do not pour water directly into the ventilation holes on the back wall of the chamber.
⚠️ Attention: Before starting any cleaning, be sure to unplug the refrigerator from the power supply. Contact of water with electrical contacts may cause a short circuit.
Frequently asked questions and misconceptions
Is it possible to add freon if the refrigerator has stopped freezing?
You cannot simply “add” freon. If the gas is gone, then there is a hole in the system. The technician must find the leak, seal it, replace the filter-drier, evacuate the system and only then fill it with new gas in a strictly defined amount.
Why can’t you put hot soup in the refrigerator?
This disrupts the temperature regime inside the chamber, forcing the compressor to work with overload. In addition, warm steam settles on other products, accelerating their deterioration, and contributes to the formation of an ice crust on the evaporator.
What will happen if a bottle of water bursts in the freezer?
Water expands when it freezes. If the bottle bursts, the water will leak out and freeze as ice at the bottom of the freezer or on the food. This may make it difficult for the No Frost system to work and will require defrosting.
How often should you defrost the refrigerator?
No Frost systems do not require defrosting (only occasional washing). Drip systems (“weeping wall”) also work automatically. Only old models where frost grows in a layer of more than 5 mm need to be defrosted, usually 1-2 times a year.