A modern refrigerator is no longer just a freezer with a milk shelf, turning into a sophisticated climate control system for your products. Among the many functions and departments, a special place is occupied by the so-called zero zone, which often causes confusion among new equipment owners. Many users simply do not understand how this zone differs from a regular shelf, and continue to put everything there, depriving themselves of the opportunity to prolong the freshness of delicacies.
The essence of the technology lies in creating an ideal microclimate, where temperature and humidity levels are strictly controlled electronically. Unlike standard departments, here the conditions are as close as possible to those in which biological processes in products slow down, but do not stop completely, as during freezing. This allows you to preserve the structure of tissues, taste and vitamin composition for much longer.
In this article we will analyze in detail the physical principle of operation of the zero chamber, teach you how to properly distribute products and answer the question of whether it is worth overpaying for this option when purchasing a new unit. Understanding the principles of operation Fresh Zone will help you save on groceries and always have a fresh dinner at hand.
Principle of operation and physics
The main secret of the zero zone is to maintain a temperature that ranges from 0 to +3 degrees Celsius. This is the “golden mean” where pathogenic bacteria practically stop multiplying, and enzymatic reactions inside vegetables and fruits are inhibited. An ordinary shelf in the refrigerator compartment often has a temperature of about +5...+7 degrees, which is no longer sufficient for long-term storage of perishable goods.
The most important parameter, in addition to the degree, is humidity. Depending on the type of product, different conditions may be created in the zero chamber. For meat and fish, dry cold is necessary so that the surface does not weather and become slippery. Greens and vegetables, on the contrary, require high humidity, close to 90-95%, to prevent wilting and loss of cell turgor.
⚠️ Attention: Do not try to store food in the zero zone that you have just removed from a boiling pot or pan. A sharp jump in temperature will disrupt the sensor settings, and the system will not be able to quickly restore the desired mode, which is dangerous for neighboring products.
The air circulation system in such areas is often isolated from the main volume of the refrigerator. This is realized through separate flaps or completely sealed boxes with controlled ventilation. Thanks to this, when you open the main door, you do not disturb the climate in the freshness zone, which makes its operation more energy efficient and stable.
Types of zero chambers: dry and moist freshness
Manufacturers of refrigeration equipment, such as Liebherr, Bosch i LG, have developed various modifications of zero zones, each of which is tailored for a specific type of product. Understanding the difference between them is critical to proper operation. Most often, there are two main types of chambers that can be present in one model at the same time.
The first type is a chamber for storing meat, fish and seafood. Low humidity (about 50%) and temperature close to zero are maintained here, but without transition to the ice phase. Such conditions prevent the oxidation of fats and the development of mucus on the surface of protein products. This compartment is often called the “dry zone” or Meat Box.
The second type is intended for plant foods. Here the humidity is increased to 90% or higher, which prevents vegetables from shrinking and losing juice. Leafy greens, berries, mushrooms and fruits thrive here. Some advanced models allow you to switch operating modes of the same drawer by changing the position of the damper or the settings of the electronic control unit.
- 🥩 The dry zone is ideal for raw meat, poultry, fish, sausages and cheeses.
- 🥬 The wet zone is necessary for storing herbs, salads, vegetables, fruits and berries.
- 🍺 Universal compartments are suitable for storing drinks, sauces and ready-made dishes in closed containers.
What can and cannot be stored in the zero zone
Correct distribution of products is the key to long-term operation of equipment and preservation of food quality. The zero zone is not designed for all the contents of your refrigerator. There are categories of products that, under such conditions, deteriorate faster or lose their consumer properties.
First of all, products with a short shelf life should be placed here. Chilled meat, which you plan to cook in 2-3 days, in a regular chamber may begin to deteriorate by the evening of the next day, while in a zero chamber it will quietly lie for up to 5-7 days. The same goes for fresh fish and open packages of delicacies.
⚠️ Attention: It is strictly not recommended to store tropical fruits (bananas, mangoes, pineapples) in the zero zone. At temperatures around zero, they “freeze” from the inside, lose their taste and turn black, even if they look normal on the outside.
You should not put baked goods in this compartment, as the low temperature will accelerate the process of starch staling (retrogradation), and the bread will become tough much faster than at room temperature. Also, products in open metal containers without a lid are not placed here, as they can oxidize.
☑️ Checking the readiness of the product for the zero zone
Comparison of shelf life of products
To understand the economic and practical benefits of using the zero zone, just look at the numbers. The difference in shelf life of products between the regular refrigerator compartment and the freshness zone can be twofold or even threefold. This allows you to purchase products less often and in larger volumes, without fear of throwing them away.
The table below shows average data that is relevant for most modern models of refrigerators with the function Zero Degree. It is worth considering that the actual timing depends on the initial freshness of the product and compliance with storage conditions.
| Product type | Regular compartment (+5°C) | Zero zone (0...+3°C) | Improvement coefficient |
|---|---|---|---|
| Fresh beef | 2 days | 6-7 days | 3x |
| Fresh fish (fillet) | 1 day | 3-4 days | 3-4x |
| Lettuce | 2-3 days | 7-10 days | 3x |
| Hard cheese (piece) | 5-7 days | 14-20 days | 2-3x |
| Ready meals | 2 days | 4-5 days | 2x |
As can be seen from the data, the largest increase in terms is observed for protein products and greens. It is for them that the purchase of a refrigerator with a zero zone pays off most quickly, since the cost of meat and fish is much higher than the cost of vegetables.
Technological differences between brands
Each manufacturer tries to stand out by giving their technologies sonorous names. However, similar engineering solutions are often hidden behind the marketing shell. Understanding the terms is useful when choosing new equipment so as not to overpay for “air.”
The company Liebherr, which is considered a pioneer in this area, uses the terms BioFresh. Their system is distinguished by the presence of a separate cooling circuit and precise humidity control. In more expensive models, drawers BioFresh can be pulled out on telescopic guides and have a glass bottom for better viewing.
Brand Samsung uses the name Flex Zone or Cool Select+. The peculiarity of their approach is the ability to flexibly adjust the temperature by the user. You decide for yourself whether this compartment will work as a freezer, zero zone or just a refrigerator. This is convenient, but requires more careful control of the settings.
In models Bosch and Siemens the technology is called VitaFresh. The engineers of these brands rely on a three-stage air damper system, which ensures very smooth and uniform cooling without drafts, which is especially important for delicate berries and greens.
Why does not ice form in the zero zone?
Ice does not form because the temperature is maintained strictly above the freezing point of water (0°C), usually in the range +0.5...+2°C. Even if the humidity is high, the water does not crystallize, remaining in a liquid state inside the cells of the product.
Care and maintenance of the freshness zone
The zero zone requires special attention when cleaning. Due to specific humidity conditions, specific odors or mold may appear here more quickly if spilled liquids are not cleaned up in a timely manner. Regular hygiene is necessary to maintain the effectiveness of the sensors.
Drawers should be cleaned with a soft sponge and neutral detergents. Abrasive powders can scratch the plastic, and bacteria will begin to multiply in the microcracks, which will then spread to the food. Pay special attention to drainage holes, if they are provided for in the design.
Once every six months, it is recommended to defrost the entire refrigerator, including the zero zone. Although modern systems No Frost get rid of ice, dust and micro-food particles still accumulate on the evaporator and fans, which can reduce cooling efficiency.
⚠️ Attention: When washing zero zone drawers, avoid using hot water. A sharp temperature change can lead to deformation of the plastic or the appearance of cracks, which will break the seal of the compartment.
Monitor the condition of the rubber seals on the drawer doors. If they dry out or become dirty, the seal is broken and the moisture goes into the general compartment of the refrigerator. The check can be carried out with a simple test with a sheet of paper: hold it with the door and try to pull it out - it should come out with force.
Frequently asked questions (FAQ)
Is it possible to freeze food in the zero zone?
No, it is not possible. The temperature in the zero zone is maintained above the freezing point (usually not lower than 0°C). Products here are only deeply cooled, but do not turn into ice. To freeze, use a freezer where the temperature is -18°C or lower.
Why are products not covered with ice in the zero zone?
Products are not covered with ice because the temperature is strictly controlled and does not fall below 0 degrees. In addition, in dry areas, low humidity prevents the formation of condensation on the surface, which could freeze.
Is it harmful to store medications in the zero chamber?
It depends on the type of medication. Most medications require storage at a temperature of +2...+8°C, which ideally corresponds to the conditions of the zero zone. However, be sure to read the instructions on the packaging: some medications should not be stored near food due to the risk of absorbing odors or chemical interactions.
Does the refrigerator use more electricity with the zero zone turned on?
Yes, electricity consumption increases slightly, since the compressor has to work harder to maintain a lower temperature in the isolated volume. However, modern inverter compressors minimize this difference, making it almost imperceptible in electricity bills.
Is it possible to turn off the zero zone if it is not needed?
In most models with electronic control, the zero zone mode can be turned off or switched to normal cooling mode through the control panel. In mechanical models, the drawer will simply work like a regular shelf with a slightly lower temperature, and you cannot turn it off separately.