In the modern world of household appliances, the question of what refrigerators without defrosting are called is of concern to almost every buyer. The term “No Frost” has become a household word, but this name hides many different technologies that manufacturers implement into their devices. Understanding these differences is critically important, since not only the comfort of use, but also the safety of food, as well as the durability of the unit itself depends on the type of cooling system.
Many consumers mistakenly believe that the absence of the need for manual defrosting is a single standard feature for all new models. In fact, the market offers several fundamentally different approaches to solving the problem of ice formation. Automatic defrosting systems can be implemented both in the freezer and in the refrigerator compartment, and the principles of their operation are significantly different.
In this article we will analyze in detail how such devices are correctly named, in which cover the technical nuances of operation capillary system and forced air circulation, and we will also help you make an informed choice when purchasing new equipment for the kitchen.
Terminology: how to correctly name the technology
When you hear the phrase "refrigerator without defrosting", we are most often talking about systems united by a common name No Frost (from English "without frost"). However, in technical documentation and on store price tags you can find other designations that often confuse the inexperienced buyer. It is important to understand that “No Frost” is, in fact, a marketing term that has become a de facto standard to designate any refrigerators with forced air circulation.
The technically correct name for the process is automatic defrosting of the evaporator. In such devices, a fan drives dry, cold air through the chambers, preventing moisture from settling on the walls and food in the form of a fur coat. At the same time, there are systems that require minimal maintenance, but are not fully automatic. For example, technology Low Frost or Smart Frost only reduces the amount of ice formed, but does not eliminate the need for rare manual defrosting once every year or two.
The difference in names is often dictated by the manufacturer brand. Samsung may use the term Twin Cooling System, while LG prefers Total No Frost. Despite the variety of names, the essence remains the same: an engineering solution aimed at eliminating the need for user intervention in the ice removal process.
⚠️ Attention: Do not confuse the “No Frost” marking only on the freezer with a full-fledged system for the entire refrigerator. In budget models, there is often a hybrid where the freezer does not require defrosting, and the refrigerator compartment must be thawed manually every six months.
Why do manufacturers use different names?
Different brands patent their technologies under unique names in order to stand out in the market. However, the physical principle of operation (air circulation or drip system) remains similar for most models.
The principle of operation of the No Frost system
To understand why these refrigerators do not need to be defrosted, you need to look inside their design. Unlike classic models, where the cold is transmitted through walls or open evaporators, the system No Frost uses a hidden evaporator. It is usually located behind the back wall of the freezer or at the top of the unit. Air is forced through this frozen element using a special fan, cooled and then distributed throughout the entire volume of the chambers through a system of channels.
The key element here is cyclic heating. Periodically, usually every 8-16 hours of compressor operation, a special heating element (TEN) is turned on. It briefly heats up the hidden evaporator, melting the condensate frozen on it. The resulting water flows into a special pan located above the compressor, where it safely evaporates under the influence of the heat of the running motor.
Thus, the user never sees the process of ice formation, since it occurs in a hidden technical compartment. Air circulation ensures uniform temperature in all corners of the refrigerator, which is a huge plus for storing food. However, this coin also has a downside: dry air can dry out unpackaged food faster, so storing food in containers or cling film becomes a must.
Drip system: automatic, but not complete
Often, when wondering what refrigerators without defrosting are called, people forget about the "drip" system, also known as Direct Cool or "crying evaporator". In such models, automatic defrosting concerns only the refrigerator compartment. The back wall of the refrigerator is a hidden evaporator, which is periodically covered with a thin layer of frost.
When the compressor turns off, the wall thaws and drops of water flow down the groove into the drainage hole. From there, the water goes into a container above the compressor. This process occurs unnoticed by the user. However, in the freezer compartment of such refrigerators, a static cooling mode is most often used, where manual defrosting it is still required, although infrequently - approximately once every 6-8 months.
The main advantage of such a system over a full-fledged one No Frost is the higher humidity inside refrigeration chamber. Products in “crying” refrigerators dry much slower, which allows you to store vegetables and fruits open longer. In addition, these models are quieter, since they have no fan noise, and their energy consumption is often lower.
Low Frost and Smart Frost technologies
There is an intermediate class of devices that manufacturers position as an improved version of static refrigerators. Technologies Low Frost (from Bosch, Siemens) and Smart Frost (from Indesit, Ariston) involve the use of a special evaporator that surrounds the chambers around the perimeter, or the use of smooth internal surfaces without protruding elements.
In such refrigerators, ice is formed, but its amount is minimal due to improved tightness and special design. The inner walls are made in such a way that the frost does not adhere tightly to them, but is easily separated in layers when defrosting. This is a compromise option for those who do not like the hum of fans No Frost, but also do not want to wash the refrigerator every week.
The main difference from a full-fledged automatic system is that there are no heating elements for defrosting and fans for accelerating air. Cooling occurs due to natural convection, but optimized by engineers. Defrosting In such models it is rarely required, but it is still necessary to maintain energy efficiency and hygiene.
| Parameter | No Frost (Full) | Drip (Direct Cool) | Low / Smart Frost |
|---|---|---|---|
| Refrigerator defrosting | Not required | Automatic | Rarely (once a year) |
| Freezer defrosting | Not required | Manually (once every 6 months) | Rarely (once a year) |
| Internal humidity | Low (dries out food) | High | Medium/High |
| Noisiness | There is fan noise | Quiet | Quiet |
| Energy consumption | Above average | Low | Low |
Comparison of advantages and disadvantages
When choosing between different types of refrigerators, it is important to weigh all the pros and cons. No Frost refrigerators give maximum comfort: forgot an open bag of soup? It's okay, it won't freeze to the shelf. The temperature regime in them is stable, and after opening the door, the cold is restored faster due to active circulation.
However, they also have disadvantages. In addition to the higher price and noise, it is worth noting the complexity of the design. The presence of fans, additional sensors and heating elements increases the number of components that can theoretically fail. Repair Such systems are often more expensive than restoring simple drip models.
Drip systems and their modifications Low Frost benefit in reliability and preservation of natural humidity. They store greens, vegetables and fruits better without packaging. But the need to periodically (albeit rarely) defrost is a critical inconvenience for some users. Also, in static refrigerators, the temperature at the back wall may be lower than at the door, which requires proper placement of products.
Features of care and operation
Even if you bought a refrigerator that is called “without defrosting,” this does not mean a complete lack of care. In systems No Frost it is critical to keep the drain hole clean. Although the water drains by gravity, crumbs and dirt can clog the channel, which will lead to water leaking onto the floor or inside the chamber.
To clean the drainage, you can use a soft rag or a special brush-brush, which is often included. It is also necessary to regularly wash the internal surfaces, since dry air does not kill bacteria, but only preserves them. The frequency of general cleaning depends on the intensity of use, but you will still have to wash the refrigerator once every 3-4 months.
In models with drip system caring for the drainage groove is even more important, since it is through it that the bulk of the water flows during defrosting. If the groove freezes or becomes clogged, water will leak onto the refrigerator shelves. You can clean it with a cotton swab or soft wire, but you need to act carefully so as not to damage the plastic.
☑️ Monthly maintenance of the refrigerator
Frequently asked questions (FAQ)
Is it true that food spoils faster in No Frost?
Not really. The air in No Frost refrigerators is drier, so unpackaged food can actually go bad faster. However, the temperature in them is distributed more evenly, which prevents local hypothermia. If you store food in containers or film, the shelf life will be comparable to drip models.
Do you need to defrost a Low Frost refrigerator?
Yes, Low Frost and Smart Frost technologies only reduce the rate of ice formation. They cannot completely exclude its occurrence. Once a year or a year and a half (when the ice layer reaches 3-5 mm), the refrigerator will still have to be defrosted manually to maintain energy efficiency.
Why does the No Frost refrigerator hum loudly?
The main source of noise in such models is the fan circulating air. If the humming becomes too loud, there may be ice frozen on the blades due to a defrost malfunction, or the fan may need lubrication/replacement. The compressor itself can also make noise if it operates in high mode.
Is it possible to place a No Frost refrigerator close to the wall?
No, this rule is relevant for all types of refrigerators. To remove heat from the condenser (radiator), a gap of at least 5-10 cm is required from the back and side walls. Violation of this rule will lead to overheating of the compressor and increased energy consumption.