What is Frost? This qualitative growth!
In the modern market of domestic refrigeration equipment, there are fewer models of refrigerators and freezers that require manual defrosting. Currently, this category can be attributed only a small single-chamber refrigerators of domestic production, as well as a certain number of freezers of different brands. Basically, if you are going to buy a two - or three-chamber refrigerator medium and large volume (namely such models, according to the results of studies that are most in demand), you will encounter such terms as "automatic defrost», «No Frost», «Frost Free”. In this regard, let us try to understand the working principles of modern refrigerators and identify the advantages and limitations of each type of defrost.
All probably know what to do without defrosting impossible: the compressor and cooling systems in the fridge implies the possibility of formation on the inner walls of both the refrigeration and freezer snow plaque or frost. This problem manufacturers solve several ways. As mentioned above, for freezers manual defrost occurs now very rare, they attivita automatically "drip" or "windy» type freezer — only "windy» or manually.
Drip type thawing is used in most modern refrigerators. In models equipped with this type, on the rear wall of the refrigerating chamber is located the evaporator (sometimes to save space built inside back wall, and then he called "recessed evaporator»). The function of the evaporator — the cooling of the rear wall of the refrigerator, to the formation of a layer of frost (ice) was only on it. When the compressor stops, the ice begin to melt, and the moisture on special guide grooves flows down the drain, and then — in a special container (tray) which is located above the compressor. The temperature of the compressor is quite high, which ensures evaporation of the resulting moisture. The cycle ends, and everything is repeated again. The process of thawing is carried out gradually, imperceptibly to the user of the refrigerator, which can only be noticed at what stage of defrost cycle is currently refrigerator — this is evidenced by the back wall, namely, frozen or covered with drops of water. The frequency and duration of thawing cycles depend on the installation handle thermostat (temperature in the refrigerating chamber), the degree of congestion of the refrigerator, ambient temperature.
Windy type thawing, usually referred to as the system No Frost. Refrigerators equipped with No Frost, evaporator made from the cooling chamber and hidden in the body behind the rear wall of the refrigerator or above the freezer. When this refrigerator is additionally equipped with one or more fans to provide a constant circulation of cold air inside the chambers. The fan blows the evaporator, the air is cooled and blows the camera doing there on special vozduhovodnom channels. Produced by the refrigerator, the moisture does not freeze on the walls with a layer of frost, and "settle" in a cold area — the evaporator. The compressor intermittently disconnects and frost, which he by that time covered cancelled due to a small heater, after which the resulting moisture evaporates again. System No Frost can be equipped with a refrigeration and freezers, whereas drip type ottaways only cooling chamber.
With any type of automatic defrosting, of course, much time is saved users fridge. No defrosting, of course, can not do: no matter how modern your refrigerator, it is recommended that 1—2 times per year to conduct routine cleaning of the inner surface of the refrigerator when it is disconnected, but, of course, be cleaned off, as a decade ago, 10-inch "snow" using a knife and ruler won't have to.
So what model to choose, what are the advantages and disadvantages No Frost compared to refrigerators drip type?
In the materials on this issue, expressed the following opinion on the merits No Frost:
- • More uniform distribution of cold air and, consequently, the temperature throughout the volume of refrigerating (freezing) of the camera.
- • faster recovery temperature in the camera after downloading inside a large party products or simply repeated door opening (positively affects the quality of cooling and preserving food, saves electricity).
Both the first and the second opinion confirmed by the results of special test log "Demand": indeed, the difference in the temperature inside the refrigerating chamber, equipped with a system No Frost, does not exceed 1—2 C, whereas in the fridge drip type it can reach 5—6 degrees (+2 on the lower shelves to +8 on the top). Even more significant temperature difference is observed in freezers no Frost (up to 7—9 degrees unlike 1—2 when there is No Frost).
as for faster temperature recovery after door openings, here, in addition to No Frost plays the role of the power of the refrigerator is determined by the number of compressors and the quality of insulation of the walls of the refrigerator, which every year becomes more and more perfect. At the same time, some experts have expressed the opinion that the refrigerators without No Frost longer retain the temperature during an emergency power outage due to the absence of vostokovednyh channels through which leakage of cold air.
one of the disadvantages of No Frost called:
- • Reduced the level of humidity in the chambers due to the constant forced air circulation and, consequently, faster “drying” products.
- • Reduced volume of the refrigerating chamber due to the appearance of additional equipment (calculated, for example, that No Frost "takes" not less than 20 l from the net volume freezer).
- • Increased level of noise during operation (simultaneous operation of the compressor and fan, plus a constant movement of air masses).
- • Increased energy consumption during operation of the refrigerator.
- • higher cost of a refrigerator, due to the more complex design of the refrigerator and additional equipment (such as fans).
Opinion about faster “drying” products in refrigeration system No Frost, in our opinion, should not be the determining: prerequisites for faster “drying” products really are, but only if their storage is not adhered to the rules of packaging products. Conducted by experts of the magazine ’Demand studies have shown, for example, that the leaves of green salad in the fridge both types begin to fade on the second day, if they are not wrapped in a damp cloth. The same applies to the conditions of storage of cheeses, meats, dairy products, fruits and vegetables. Almost the same moisture loss marked and special studies on the ‘test packages.
Confirmed data about the higher noise coolers with No Frost: so, if the standard refrigerator operates on average at 42 dB, the noise level of refrigerators and air No Frost, averages 45—47 dB. However, some manufacturers (e.g., Siemens) using fans improved design ("slow"), in this case, the noise level does not exceed the average in the class.
No Frost Refrigerators with really slightly more expensive than their "drip" brethren, furthermore, the presence of a large number of additional elements increases the likelihood of product failure due to breakage of one of the elements of its design. However, the equipment of refrigerator system No Frost increases its class, and the model with No Frost, usually positioned by the manufacturer as being of secondary and higher price category, which increases the likelihood of the use of improved technologies and the availability of additional functions.
it Should be noted that in some refrigerators found the combination of "crying" evaporator in the refrigerating chamber fan, and — in the freezer. This combination is quite attractive from the point of view of a comprehensive solution to the problem, especially along with the use of most manufacturers of modern refrigeration technology. These include, for example, multithreaded system air supply (Multi-Flow, Multi Air Flow, Super X-Flow, and so on), cooling system doors, the presence of supercooling mode, etc. As required if the condition is for you equipment refrigerator No Frost, decide for yourself — now you are fully prepared.