America exposes old refrigerators along the roads. Of course, this is not about Harlem. Rather, it concerns small cottage towns, where the well-to-do stratum of the population lives. Refrigerators are quite working, just the owner decided to update the set of household appliances at home, put unnecessary things on the highway. It is considered in the order of things to come, pick up your favorite thing, or it will be done by the waste management service next morning. An unimaginable standard of living allows Americans to stop thinking why ice freezes in the refrigerator, despite the presence of the NoFrost system, just to get rid of, throwing out the old trash.
The scheme of the refrigerator
The refrigerator lives by the circulation of freon injected by the compressor into the condenser. Under high pressure, the refrigerant becomes liquid, gives off heat to the kitchen air. Having passed in the evaporator, freon takes away heat of internal space of the refrigerator by the evaporator. The refrigerant becomes gas, again rushes to the compressor. The cycle is carried out continuously, the difference between the refrigerators shows how to use the fundamental principle in the work.
There are models:
- With one, two compressors.
- Two, single-circuit systems (we mean the freon circulation path).
- With static, dynamic (forced) cooling.
Today we are going to consider the second branch of the last group, for completeness we will describe other variations along the way so that the speech is clearer. The most impatient readers can immediately move on to the next subtitle, which tells about the NoFrost system.
One vs two compressors
So... There are usually two compartments in the refrigerator, separated from one another tightly (systems considered today violate this principle). Each has its own temperature, optimal food storage:
- refrigerator compartment 4 - 5 ºС;
- freezer -18 - -20 ºС.
Must notice, the parameters are chosen for a reason. Temperature requires the use of regulatory documents of the state for food of various kinds. The defrosting of frozen semi-finished products is carried out at a temperature of about 5 ° C, which is very convenient, since at the same reading of the thermometer it is supposed to store most of the food.
Modern refrigerators offer a choice of usually some range of values, the owner of the device is free to find the right ones. Some models have fresh areas. Maintained temperature close to the freezing point of water. Allows a few days to keep almost any product pristine, without losing quality.
One of the circuit implementations of the refrigerator is the presence of two compressors. Each works by cooling the compartment. Naturally, the motion contours of freon two. Usually the evaporator is located right behind the back wall, there will be the coldest place. Gradually, due to the natural circulation of air, the temperature decreases. The process is called static cooling, ice usually accumulates on the back walls, and periodically it is necessary to clear it. Usually it is necessary to carry out the defrosting procedure.
But! The procedure is carried out for the freezer. In the refrigerating chamber, condensate forms on the back wall (evaporator area), it does not turn into ice. Drops gradually flows down, passing the drainage channel, in a special bowl, standing under the refrigerator. The freezer is free of frost in a similar way. Cooling is turned off, the temperature gradually rises, water flows down the drain, is collected by a rag manually. No problem.
Trouble starts when the drainage tube at the bottom clogs, water begins to collect in the pan, the first sign: it's time to start cleaning. Ice is not formed, just get a small flood. Cleaning the drain is allowed to lead a thick fishing line (1 mm or more), similar material unable to damage the drainage path.
This is how refrigerators work, equipped with two compressors.
Two circuit vs one
Refrigerators with a single compressor function in a similar way. One compartment of freon movement is created for each compartment. Evaporators are right behind the back wall. Therefore, frost is constantly forming in those areas, this is normal. It happens on the wall of the refrigerator ice freezes. This means that the temperature set by the host is too low. A suitable option: the thermostat has broken, it becomes noticeable by strong deviations of the operating parameters from the given ones.
The operation of the equipment is characterized by cyclicality, and the frost slowly melts when the compressor is turned off. Modes are calculated, ice is not formed in the back wall of the refrigerator. In the absence of the NoFrost system, the maximum that can be disturbed is the water of the pallet. Fact means: it's time to clear the drain. Just clogged, making it difficult to drain.
The freezer, of course, will sometimes have to be thawed. The essential attributes of static cooling. It does not matter, two in the refrigerator compressor or just one.
NoFrost refrigerators
According to another principle, NoFrost works. The creators in advance wanted frost, ice in the compartments were not formed. We have to clean the humidity. Achieved by the fact that the evaporator is placed in a special compartment, invisible to the user's eyes. Hiding in the space between the walls. To enhance air circulation through the hidden compartment, a special fan is used. The stream enters from one side, exits from the other, bypassing the ventilation holes.
Moisture settles on the cold evaporator, therefore, the walls of the chambers remain clean. To defeat the frost covering the evaporator, a thawing unit is built in from special heating elements. Due to the good thermal insulation of the hidden compartment, the temperature of the chambers remains unchanged. Down the water flows through a special drainage path, often symbolically separated from the path of frosty air.
This scheme makes the products lightning dry in the refrigerators NoFrost, take the trouble to wrap your meals in bags, packaged in containers. As for the freezer, semi-finished products remain pristine, since the frost has ceased to form. Products do not freeze to each other.
However, for this convenience sometimes you have to pay. The refrigerator is covered with ice. This occurs at the bottom of the drainage. Let's take a closer look at the mechanism itself.
Why does ice form in the fridge with noFrost
Why does ice form in the NoFrost fridge? In other models, the effect is absent (in the refrigerator).
The point is the location of the evaporator, blowing. Depending on the scheme, it looks like this:
- The freezer is located at the top, the freezer is at the bottom. A hidden compartment is embedded between them. In the refrigerating chamber, air is drawn from above, the evaporator passes (leaving frost), is driven by the fan behind the rear wall, enters inside from below, near the sump.
- Each compartment has its own evaporator. Drain maze two. The solution is safer. Practice shows: the solution is not perfect. We return at the end of the review.
Now look what happens in the NoFrost refrigerator with one central evaporator. First, the flows from both compartments are mixed at one point - where frost settles. Therefore, the smells of the freezer and refrigerator compartment mix. Separate inconvenience. The temperature is governed by the amount of air flow. For the freezer, the value is larger, despite the smaller volume of the compartment.
When defrosting, heating is activated. The frost of the evaporator becomes moisture, flowing down the same path (or side by side) along which air flows. The special relief of the tract will ensure reliable flow of fluid into the container under the refrigerator. The process goes well until slaughter happens. Somewhere below. After moisture is collected near the drain hole, hidden from the user's eyes of the refrigerator. Then the cooling cycle starts. Frosty air begins to flow along the path, the moisture immediately freezes, turning into an ice block.
The process is on the rise, with the next cycle the water is poured into the lower refrigerating compartment through the vents. Moisture can accumulate behind the wall, causing an avalanche-like process of ice accumulation. Finally, there is ice in the tray inside the refrigerator, in the back of the chamber on the wall of the refrigerator there is ice, inside the wall space there is a cavity filled with ice.
Treated trouble is simple. Take the trouble to defrost the fridge by unplugging it from the outlet (remove food). Then clean the drainage.
Noticing this problem, manufacturers began to produce refrigerators Low Frost (Frost Free). A branch of the forced blowing is used for the freezer. The refrigerator compartment is defrosted by the drip method (see the beginning of the review). Eliminates the question of why ice is on the wall of the refrigerator.
