Refrigerator Structure and Working Principle
Classic Refrigerator Structure;
The working principle of all coolers is the same as in domestic refrigerators. Ekovat absorbs gaseous refrigerant from the cooler. At the same time, it presses the gas into the condenser. The temperature and pressure of the gas increase. The temperature of the gas is taken by the condenser and the gas liquefies. By filtering the liquefied gas, it absorbs moisture and acids, and keeps dust and similar solids. The cleaned liquid refrigerant reaches the cooler via the capillary. Since the volume suddenly expands in the cooler and it is vacuum, the pressure of the gas decreases. At low pressure, the refrigerant turns from liquid to gas, and in the meantime it takes the heat around it. Removing the heat of the cooler means that this place is cooled.
The gas evaporated in the evap (cooler) is absorbed by the ekovat and presses the condenser and the event is repeated. The heat taken from the cooler is discharged from the condenser. In the cabinet, the cold air in the cooler sinks to the bottom, the warm air below rises and is cooled by the cooler, thus cooling the cabinet volume.
Ekovat: The motor and pump groups of the devices used to cool a certain area such as air conditioners, refrigerators, deep freezers, cold storages are called ekovat. It is the most basic building block of cooling devices.
Classical Refrigerator Working Principle;
In addition to the previous ekovat circuit, there is a thermostat connected in series with the ecowat and a button and a lamp connected in parallel to this main circuit. In this circuit, the relay activates and deactivates the auxiliary winding.
It protects thermal, relay and motor windings against excessive currents. The thermostat stops and restarts the coldness of the cabinet at the set degree. The lamp button is connected to the movement of the cabinet door, and when the cabinet door is opened, its contacts are closed and the lighting lamp turns on. When the cabinet door is closed, it opens the contacts and turns the lamp off.
Working Principle of Deep Freezer Refrigerator;
The difference from the single-door cabinet is that some of them are oil-cooled condenser and have two coolers. The coolers are connected in series with each other. Ekovat absorbs the gas from the cooler, then first presses it to the first condenser.
The gas turns into liquid by removing the heat from the condenser. Since the outlet of the first condenser is connected to the pipe at the bottom of the ecowat, the liquid refrigerant absorbs the heat of the ekovat oil and evaporates again as it passes through the bottom of the ekovat. From the second condenser, the gas gets rid of this heat and turns into a liquid again.
The gas passes through the drier and capillary and evaporates in the coolers and takes the heat around it. The refrigerant in the vapor state is absorbed by the ekovat and presses the condenser again, and the cooling cycle is repeated.
Features of Deep Freezer Refrigerator;
Unlike the single-door cabinet, there is an intermediate compartment heater and a lower cooler (evap) heater in the electrical circuit. Since the motors of the two-door cabinets will be larger than the single-door cabinet motors, the power of the relay and thermal on the motor is also great.
Since the freezer temperature is low (-5 to -25 0C), the temperature decreases accordingly in the intermediate compartment. The moisture in the air condenses in the hair profile, which is the intermediate partition, and sweats. This sweating phenomenon is prevented by placing a heater. The heater is connected in parallel to the circuit. In most double-door cabinets, this heater is replaced by a pipe with one end connected to the pressure end of the ekovat and the other end to the inlet end of the condenser.
While the gas is cooled, the intermediate chamber is also heated. It is activated when Ekovat stops. Ekovata is connected in series to other circuits in parallel.
When Ekovat operates, the thermostat contacts are closed and the current is in the short circuit state of the heater tips. Since the current will follow the short path, it does not pass over the heater and runs over the thermostat, running the ekovat. When the cabinet gets cold, the thermostat contacts open. In this case, the current completes its circuit through the thermal, the main winding of the motor and the relay, respectively. The heater melts the bottom evap (cooler) frost. When the thermostat closes its contacts, cooling starts again and the heater turns off.
No Frost Refrigerator
In no frost refrigerators, each of the circuit elements of the gas and compressor cooling system is available. The only difference is that there are heating resistances on the evaporator surface and a time relay that activates and deactivates these resistances.
No-Frost Refrigerator Structure
The gas cycle of No-Frost cabinets is like other cabinets. With Ekovat, the gas is circulated over the condenser, drier, cooler and cooling is provided. However, the cooler, the hidden and the coldness are distributed to the upper and lower sections by means of a fan motor. Since the upper part of the cabinet is small and the blown air is high, this is the freezer section. The desired coldness is achieved by adjusting the blown air by adjusting the damper at the bottom.
No-Frost Refrigerator Working Principle
The defrosting feature of No-Frost refrigerators works by heating the cooling elements from time to time and melting the ice and evaporating it on the compressor.
The 1st arm current completes its circuit via thermostat, ekovat and timer. The timer stops the ekovat at certain times and activates the heater. The 2nd arm current is divided into two again from the button. It depends on the movement of the door. When the door is opened, it cuts off the current of the fan. The reason is to reduce the cold air coming out of the cabinet. When the door is opened, it energizes the lamp that illuminates the cabinet. The third branch current completes the heater circuit via the timer. When the timer is stopped, the heater is energized and the snow in the cooler (evap) is melted. In this way, snow and icing on the cabinets are prevented.
Note: Connection diagrams are different in various models of each brand. The connections of the cabinets with unknown connection ends should be made according to the diagram by obtaining the connection diagram of that cabinet.
No-Frost Refrigerator Features
No-Frost refrigerators differ from other static cabinets with their working system. In normal refrigerators, when the door is opened in the freezer section, the moisture entering the refrigerator and the humidity of the food cause ice to form in the freezer section. In order to melt the snow and ice formed at certain time intervals, it is necessary to perform operations such as stopping the refrigerator, removing the foods that need to be kept cold during this process, and cleaning the accumulated ice.
In No-Frost cabinets, the situation is completely different. With the help of the fan, dry and cold air is blown homogeneously to the cooler and freezer sections from many points. Thanks to the cold air dispersed homogeneously even between the shelves, it ensures that all your food is cooled evenly and properly, and it does not allow moisture and ice to form. For this reason, your mechanical No-Frost refrigerator provides you with a great ease of use as well as its large volume and aesthetic appearance.